International Journal of Sediment Research最新文献_第2页

Sediment deposition in an upwelling rocky-reef in southwest Atlantic Ocean 西南大西洋上升流岩礁沉积物沉积

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.06.009

Layla Poubel Tunala , Frederico Tapajós de Souza Tâmega , Ricardo Coutinho

Sediment is highly related to coral reef degradation worldwide, and sedimentation is considered a critical cause of stress for coral communities. The current study focused on the Arraial do Cabo Marine Extractive Reserve (ACMER), recognized as a coralline oasis in the southwest Atlantic, which is facing multiple environmental pressures. Among them, mass tourism stands out, which enhances sedimentation. To address the scientific question of how sediment characteristics and rates vary across different sites, local sedimentation was monitored for about one year through sedimentation rates, granulometric composition, and the percentage of calcium carbonate (%CaCO₃) at five sampling sites, each exposed to varying levels of natural and anthropogenic activities. The results revealed distinct patterns linked to these activities and natural agents. For instance, Forno's Cove exhibited the highest percentage of fine sediment (about 70%) among all the other sampled points, suggesting the sedimentation to be strongly related to anthropogenic action. Although the overall sedimentation rates in Arraial do Cabo Bay were not high, the current findings highlight the sedimentation related to the increase in tourist activities and the need for continuous monitoring of ACMER. Such vigilance is crucial for ensuring the environmental health of coral environments and supporting the local human community's livelihoods.

沉积物与世界范围内的珊瑚礁退化密切相关，沉积被认为是珊瑚群落压力的关键原因。目前的研究集中在Arraial do Cabo海洋开采保护区（ACMER），这是大西洋西南部公认的珊瑚绿洲，面临着多重环境压力。其中，大众旅游尤为突出，它促进了沉积。为了解决沉积物特征和速率在不同地点如何变化的科学问题，在五个采样点通过沉降速率、颗粒组成和碳酸钙百分比（%CaCO3）对当地沉积进行了大约一年的监测，每个采样点都暴露于不同程度的自然和人为活动中。结果揭示了与这些活动和自然因素有关的独特模式。例如，在所有其他采样点中，Forno's Cove显示出最高的细沉积物百分比（约70%），这表明沉积与人类活动密切相关。虽然Arraial do Cabo湾的总体沉积速率并不高，但目前的研究结果强调了与旅游活动增加有关的沉积，以及对ACMER进行持续监测的必要性。这种警惕对于确保珊瑚环境的环境健康和支持当地人类社区的生计至关重要。

{"title":"Sediment deposition in an upwelling rocky-reef in southwest Atlantic Ocean","authors":"Layla Poubel Tunala , Frederico Tapajós de Souza Tâmega , Ricardo Coutinho","doi":"10.1016/j.ijsrc.2025.06.009","DOIUrl":"10.1016/j.ijsrc.2025.06.009","url":null,"abstract":"<div><div>Sediment is highly related to coral reef degradation worldwide, and sedimentation is considered a critical cause of stress for coral communities. The current study focused on the Arraial do Cabo Marine Extractive Reserve (ACMER), recognized as a coralline oasis in the southwest Atlantic, which is facing multiple environmental pressures. Among them, mass tourism stands out, which enhances sedimentation. To address the scientific question of how sediment characteristics and rates vary across different sites, local sedimentation was monitored for about one year through sedimentation rates, granulometric composition, and the percentage of calcium carbonate (%CaCO<sub>3</sub>) at five sampling sites, each exposed to varying levels of natural and anthropogenic activities. The results revealed distinct patterns linked to these activities and natural agents. For instance, Forno's Cove exhibited the highest percentage of fine sediment (about 70%) among all the other sampled points, suggesting the sedimentation to be strongly related to anthropogenic action. Although the overall sedimentation rates in Arraial do Cabo Bay were not high, the current findings highlight the sedimentation related to the increase in tourist activities and the need for continuous monitoring of ACMER. Such vigilance is crucial for ensuring the environmental health of coral environments and supporting the local human community's livelihoods.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 710-717"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem cover under laboratory simulation 室内模拟植被茎盖高表面粗糙度流深与水力参数的关系

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.06.004

Hongli Mu , Yifan Zhuo , Yanjuan Wu , Suhua Fu , Kai Zhang , Sangar Khan , Naicheng Wu

Grass, shrubs and tree stems can increase flow depth and resistance and prevent soil erosion, and it is necessary to quantify the relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem. Therefore, the experimental design included flow depth, velocity and transport capacity, which were measured for different stem covers (bare flume to cover 30%), diameters (2, 10, and 36 mm), and arrangements (bead, tessellation, stagger, random, and stripe) to clarify the relationship between flow depth and the hydraulic radius, Reynolds number Re, Manning coefficient n_m, Darcy-Weisbach resistance f and transport capacity Tc. The result shows that flow depth could be effectively predicted by stem cover and stem diameter; the greater the surface roughness was, the more the difference between flow depth and hydraulic radius; and flow depth could not be used as the hydraulic radius to calculate hydraulic parameters for high surface roughness. Re, n_m, and f were significantly impacted by flow depth. The linear relationship between flow depth and Re, n_m, and f became stronger as stem cover decreased and stem diameter increased, and they were more affected by stem cover than by diameter. The relationship between flow depth and f was less impacted by high surface roughness of vegetation stem. Tc was not significantly impacted by flow depth; the Manning coefficient and Darcy-Weisbach resistance were not appropriate for predicting transport capacity; and the Reynolds number could illustrate the mechanism of sediment transport capacity affected by vegetation stem cover from the perspective of flow resistance.

草、灌木、乔木茎可以增加水流深度和阻力，防止土壤侵蚀，植被茎表面粗糙度高，有必要量化水流深度与水力参数的关系。因此，实验设计包括流深、流速和输运能力，分别对不同的干盖（裸水槽覆盖30%）、直径（2、10和36 mm）和布置（头形、嵌格、交错、随机和条形）进行测量，以阐明流深与水力半径、雷诺数Re、曼宁系数nm、达西-韦斯巴赫阻力f和输运能力Tc的关系。结果表明：阀盖和阀杆直径可以有效地预测流深；表面粗糙度越大，流动深度与水力半径之差越大；在高表面粗糙度条件下，不能用流深作为水力半径计算水力参数。Re、nm和f受流动深度影响显著。随着阀盖的减小和阀径的增大，流深与Re、nm、f之间的线性关系越强，且阀盖对它们的影响大于阀径。流深与f的关系受植被茎秆表面粗糙度的影响较小。流动深度对Tc的影响不显著；Manning系数和Darcy-Weisbach阻力不适合预测运输能力；雷诺数可以从流阻的角度说明植被覆盖对输沙能力的影响机制。

{"title":"The relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem cover under laboratory simulation","authors":"Hongli Mu , Yifan Zhuo , Yanjuan Wu , Suhua Fu , Kai Zhang , Sangar Khan , Naicheng Wu","doi":"10.1016/j.ijsrc.2025.06.004","DOIUrl":"10.1016/j.ijsrc.2025.06.004","url":null,"abstract":"<div><div>Grass, shrubs and tree stems can increase flow depth and resistance and prevent soil erosion, and it is necessary to quantify the relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem. Therefore, the experimental design included flow depth, velocity and transport capacity, which were measured for different stem covers (bare flume to cover 30%), diameters (2, 10, and 36 mm), and arrangements (bead, tessellation, stagger, random, and stripe) to clarify the relationship between flow depth and the hydraulic radius, Reynolds number <em>Re</em>, Manning coefficient <em>n</em><sub><em>m</em></sub>, Darcy-Weisbach resistance <em>f</em> and transport capacity <em>Tc</em>. The result shows that flow depth could be effectively predicted by stem cover and stem diameter; the greater the surface roughness was, the more the difference between flow depth and hydraulic radius; and flow depth could not be used as the hydraulic radius to calculate hydraulic parameters for high surface roughness. <em>Re</em>, <em>n</em><sub><em>m</em></sub>, and <em>f</em> were significantly impacted by flow depth. The linear relationship between flow depth and <em>Re</em>, <em>n</em><sub><em>m</em></sub>, and <em>f</em> became stronger as stem cover decreased and stem diameter increased, and they were more affected by stem cover than by diameter. The relationship between flow depth and <em>f</em> was less impacted by high surface roughness of vegetation stem. <em>Tc</em> was not significantly impacted by flow depth; the Manning coefficient and Darcy-Weisbach resistance were not appropriate for predicting transport capacity; and the Reynolds number could illustrate the mechanism of sediment transport capacity affected by vegetation stem cover from the perspective of flow resistance.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 817-828"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of propeller clearance on the jet scour process in restricted water 螺旋桨间隙对受限水中射流冲刷过程的影响

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.06.001

Wei Huang , Shouqian Li , Yongjun Lu , Canhua Zhou , Dewei Mu , Xingnian Liu

Rapid development of inland waterways and marine transportation has resulted in the construction of large ships and an increase in ship speed. Consequently, severe local scour erosion of restricted water beds occurs due to propellers, endangering the surrounding buildings and navigating in the scour area. Thus, investigating bed scouring caused by propeller jets for water-related structures and maintaining navigational safety in restricted waterways is highly important. Therefore, this work combines propeller jet wash flume experiments and dimensionless analysis to investigate the evolution of the three-dimensional (3D) morphology of bed scour with varying clearance heights and the use of noncohesive sediments. The temporal evolution of jet scouring was manifested mainly as the development of the scour area's length, depth, and width, and the entire scouring process could be divided into initial, development, and equilibrium stages. The initial stage occupied more than 60% of the scouring process, and the shape of the center profile of the scour area can be expressed by a third-order function. By analyzing the scour depth variation with time, this study proposed a logarithmic equation for the temporal development process of the maximum scour depth in the scour region, which was used to predict the variation in the maximum propeller depth on the surface of the noncohesive sand bed with time.

内河航运和海洋运输的迅速发展，导致了大型船舶的建造和船舶速度的提高。因此，由于螺旋桨的作用，限制水床会发生严重的局部冲刷，危及冲刷区域内的周围建筑物和航行。因此，研究与水有关的构筑物螺旋桨射流对河床冲刷的影响，维护受限航道的航行安全具有重要意义。因此，本研究将螺旋桨射流洗水槽实验和无量纲分析相结合，研究了不同间隙高度和使用非粘性沉积物时河床冲刷物三维形态的演变。射流冲刷的时间演化主要表现为冲刷区长度、深度和宽度的发展，整个冲刷过程可分为初始阶段、发展阶段和平衡阶段。初始阶段占冲刷过程的60%以上，冲刷区域中心轮廓的形状可以用三阶函数表示。通过分析冲刷深度随时间的变化，提出了冲刷区最大冲刷深度的时间发展过程的对数方程，用于预测非粘性砂床表面最大螺旋桨深度随时间的变化。

{"title":"Influence of propeller clearance on the jet scour process in restricted water","authors":"Wei Huang , Shouqian Li , Yongjun Lu , Canhua Zhou , Dewei Mu , Xingnian Liu","doi":"10.1016/j.ijsrc.2025.06.001","DOIUrl":"10.1016/j.ijsrc.2025.06.001","url":null,"abstract":"<div><div>Rapid development of inland waterways and marine transportation has resulted in the construction of large ships and an increase in ship speed. Consequently, severe local scour erosion of restricted water beds occurs due to propellers, endangering the surrounding buildings and navigating in the scour area. Thus, investigating bed scouring caused by propeller jets for water-related structures and maintaining navigational safety in restricted waterways is highly important. Therefore, this work combines propeller jet wash flume experiments and dimensionless analysis to investigate the evolution of the three-dimensional (3D) morphology of bed scour with varying clearance heights and the use of noncohesive sediments. The temporal evolution of jet scouring was manifested mainly as the development of the scour area's length, depth, and width, and the entire scouring process could be divided into initial, development, and equilibrium stages. The initial stage occupied more than 60% of the scouring process, and the shape of the center profile of the scour area can be expressed by a third-order function. By analyzing the scour depth variation with time, this study proposed a logarithmic equation for the temporal development process of the maximum scour depth in the scour region, which was used to predict the variation in the maximum propeller depth on the surface of the noncohesive sand bed with time.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 729-741"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of three plant root systems on rill erosion characteristics on coal dump slopes under simulated experiments 模拟试验下三种植物根系对排土场边坡细沟侵蚀特性的影响

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.05.005

Yanan Zhu , Yibao Lou , Wenlong Wang , Jiangle Liu , Mingming Guo , Hongliang Kang , Lanqian Feng , Ruidong Li

Dump slopes have experienced severe rill erosion and threaten the safety of the ecological environment. Although vegetation restoration has improved the ecological environments of mining areas, because dump slopes have unique soil properties, the mechanism by which roots impact rill erosion on dump slopes remains unclear. Based on the in-situ runoff scouring experiment of the dump slope and the use of bare land as the control (CK), the influence of roots on rill erosion characteristics (RECs) of the dump slopes were analyzed for three root types of vegetation, specifically, tap root–Artemisia ordosica (AO), fibrous root–Elymus dahuricus (ED) and tap + fibrous root–Artemisia ordosica + Elymus dahuricus (AE). The results indicated that, compared to the CK, the roots reduced the rill erosion rate (T_s) by 75.61%–86.64% and the rill depth (R_d) by 64.62%–81.06% on the dump slopes. However, they increased the runoff depth (h) and Reynolds number (Re) by 2.02%–37.14% and 36.1%–172.0%. Among them, AO significantly increased Manning roughness coefficient (n), Darcy–Weisbach friction factor (f) and shear stress (τ), whereas ED and AE were most effective in reducing h and T_s, respectively. 59.9% of the RECs of dump slopes were explained by roots and hydraulic characteristics together. Furthermore, PLS-SEM analysis revealed that roots affect hydraulic characteristics by changing surface roughness and runoff friction resistance, ultimately leading to differences in the RECs of dump slopes, which explained 98.5% of the RECs on dump slopes with a 72.2% goodness-of-fit. The above results further enhance the understanding of the role of roots in controlling rill erosion on dump slopes.

排土场边坡发生了严重的细沟侵蚀，威胁着生态环境的安全。虽然植被恢复改善了矿区的生态环境，但由于排土场边坡具有独特的土壤性质，根系对排土场边坡细沟侵蚀的影响机制尚不清楚。以裸地为对照（CK），进行了排土场坡面原位径流冲刷试验，分析了根系对排土场坡面细沟侵蚀特性（RECs）的影响，分别针对3种根系类型的植被，即tap根- ordosica （AO）、纤维根- Elymus dahuricus （ED）和tap +纤维根- ordosia ordosica + Elymus dahuricus （AE）。结果表明：与对照相比，排土场坡道根系减少了沟蚀速率（Ts） 75.61% ~ 86.64%，沟深（Rd） 64.62% ~ 81.06%；径流深度(h)和雷诺数（Re）分别增加了2.02% ~ 37.14%和36.1% ~ 172.0%。其中，AO显著提高了Manning粗糙度系数(n)、Darcy-Weisbach摩擦系数(f)和剪切应力（τ），而ED和AE对h和Ts的降低效果最为显著。排土场边坡59.9%的RECs可以用根系和水力特征共同解释。此外，PLS-SEM分析显示，根系通过改变表面粗糙度和径流摩擦阻力来影响水力特性，最终导致排土场边坡RECs的差异，这解释了排土场边坡98.5%的RECs，拟合优度为72.2%。上述结果进一步加深了对排土场边坡根系在控制细沟侵蚀中的作用的认识。

{"title":"Effects of three plant root systems on rill erosion characteristics on coal dump slopes under simulated experiments","authors":"Yanan Zhu , Yibao Lou , Wenlong Wang , Jiangle Liu , Mingming Guo , Hongliang Kang , Lanqian Feng , Ruidong Li","doi":"10.1016/j.ijsrc.2025.05.005","DOIUrl":"10.1016/j.ijsrc.2025.05.005","url":null,"abstract":"<div><div>Dump slopes have experienced severe rill erosion and threaten the safety of the ecological environment. Although vegetation restoration has improved the ecological environments of mining areas, because dump slopes have unique soil properties, the mechanism by which roots impact rill erosion on dump slopes remains unclear. Based on the in-situ runoff scouring experiment of the dump slope and the use of bare land as the control (<em>CK</em>), the influence of roots on rill erosion characteristics (<em>RECs</em>) of the dump slopes were analyzed for three root types of vegetation, specifically, tap root–<em>Artemisia ordosica</em> (<em>AO</em>), fibrous root–<em>Elymus dahuricus</em> (<em>ED</em>) and tap + fibrous root–<em>Artemisia ordosic</em>a + <em>Elymus dahuricus</em> (<em>AE</em>). The results indicated that, compared to the <em>CK</em>, the roots reduced the rill erosion rate (<em>T</em><sub><em>s</em></sub>) by 75.61%–86.64% and the rill depth (<em>R</em><sub><em>d</em></sub>) by 64.62%–81.06% on the dump slopes. However, they increased the runoff depth (<em>h</em>) and Reynolds number (<em>Re</em>) by 2.02%–37.14% and 36.1%–172.0%. Among them, <em>AO</em> significantly increased Manning roughness coefficient (<em>n</em>), Darcy–Weisbach friction factor (<em>f</em>) and shear stress (<em>τ</em>), whereas <em>ED</em> and <em>AE</em> were most effective in reducing <em>h</em> and <em>T</em><sub><em>s</em></sub>, respectively. 59.9% of the <em>RECs</em> of dump slopes were explained by roots and hydraulic characteristics together. Furthermore, <em>PLS-SEM</em> analysis revealed that roots affect hydraulic characteristics by changing surface roughness and runoff friction resistance, ultimately leading to differences in the <em>RECs</em> of dump slopes, which explained 98.5% of the <em>RECs</em> on dump slopes with a 72.2% goodness-of-fit. The above results further enhance the understanding of the role of roots in controlling rill erosion on dump slopes.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 718-728"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of the solid volume fraction of clay and consolidation on the erodibility of sand-mud mixtures 粘土固体体积分数和固结对砂泥混合物可蚀性的影响

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.06.008

Zhonghao Zhao , Yuan Xu , Xianye Wang , Jianwei Sun , Qing He

The erodibility of sediment mixtures is a key factor in sediment dynamic processes and morphological evolution in coastal environments. However, it remains insufficiently understood. In the current study, the critical shear stress of sediments is analyzed with different mud contents and consolidation degrees from experimental results and previous studies. The results indicate that the critical shear stress increases with clay content, peaking at 30% clay content, and then gradually decreasing. Compared to the solid volume fraction of mud (clay and silt), the solid volume fraction of clay shows a higher relation with the critical shear stress of sand-mud mixtures. The role of the consolidation degree in the erodibility of sediment mixtures was quantified through consolidation experiments, revealing an exponential relation between critical shear stress and consolidation coefficient. An empirical equation for the critical shear stress is proposed to consider the mud content, the solid volume fraction of clay, and the consolidation degree. This equation is applicable to mixed sediment over the full range of mud content and varying consolidation degrees. It has a simple form, is easier to apply, and outperforms other empirical equations (RMSE = 0.62; R² = 0.73).

泥沙混合物的可蚀性是影响海岸环境泥沙动力过程和形态演化的关键因素。然而，人们对它的理解仍然不够充分。本研究结合实验结果和前人研究，分析了不同泥质含量和固结程度下沉积物的临界剪应力。结果表明：随着粘土含量的增加，临界剪应力逐渐增大，在粘土含量为30%时达到峰值，随后逐渐减小；与泥浆（粘土和粉砂）的固体体积分数相比，粘土的固体体积分数与砂泥混合物的临界剪应力的关系更高。通过固结试验量化了固结程度对混合泥沙可蚀性的影响，揭示了临界剪应力与固结系数之间的指数关系。提出了考虑泥浆含量、粘土固体体积分数和固结程度的临界剪应力经验方程。该方程适用于全泥含量范围内不同固结程度的混合泥沙。它有一个简单的形式，更容易应用，并优于其他经验方程（RMSE = 0.62; R2 = 0.73）。

{"title":"Impact of the solid volume fraction of clay and consolidation on the erodibility of sand-mud mixtures","authors":"Zhonghao Zhao , Yuan Xu , Xianye Wang , Jianwei Sun , Qing He","doi":"10.1016/j.ijsrc.2025.06.008","DOIUrl":"10.1016/j.ijsrc.2025.06.008","url":null,"abstract":"<div><div>The erodibility of sediment mixtures is a key factor in sediment dynamic processes and morphological evolution in coastal environments. However, it remains insufficiently understood. In the current study, the critical shear stress of sediments is analyzed with different mud contents and consolidation degrees from experimental results and previous studies. The results indicate that the critical shear stress increases with clay content, peaking at 30% clay content, and then gradually decreasing. Compared to the solid volume fraction of mud (clay and silt), the solid volume fraction of clay shows a higher relation with the critical shear stress of sand-mud mixtures. The role of the consolidation degree in the erodibility of sediment mixtures was quantified through consolidation experiments, revealing an exponential relation between critical shear stress and consolidation coefficient. An empirical equation for the critical shear stress is proposed to consider the mud content, the solid volume fraction of clay, and the consolidation degree. This equation is applicable to mixed sediment over the full range of mud content and varying consolidation degrees. It has a simple form, is easier to apply, and outperforms other empirical equations (RMSE = 0.62; <em>R</em><sup>2</sup> = 0.73).</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 829-839"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visualization analysis of global research on river and lake sediment pollution management based on CiteSpace 基于CiteSpace的全球河湖沉积物污染治理研究可视化分析

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/j.ijsrc.2025.06.003

Yan Wang , Kexin Miao , Jie Wang , Chunhua Li , Chun Ye , Yu Chu

River and lake sediment is a crucial and sensitive area for the interaction between nature and human activities in the Earth's spheres. CiteSpace was applied to analyze the status quo of global river and lake sediment pollution management from 1983 to 2023. New ideas and application technologies for river and lake sediment pollution control were provided by tracking research hotspots and trends. The results indicated that the number of research papers increased rapidly approximately 2,000. Four productive teams were selected whose research focused on (1) the solidification and stabilization of contaminated sediment (team of Tsang, D.C.W., 2017–2020), (2) the adsorption and interception of persistent organic pollution (team of Cornelissen, G., 2008–2017), (3) the remediation of heavy metal pollution by novel nanomaterials (team of Zeng, G., 2016–2019), and (4) the remediation of heavy metal fields by plants (team of Tack, F.M.G., 2000–2005). In addition, interdisciplinary studies in this field are rare. Polychlorinated biphenyls, cadmium, copper, and other pollutants appeared successively, and the foregoing research tracks of pollutants reflect the development of industrial technology and changes in human lifestyles. Research on plant adsorption, microbial community degradation, and chemical fixation has exceeded the description of the physical and chemical properties of sediment pollutants. Since 2015, activated carbon, ecological risk, environmental change, and management have emerged. The current research highlights two new trends, namely, green environmental protection and environmental change, in terms of management risks in the fields of river and lake sediment pollution. This study contributes to an uplink sensing scheme for lake sediment pollution management in the future.

河流和湖泊沉积物是地球圈层中自然与人类活动相互作用的关键和敏感区域。应用CiteSpace软件对1983 - 2023年全球河湖沉积物污染治理现状进行了分析。通过跟踪研究热点和趋势，为河湖沉积物污染控制提供新的思路和应用技术。结果表明，研究论文数量增长迅速，约为2000篇。选择了四个高产团队，其研究重点为：(1)污染沉积物的固化与稳定（Tsang， D.C.W.团队，2017-2020），(2)持久性有机污染的吸附与拦截（Cornelissen， G.团队，2008-2017），(3)新型纳米材料对重金属污染的修复（Zeng， G.团队，2016-2019），(4)植物对重金属场的修复（Tack， F.M.G.团队，2000-2005）。此外，该领域的跨学科研究很少。多氯联苯、镉、铜等污染物相继出现，上述污染物的研究轨迹反映了工业技术的发展和人类生活方式的变化。对植物吸附、微生物群落降解和化学固定的研究已经超出了对沉积物污染物理化性质的描述。2015年以来，活性炭、生态风险、环境变化、管理等问题相继出现。当前研究在河湖底泥污染管理风险方面突出了绿色环保和环境变化两个新趋势。本研究为未来湖泊沉积物污染管理的上行传感方案提供了依据。

{"title":"Visualization analysis of global research on river and lake sediment pollution management based on CiteSpace","authors":"Yan Wang , Kexin Miao , Jie Wang , Chunhua Li , Chun Ye , Yu Chu","doi":"10.1016/j.ijsrc.2025.06.003","DOIUrl":"10.1016/j.ijsrc.2025.06.003","url":null,"abstract":"<div><div>River and lake sediment is a crucial and sensitive area for the interaction between nature and human activities in the Earth's spheres. CiteSpace was applied to analyze the status quo of global river and lake sediment pollution management from 1983 to 2023. New ideas and application technologies for river and lake sediment pollution control were provided by tracking research hotspots and trends. The results indicated that the number of research papers increased rapidly approximately 2,000. Four productive teams were selected whose research focused on (1) the solidification and stabilization of contaminated sediment (team of Tsang, D.C.W., 2017–2020), (2) the adsorption and interception of persistent organic pollution (team of Cornelissen, G., 2008–2017), (3) the remediation of heavy metal pollution by novel nanomaterials (team of Zeng, G., 2016–2019), and (4) the remediation of heavy metal fields by plants (team of Tack, F.M.G., 2000–2005). In addition, interdisciplinary studies in this field are rare. Polychlorinated biphenyls, cadmium, copper, and other pollutants appeared successively, and the foregoing research tracks of pollutants reflect the development of industrial technology and changes in human lifestyles. Research on plant adsorption, microbial community degradation, and chemical fixation has exceeded the description of the physical and chemical properties of sediment pollutants. Since 2015, activated carbon, ecological risk, environmental change, and management have emerged. The current research highlights two new trends, namely, green environmental protection and environmental change, in terms of management risks in the fields of river and lake sediment pollution. This study contributes to an uplink sensing scheme for lake sediment pollution management in the future.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"40 5","pages":"Pages 808-816"},"PeriodicalIF":3.7,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TOC TOC

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-10-01 DOI: 10.1016/S1001-6279(25)00086-1

引用次数: 0

Suspended sediment concentration within submerged vegetation canopies: An improved method 淹没植被冠层内悬浮沉积物浓度：一种改进的方法

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-09-29 DOI: 10.1016/j.ijsrc.2025.09.004

Shanghong Zhang , Hao Jia , Caihong Tang , Yujun Yi , Yinghao Zhang , Qipeng Mou

Aquatic vegetation plays a crucial role in regulating sediment transport and maintaining the stability of aquatic ecosystems. To investigate the turbulence structure and suspended sediment distribution under the influence of natural flexible submerged vegetation, this study selected Vallisneria natans (eelgrass), a representative flexible submerged plant, as the experimental material. Systematic measurements of flow structure and suspended sediment concentration (SSC) were conducted under submerged vegetation conditions. The experimental results demonstrated that the presence of flexible vegetation significantly altered the vertical distribution of flow velocity and turbulence characteristics. Under different vegetation densities, noticeable variations were observed in time-averaged velocity, lateral and vertical Reynolds stresses, and turbulent kinetic energy (TKE), with particularly pronounced changes in the near-bed and canopy regions. Compared to the bare bed condition, SSC in vegetated flows was significantly reduced, and the reduction became more evident with increasing vegetation density. To predict the SSC profiles under flexible vegetation conditions, the vertical distribution of the turbulent diffusion coefficient was calculated. Results showed that the coefficient exhibited a linear distribution within the canopy, reaching a maximum near the canopy top. Based on this distribution pattern, an improved Rouse equation applicable to submerged flexible vegetation conditions was proposed. The modified Rouse model was validated against measured SSC profiles under various vegetation densities and hydraulic conditions, demonstrating its ability to accurately predict the vertical distribution of suspended sediment. This study provides theoretical support for sediment transport modeling, hydrodynamic regulation, and ecological restoration in vegetated riverine and lacustrine environments. It also lays a foundation for advancing the understanding of the coupled interactions among flow, sediment, and vegetation.

水生植被在调节输沙和维持水生生态系统稳定方面起着至关重要的作用。为了研究天然柔性沉水植被影响下的湍流结构和悬沙分布，本研究选择了具有代表性的柔性沉水植物大叶藻（Vallisneria natans, eelgrass）作为实验材料。在淹没植被条件下，系统测量了河流结构和悬沙浓度。实验结果表明，柔性植被的存在显著改变了水流速度和湍流特性的垂直分布。在不同植被密度下，时间平均流速、横向和垂直雷诺兹应力、湍流动能（TKE）均有显著变化，其中近床区和冠层区变化尤为显著。与裸床条件相比，植被流中的SSC显著减少，且随着植被密度的增加减少更为明显。为了预测弹性植被条件下的SSC剖面，计算了湍流扩散系数的垂直分布。结果表明，该系数在冠层内呈线性分布，在冠层顶部附近达到最大值。在此基础上，提出了一种适用于水下柔性植被条件的改进的Rouse方程。修正后的Rouse模型在不同植被密度和水力条件下实测的SSC剖面上进行了验证，证明其能够准确预测悬沙的垂直分布。该研究为植被河湖环境的输沙模拟、水动力调控和生态恢复提供了理论支持。为进一步认识水流、泥沙和植被之间的耦合相互作用奠定了基础。

{"title":"Suspended sediment concentration within submerged vegetation canopies: An improved method","authors":"Shanghong Zhang , Hao Jia , Caihong Tang , Yujun Yi , Yinghao Zhang , Qipeng Mou","doi":"10.1016/j.ijsrc.2025.09.004","DOIUrl":"10.1016/j.ijsrc.2025.09.004","url":null,"abstract":"<div><div>Aquatic vegetation plays a crucial role in regulating sediment transport and maintaining the stability of aquatic ecosystems. To investigate the turbulence structure and suspended sediment distribution under the influence of natural flexible submerged vegetation, this study selected <em>Vallisneria natans</em> (eelgrass), a representative flexible submerged plant, as the experimental material. Systematic measurements of flow structure and suspended sediment concentration (SSC) were conducted under submerged vegetation conditions. The experimental results demonstrated that the presence of flexible vegetation significantly altered the vertical distribution of flow velocity and turbulence characteristics. Under different vegetation densities, noticeable variations were observed in time-averaged velocity, lateral and vertical Reynolds stresses, and turbulent kinetic energy (TKE), with particularly pronounced changes in the near-bed and canopy regions. Compared to the bare bed condition, SSC in vegetated flows was significantly reduced, and the reduction became more evident with increasing vegetation density. To predict the SSC profiles under flexible vegetation conditions, the vertical distribution of the turbulent diffusion coefficient was calculated. Results showed that the coefficient exhibited a linear distribution within the canopy, reaching a maximum near the canopy top. Based on this distribution pattern, an improved Rouse equation applicable to submerged flexible vegetation conditions was proposed. The modified Rouse model was validated against measured SSC profiles under various vegetation densities and hydraulic conditions, demonstrating its ability to accurately predict the vertical distribution of suspended sediment. This study provides theoretical support for sediment transport modeling, hydrodynamic regulation, and ecological restoration in vegetated riverine and lacustrine environments. It also lays a foundation for advancing the understanding of the coupled interactions among flow, sediment, and vegetation.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"41 1","pages":"Pages 135-144"},"PeriodicalIF":3.7,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Why did an ancient basin suddenly experience debris flows outbreak and migration in recent 50 years? 为什么一个古老的盆地在近50年突然经历了泥石流的爆发和迁移？

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-09-25 DOI: 10.1016/j.ijsrc.2025.09.001

Liqun Lyu , Yunqi Wang , Xinyue Liang , Jun Li , Chao Ma , Chengyou Hou , Yu Chen , Feng Huang , Zihan Qi , Mengzhen Xu , Zhaoyin Wang

Tongde Basin, situated on the east edge of Tibetan Plateau, has accumulated substantial deposits of pebble-sand. The uplift of the Tibetan Plateau has initiated incision in the upper reaches of the Yellow River, subsequently causing incision in tributaries like the Daheba River within Tongde Basin. This transitioned Tongde Basin from a sedimentary to an erosional context from 150,000 years ago. However, debris flow gullies began to develop along Daheba River since the 1970s and migrate upstream fast. The relationship between the location, outbreak time, and migration of debris flow gullies was analyzed using dendrogeomorphic dating techniques. The results indicate that the distribution of debris flow gullies is concentrated in the lower reaches of Daheba River, and the frequency of outbreaks is high. The distribution of debris flow gullies in the middle reaches is relatively small, and the frequency of outbreaks is low, but there is an accelerating trend. The distribution characteristics and frequency of debris flows are closely related to the depth of incision of the debris flow gullies and the thickness of the gravel-sand-layer. In the middle and upper reaches of Daheba River, the river incised through the pebble-sand-layer, resulting in exposed bedrock. The slope of the pebble-sand layer is steep but difficult to support large heights. The slope of the bedrock is gentle but can support a large height. Therefore, the gravel-sand sediment layer is prone to instability and continues to provide a source of debris flows under the action of river incision. The migration of debris flow gullies is related to the potential volume changes of unstable pebble-sand layers caused by the river incision.

同德盆地位于青藏高原东部边缘，沉积了大量的卵石砂。青藏高原的隆升导致黄河上游出现切口，进而导致同德盆地内的大河巴河等支流出现切口。这使得同德盆地从15万年前的沉积环境转变为侵蚀环境。然而，自20世纪70年代以来，大河巴河沿岸开始发育泥石流沟，并向上游快速迁移。利用树木地貌测年技术分析了泥石流沟的位置、爆发时间和迁移之间的关系。结果表明：泥石流沟分布集中在大河巴河下游，暴发频率高；中游泥石流沟分布相对较小，暴发频率较低，但有加速的趋势。泥石流的分布特征和频率与泥石流沟的切口深度和砾石砂层厚度密切相关。在大河巴河中上游，河流切割了卵石砂层，露出了基岩。卵石砂层的坡度陡峭，但难以支撑大的高度。基岩的斜坡很平缓，但可以支撑很高的高度。因此，在河流切割作用下，砂砾沉积层易失稳，继续提供泥石流来源。泥石流沟的迁移与河流切割引起的不稳定卵石砂层的潜在体积变化有关。

{"title":"Why did an ancient basin suddenly experience debris flows outbreak and migration in recent 50 years?","authors":"Liqun Lyu , Yunqi Wang , Xinyue Liang , Jun Li , Chao Ma , Chengyou Hou , Yu Chen , Feng Huang , Zihan Qi , Mengzhen Xu , Zhaoyin Wang","doi":"10.1016/j.ijsrc.2025.09.001","DOIUrl":"10.1016/j.ijsrc.2025.09.001","url":null,"abstract":"<div><div>Tongde Basin, situated on the east edge of Tibetan Plateau, has accumulated substantial deposits of pebble-sand. The uplift of the Tibetan Plateau has initiated incision in the upper reaches of the Yellow River, subsequently causing incision in tributaries like the Daheba River within Tongde Basin. This transitioned Tongde Basin from a sedimentary to an erosional context from 150,000 years ago. However, debris flow gullies began to develop along Daheba River since the 1970s and migrate upstream fast. The relationship between the location, outbreak time, and migration of debris flow gullies was analyzed using dendrogeomorphic dating techniques. The results indicate that the distribution of debris flow gullies is concentrated in the lower reaches of Daheba River, and the frequency of outbreaks is high. The distribution of debris flow gullies in the middle reaches is relatively small, and the frequency of outbreaks is low, but there is an accelerating trend. The distribution characteristics and frequency of debris flows are closely related to the depth of incision of the debris flow gullies and the thickness of the gravel-sand-layer. In the middle and upper reaches of Daheba River, the river incised through the pebble-sand-layer, resulting in exposed bedrock. The slope of the pebble-sand layer is steep but difficult to support large heights. The slope of the bedrock is gentle but can support a large height. Therefore, the gravel-sand sediment layer is prone to instability and continues to provide a source of debris flows under the action of river incision. The migration of debris flow gullies is related to the potential volume changes of unstable pebble-sand layers caused by the river incision.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"41 1","pages":"Pages 23-35"},"PeriodicalIF":3.7,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of scour profiles downstream of grade control structures via the shear stress and sediment bed curvature model 利用剪切应力和沉积层曲率模型预测控坡构造下游冲刷剖面

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-09-24 DOI: 10.1016/j.ijsrc.2025.09.002

Amir H. Azimi

A new semianalytical model for the prediction of local scour profiles downstream from typical grade-control structures is proposed on the basis of the variation in bed shear stress and the sediment bed curvature concept. The proposed method was applied to a continuous boundary between the flow and sediment regions to predict the scour profile downstream of submerged sharp-crested weirs. By applying the momentum equation, the nappe flow over the weir was modeled as an oblique point force on the bed surface boundary, and the eroded profile was represented by a system of differential equations. The scour length and sediment resistance strength are the two unknowns in the shear stress and sediment bed curvature (SSC) differential equations. A series of laboratory experiments were carried out under clear water conditions to evaluate the accuracy and performance of the proposed model. The scour profile was calculated via prediction equations that are based on the known maximum scour depth, d_max, which was proposed in this study and in the literature. The effects of the submergence ratio and flow intensity on the maximum scour depth and scour profile were investigated, and a model was developed to predict the equilibrium scour depth. The prediction error associated with equations based on the equilibrium scour depth, d_max, resulted in a significant error in scour length prediction. Furthermore, the deviation between the measured and predicted geometrical characteristics was also correlated with predictions of d_max and scour length, L, as functions of flow intensity and submergence.

基于河床剪应力变化和河床曲率概念，提出了一种预测典型控级构造下游局部冲刷剖面的半解析模型。将该方法应用于流沙连续边界，对淹没尖顶堰下游冲刷剖面进行预测。应用动量方程，将堰上推覆流模型化为床面边界上的斜点力，将冲蚀剖面用微分方程组表示。冲刷长度和抗沙强度是剪切应力和沉积层曲率（SSC）微分方程中的两个未知数。在清水条件下进行了一系列实验室实验，以评估所提出模型的准确性和性能。冲刷剖面是通过基于已知最大冲刷深度的预测方程来计算的，dmax是在本研究和文献中提出的。研究了淹没比和水流强度对最大冲刷深度和冲刷剖面的影响，建立了预测平衡冲刷深度的模型。基于平衡冲刷深度dmax方程的预测误差导致冲刷长度预测误差较大。此外，实测几何特征与预测几何特征之间的偏差也与dmax和冲刷长度L的预测相关，作为水流强度和淹没度的函数。

{"title":"Prediction of scour profiles downstream of grade control structures via the shear stress and sediment bed curvature model","authors":"Amir H. Azimi","doi":"10.1016/j.ijsrc.2025.09.002","DOIUrl":"10.1016/j.ijsrc.2025.09.002","url":null,"abstract":"<div><div>A new semianalytical model for the prediction of local scour profiles downstream from typical grade-control structures is proposed on the basis of the variation in bed shear stress and the sediment bed curvature concept. The proposed method was applied to a continuous boundary between the flow and sediment regions to predict the scour profile downstream of submerged sharp-crested weirs. By applying the momentum equation, the nappe flow over the weir was modeled as an oblique point force on the bed surface boundary, and the eroded profile was represented by a system of differential equations. The scour length and sediment resistance strength are the two unknowns in the shear stress and sediment bed curvature (SSC) differential equations. A series of laboratory experiments were carried out under clear water conditions to evaluate the accuracy and performance of the proposed model. The scour profile was calculated via prediction equations that are based on the known maximum scour depth, <em>d</em><sub>max</sub>, which was proposed in this study and in the literature. The effects of the submergence ratio and flow intensity on the maximum scour depth and scour profile were investigated, and a model was developed to predict the equilibrium scour depth. The prediction error associated with equations based on the equilibrium scour depth, <em>d</em><sub>max</sub>, resulted in a significant error in scour length prediction. Furthermore, the deviation between the measured and predicted geometrical characteristics was also correlated with predictions of <em>d</em><sub>max</sub> and scour length, <em>L</em>, as functions of flow intensity and submergence.</div></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"41 1","pages":"Pages 182-196"},"PeriodicalIF":3.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0