International Journal of Sediment Research最新文献_第9页

Erosive stability channel factor for Brda River (Poland): A key assessment of the human impact of the catchment changes 布尔达河（波兰）侵蚀稳定通道因子：集水区变化对人类影响的关键评估

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-02-01 DOI: 10.1016/j.ijsrc.2024.11.002

Dawid Aleksander Szatten , Oleksandr Obodovskyi , Marta Brzezińska

The stability of river channels results from the impact of spatially diversified natural characteristics of the catchment, which are additionally intensified by the pressure of human activities. The aim of the current study was the overall assessment of the riverbed stability in the Brda River catchment (Poland) in the two periods 1980–1989 and 1991–2018. The study area is characterized by a high discharge regularity, resulting from the river-lake system in the upper part of the catchment, and strong human pressure caused by the presence of hydrotechnical structures in the middle and lower parts of the catchment. The hydrological, sedimentological, and land cover archival data were used in the current study. Also, in the field campaign, the characteristics of the river channel were delimited. Finally, the erosive stability channel factor is proposed, reflecting the level of pressure on the fluvial system from the catchment. The results show that in the first period, there was a tendency to accumulate sediment on the riverbed, resulting in its instability. However, in the second period, the river channel was stable, and erosion and sedimentation processes did not occur. The links between the stability of the bed of the Brda River, and the temporal and area-related pressures made it possible to identify long-term trends in the degradation of the fluvial environment as a result of human activities and to indicate the directions for sustainable sediment management in the catchment.

河道的稳定性是受流域空间多样性自然特征影响的结果，而人类活动的压力又加剧了这种影响。本研究的目的是全面评估1980-1989年和1991-2018年两个时期布尔达河流域（波兰）的河床稳定性。研究区由于流域上部的河湖水系，以及中下游水工结构的存在造成的较大的人为压力，具有较高的流量规律性。本研究利用了水文、沉积和土地覆盖档案资料。同时，在野外运动中，对河道特征进行了划定。最后，提出了反映流域对河流系统压力水平的侵蚀稳定河道因子。结果表明：第一阶段河床有泥沙淤积的趋势，导致河床失稳；而在第二期，河道稳定，没有发生侵蚀和沉积作用。由于布尔达河河床的稳定性与时间和与地区有关的压力之间的联系，有可能确定由于人类活动而导致河流环境退化的长期趋势，并指出集水区可持续沉积物管理的方向。

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引用次数: 0

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IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-02-01 DOI: 10.1016/S1001-6279(24)00135-5

引用次数: 0

Experimental investigation into flow resistance of large benthic crab burrows in the Yellow River Delta, China 黄河三角洲大型底栖蟹洞水流阻力的实验研究

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-02-01 DOI: 10.1016/j.ijsrc.2024.11.003

Wenbo Zhu , Yan Lu , Chengyang Zhou , Yongjun Lu , Pan Wu , Liqin Zuo , Tingjie Huang , Huaiqian Xiao

The current study investigates the impact of burrowing activities by crab species in the tidal flats of the Yellow River Delta in China on the hydraulic resistance characteristics of water flow, particularly the regulatory effect of biological activity on hydraulic parameters. Although there are many models that attempt to describe the resistance to water flow, these models tend to ignore the influence of such things as biological structures, geomorphological features, and artificial constructs in complex natural water bodies, resulting in insufficient predictive accuracy of the resistance coefficients and Manning's roughness coefficients. In this paper, a new theoretical model is developed to achieve the construction of a model for predicting the hydrodynamic resistance characteristics of crab-hole regions affected by water flow by introducing a cross-sectional area correction coefficient to improve the accuracy of the calculation. The experimental results show that there is a significant positive correlation between the drag coefficient, and the hydraulic radius, and cave density, and a negative correlation with the Reynolds number, and the modification for the sidewall and bed effect greatly improves the representativeness of the measured data. In addition, a new theoretical model is proposed to improve the prediction of drag and Manning's roughness coefficient, and the prediction results are in good agreement with the measured data. The improved drag coefficient calculation model proposed in this paper improves the applicability to the research object and helps to establish a more accurate hydrodynamic model.

本研究旨在探讨黄河三角洲潮滩蟹类的挖洞活动对水流水力阻力特性的影响，特别是生物活动对水力参数的调节作用。尽管有许多模型试图描述水流阻力，但这些模型往往忽略了复杂自然水体中生物结构、地貌特征和人工构造等因素的影响，导致阻力系数和曼宁粗糙度系数的预测精度不足。本文建立了一种新的理论模型，通过引入截面积修正系数来提高计算精度，实现了预测受水流影响的蟹孔区水动力阻力特性模型的构建。实验结果表明，阻力系数与水力半径、洞室密度呈显著正相关，与雷诺数呈显著负相关，对侧壁和床层效应的修正大大提高了实测数据的代表性。此外，提出了一种新的理论模型来改进阻力和曼宁粗糙度系数的预测，预测结果与实测数据吻合较好。本文提出的改进阻力系数计算模型提高了对研究对象的适用性，有助于建立更精确的水动力模型。

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引用次数: 0

Flow patterns in shallow rectangular reservoirs with open channel inlet or pipe flow inlet at various depths: An experimental study 不同深度开槽或管流入口浅矩形水库的流动模式：实验研究

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-01-22 DOI: 10.1016/j.ijsrc.2025.01.004

El Mehdi Chagdali , Kamal El Kadi Abderrezzak , Sébastien Erpicum , Cédric Goeury , Matthieu Secher , Benjamin Dewals

This study experimentally assesses the influence of varying the inlet boundary condition on the flow patterns in rectangular shallow reservoirs. Two types of inlet boundary conditions were compared: a free surface inlet channel, and a pressurized circular inlet jet positioned at three different elevations over the flow depth (centroid of the inlet jet situated at 25%, 50%, or 75% of the flow depth). The outlet boundary condition was a free surface channel in all cases. Twenty-two experiments were done with two distinct reservoir lengths (length-to-width ratios of 1.1 and 2.0) and three hydraulic boundary conditions (Froude numbers of 0.14, 0.16, and 0.21). Velocity fields were measured with Large-Scale Particle Image Velocimetry (LSPIV) at the surface, and with an Acoustic Doppler Velocity Profiler (ADVP) at several cross sections. The flow patterns are greatly influenced by the inlet boundary condition and the reservoir geometry, but to a lesser extent by the hydraulic boundary condition. For an inlet circular jet located near the reservoir bottom, an unstable flow type, changing over time in a chaotic manner, was observed regardless of the reservoir length and of the inlet flow rate. The same type of unstable flow pattern was observed for a relatively long reservoir and the lowest tested flow rate, irrespective of the vertical positioning of the inlet jet. In all other tested configurations, a steady reattached jet was found in the reservoir equipped with a pressurized inlet jet. In addition to providing new knowledge on flow patterns in shallow reservoirs with an inlet jet, the experimental data presented here will prove valuable for evaluating flow computational models.

实验研究了不同入口边界条件对矩形浅储层流型的影响。比较了两种类型的进口边界条件：自由表面进口通道和位于流动深度上三个不同高度的加压圆形进口射流（进口射流的质心位于流动深度的25%、50%或75%）。在所有情况下，出口边界条件均为自由面通道。采用两种不同的储层长度（长宽比分别为1.1和2.0）和三种水力边界条件（弗劳德数分别为0.14、0.16和0.21）进行了22次实验。在地表用大尺度粒子图像测速仪（LSPIV）测量速度场，在若干断面用多普勒测速仪（ADVP）测量速度场。进口边界条件和水库几何形状对流型的影响较大，水力边界条件对流型的影响较小。对于靠近储层底部的入口圆形射流，无论储层长度和入口流量如何，都观察到一种随时间混沌变化的不稳定流型。在相对较长的储层和最低测试流量中，无论进口射流的垂直位置如何，都观察到相同类型的不稳定流型。在所有其他测试配置中，在配备加压进口射流的储层中发现了稳定的再附着射流。除了提供关于浅层储层射流流态的新知识外，本文提供的实验数据将证明对流动计算模型的评估是有价值的。

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引用次数: 0

On the parameters of common settling velocity models for porous sediment aggregates 多孔泥沙团聚体常用沉降速度模型参数研究

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-01-21 DOI: 10.1016/j.ijsrc.2025.01.002

Alexander Metelkin , Bernhard Vowinckel

The settling behavior of sediment aggregates is a critical factor influencing the transport of fine-grained sediment in riverine and marine environments. Due to the small size and fragile structure of cohesive sediment aggregates, direct measurement of their porosity and permeability is challenging. While porosity often is estimated using settling velocity relations, permeability is frequently overlooked. The current study examines the impact of considering non-negligible permeability on the properties of flocs. Aggregate properties are compared by calibrating experimental data to two settling models in a dilute regime: one assumes a fractal structure of aggregates and neglects permeability, while the other assumes constant porosity and permeability. The current results demonstrate that both models describe the experimental data of highly porous aggregates with similar accuracy. Aggregate dynamics are further investigated in more complex flow conditions using numerical simulations applying a volume penalization method to geometrically resolve flocs. The behavior of permeable and impermeable flocs is compared in dense suspension regimes and during dilute settling in density-stratified environments. The current findings reveal that permeability significantly influences settling dynamics in complex scenarios and should be considered when determining aggregate properties.

泥沙团聚体的沉降行为是影响细粒泥沙在河流和海洋环境中运移的关键因素。由于粘性沉积物团聚体体积小且结构脆弱，直接测量其孔隙度和渗透率具有挑战性。虽然孔隙度通常使用沉降速度关系来估计，但渗透率经常被忽略。本研究考察了考虑不可忽略的渗透性对絮凝体性能的影响。通过标定实验数据，比较了两种稀释条件下的沉降模型：一种假设集料的分形结构，忽略渗透率，另一种假设孔隙度和渗透率恒定。目前的结果表明，两种模型对高孔隙集料的实验数据的描述精度相似。在更复杂的流动条件下，采用体积惩罚方法进行数值模拟，进一步研究了絮凝体的几何解析。在密集的悬浮液体系和密度分层环境中稀释沉降过程中，比较了渗透和不渗透絮凝体的行为。目前的研究结果表明，在复杂情况下，渗透率对沉降动力学有显著影响，在确定骨料性能时应予以考虑。

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引用次数: 0

Assessment of infiltration and erosion rates in Mediterranean reservoirs’ catchments through rainfall simulation 通过降雨模拟评估地中海水库集水区的入渗和侵蚀速率

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-01-20 DOI: 10.1016/j.ijsrc.2025.01.003

Jorge Mongil-Manso , Carmen Patino-Alonso , José Nespereira-Jato , José-Luis Molina , Fernando Espejo , Teresa Diez-Castro , Santiago Zazo , Fernando Silla

The land use and vegetation type of a reservoir's catchment substantially affect the hydrological processes of soil infiltration and runoff. They also act as drivers or constraints for erosive processes. All the previous processes influence the amount of water and sediment that reach the reservoir and affect its functioning. This study is mainly aimed to improve the knowledge of these processes in southeastern Spain by means of experimental rainfall simulation and multivariate statistical analysis. The results show that the mean infiltration rate is 1.06 times higher in forests than in shrublands and 1.07 times higher than in olive crops (280.52, 265.02, and 262.08 mm/h, respectively), with mean surface runoff consequently 1.57 times lower in forests than in shrublands and 2.41 times lower than in olive crops (20.81, 32.58, and 50.24 mm/h). Likewise, the sediment concentration in the runs is 5.48 times higher in olive groves (518.43 g/L) than in forests (94.61 g/L) and 2.94 times higher than in shrublands (176.48 g/L). Soil properties and parent material might have a more important effect on the studied variables than the different vegetation types. Furthermore, root systems and the use of tillage on crops could favor infiltration, which would tend to equalize the values of the variables analyzed; but this needs to be demonstrated in future research. The results obtained are of interest for vegetation cover and soils management in reservoirs’ catchments in Mediterranean areas. Furthermore, the current research provides an opportunity to study more specifically the origin of the sediment that reaches the reservoirs, beyond sheet and rill erosion.

水库集水区的土地利用和植被类型对土壤入渗和径流的水文过程有重要影响。它们也作为侵蚀过程的驱动因素或约束因素。所有这些过程都会影响到达水库的水和沉积物的数量，并影响水库的功能。本研究的主要目的是通过试验降雨模拟和多元统计分析来提高对西班牙东南部这些过程的认识。结果表明：森林的平均入渗速率是灌丛地的1.06倍，是橄榄作物的1.07倍（分别为280.52、265.02和262.08 mm/h），平均地表径流量是灌丛地的1.57倍，橄榄作物的2.41倍（分别为20.81、32.58和50.24 mm/h）。橄榄林（518.43 g/L）比森林（94.61 g/L）高5.48倍，比灌丛（176.48 g/L）高2.94倍。土壤性质和母质可能比不同植被类型对研究变量的影响更重要。此外，根系和作物耕作方式有利于入渗，这将趋于平衡所分析的变量值；但这需要在未来的研究中得到证实。所得结果对地中海地区水库集水区的植被覆盖和土壤管理具有重要意义。此外，目前的研究提供了一个机会，可以更具体地研究到达水库的沉积物的来源，而不是薄片和细沟侵蚀。

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引用次数: 0

Mechanisms of debris-flow volume growth by eroding highly-consolidated landslide dams 高固结滑坡坝侵蚀泥石流体积增长机理

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2025-01-11 DOI: 10.1016/j.ijsrc.2025.01.001

Pu Li , Kaiheng Hu , Lan Ning

Erosion of landslide dams by a natural debris flow as it travels down a sloping channel can dramatically increase flow size and destructive potential. Most research on the erosion of landslide dams focuses on those newly formed due to recent earthquakes or heavy rainfall. In this study, the debris-flow erosion of so-called highly-consolidated landslide dams (HCLDs) that are typically remnants of ancient earthquakes or rainfall events is investigated by using satellite image interpretation, field measurements, and mechanism analysis. Several HCLDs were identified in two catchments in Zhouqu and Ganluo counties in Gansu and Sichuan province, China, where two high-magnitude debris-flow events occurred in 2010 and 2020, respectively. The existence of HCLDs resulting in wide and narrow reaches alternatively alters the boundary conditions of debris flows and significantly affects the flow erosion and deposition processes. It is observed that the flow discharge increased notably after passing through or during narrowing sections of the channels and the estimated discharge amplification coefficients are approximately 3.3 and 2.7, respectively. The two cases demonstrate that rapid erosion through narrowing sections and subsequent headward erosion play a key role in the debris-flow volume growth by eroding HCLDs. Additionally, other mechanisms such as deposition of erodible material upstream of the dam, localized vortexes in converging and diverging sections, and collisional stresses within the debris flows can further contribute to the erosion of HCLDs and the amplification of debris-flow magnitude. Recognizing these hazardous effects of HCLDs on increasing debris-flow volume is helpful for making non-structural and engineering countermeasures against similar debris flow disasters.

天然泥石流沿着倾斜的河道而下，对滑坡坝的侵蚀会极大地增加水流的大小和破坏潜力。大多数关于滑坡坝侵蚀的研究都集中在那些由于近期地震或强降雨而新形成的滑坡坝上。在本研究中，利用卫星图像解译、现场测量和机制分析，研究了所谓的高固结滑坡坝（HCLDs）的泥石流侵蚀，这些坝通常是古代地震或降雨事件的残留物。在2010年和2020年分别发生过两次高震级泥石流事件的甘肃省舟曲县和四川省甘罗县两个集水区发现了若干高震级泥石流。高裂缝的存在导致河段宽窄交替变化，改变了泥石流的边界条件，显著影响了水流侵蚀和沉积过程。结果表明，通过通道后或通道变窄段时，流量显著增加，流量放大系数分别约为3.3和2.7。这两个例子表明，通过狭窄断面的快速侵蚀和随后的向内侵蚀在侵蚀高分段砾岩的泥石流体积增长中起着关键作用。此外，大坝上游可蚀物质的沉积、汇流段和分流段的局部涡旋以及泥石流内部的碰撞应力等其他机制也会进一步促进高滩的侵蚀和泥石流强度的放大。认识到HCLDs对增加泥石流量的危害作用，有助于制定针对类似泥石流灾害的非结构和工程对策。

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引用次数: 0

Submerged macrophyte-dominated systems fed by karst groundwater produce a significant autochthonous carbon sink in sediment: A mesocosm experiment study 由喀斯特地下水供给的淹没植物主导的系统在沉积物中产生了重要的原生碳汇：一个中生态实验研究

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2024-12-29 DOI: 10.1016/j.ijsrc.2024.12.006

Dong Li , Min Zhao , Hailong Zhang , Zaihua Liu , Xuejun He , Qian Bao , Haibo He , Meixun Zhao

The inland water portion of the carbon cycle is an essential component of the global carbon cycle and is a promising direction to seek missing carbon sinks. Inland waters fix inorganic carbon to form autochthonous organic carbon (Auto-OC) and accept laterally transferred terrestrial OC. Calculating the carbon sink flux of inland water requires a quantitative estimation of the proportion of the aforementioned processes. In the current study, n-alkanes are used as biomarkers and the dual carbon isotope method (Bayesian mixing model) is applied to estimate the proportions of Auto-OC in the sediment of a simulation site comprising five shallow submerged macrophyte-dominated subsystems. The study results showed that a high proportion of Auto-OC was present in all sediment, regardless of the season or subsystem. However, the proportions were higher in the warm-humid season than in the cold-dry season. Results from a correlation analysis showed that temperature-controlled seasonal variations in the photosynthetic strength of aquatic organisms are the most likely cause of this difference. The average deposition rates of total organic carbon and Auto-OC were high (66.7 and 58.2 g C/m²/yr, respectively). Throughout the year, the weighted average percentage of Auto-OC ranged from 76% to 90%, with a mean value of 86% in the five aquatic subsystems. Establishing and maintaining submerged macrophyte-dominated systems have a potential of decreasing carbon dioxide (CO₂) evasion and sequestrating more carbon (C) in headwaters. Working for clear submerged macrophyte-dominated lakes is beneficial for increasing carbon sinks.

碳循环的内陆水部分是全球碳循环的重要组成部分，是寻找缺失碳汇的一个有希望的方向。内陆水域将无机碳固定形成原生有机碳（Auto-OC），并接受横向转移的陆源有机碳。计算内陆水碳汇通量需要对上述过程的比例进行定量估计。本研究以正构烷烃为生物标志物，采用双碳同位素法（贝叶斯混合模型）估算了由5个浅水淹没植物为主的模拟站点沉积物中Auto-OC的比例。研究结果表明，无论季节还是分系统，所有沉积物中都存在较高比例的Auto-OC。但暖湿季节的比例高于冷干季节。相关分析结果表明，温度控制下水生生物光合强度的季节性变化最有可能是造成这种差异的原因。总有机碳和自动oc的平均沉积速率较高，分别为66.7和58.2 g C/m2/yr。全年Auto-OC的加权平均百分比为76% ~ 90%，5个水生子系统的平均值为86%。建立和维持以淹没植物为主的系统具有减少二氧化碳（CO2）逃逸和在水源中固存更多碳(C)的潜力。在清澈的水下以大型植物为主的湖泊中工作有利于增加碳汇。

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引用次数: 0

Impact of different types of sediment-filled check dam systems on runoff erosion dynamics in a Loess Plateau watershed 黄土高原不同类型填沙淤积坝对流域径流侵蚀动力学的影响

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2024-12-27 DOI: 10.1016/j.ijsrc.2024.12.007

Ganggang Ke, Shengdong Cheng, Zhanbin Li, Tian Wang, Heng Wu, Yunzhe Zhen

Check dams, as one of the most representative soil and water conservation measures in the Loess Plateau region, primarily impact hydrological and hydrodynamic processes by regulating flows of water and sediment. Constrained by reservoir capacity, sediment accumulation within check dam systems affects their ability to intercept water and sediment. However, there has been limited research on the regulatory role of sediment-filled check dams on watershed hydrodynamics. This study focused on small watersheds in loess hilly gully areas and applied the MIKE SHE model to simulate hydrodynamic processes under different scenarios of filled check dam systems. The regulatory effect of different filled check dam system types on watershed hydrodynamics in the study area was analyzed. The results indicate that after sedimentation in various types of check dams, the peak flow can be reduced by 59.68%–68.66%, the flood duration can be extended by 42.74%–375.81%, and the runoff erosion power can be reduced by 62.92%–85.35%. The reduction in flood volume diminishes with increasing sedimentation, reaching a minimum of 2.42%. Moreover, there are varying degrees of reduction in runoff erosion dynamics in the main channels. These findings provide theoretical support for identifying the regulatory potential of sediment-filled check dam systems on hydrodynamic processes in small watersheds.

拦坝是黄土高原地区最具代表性的水土保持措施之一，其主要作用是调节水沙流量，影响水文动力过程。受水库容量的制约，止沙坝系统内的泥沙淤积影响其截水截沙能力。然而，关于填沙淤积坝对流域水动力的调节作用的研究还比较有限。本文以黄土丘陵沟壑区小流域为研究对象，应用MIKE SHE模型模拟了不同淤地坝体系情景下的水动力过程。分析了研究区不同填筑挡土坝体系类型对流域水动力的调节作用。结果表明：各类型淤积坝淤积后，洪峰流量可降低59.68% ~ 68.66%，洪期可延长42.74% ~ 375.81%，径流侵蚀功率可降低62.92% ~ 85.35%；随着泥沙淤积的增加，洪量减小幅度逐渐减小，最小可达2.42%。此外，主河道的径流侵蚀动态也有不同程度的减少。这些发现为确定填沙止回坝系统对小流域水动力过程的调节潜力提供了理论支持。

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引用次数: 0

The use of InVEST-SDR model to evaluate soil erosion and sedimentation in the closer catchment of a proposed tropical reservoir in Sri Lanka 利用InVEST-SDR模型评估斯里兰卡拟建的热带水库附近集水区的土壤侵蚀和沉积

IF 3.5 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research

Pub Date : 2024-12-25 DOI: 10.1016/j.ijsrc.2024.12.005

Hulan Badde Gedara Dilshan Madubhashana Padminda Ekanayaka , Nimal Shantha Abeysingha , Tusita Amarasekara , Ram Lakhan Ray , Dinithi Kusalani Samarathunga

Soil erosion is a significant environmental threat, impacting water quality and the siltation of the productive capacity of reservoirs. To prioritize soil conservation areas for sustainable land management, quantitative spatial assessment of soil erosion is essential, particularly in the catchment of a reservoir. The current study aims to evaluate the soil erosion severity and sediment generation in the closer catchment of a proposed reservoir, the lower Malwathu Oya Reservoir in Sri Lanka. Erosion modeling has proven cost-effective in assessing the spatial distribution of soil erosion severity. This current study utilized the Integrated valuation of ecosystem services and tradeoffs sediment delivery ratio (InVEST-SDR) model to analyze the spatial distribution of soil erosion and sediment export. A digital elevation model (30 m × 30 m), 22 years of rainfall data, land use and land cover data, soil map, and cropping factors were used as model inputs. The results revealed an average annual soil loss ranging from 0 to 15.55 t/(ha·y) in the catchment and a mean annual sediment export of 0.016 t/(ha·y). Erosion severity was classified into four hazard classes, i.e., insignificant (<0.5 t/(ha·y)), weak (0.5–3 t/(ha·y)), considerable (3–12 t/(ha·y)), and severe (12 < t/(ha·y)). A critical 0.12% area was identified as a considerable soil erosion hazard area, necessitating urgent measures for erosion control. High-risk areas were at Galpottegama, Asirikgama, Puleliya, Navodagama, and Thuppitiyawa Grama Niladari. These findings provide valuable insight for formulating and implementing soil conservation practices in the catchment to reduce the siltation of the proposed lower Malwathu Oya reservoir. The study is an example of using InVEST-SDR to evaluate the sedimentation of a proposed reservoir.

水土流失是一个重大的环境威胁，影响着水库的水质和生产能力。为了优先考虑可持续土地管理的土壤保持区，必须对土壤侵蚀进行定量空间评估，特别是在水库集水区。目前的研究旨在评估一个拟议的水库——斯里兰卡Malwathu Oya水库——的近集水区的土壤侵蚀严重程度和沉积物生成。侵蚀模型在评估土壤侵蚀严重程度的空间分布方面已被证明是具有成本效益的。本研究利用生态系统服务与输沙权衡综合评价（InVEST-SDR）模型分析了土壤侵蚀与输沙的空间分布。采用数字高程模型（30 m × 30 m）、22年的降雨数据、土地利用和土地覆盖数据、土壤图和种植因子作为模型输入。结果表明，流域年平均土壤流失量为0 ~ 15.55 t/(ha·y)，年平均输沙量为0.016 t/（ha·y）。侵蚀严重程度分为不显著（0.5 t/(ha·y)）、弱（0.5 - 3 t/(ha·y)）、相当（3-12 t/(ha·y)）和严重(12 <；t /(哈·y))。有0.12%的临界区域被确定为相当大的水土流失危险区，需要采取紧急的水土流失治理措施。高风险地区为Galpottegama、Asirikgama、Puleliya、Navodagama和Thuppitiyawa Grama Niladari。这些发现为制定和实施流域土壤保持措施提供了有价值的见解，以减少拟议的Malwathu Oya下游水库的淤积。该研究是使用InVEST-SDR评价拟建储层沉积的一个例子。

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引用次数: 0