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Determination of river flow and sediment regime changes in response to construction of regulating dams: an indicator-based approach 调节水坝建设对河流流量和泥沙状态变化的响应:一种基于指标的方法
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-28 DOI: 10.1007/s12665-024-12058-3
Raoof Mostafazadeh, Elham Azizi

Construction of dams causes changes in the natural flow and sediment patterns of rivers, disrupting their ecosystems. This study aims to evaluate how two dams in Ardabil province affect river flow and sediment load indicators. Several indices, including mean annual flow/sediment load (A), flow/sediment load duration curve difference (M), flow/sediment load duration variability (Dv), and seasonal period (SP), were employed to evaluate the impact of regulatory dams on the monthly flow/sediment regime of the river. Results indicate similar monthly flow and sediment load values at the upstream and downstream stations of Yamchi dam, with a slight increase at the downstream station of Sabalan dam. Yamchi dam had a more substantial impact than Sabalan dam on flow and sediment load indices. Both dams exhibited high seasonal amplitude (SA), signifying significant flow and sediment load variability. The Yamchi dam had more effect on flow index changes, with a flow duration curve difference (M = 0.77). Additionally, the changes in sediment-related indices were greater at Polealmas compared to Doost Bigloo (0.98 vs. 0.8), indicating a reduced sediment-related impact during the study period. The monthly changes in flow and sediment load at the upstream and downstream stations of both dams followed the same pattern. The study emphasizes the different impacts of dams on the flow/sediment load regime of the river, implying varying ecological implications on the river ecosystem and riparian zones. The findings emphasize the importance of considering multiple indicators to comprehensively evaluate dam impacts on river dynamics and underscore the impacts on flow regime and river ecosystem.

水坝的建设改变了河流的自然流动和沉积模式,破坏了河流的生态系统。本研究旨在评价阿达比尔省两座大坝对河流流量和泥沙负荷指标的影响。采用年平均流沙负荷(A)、流沙负荷持续时间曲线差(M)、流沙负荷持续时间变异(Dv)和季节周期(SP)等指标,评价了调节坝对黄河月流沙变化的影响。结果表明,山池坝上下游站的月流沙负荷值基本一致,而萨巴兰坝下游站的月流沙负荷值略有增加。山池坝对水流和泥沙负荷指标的影响大于萨巴兰坝。两坝均表现出较高的季节振幅(SA),表明水流和泥沙负荷具有显著的变化。山池坝对流量指标变化的影响更大,其流量持续时间曲线差异(M = 0.77)。此外,与Doost Bigloo相比,Polealmas与沉积物相关指数的变化更大(0.98比0.8),表明在研究期间与沉积物相关的影响减少。两个大坝上下游站的流量和沙量的月变化规律基本一致。该研究强调了大坝对河流流量/泥沙负荷的不同影响,这意味着对河流生态系统和河岸带的不同生态影响。研究结果强调了综合评价大坝对河流动态影响的重要性,强调了大坝对河流流态和河流生态系统的影响。
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引用次数: 0
Comparative analysis of horizontal and pipe drains in earth dams: optimizing seepage control and stability (case study) 土坝水平排水与管道排水的对比分析:优化渗流控制与稳定性(案例研究)
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-28 DOI: 10.1007/s12665-024-12065-4
Hicham Charrak, Hosni Abderrahmane Taleb, Hamza Loualbia, Salah Eddine Bouguerba

This study presents a comparative analysis of horizontal and pipe drains in earth dams, focusing on optimizing seepage control and stability. Using the Kreireche dam in Algeria as a case study, we employed GeoSlope software (SEEP/W and SLOPE/W) to conduct numerical simulations across 20 different scenarios, varying drain configurations and hydraulic conditions. Results indicate that pipe drains significantly outperform horizontal drains in managing seepage and enhancing dam stability. Pipe drains with larger diameters (2 m) reduced pore pressure by 15–20% compared to horizontal drains, demonstrating superior seepage control. Optimal drain placement within the range of X/B = 0.2 to 0.4 led to maximum safety factors, highlighting the importance of drain positioning. Statistical analysis using RMS, MAE, and MSE metrics showed that pipe drains consistently provided more reliable seepage and exit gradient control compared to horizontal drains. Increasing pipe drain diameter from 1 m to 2 m improved discharge seepage prediction consistency, reducing normalized RMS and MAE by 18.5% and 17.3%, respectively. Pipe drains exhibited 64.2% lower normalized RMS values for exit gradient predictions compared to horizontal drains, indicating more effective erosion risk mitigation. This study provides important insights for enhancing drainage system design in earth dams, resulting in increased stability and long-term performance of these crucial water management structures.

本文对土坝水平排水管和管道排水管进行了对比分析,重点研究了土坝渗流控制和稳定性的优化问题。以阿尔及利亚的Kreireche大坝为例,我们使用GeoSlope软件(SEEP/W和SLOPE/W)进行了20种不同情况下的数值模拟,包括不同的排水配置和水力条件。结果表明,管道排水在控制渗流和提高大坝稳定性方面明显优于水平排水。与水平排水管相比,直径较大(2米)的管道排水管降低了15-20%的孔隙压力,显示出更好的防渗能力。X/B = 0.2 ~ 0.4范围内的最佳排水管位置安全系数最大,突出了排水管位置的重要性。使用RMS、MAE和MSE指标进行的统计分析表明,与水平排水管相比,管道排水管始终提供更可靠的渗流和出口梯度控制。将管道排水直径从1 m增加到2 m,提高了排水渗流预测的一致性,使归一化RMS和MAE分别降低了18.5%和17.3%。与水平排水管相比,管道出口梯度预测的标准化均方根值降低了64.2%,表明更有效地缓解了侵蚀风险。本研究为加强土坝排水系统设计提供了重要见解,从而提高了这些关键水管理结构的稳定性和长期性能。
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引用次数: 0
Mineralogy and geochemistry of sands from Playa las Golondrinas, Puerto Rico: an approach to establishing a geogenic background 波多黎各Playa las Golondrinas砂的矿物学和地球化学:一种建立地质背景的方法
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-28 DOI: 10.1007/s12665-024-12010-5
Audrey Allen, Claire L. McLeod, Liannie C. Velázquez Santana, Maddy Zimmerer, Marion L. Lytle, Ethan Krekeler, Will Amick, Jonathan Tegge, Wilnelly Ventura-Valentín, Jordan Vest, Abigale O’Connor, Barry Shaulis, Landon Stitle, Spencer Snell, Mark P. S. Krekeler

Sands from the dune, berm, and shore environments at Playa las Golondrinas (18° 30′ 51″ N, 67° 3′ 26″) were investigated to explore how beach sands could be applied as a potential environmental (geogenic) background for the local region. Grain size is dominantly unimodal classifying as fine to medium sand. Hydraulic conductivity values range from 1.07 cm/s (berm) to 1.49 cm/s (shoreface). Sample mineralogy as constrained by X-ray diffraction (XRD) reveals a dominance of quartz and feldspar with minor Mg-calcite, pyroxene, and olivine. Light microscopy and scanning electron microscopy-energy dispersive spectroscopy (SEM–EDS) support XRD data and indicate the presence of oxide-bearing lithic fragments in addition to biologic materials (e.g., corals. forams). Reflective spectra are consistent with XRD and microscopy. Bulk element concentrations determined using inductively coupled plasma—mass spectrometry (ICP-MS) are consistent with derivation from the arc-related rocks of Puerto Rico’s interior exhibiting LILE enrichment, Pb-enrichment, and associated Nb–Ta depletion. The majority of the bulk elemental concentrations are below those of average upper continental crust (UCC) values and element co-variation trends (e.g., wt. % Fe2O3 vs. As) are interpreted as geogenic in origin. Berm sands are enriched in Fe, Mn, Ni, Cr, V, and As compared to dune and shore samples and this signature is interpreted as being from a wind-driven winnowing effect. The exact form of As (As3+ or As5+) remains unconstrained and thus it is unknown if As is mobile in this environment. Reflective spectra, supported by grain size, mineralogy, and bulk chemistry, enables future remote sensing investigations by providing detailed constraints on sand in environmentally sensitive areas. This study therefore provides local context for metal pollution studies across the region.

研究了Playa las Golondrinas(18°30′51″N, 67°3′26″)沙丘、护堤和海岸环境中的沙子,探讨了如何将海滩沙子作为当地潜在的环境(地质)背景。粒度主要为单峰型,分为细砂至中砂。水力传导性值范围从1.07厘米/秒(河堤)到1.49厘米/秒(岸边)。样品的x射线衍射(XRD)显示石英和长石为主,少量镁方解石、辉石和橄榄石。光学显微镜和扫描电子显微镜-能量色散光谱(SEM-EDS)支持XRD数据,并表明除了生物材料(例如珊瑚)外,还存在含氧化物的岩屑碎片。有孔虫)。反射光谱与XRD和显微相一致。电感耦合等离子体质谱(ICP-MS)测定的大块元素浓度与波多黎各内陆弧相关岩石的衍生结果一致,显示出LILE富集、pb富集和相关的Nb-Ta枯竭。大部分大块元素浓度低于平均上大陆地壳(UCC)值,元素共变趋势(例如,wt. % Fe2O3 vs. As)被解释为地球成因。与沙丘和海岸样品相比,护堤砂富含Fe, Mn, Ni, Cr, V和As,这一特征被解释为来自风驱动的簸扬效应。As的确切形式(As3+或As5+)仍然不受约束,因此不知道As在这种环境中是否可移动。在粒度、矿物学和体化学的支持下,反射光谱可以通过提供环境敏感地区砂的详细限制条件,实现未来的遥感调查。因此,这项研究为整个地区的金属污染研究提供了当地背景。
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引用次数: 0
Effect of locust bean gum biopolymer on mechanical properties of organic soil 刺槐豆胶生物聚合物对有机土壤力学特性的影响
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-28 DOI: 10.1007/s12665-024-12030-1
Xianfei Shen, Lina Wang, Bijin Yang, Jiayuan Han, Lianxing Zhang

In recent years, biopolymers have been widely used in soil, but few concentration on the application of biopolymers in the organic soil. In this work, the potential using locust bean gum for improving the physical characteristics of the organic soil has been fully evaluated, while the Atterberg limit test, unconfined compressive strength test, and unconsolidated undrained shear test were conducted. In addition, the mineral composition and micro-mechanisms have been analyzed by X-ray diffraction tests, Fourier transform infrared spectra tests, and scanning electron microscopy tests. And we found that locust bean gum could increase the liquid limit and plastic limit of the organic soil, and enchance the compressive strength and shear strength. The increase in soil cohesion with locust bean gum content was more pronounced than the increase in internal friction angle. And as the curing time progresses, locust bean gum gradually transformed from a hydrogel state to a high tensile strength biofilm or flocculent gel matrix, which enhanced the bonding force between soil particles, thus increasing the strength of the specimens, which can be validated by the scanning electron microscopy observations, in which the porosity of soil was significantly reduced. We believed that this work could provide an ecological, economical and practical insight dealing with the engineering project constructions in the organic soil area.

近年来,生物聚合物在土壤中得到了广泛的应用,但对生物聚合物在有机土壤中的应用研究较少。本工作充分评价了刺槐豆胶改善有机土物理特性的潜力,并进行了Atterberg极限试验、无侧限抗压强度试验和松散不排水剪切试验。通过x射线衍射测试、傅里叶变换红外光谱测试和扫描电镜测试,分析了矿物组成和微观机理。结果表明,刺槐豆胶能提高有机土的液限和塑限,提高有机土的抗压强度和抗剪强度。随着刺槐豆胶含量的增加,土壤黏聚力的增加比内摩擦角的增加更为明显。随着固化时间的延长,刺槐豆胶逐渐由水凝胶状态转变为高抗拉强度的生物膜或絮状凝胶基质,增强了土壤颗粒之间的结合力,从而提高了试样的强度,这一点可以通过扫描电镜观察得到验证,土壤的孔隙度明显降低。本研究可为有机土区工程项目建设提供生态、经济、实用的指导。
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引用次数: 0
Enhanced landslide susceptibility zonation using GIS-Based ensemble techniques 基于gis的集成技术增强滑坡易感性分区
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-28 DOI: 10.1007/s12665-024-12032-z
Ankur Sharma, Har Amrit Singh Sandhu, Claudia Cherubini

Landslide Susceptibility Zonation is an efficient technique decision-makers use for disaster mitigation in landslide-prone regions. This study proposes an alternate approach for LSZ mapping, aiming to mitigate the limitations of the subjective expert opinion-based methods presently employed by disaster management authorities in India. Consequently, a GIS-based ensemble of Frequency Ratio and Analytical Hierarchy Process is employed, which offers a more robust and objective evaluation of Landslide Susceptibility. A landslide inventory of 592 incidents is processed using the database maintained by the Geological Survey of India, the national nodal agency for landslide studies. Then, LSZ mapping is conducted for a selected region in the Indian Himalayas using the processed inventory and nine causative factors (Elevation, Slope, Aspect, Curvature, Terrain Ruggedness Index (TRI), Distance to drainage, Land Use/Land Cover (LULC), Geology, and Lithology) as input. The generated LSZ map is evaluated using separate subsets of the inventory, yielding accuracies of 74.13% and 75.08%, respectively, during the training and testing stages. The study's findings hold potential implications for more effective disaster mitigation strategies and early warning systems in landslide-prone regions.

滑坡易感性区划是决策者在滑坡易发地区进行减灾的一种有效方法。本研究提出了一种用于LSZ制图的替代方法,旨在减轻印度灾害管理当局目前采用的基于主观专家意见的方法的局限性。因此,采用基于gis的频率比集成和层次分析法,对滑坡易感性进行了更为稳健和客观的评价。592起滑坡事件的清单是利用印度地质调查局(滑坡研究的国家节点机构)维护的数据库处理的。然后,利用处理后的库存和9个因素(高程、坡度、坡向、曲率、地形崎岖指数(TRI)、到排水距离、土地利用/土地覆盖(LULC)、地质和岩性)作为输入,对印度喜马拉雅地区的选定区域进行LSZ制图。生成的LSZ地图使用清单的单独子集进行评估,在训练和测试阶段分别产生74.13%和75.08%的准确性。这项研究的发现对在滑坡易发地区建立更有效的减灾战略和早期预警系统具有潜在的意义。
{"title":"Enhanced landslide susceptibility zonation using GIS-Based ensemble techniques","authors":"Ankur Sharma,&nbsp;Har Amrit Singh Sandhu,&nbsp;Claudia Cherubini","doi":"10.1007/s12665-024-12032-z","DOIUrl":"10.1007/s12665-024-12032-z","url":null,"abstract":"<div><p>Landslide Susceptibility Zonation is an efficient technique decision-makers use for disaster mitigation in landslide-prone regions. This study proposes an alternate approach for LSZ mapping, aiming to mitigate the limitations of the subjective expert opinion-based methods presently employed by disaster management authorities in India. Consequently, a GIS-based ensemble of Frequency Ratio and Analytical Hierarchy Process is employed, which offers a more robust and objective evaluation of Landslide Susceptibility. A landslide inventory of 592 incidents is processed using the database maintained by the Geological Survey of India, the national nodal agency for landslide studies. Then, LSZ mapping is conducted for a selected region in the Indian Himalayas using the processed inventory and nine causative factors (Elevation, Slope, Aspect, Curvature, Terrain Ruggedness Index (TRI), Distance to drainage, Land Use/Land Cover (LULC), Geology, and Lithology) as input. The generated LSZ map is evaluated using separate subsets of the inventory, yielding accuracies of 74.13% and 75.08%, respectively, during the training and testing stages. The study's findings hold potential implications for more effective disaster mitigation strategies and early warning systems in landslide-prone regions.</p></div>","PeriodicalId":542,"journal":{"name":"Environmental Earth Sciences","volume":"84 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Retraction Note: Examining the variation of soil moisture from cosmic-ray neutron probes footprint: experimental results from a COSMOS-UK site 缩回注:从宇宙射线中子探测器足迹中检测土壤湿度的变化:来自COSMOS-UK站点的实验结果
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-24 DOI: 10.1007/s12665-024-12046-7
Owen D. Howells, George P. Petropoulos, Dimitris Triantakonstantis, Zacharias Ioannou, Prashant K. Srivastava, Spyridon E. Detsikas, George Stavroulakis
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引用次数: 0
Geochemical and magnetic properties in fluvial and lacustrine systems as environmental quality proxies in the Atacama Desert 阿塔卡马沙漠河流和湖泊系统的地球化学和磁性特征作为环境质量指标
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-24 DOI: 10.1007/s12665-024-12023-0
Adriana Aránguiz-Acuña, Héctor Pizarro, Abraham Flores-Varas, Joseline Tapia, Josefina Herrera, Santiago Maza

Rivers play a crucial role in landscape evolution and human development, especially in arid zones, where hydrological resources are scarce and in high demand. The Atacama Desert is one of the world’s oldest and driest non-polar deserts, and aquatic systems therein have been historically subjected to anthropogenic pressure mainly associated with natural resource exploitation, such as water consumption for industrial mining activities. The mining industry has experienced a systematic development since the early 20th century, making Chile one of the main worldwide copper producers. This study analyzed sediments from two Atacama Desert rivers, the Loa and Salado Rivers (Antofagasta Region, Northern Chile). Sedimentary short-cores were obtained from sampled locations at varying distances from the confluence of the rivers. The characterization of chemical components, grain size, mineralogy, and magnetic properties of the rivers’ sediments was assessed in surface and subsurface samples to determine their respective signatures in the Inka-Coya Lake near the rivers’ confluence. The magnetic mineralogy present in the sediments of both rivers is composed of detrital magnetite and maghemite interspersed with those of authigenic origin. However, the downstream Loa River concentrated more authigenic minerals than the Salado and increased the abundance of silt-sized particles. The grain size of the Loa’s channel bed suggests low stream competency and high formation of depositional habitats. The magnetic signal and mineralogical composition of sediments from the lake are dominated by detrital pyrite, magnetite, and authigenic greigite. In contrast, the river’s sediments were dominated by magnetite and maghemite of detrital origin intercalated with those of authigenic origin. The granulometry, mineralogy, and rock magnetic properties of Inka-Coya Lake sediments indicate recent detrital input alternating with authigenic mineral-rich layers, mainly reflecting shifts in hydrological regimes. The highest concentrations of copper were observed in the upper, more recent sediment layers. Future scenarios of risky climatic conditions associated with increasing global metal demands could modify the availability of potentially toxic elements and transport capability in fluvial sediments, increasing the threats to water resource conservation in the world’s most arid desert.

河流在景观演变和人类发展中发挥着至关重要的作用,特别是在水文资源稀缺且需求量大的干旱区。阿塔卡马沙漠是世界上最古老和最干燥的非极地沙漠之一,其中的水生系统在历史上一直受到主要与自然资源开发有关的人为压力,例如工业采矿活动的用水。自20世纪初以来,采矿业经历了系统的发展,使智利成为世界上主要的铜生产国之一。本研究分析了两条阿塔卡马沙漠河流,洛阿河和萨拉多河(智利北部安托法加斯塔地区)的沉积物。在距离河流汇合处不同距离的采样地点获得了沉积短芯。在河流汇合处附近的Inka-Coya湖,对河流表面和地下样品的化学成分、粒度、矿物学和磁性进行了评估,以确定它们各自的特征。两河沉积物的磁性矿物学特征为碎屑磁铁矿和磁赤铁矿与自生磁铁矿相互穿插。然而,下游的罗亚河比萨拉多河集中了更多的自生矿物,并增加了粉砂大小颗粒的丰度。罗阿河河床的粒度表明,河道的水流能力较弱,沉积生境的形成程度较高。湖泊沉积物的磁性信号和矿物组成以碎屑黄铁矿、磁铁矿和自生灰长岩为主。河流沉积物以碎屑成因的磁铁矿和磁赤铁矿为主,自生成因居间。Inka-Coya湖沉积物的粒度学、矿物学和岩石磁性特征表明,最近的碎屑输入与自生富矿物质层交替发生,主要反映了水文制度的变化。在较近的上层沉积层中观察到铜的最高浓度。未来与全球金属需求增加有关的危险气候条件可能改变潜在有毒元素的供应和河流沉积物的运输能力,增加对世界上最干旱沙漠水资源保护的威胁。
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引用次数: 0
Study on the mechanical properties of sandstone-concrete composite interface under the dry–wet cycle action 干湿循环作用下砂岩-混凝土复合界面力学性能研究
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-23 DOI: 10.1007/s12665-024-12015-0
Maoyi Liu, Yunfan Luo, Jing Bi

The dry–wet cycle will cause the deterioration of rock mass and grouting materials in the anchoring system, and then affect their strength and deformation, which has an important impact on the stability and durability of geotechnical engineering. In this paper, the damage and deterioration effects of sandstone-concrete composite samples under dry and wet cycle conditions are studied by using nuclear magnetic resonance technology, and the mechanism of anchoring system under dry and wet cycle conditions is revealed. The experimental results show that rock and concrete are damaged to different degrees under the action of wet and dry circulation. The micropore content of the whole sample increased and the medium and macro pores expand continuously during the dry–wet cycle action. The cracks development with the increase of number of dry–wet cycles intensify the damage of the sandstone-concrete connection surface. It can be observed that the damage of sandstone part is much lower than that of concrete part under the action of dry–wet cycle based on NMR image. The drawing process compresses the pores and enhances the plastic ability of CRC (concrete rock composite) sample, which explains the mechanical law that the drawing force of low-strength concrete increases gradually with the increase of the number of dry–wet cycles due to the increase of the internal pores of the CRC sample.

干湿循环会引起锚固体系内岩体和注浆材料的劣化,进而影响其强度和变形,对岩土工程的稳定性和耐久性产生重要影响。本文利用核磁共振技术研究了砂岩-混凝土复合材料试样在干湿循环条件下的损伤和劣化效应,揭示了干湿循环条件下锚固体系的作用机理。试验结果表明,在干湿循环作用下,岩石和混凝土均有不同程度的破坏。在干湿循环作用下,整个试样的微孔含量增加,中、宏观孔隙不断扩大。随着干湿循环次数的增加,裂缝的发展加剧了砂岩-混凝土结合面的破坏。通过核磁共振图像可以看出,在干湿循环作用下,砂岩部分的损伤程度远低于混凝土部分。拉伸过程压缩了孔隙,增强了CRC(混凝土岩石复合材料)试样的塑性能力,解释了由于CRC试样内部孔隙的增加,低强度混凝土的拉伸力随着干湿循环次数的增加而逐渐增大的力学规律。
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引用次数: 0
Proposal for analysis of minimum ecological flow regimes based on the achievement of technical and environmental objectives: Tagus River basin case study (Spain) 基于实现技术和环境目标分析最小生态流量制度的建议:塔霍河流域案例研究(西班牙)
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-23 DOI: 10.1007/s12665-024-12024-z
Domingo Baeza Sanz, Beatriz Larraz Iribas, Patricia Chacón Calvo

An environmental flow (e-flow) regime is designed to mitigate the effects of hydrological changes on rivers and to achieve good environmental status of a river as required by the Water Framework Directive (WFD). Once the components of an e-flow regime have been defined, it is important to verify that it meets its objectives, ideally through field sampling. However, field sampling is often avoided due to its high cost and time demands. This paper presents a methodology for validating a proposed river flow regime prior to implementation, allowing its suitability to be assessed without the costs and delays associated with monitoring and ecosystem response studies. The method includes a hydrological process that compares the official flow regime with the natural regime, and a hydraulic simulation process that tests the flow regime in terms of habitability for fauna. The method is tested on four reaches of the Tagus River, which have undergone significant hydrological alterations, using two different environmental flow regime proposals: one official and the other proposed by the authors. The results show a significant reduction in the annual inflows under the official e-flow regime compared to the natural ones (about 25% of the natural total), as well as a simplification of the seasonal flow variation in all river reaches. In addition, the study shows that at the minimum flows proposed in the official regime, three of the stretches would experience conditions that may impede fish migration. This method of inspecting e-flows can be useful for testing mitigation measures for hydrological changes in the very early stages of their application.

环境流量(e-flow)制度旨在减轻水文变化对河流的影响,并按照水框架指令(WFD)的要求实现河流的良好环境状态。一旦确定了电子流量制度的组成部分,重要的是要验证它是否符合其目标,最好是通过现场抽样。然而,由于成本和时间要求高,往往避免现场采样。本文提出了一种在实施之前验证拟议的河流流量状况的方法,允许评估其适用性,而无需与监测和生态系统响应研究相关的成本和延迟。该方法包括一个水文过程,将官方流量制度与自然制度进行比较,以及一个水力模拟过程,根据动物的可居住性测试流量制度。该方法在经历了重大水文变化的塔霍河的四条河段上进行了测试,使用了两种不同的环境流量制度建议:一种是官方的,另一种是作者提出的。结果表明,与自然流量相比,官方电子流量制度下的年流入量显著减少(约占自然总量的25%),并且简化了所有河流的季节流量变化。此外,研究表明,在官方规定的最小流量下,其中三个延伸段可能会遇到阻碍鱼类洄游的条件。这种检查电子流量的方法可用于在应用的早期阶段测试水文变化缓解措施。
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引用次数: 0
Water resources sustainability through evaluation of hydrogeological conditions using D–Z parameters in Saraswati Nagar block of district Yamuna Nagar, Haryana, India 利用D-Z参数评价印度哈里亚纳邦亚穆纳加尔地区Saraswati Nagar区块水文地质条件的水资源可持续性
IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2024-12-23 DOI: 10.1007/s12665-024-12026-x
Savita Singh, Bhagwan Singh Chaudhary, Sushil Kumar, Shailesh Bhatnagar, Priyanka Singh, Anurag Khanna

Groundwater is vital for meeting water demands in India, especially for agriculture, but faces stress from industrialization, urbanization, and climate change. Sustainable management, including understanding aquifers and recharge zones like palaeochannels, is essential to ensure long-term groundwater availability. The present research explored the applications of surface geophysical Dar-Zarrouk (D–Z) parameters, estimated from Vertical Electrical Sounding (VES) surveys conducted at seventeen locations, to assess hydrogeological conditions and correlate the findings with the identified palaeochannels within the alluvial area of Saraswati Nagar block of district Yamuna Nagar, Haryana, India. Further, as the study area is occupied with fresh groundwater, the estimated D–Z parameters including Transverse Resistance ((T)) and Longitudinal Conductance ((S)) values should be relatively on the higher side in comparison to the saline groundwater-occupied areas. In the study area, (S) values vary between 0.2025 (Sahabpur) and 2.49 (Talakaur) mho with an average value of 0.9364 mho, and (T) values vary between 922.96 (Bhamboli) and 5505 (Kabulpur) Ωm2 with an average value of 3000.75 Ωm2 respectively. The results of the electrical resistivity survey have been used for estimating the hydraulic conductivity ((K)) and transmissivity ((t)). Hydraulic parameters such as hydraulic conductivity and transmissivity are pivotal in evaluating and controlling groundwater resources. The findings highlight the valuable insights gained for groundwater resource management. This type of study has not been attempted before by any researcher in this regions hence, it will greatly help in understanding the groundwater regime in the area.

地下水对满足印度的用水需求至关重要,尤其是对农业而言,但它面临着工业化、城市化和气候变化带来的压力。可持续管理,包括了解含水层和像古河道这样的补给区,对于确保地下水的长期可用性至关重要。本研究探索了地表地球物理Dar-Zarrouk (D-Z)参数的应用,这些参数是根据在印度哈里亚纳邦亚穆纳加尔地区的17个地点进行的垂直电测深(VES)调查估计的,以评估水文地质条件,并将这些发现与印度哈里亚纳邦亚穆纳加尔地区Saraswati Nagar区块冲积区内已确定的古河道相关联。此外,由于研究区为淡水区,估算的横向电阻((T))和纵向电导((S))等D-Z参数值相对于含盐地下水区应偏高。研究区(S)值在0.2025 (Sahabpur) ~ 2.49 (Talakaur)之间变化,平均值为0.9364 mho, (T)值在922.96 (Bhamboli) ~ 5505 (Kabulpur) Ωm2之间变化,平均值为3000.75 Ωm2。电阻率测量结果已用于估算水力导电性((K))和透过率((t))。水力参数如导水率和透水率是评价和控制地下水资源的关键。这些发现突出了为地下水资源管理获得的宝贵见解。这种类型的研究以前没有任何研究人员在该地区进行过,因此,它将极大地有助于了解该地区的地下水状况。
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Environmental Earth Sciences
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