Journal of Hydrology-Regional Studies最新文献_第2页

Analysis of turbidity current plunging and floating woody debris in a reservoir during flood events 洪水期水库浊流骤降和漂浮木屑分析

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-10 DOI: 10.1016/j.ejrh.2024.102027

Fong-Zuo Lee , Jihn-Sung Lai , Sameh Ahmed Kantoush , Tetsuya Sumi

Study region

Many reservoirs worldwide experience the challenge of managing woody debris and determining the feasible location to set a floating barrier as a mitigation strategy to restrict their progression towards the dam. While the turbidity current plunges along the reservoir bed to form the underflow mud layer, the reverse current generated in the plunging flow region holds the woody debris.

Study focus

The present study attempts to define the plunging zone in correlation with the floating woody debris based on field observations, densimetric Froude number, plunging formula, and entrainment formula to investigate the plunge point location. When woody debris is carried by the sediment-laden inflow through the reservoir, the volume of woody debris needs to be estimated and extracted after the flood recession.

New hydrological insight for the region

According to the results of the analysis, the plunge point location was suggested as the critical condition of the densimetric Froude number for a floating barrier setup. Two proposed equations are presented to identify the turbidity current vertical profiles of velocity and sediment concentration. Considering hydrological conditions, the inflow peak sediment yield has added an optimal quantitative estimation of woody debris volumes than that by inflow peak discharge, total inflow sediment yield, maximum rainfall intensity, and total rainfall. The presented threshold values of hydrological patterns can serve as a critical warning indicator for the preparation of extraction operations for floating woody debris.

研究区域世界各地的许多水库都面临着管理木质碎屑的挑战，如何确定设置漂浮障碍物的可行位置，作为限制木质碎屑向大坝移动的缓解策略？研究重点本研究试图根据现场观测、密度测定弗劳德数、骤降公式和夹带公式，确定与漂浮木屑相关的骤降区，以研究骤降点位置。当木质碎屑被含有泥沙的流入水流携带通过水库时，需要估算木质碎屑的体积，并在洪水退去后将其提取出来。根据分析结果，坠点位置被认为是浮障设置的密度测定 Froude 数的临界条件。提出了两个拟议方程来确定浊流垂直剖面的速度和沉积物浓度。考虑到水文条件，与流入峰值排水量、总流入泥沙量、最大降雨强度和总降雨量相比，流入峰值泥沙量增加了对木质碎屑量的最佳定量估算。所提出的水文模式阈值可作为重要的预警指标，为漂浮木屑的提取作业做好准备。

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引用次数: 0

Seasonal and diurnal variations in turbidity in midwestern freshwater streams 中西部淡水溪流浊度的季节和昼夜变化

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-09 DOI: 10.1016/j.ejrh.2024.102044

Galina Shinkareva , Catherine M. O’Reilly , William L. Perry

Study region

Midwestern United States.

Study focus

Turbidity is a commonly used metric of water quality in streams and can be influenced by many factors. The objective of this study was to explore how turbidity changes on short, daily, timescales.

New hydrological insights for the region

Turbidity was measured at 15-minute intervals over a seven-year period in two watersheds in central Illinois. We documented diurnal turbidity cycles that were consistent and independent of discharge. Maximum daily levels occurred between 23:00 and 05:00, and minimum values occurred between 13:00 and 18:00, with night-time turbidity averaging 2.3 times higher than day-time turbidity values. The diurnal magnitude of turbidity change for Money and Six Mile Creeks tended to be significantly greater during June, July, August and September relative to other periods of the year. These months coincide with water temperatures above 10°C which suggests a potentially important role of biological activity as a main driver of diurnal turbidity changes. During this warm-water season, the diurnal turbidity magnitude also corresponded with the lunar cycles. Median nighttime turbidity values for warm months during lunar phases with lowest moonlight levels (new moon, waxing and waning crescent) were typically higher than during the phases with highest moonlight availability (full moon, waxing and waning gibbous), which may be related to nocturnal foraging and mating activities of fish, amphibians and bivalve species that inhabit both streams.

研究地区美国中西部.研究重点浊度是衡量溪流水质的常用指标，会受到多种因素的影响。这项研究的目的是探索浊度在短时间内（每天）的变化情况。对该地区水文的新见解在伊利诺伊州中部的两个流域，我们以 15 分钟的间隔测量了浊度，时间跨度长达七年。我们记录的昼夜浊度周期是一致的，且与排水量无关。每日最高浊度出现在 23:00 至 05:00，最低浊度出现在 13:00 至 18:00，夜间浊度平均是白天浊度的 2.3 倍。金钱溪和六英里溪的昼夜浊度变化幅度在 6 月、7 月、8 月和 9 月往往明显大于全年的其他时段。这些月份的水温都在 10°C 以上，这表明生物活动可能是昼夜浊度变化的主要驱动力。在这个暖水季节，昼夜浊度的大小也与月相周期一致。在月光水平最低的月相（新月、腊月和腊月新月）中，温暖月份的夜间浊度中值通常高于月光水平最高的月相（满月、腊月和腊月新月），这可能与栖息在这两条溪流中的鱼类、两栖动物和双壳类动物的夜间觅食和交配活动有关。

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引用次数: 0

Conceptual groundwater model of the north-eastern flanks of Mount Kenya 肯尼亚山东北侧地下水概念模型

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-09 DOI: 10.1016/j.ejrh.2024.101989

Manon Trottet , Hanspeter Liniger , Daniel Hunkeler , Philip Brunner

Despite serious concerns over declining river flows and prolonged dry spells in the north-eastern region of Mount Kenya and the Ewaso Ng’iro River watershed many aspects of the groundwater system remain unexplored. In particular, the recharge-discharge dynamics of the Ewaso Ng’iro River have not been studied, and no conceptual groundwater model currently links the recharge areas in the high-elevation humid regions to the drier lowlands. This study aims to address this significant knowledge gap by assessing the recharge-discharge dynamics of the Ewaso Ng’iro River and identifying the relevant groundwater subsystems and the main flow paths within the various lava layers constituting the aquifer system. Hydrochemical and stable isotope analyses revealed three distinct subsystems with slightly different chemistries and different recharge zones, all of recent meteoric origin. Groundwater from Mt. Kenya is of the HCO₃-Na-Mg-Ca type with no dominant cations, whereas groundwater from the Nyambene Range, the other surrounding volcanic hills in the area, is of the HCO₃-Na type. Groundwater in the third subsystem in between is of the HCO₃-Mg type and is confined or semi-confined. In this area, carbon-13 analysis showed a strong influence of mantle-derived CO₂ on the groundwater chemistry (very high electrical conductivity and left-shifted oxygen-18 ratios). Finally, major ions and stable isotopes (ẟ¹⁸O and ẟ²H) confirmed that during the dry season, the river is entirely groundwater-fed, with the Mt. Kenya subsystem contributing half of the maximum river flow rate of 800 l/s.

尽管肯尼亚山东北部地区和 Ewaso Ng'iro 河流域的河水流量下降和长期干旱问题令人严重关切，但地下水系统的许多方面仍未得到探索。特别是，埃瓦索-恩吉罗河的补给-排泄动态尚未得到研究，目前也没有概念性地下水模型将高海拔湿润地区的补给区与较干旱的低地联系起来。本研究旨在通过评估 Ewaso Ng'iro 河的补给-排泄动态，确定相关地下水子系统以及构成含水层系统的各熔岩层内的主要流动路径，从而填补这一重大知识空白。水化学和稳定同位素分析表明，有三个不同的子系统，其化学成分略有不同，补给区也不同，都是新近的流星水。肯尼亚山的地下水属于 HCO3-Na-Mg-Ca 类型，不含主要阳离子，而该地区周围另一座火山山丘 Nyambene 山脉的地下水则属于 HCO3-Na 类型。介于两者之间的第三个子系统的地下水属于 HCO3-Mg 类型，是封闭或半封闭的。在这一地区，碳-13 分析表明地幔源二氧化碳对地下水化学性质有很大影响（电导率非常高，氧-18 比值左移）。最后，主要离子和稳定同位素（ẟ18O 和 ẟ2H）证实，在旱季，河流完全由地下水提供，肯尼亚山子系统提供了 800 升/秒最大河流流量的一半。

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引用次数: 0

Potential impact of precipitation temporal structure on meteorological drought and vegetation condition: A case study on Qinghai-Tibet Plateau 降水时空结构对气象干旱和植被状况的潜在影响：青藏高原案例研究

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-08 DOI: 10.1016/j.ejrh.2024.102048

Houliang Lu , Jun Qiu , Bill X. Hu , Fangfang Li

Study region

Qinghai-Tibet Plateau (QTP).

Study focus

The Qinghai-Tibet Plateau (QTP) is sensitive to climate change and ecologically fragile. Researches on precipitation over the QTP mainly focus on quantity and frequency, overlooking its temporal distribution. However, subtle changes in precipitation can significantly impact the natural environment and lead to natural disasters. This work primarily focuses on the response of meteorological drought and vegetation growth to the precipitation temporal structure. The precipitation temporal structure is quantified from the perspectives of the contribution of heavy precipitation (concentration index, CI) and the temporal distribution of total precipitation (standardized variability index, SVI) using CPC unified gauge-based analysis of global daily precipitation over 1982–2022.

New hydrological insights for the regions

The CI and SVI exhibit a significant decreasing trend across almost the entire QTP, which means the temporal distribution of precipitation has become more "even" within a year. Meteorological drought was analyzed using the sc-PDSI and SPEI-12 indices. Both indices indicate that drought has intensified in both the humid regions (southeastern QTP) and arid regions (northern QTP). However, in the transition zone between dry and humid areas, drought conditions have shown signs of alleviation. Analysis of the vegetation indicates a greening trend across the QTP, particularly in the northeastern regions. CI is more superior than the SVI in characterizing vegetation growth, especially in the transitional zones between bare land and grassland where precipitation is sparse. The findings provide a scientific basis for vegetation restoration and drought risk management on the QTP.

研究地区青藏高原。研究重点青藏高原对气候变化敏感，生态环境脆弱。对青藏高原降水的研究主要集中在降水量和降水频率上，而忽略了降水的时间分布。然而，降水量的微妙变化会对自然环境产生重大影响，并导致自然灾害。这项工作主要关注气象干旱和植被生长对降水时间结构的响应。几乎在整个 QTP 中，CI 和 SVI 都呈现出明显的下降趋势，这意味着一年内降水的时间分布变得更加 "均匀"。利用 sc-PDSI 和 SPEI-12 指数对气象干旱进行了分析。这两个指数都表明，湿润地区（昆明热带雨林东南部）和干旱地区（昆明热带雨林北部）的干旱加剧。不过，在干旱和湿润地区的过渡地带，干旱状况有缓解迹象。对植被的分析表明，整个 QTP 地区，尤其是东北部地区，出现了绿化趋势。在表征植被生长方面，CI 比 SVI 更具优势，尤其是在降水稀少的裸地和草地过渡带。这些发现为瞿塘峡保护区的植被恢复和干旱风险管理提供了科学依据。

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引用次数: 0

An agent-based socio-hydrological modeling to identify the feedbacks between agricultural irrigation and ecological water conveyance tradeoffs in Hotan River basin 基于代理的社会-水文模型识别和田河流域农业灌溉与生态输水权衡之间的反馈作用

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-08 DOI: 10.1016/j.ejrh.2024.102028

Shunke Wang , Jie Xue , Jingjing Chang , Huaiwei Sun , Xinxin Li , Xin Liu

Study region

Hotan River basin in Northwest China

Study focus

The conflict between agricultural irrigation and ecological water conveyance is particularly critical in arid inland river basins. Water resource systems involve multiple stakeholders and sectors, complicating the identification of dynamic feedback between agriculture and ecology. This study presents an agent-based socio-hydrological modeling (ABSHM) framework to address these interactions.

New hydrological insights for the region

Feedback is quantified using dynamic state variable of oasis decision-making sensitivity in the Hotan River basin. When this sensitivity ranges from 0.03 to 0.06, water managers prioritize agricultural irrigation, increasing its usage from 8 to 47 million m³ at the expense of ecological water. Conversely, when sensitivity is from 0.015 to 0.03, ecological health requires increasing ecological water use from 27 to 66 million m³ by reducing irrigation. The ABSHM framework effectively captures these dynamic feedback processes, supporting basin water resources management and decision-making. The uniqueness of the ABSHM framework lies in its ability to capture the impact of individual decision-making behaviors on the overall water resource system. This offers new perspectives and approaches for addressing current and future water resource management challenges.

研究区域中国西北部的和田河流域研究重点农业灌溉与生态输水之间的冲突在干旱的内陆河流域尤为严重。水资源系统涉及多个利益相关者和部门，使农业与生态之间的动态反馈识别变得更加复杂。本研究提出了一个基于代理的社会-水文建模（ABSHM）框架，以解决这些互动问题。对该地区的新水文见解利用和田河流域绿洲决策敏感性的动态状态变量对反馈进行量化。当灵敏度在 0.03 到 0.06 之间时，水资源管理者会优先考虑农业灌溉，以生态用水为代价将农业灌溉用水量从 800 万立方米增加到 4,700 万立方米。相反，当灵敏度在 0.015 到 0.03 之间时，生态健康要求通过减少灌溉将生态用水量从 2700 万立方米增加到 6600 万立方米。ABSHM 框架可有效捕捉这些动态反馈过程，为流域水资源管理和决策提供支持。ABSHM 框架的独特之处在于它能够捕捉个体决策行为对整个水资源系统的影响。这为应对当前和未来的水资源管理挑战提供了新的视角和方法。

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引用次数: 0

Regional-scale seasonal forecast of surface water availability in a semi-arid environment: The case of Ceará State in Northeast of Brazil 半干旱环境中地表水供应的区域尺度季节性预测：巴西东北部塞阿拉州的案例

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-08 DOI: 10.1016/j.ejrh.2024.102058

Erwin Rottler , Martin Schüttig , Axel Bronstert , Alyson Brayner Sousa Estácio , Renan Vieira Rocha , Valdenor Nilo de Carvalho Junior , Clecia Cristina Barbosa Guimarães , Eduardo Sávio P.R. Martins , Christof Lorenz , Klaus Vormoor

Study region:

Ceará (Brazil).

Study focus:

Considerable intra- and inter-annual variability of rainfall in this semi-arid region lead to strong temporal variations in water availability. To store and supply water in times of water scarcity, tens of thousands of freshwater reservoirs have been built over time, most of which are unmonitored. Here, we develop a hydrological forecasting system for the entire state of Ceará which integrates satellite-based monitoring of reservoir water storage, bias-corrected seasonal weather forecasts and hydrological modeling of freshwater availability. We test and demonstrate the applicability of this system by conducting experiments with historic data, hindcasts and forecasts.

New hydrological insights for the region:

The assimilation of in-situ and Sentinel-1 based observations of reservoir fillings into the hydrological model WASA-SED proved to be feasible and an important step in the modeling of available water resources dynamics. Hydrological simulations for January to June from 1990–2019 based on meteorological observations resulted in a median average NRMSE between observed and modeled reservoir fillings of strategic reservoirs of 29.51%. The comparison of observed and predicted precipitation from two different seasonal forecasting systems were in the same order of magnitude (i.e. 19.51% and 24.52%). Hindcast experiments suggested the superposition of uncertainties of different model components. Efforts are currently being made to further test and improve the developed integrated framework as part of the operational service.

研究地区：塞阿拉（巴西）。研究重点：在这一半干旱地区，降雨量的年内和年际变化很大，导致可用水量在时间上变化很大。为了在缺水时储存和供应水源，长期以来建造了数以万计的淡水水库，其中大部分水库都没有受到监测。在此，我们为整个塞阿拉州开发了一套水文预报系统，该系统集成了基于卫星的水库蓄水监测、偏差校正季节性天气预报和淡水可用性水文模型。我们通过对历史数据、后报和预报进行实验，测试并证明了该系统的适用性。对该地区的新水文见解：事实证明，将基于原位和哨兵 1 号卫星的水库蓄水观测数据同化到水文模型 WASA-SED 中是可行的，也是可用水资源动态建模的重要一步。基于气象观测数据对 1990-2019 年 1-6 月的水文模拟结果表明，战略水库的观测水库蓄水量与建模水库蓄水量之间的平均无显著性差异（NRMSE）中位数为 29.51%。两个不同季节预报系统的观测降水量和预测降水量的比较结果处于同一数量级（即 19.51% 和 24.52%）。后报实验表明，不同模式组成部分的不确定性是叠加的。目前正在努力进一步测试和改进所开发的综合框架，将其作为业务服务的一部分。

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引用次数: 0

A novel structural equation modelling-based framework for identifying hydrometeorological multi-factor interaction 基于结构方程建模的新型水文气象多因素相互作用识别框架

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-07 DOI: 10.1016/j.ejrh.2024.102050

Zhongan Li , Xian Guan , Xizhi Nong , Ronghui Li , Lihua Chen , Jiahua Wei

Study region

The Hanjiang River Basin, China.

Study focus

In this study, we proposed a new integrated framework based on structural equation models to identify hydrometeorological multi-factor interaction relationship. The spatiotemporal distribution and interaction relationship of hydrological, meteorological, and vegetation indicators in the Hanjiang River Basin were analyzed based on the national long-series monitoring data.

New hydrological insights for the region

The findings reveal that: (1) The rainfall is the maximum in the lower reaches (968.87 mm), and the runoff depth fluctuated the most in the lower reaches (1181.70 mm to 2934.88 mm). (2) Dew point temperature is an important influencing factor of rainfall in the upper and middle reaches, and relative humidity is an important influencing factor of rainfall in the lower reaches. High vegetation cover is an important influencing factor for runoff depth. (3) Rainfall and runoff depth are significantly negatively affected by meteorological characteristics, with effect values ranging from −0.24 to −0.68. However, runoff depth is positively affected by rainfall, relative humidity, vegetation characteristics, and canopy interception, with effect values ranging from 0.02 to 0.58. The size and mode of influence have significant regional differences.

研究区域中国汉江流域。研究重点在本研究中，我们提出了一种基于结构方程模型的新型综合框架，以识别水文气象多因素相互作用关系。基于国家长序列监测数据，分析了汉江流域水文、气象和植被指标的时空分布和相互作用关系：(1) 下游降雨量最大（968.87 毫米），下游径流深波动最大（1181.70 毫米至 2934.88 毫米）。(2）露点温度是中上游降雨的重要影响因素，相对湿度是下游降雨的重要影响因素。植被覆盖率高是径流深度的重要影响因素。(3) 降雨量和径流深受气象特征的显著负向影响，效应值在-0.24 至-0.68 之间。然而，降雨量、相对湿度、植被特征和冠层截流对径流深度有正向影响，效应值在 0.02 至 0.58 之间。影响的大小和方式具有显著的地区差异。

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引用次数: 0

Risk assessment and sources associated with potentially toxic elements in suspended particulate matter: A karst river perspective in active mining area 与悬浮颗粒物中潜在有毒元素相关的风险评估和来源：从活跃矿区的喀斯特河流角度看问题

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-07 DOI: 10.1016/j.ejrh.2024.102052

Yeye Ren , Y.Jun Xu , Pan Wu , Jie Zeng , Changmei Yao , Guangxi Long , Xingxing Cao

Study region

Daiyang River Basin, a typical karst river basin impacted by mining activities in Guizhou, Southwest China.

Study focus

Rivers are fundamental components of regional water security, but they are facing potentially toxic elements (PTEs) pollution caused by mining activities. This study investigated the concentration, behavior, risks and sources of nine PTEs in suspended particulate matter (SPM) from mining-impacted karst rivers, which are essential for the safety and management of karst water environments.

New hydrological insights for the region

The contents of Cr, Ni, Cu, Zn, As, Cd, Sb and Hg exceeded the corresponding local soil background values, with Zn and Cu being the most important pollutants. These elements caused a very high potential toxicity risk to the basin and unacceptable carcinogenic and non-carcinogenic risks to the local residents. Correlation analysis and the positive matrix factorization (PMF) model indicated that Ni, Cd, Zn and Cu were mainly derived from mixed sources of geological background and anthropogenic activities (30.95 %), Hg, Sb, and As were related to coal mining and combustion sources (28.91 %), while Pb, As, Cr and Sb were mainly contributed by natural sources (40.15 %). Furthermore, mixed sources, mining-related sources and As were identified as priority control factors in the study area. These insights can provide powerful support for decision-makers to develop control policies and reduce PTEs pollution in karst areas.

研究重点河流是区域水安全的基本组成部分，但它们正面临着采矿活动造成的潜在有毒元素（PTEs）污染。本研究调查了受采矿活动影响的岩溶河流悬浮颗粒物 (SPM) 中九种潜在有毒元素的浓度、行为、风险和来源，这对岩溶水环境的安全和管理至关重要。这些元素对流域造成了极高的潜在毒性风险，并对当地居民造成了不可接受的致癌和非致癌风险。相关性分析和正矩阵因式分解（PMF）模型表明，镍、镉、锌和铜主要来自地质背景和人为活动的混合源（30.95%），汞、锑和砷与采煤和燃烧源有关（28.91%），而铅、砷、铬和锑则主要来自自然源（40.15%）。此外，混合源、采矿相关源和砷被确定为研究区域的优先控制因素。这些见解可为决策者制定控制政策和减少岩溶地区的 PTEs 污染提供有力支持。

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引用次数: 0

Geochemical fingerprints, evolution, and driving forces of groundwater in an alpine basin on Tibetan Plateau: Insights from unsupervised machine learning and objective weight allocation approaches 青藏高原高寒盆地地下水的地球化学指纹、演变和驱动力：无监督机器学习和客观权重分配方法的启示

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-05 DOI: 10.1016/j.ejrh.2024.102054

Hongjie Yang , Yong Xiao , Shaokang Yang , Zhen Zhao , Shengbin Wang , Shanhu Xiao , Jie Wang , Yuqing Zhang , Jianhui Wang , Youjin Yuan , Ning Wang , Liwei Wang , Wenxu Hu

Study Region

Tongde Basin, a typical alpine basin on the northeastern Tibetan Plateau

Study focus

Research on the hydrochemical pattern and availability of groundwater is very limited in alpine regions, which greatly hinders the rational ulitilization and scientific management of groundwater resources. Multiple approaches integrating self-organizing map, K-means, entropy weight were employed to elucidate the distinct hydrochemical evolution patterns and controlling mechanisms of groundwater in alpine basins with dense human activities.

New hydrological insights for the region

Multiple hydrochemical evolution patterns were discovered for groundwater in present alpine basin on northeastern Tibetan Plateau. Groundwater presents a gradual hydrochemical evolution from the piedmont to the riverside under the natural regulation with the increasing of TDS and major ions along the flow path. While, groundwater at some sporadic sites is featured with relatively high total alkalinity due to carbonate mineral dissolution. The riverine groundwaters are regulated by the strong hydrodynamic condition of river and demonstrate fresher hydrochemical characteristics. Groundwaters in the irrigation areas are featured by elevated nitrate levels with a maximum of 42.86 mg/L, attributed to agricultural pollution inputs. A conceptual model was established to illustrate the distinct hydrochemical fingerprints, evolution patterns and controlling mechanisms of groundwater in alpine basins that with dense human activities. This research can enhance the understanding of groundwater chemical status, genesis and availability, and is beneficial for the conservation and sustainable management of groundwater resources in ecologically fragile alpine regions worldwide.

研究区域青藏高原东北部典型的高寒盆地--同德盆地研究重点高寒地区地下水的水化学形态和可利用性研究十分有限，极大地阻碍了地下水资源的合理利用和科学管理。本研究采用自组织图、K-均值、熵权等多种方法，阐明了人类活动密集的高寒盆地地下水的水化学演化规律及其控制机制。对该地区水文的新认识在青藏高原东北部的高寒盆地发现了地下水的多种水化学演化规律。在自然调节作用下，地下水呈现出从山麓到江边的渐进式水化学演化过程，沿水流路径的 TDS 和主要离子含量不断增加。而在一些零星地点，由于碳酸盐矿物的溶解，地下水的总碱度相对较高。沿河地下水受到河流强大水动力条件的调节，表现出较新鲜的水化学特征。灌溉区地下水的特点是硝酸盐含量较高，最高达 42.86 毫克/升，这归因于农业污染输入。研究建立了一个概念模型，以说明人类活动密集的高山盆地地下水的独特水化学特征、演变模式和控制机制。这项研究可以加深人们对地下水化学状况、成因和可用性的了解，有利于全球生态脆弱的高寒地区地下水资源的保护和可持续管理。

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引用次数: 0

Identifying the pattern of shallow groundwater hydrochemistry and its driving factors in a typical estuarine delta of Poyang Lake watershed, China: Insights into water quality assessment 中国鄱阳湖流域典型河口三角洲浅层地下水水化学模式及其驱动因素识别：对水质评估的启示

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies

Pub Date : 2024-11-05 DOI: 10.1016/j.ejrh.2024.102049

Hongxiang Fan , Fan Song , Huawu Wu , Yao Du , Ruiyu Lei , Mengyao Ding , Kaiwen Li , Jing Li , Congsheng Fu

Study region

A typical estuarine delta of Gan−Xiu River within Poyang Lake watershed, situated in the north of Jiangxi Province, China

Study focus

Although groundwater is considered as a crucial water resource for social development and public health, it presents significant challenges in preventing the deterioration of groundwater quality in the seasonal floodplain regions. Hence, this study focuses on the spatiotemporal variations of ionic concentrations of shallow groundwater in an estuarine delta of Gan-Xiu River in Poyang Lake watershed, which is greatly complicated by complex hydrological regimes and intensive anthropogenic activities such as cropland fertilizer. The potential factors controlling the ionic concentrations were identified using self-organizing map clustering and Piper diagram approaches. Moreover, the overall water quality of shallow groundwater was assessed according to the ionic compositions.

New hydrological insights for the region

(1) Shallow groundwater chemistry was influenced by weathering silicate and carbonate from ionic and Gibbs plots, which is highly associated with the distribution of the carbonate rock fissure-karst aquifer in the study region. (2) The contribution of groundwater to river water varied from 53.2 % to 71.5 % via isotopic analysis, suggesting that groundwater dominate the component of river water. (3) Most samples from cluster types are suitable for drinking and irrigation use except for sites from Cluster 6, which were characterized by the higher concentrations of Cl⁻, NO₃⁻ and SO₄²⁻.

研究区域中国江西省北部鄱阳湖流域内典型的赣秀河口三角洲研究重点虽然地下水被认为是社会发展和公共卫生的重要水资源，但在防止季节性洪泛区地下水水质恶化方面却面临着巨大挑战。因此，本研究重点关注鄱阳湖流域赣秀河口三角洲浅层地下水离子浓度的时空变化。利用自组织图聚类法和 Piper 图法确定了控制离子浓度的潜在因素。对该地区水文的新认识（1）从离子图和吉布斯图来看，浅层地下水化学受风化硅酸盐和碳酸盐的影响，这与研究地区碳酸盐岩裂隙-喀斯特含水层的分布高度相关。(2) 通过同位素分析，地下水占河水的比例从 53.2%到 71.5%不等，表明地下水在河水成分中占主导地位。(3) 除了第 6 组的样本具有较高的 Cl-、NO3- 和 SO42-浓度外，其他组群类型的样本大多适于饮用和灌溉。

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