A soil erosion-based framework for assessing mercury nonpoint pollution in mining watersheds

IF 6.3 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-09-22 DOI:10.1016/j.jhydrol.2025.134309

Xianwu Zheng , Kouping Chen , Bowen Luo , Jichun Wu , Huali Chen , Lei Xiang

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引用次数: 0

Abstract

In the Wanshan mining watershed, erosion is an important surface process transporting mercury contaminants from soil to river, posing substantial pollution risk to ecosystem. The erosion-driven mercury pollution is influenced by rainfall, soil erodibility, vegetation coverage, topography, mercury pollutant, and human activity. Quantifying the contribution of these factors is vital to evaluate erosion-driven mercury pollution. Previous studies over-relied on expert-based subjective method to assess factor contributions, yielding discrepancies between mercury pollution risk and observed fluvial contamination. Here, this study applied the CRITIC method to quantify objective factor contributions. Results indicate that rainfall, human activity, and mercury pollutant predominantly determine pollution risk, with contribution of 28 %, 20 %, and 18 %, respectively. Based on objective contribution results, we develop a novel risk index to evaluate mercury pollution. The evaluated mercury pollution risk and observed fluvial mercury contamination show a consistent distribution pattern. These findings provide effective reference for pollution control within mining watersheds.

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基于土壤侵蚀的采矿流域汞非点源污染评估框架

在万山矿区流域，侵蚀是将汞污染物从土壤转移到河流的重要地表过程，对生态系统造成了巨大的污染风险。侵蚀型汞污染受降雨、土壤可蚀性、植被覆盖度、地形、汞污染物和人类活动的影响。量化这些因素的贡献对于评估侵蚀驱动的汞污染至关重要。以往的研究过度依赖以专家为基础的主观方法来评估因素贡献，导致汞污染风险与观察到的河流污染之间存在差异。本研究采用CRITIC方法量化客观因素的贡献。结果表明，降雨、人类活动和汞污染物对污染风险的贡献率分别为28%、20%和18%。基于客观贡献结果，提出了一种新的汞污染风险评价指标。评价的汞污染风险与实测的河流汞污染呈现一致的分布格局。研究结果为矿区流域污染治理提供了有效参考。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.