Dynamic analysis of non-point source pollution in the Sanhekou Reservoir watershed: Implications for sustainable water management

IF 2.7 4区 环境科学与生态学 Q2 ECOLOGY
Ruikang Xue , Tinglin Huang , Gang Wen , Kai Li , Nan Li , Kangzhe Huang , Gang Ji , Yi Hou
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Abstract

Exogenous pollution, especially non-point source pollution runoff during a flood season, is an important factor affecting the water quality of reservoirs. The Sanhekou Reservoir (Shaanxi, China) is a newly dammed water body, so its non-point source pollution characteristics are unknown. In this study, three major tributaries of the Sanhekou Reservoir watershed were sampled during five rainfall-runoff events in the 2022 flood season. This enabled study of the transport processes of nitrogen, phosphorus, and suspended particles in the runoff under different rainfall conditions. Using hysteresis and redundancy analyses, the sources and transport modes of pollutants are explored here, alongside analysis of rainfall and hydrological characteristics that affect pollutant concentrations, and exploration of land-use relationships. The results showed that (i) nitrate nitrogen and particulate nitrogen were the main forms of nitrogen output, and particulate phosphorus was the main form of phosphorus output. (ii) Total nitrogen, suspended particles, total phosphorus, and particulate phosphorus were significantly affected by maximum rainfall intensity, average rainfall intensity, and average flow rate, whereas nitrate nitrogen and ammonia nitrogen were significantly affected by rainfall duration, rainfall amount, and rainfall-runoff duration. (iii) If 70 % of barren land and cultivated land with slope >15° were converted to forests, total nitrogen, total phosphorus, and suspended particulate loads in the Sanhekou Reservoir would be reduced during the flood season by 10.37 %, 33.01 %, and 45.39 %, respectively. The factors influencing migration and transformation of pollutants during rainfall runoff are important for operational scheduling decisions of reservoirs and guaranteeing quality of the water supply.
三河口水库流域非点源污染动态分析:对可持续水资源管理的影响
外源污染尤其是汛期非点源污染径流是影响水库水质的重要因素。陕西三河口水库是新筑坝的水库,其非点源污染特征尚不清楚。本研究选取了2022年汛期三河口水库流域的3条主要支流进行了5次降雨径流事件的采样。这使得研究不同降雨条件下径流中氮、磷和悬浮颗粒的运移过程成为可能。利用滞后和冗余分析,本文探讨了污染物的来源和运输方式,同时分析了影响污染物浓度的降雨和水文特征,并探讨了土地利用关系。结果表明:(1)硝态氮和颗粒态氮是氮输出的主要形式,颗粒态磷是磷输出的主要形式。(ii)总氮、悬浮粒子、总磷和颗粒磷受最大降雨强度、平均降雨强度和平均流量的显著影响,硝态氮和氨氮受降雨持续时间、降雨量和雨径流持续时间的显著影响。③退耕还林后,三河口水库汛期总氮、总磷和悬浮粒子负荷分别减少10.37%、33.01%和45.39%。降雨径流中污染物迁移转化的影响因素对水库运行调度决策和保障供水质量具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ecohydrology & Hydrobiology
Ecohydrology & Hydrobiology Agricultural and Biological Sciences-Aquatic Science
CiteScore
5.40
自引率
3.80%
发文量
51
期刊介绍: Ecohydrology & Hydrobiology is an international journal that aims to advance ecohydrology as the study of the interplay between ecological and hydrological processes from molecular to river basin scales, and to promote its implementation as an integrative management tool to harmonize societal needs with biosphere potential.
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