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Modelling critical source areas in an agricultural watershed

机译:在农业流域中对关键源区域进行建模

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摘要

Water pollution is the main threat to sustainable environmental and social-economic development in Taihu basin, China. To resolve conflicts between population growth and food supply, high-efficiency agricultural practices were implemented with the benefit of the reduction of farming lands and an increase in food production. As a consequence, large amounts of fertilizers were consumed, which resulted in serious diffuse pollution from agriculture in the region. The fate of this diffuse agricultural pollution is closely related to hydrologic processes. The hydrologic response mechanisms are the basis for understanding diffuse pollutant transport. A distributed hydrologic model system (HMS) which couples various components of the watershed hydrologic cycle such as surface water, channel water, soil water and groundwater, as well their interactions, was used to simulate various hydrologic processes in the Meilin watershed. Driven by the distributed hydrologic model, the diffuse pollution forecasting model was established by simplifying nitrogen (N) and phosphorous (P) dynamics. The model showed good simulation results and obtained the distribution of the critical source areas of total nitrogen (TN) and total phosphorous (TP) export in the Meilin watershed. The research results provide a scientific basis for the effective control of agricultural diffuse pollution in the Taihu basin.
机译:水污染是对中国太湖流域可持续环境和社会经济发展的主要威胁。为了解决人口增长与粮食供应之间的冲突,在减少耕地和增加粮食产量的情况下实施了高效的农业做法。结果,消耗了大量的肥料,导致该地区农业的严重扩散污染。这种分散的农业污染的命运与水文过程密切相关。水文响应机制是了解污染物扩散的基础。分布式水文模型系统(HMS)结合了流域水文循环的各个组成部分,例如地表水,河道水,土壤水和地下水,以及它们之间的相互作用,用于模拟梅林流域的各种水文过程。在分布式水文模型的驱动下,通过简化氮(N)和磷(P)的动力学过程建立了扩散污染预测模型。该模型显示了良好的模拟结果,并获得了梅林流域总氮(TN)和总磷(TP)出口的关键源区域的分布。研究结果为有效控制太湖流域农业扩散污染提供了科学依据。

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