山丘-平原圩区复合型流域河流浊度时空演化模拟

高浊度日益成为影响水体感官，制约南方城乡河网地区水环境深度改善的瓶颈。针对太湖南部山丘-平原圩区复合型流域—西苕溪中下游长期浑浊问题，拟开展流域水文水质多要素监测，揭示浊度与影响因素复杂关系，构建高精度悬浮物-浊度关系模型；突破流域、河网水文水动力与水体浊度光学特性综合模拟的关键耦合技术，集成和优化流域悬浮物SWAT模型（山丘区）-PHPS改进模型（平原圩区）-MIKE11模型（河网水动力）与悬浮物-浊度关系模型，研发基于复合型流域水文水动力过程的河流浊度动态模型；基于近40年来流域悬浮物与浊度变化过程模拟，剖析浊度、悬浮物的时空演化特征与驱动机制，明确其时空分异的关键水文地理驱动因子及阈值，识别水体浑浊的关键污染源区与热点时间。该研究可望为山丘-平原圩区复合型流域河流浊度预测评估提供有力工具，并为靶向性的流域水环境深度改善提供科学依据。

High turbidity has increasingly become a bottleneck that affects the sense of water body and restricts the deep improvement of water environment in southern China. First, a hydrology and environment monitoring with multi-elements will be conducted in a typical hillslope-polder mixed catchment of Xitiaoxi with turbid water. The relationship between the turbidity and environmental factors will be analyzed and then a stable and significant total suspended solids-turbidity relationship model will be provided. Secondly, an integrated watershed hydrological and hydrodynamic modelling approach will be developed for describing turbidity processes in the complex catchments by coupling four models: SWAT (hillslope model), PHPS (polder model), MIKE 11(river hydrodynamic model) and total suspended solids-turbidity relationship models and. Thirdly, Based on the simulation results of total suspended solids and turbidity over the past 40 years, the spatio-temporal evolution of turbidity and total suspended solids and their hydro-geographic driving factors will be analyzed. The key source areas and hot times of total suspended solids and turbidity will then be identified. This study will give a powerful tool for predicting and assessing the river turbidity and total suspended solids in the hillslope-floodplain polder mixed catchment, and provide support for the deep improvement of the water environment of the watershed.