平原河流地区经济发达，人口众多，水环境问题突出；水资源时空分布不均，河网密布，以过境水为主，水沙运动复杂；地势低洼，水动力条件不足，水体自净能力弱；泥沙颗粒细，对污染物的亲和力强，污染物的输运复杂。这些特点给河流水环境的治理和保护带来了极大的困难。因此，平原河流水沙运动对污染物的输运作用机理是治理和保护水环境亟待解决的关键科学问题。此外，平原河流闸坝泵站众多，为水环境调控提供了条件。本项目拟选用淮河为研究对象，采用野外调查、现场观测、室内实验和理论分析相结合的方法，开展泥沙颗粒与污染物微界面动力学问题，水沙运动对污染物的输运作用机理，植被、沙波等不同边界条件对污染物迁移影响，及平原河流水沙过程对污染物作用规律与环境效应研究，建立水沙与污染物动态耦合模型，提出联合利用闸、坝、泵的水沙-污染物环境调控对策和措施。成果将丰富和完善河流泥沙对污染物输运作用的理论，为平原河流水环境管理提供科学依据。

Plain river region has the characteristics of highly developed economy,large population and serious pollution. Therefore, the water environment problem is more crucial there. In these area, the spatial and temporal distribution of water resources is very uneven, river network is dense and the hydrodynamic condition is weak and self-purification capacity of water is poor. Meanwhile, the sediment particles in plain river are fine and may change the transport of pollutants due to their strong adsorption capacity. These bring great difficulties to the management and protection of the river water environment. Therefore, the mechanism of action of plain river flow and sediment transport on the pollutant is a key scientific issues of governance and protection of plain river water environment to be solved. However, there are many gates, dam and pumping station in the plain rivers, providing convenient conditions for the adjustment of water and sediment processes, and thus bring a way to solve the water environment in the plains. The project intends to use the field investigation, field observations, laboratory experiments and theoretical analysis, to find out the mechanism of action of flow and sediment movement on pollutant transport and environmental effects induced by this complicate process.. Control strategies and measures will be also found out. The research results will help enrich and improve the river sediment-pollutant theory and research methods, provide the scientific basis for environmental management of river water.