河流底泥冲刷沉降对水质影响的研究

The organic pollution in water environment is important domain to research about environment protection over the world. Especially, the status is more severe for the plain river network in China. A lot of organic and inorganic oxygen consumed pollutants are contained in bottom sediment of the plain river network , the bottom sediment is a non-negligible important pollution source affecting water quality.Through experimental investigation and theoretical analysis in this project, the results obtained will be take as follow. First of all, the experiment investigation on the pore water of bottom sediment was carried out. The result showed that the contaminant (COD) dissolving in pore water and adsorbing on surface of sediment particle through adsorption/desorption balance is most part of the contaminant in bottom sediment. The environment temperature and deposition duration of bottom sediment are significant factors affecting organic contaminant concentration in pore water. .Based on theoretical analysis, a new velocity profile formula of jet was proposed to unit the initial, transitional, fully developed regions. The flow velocity distribution on the rive bottom under the action of ship propeller was researched by using the jet formula,. Then the scour rate and scour areas of the bottom sediment were studied. .The contaminant (COD) model on the pore water in bottom sediment was proposed first. The model adding a COD creating term differs from other ADS model. The model was used to simulative calculating, and the parameters in it was analyzed..A new water quality model, which mainly is influenced by scouring resuspension of bottom sediment, was proposed. It takes all factors into account and includes the organic contaminant releasing in pore water and on the surface of bottom sediment particles. The calculation ways of each factor of the model were given. .

研究平原河网底泥污染（主要是有机污染物及无机耗氧物质）及其对水质影响的规律。重点研究不同条件（自然条件或人为条件）下河流底泥冲刷沉降对水质影响的规律。通过理论推导、实验研究，建立平原河网中反映底泥冲刷沉降产污影响的水质模型及水环境容量模型。进行模拟预测计算，分析底泥冲刷沉降再悬浮对河网水质及水环境容量的影响。