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近几十年来,河流中生物絮凝泥沙的运动输移对河流生态系统与水工建筑物等造成的影响,已逐渐成为一个研究热点。本文将泥沙运动输移模型与生物絮凝机理模型耦合起来,构建生物絮凝泥沙运动输移数学模型,以预测富营养水生态系统中生物絮凝泥沙运动输移过程中的浓度及水位变化。模型中,通过求解一维非恒定流圣维南方程来计算水流,将生物絮凝视为导致悬浮泥沙絮团粒径变化的主要因素,通过不饱和非均匀输沙(泥沙/絮团)方法来模拟生物絮凝泥沙的运动。利用文献数据和室内水槽实验来验证生物絮凝泥沙运动输移数学模型,模拟结果与实验数据吻合较好,表明所构建的一维数学模型可以较好地模拟生物絮凝泥沙的输移特性。
In recent decades, the impact of the transport of biological flocculation sediment in rivers on the river ecosystem and hydraulic structures has gradually become a research hotspot. In this paper, the transport model of sediment transport and the biological flocculation mechanism model are combined to build a mathematical model of biological flocculation and sediment transport in order to predict the concentration and water level changes of biological flocculation and sediment transport in the eutrophic aquatic ecosystem. In the model, the water flow was calculated by solving the one-dimensional unsteady flow Shengweinan equation, and the biological flocculation was regarded as the main factor leading to the change of particle size of the suspended sediment flocs. Through the unsaturated non-uniform sediment transport (silt / floc) Method to simulate the biological flocculation of sediment movement. The mathematical model of biological flocculation and sediment transport was validated by literature data and indoor sink experiments. The simulation results agree well with the experimental data, indicating that the constructed one-dimensional mathematical model can better simulate the transport characteristics of biological flocculation sediment.