生物絮凝泥沙运动输移数学模型  

Numerical modelling of bio-flocculated sediment transport

作　　者：赵慧明[1,2] 方红卫[3] 王崇浩[1,2] 池春青 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]流域水循环模拟与调控国家重点实验室,北京100048 [3]清华大学水利建筑工程系水沙科学与水利水电工程国家重点实验室,北京100084 [4]北京沃尔德防灾绿化技术有限公司,北京100048

出　　处：《水利学报》2015年第11期1290-1297,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(51479213);国家科技支撑计划项目(2013BAB12B01,2013BAB12B04);清华大学水沙科学与水利水电工程国家重点实验室开放研究基金资助课题(sklhse-2014-B-01)

摘　　要：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。The possible effects of bio-flocculated sediment transport on the river eco-system and hydraulicstructures have gradually become a research focus in recent decades. This paper focuses on the validationof the sediment transport module and its coupling with the mechanistic model of sediment bioflocculation（BFLOC） to build a 1D numerical model of bioflocculation sediment transport to predict the water leveland sediment concentration of biological flocculation sediment aggregates in nutrient- rich aqueous ecosys-tems. In the model,the flow is calculated by solving the Saint-Venant equations for one-dimensional un-steady flow. The biological flocculation of sediment is considered to be the main reason for the size chang-es of sediment flocculation. Biological flocculation sediment transport is simulated through the unsaturatednon-uniform sediment transport method. Validation of the bioflocculation sediment transport model is accom-plished through the simulation of one test case in experimental flume. The agreement with measurements isgenerally good.

关 键 词：生物絮凝泥沙 生物膜 一维数学模型 泥沙输移 

分 类 号：TV141[水利工程—水力学及河流动力学]