| 赵慧明,方红卫,王崇浩,池春青.生物絮凝泥沙运动输移数学模型[J].水利学报,2015,46(11):1290-1297 |
| 生物絮凝泥沙运动输移数学模型 |
| Numerical modelling of bio-flocculated sediment transport |
| 投稿时间：2015-04-02 |
| DOI：10.13243/j.cnki.slxb.20150363 |
| 中文关键词: 生物絮凝泥沙 生物膜 一维数学模型 泥沙输移 |
| 英文关键词: bioflocculation sediment biofilm 1D numerical model sediment transport |
| 基金项目: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) |
|
| 摘要点击次数: 3214 |
| 全文下载次数: 60 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| The possible effects of bio-flocculated sediment transport on the river eco-system and hydraulic structures have gradually become a research focus in recent decades. This paper focuses on the validation of 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 level and sediment concentration of biological flocculation sediment aggregates in nutrient-rich aqueous ecosystems. In the model, the flow is calculated by solving the Saint-Venant equations for one-dimensional unsteady flow. The biological flocculation of sediment is considered to be the main reason for the size changes of sediment flocculation. Biological flocculation sediment transport is simulated through the unsaturated non-uniform sediment transport method. Validation of the bioflocculation sediment transport model is accomplished through the simulation of one test case in experimental flume. The agreement with measurements is generally good. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|