水力发电学报2016，Vol.35Issue(10)：48-57,10.DOI:10.11660/slfdxb.20161006
网格尺度及村庄糙率对滩区洪水演进模拟结果的影响
Impacts of mesh scale and village region roughness on predictions of flood inundation over complex floodplains
摘要
Abstract
A two-dimensional hydrodynamic model using a TVD finite volume method and unstructured triangular mesh is presented for prediction of the routing of overbank floods over complex floodplain topography.This model has been verified against the previously reported experimental data of dam-break flows in a laboratory flume,and a favourable agreement was achieved between the model predictions and measurements.We applied the verified model to an overbank flood event on a typical floodplain of the Lower Yellow River,and examined in detail the effects of mesh scale and village region roughness on the predictions.The results show that these two factors have influences of different degrees.Smaller mesh scales cannot achieve better results,but reasonable scales should be those that conform to the density of bed elevation points measured.Predictions of flood inundation by using center-hollowed village regions and different village roughness values were significantly different.In the center-hollowed case,an increase of up to 0.57 m in the maximum water depth was calculated,relative to the roughness modelling.An increase in village roughness from 0.06 to 0.12 caused an increase of 0.25 m in the maximum water depth and a reduction of 0.24 m/s in the flow velocity.Thus,in practical engineering applications,conceptualization and modelling of village regions and their roughness values should be determined according to real conditions.关键词
洪水演进/水动力学模型/网格尺度/村庄糙率/漫滩洪水Key words
flood inundation/hydrodynamic model/mesh scale/village roughness/overbank flood分类
建筑与水利引用本文复制引用
张晓雷,夏军强,李娜..网格尺度及村庄糙率对滩区洪水演进模拟结果的影响[J].水力发电学报,2016,35(10):48-57,10.基金项目
国家自然科学基金(51379156 （）
51579186) （）
水利部公益性行业科研专项经费项目(201401038 （）
201401023) （）
