摘要
为克服在防洪评价工作中常遇到复杂河道地形或者一些特殊的阻水构筑物,一维模型或常规的二维模型应用容易受到限制的问题,以滹沱河部分河段为例将基于非结构网格的具有良好激波捕捉能力的Godunov格式用于防洪评价。该河段中存在着大量的挖沙坑、桥墩、十多处丁坝,局部流态复杂。为充分考虑这些影响,建立了基于高分辨率地形的精细化二维Godunov水动力模型,并对该河段50年一遇的设计洪水进行了数值模拟。结果表明,新建模型能够很好地模拟复杂研究区域的水流状态,与商业软件的计算结果也比较接近。通过与原有该河段一维计算结果比较发现,项目区位置处水面高程降低了2.95 m,分析认为主要原因是河道地形变化所致,另一原因是新建模型能够提供更合理的计算结果。该研究案例表明基于Godunov格式的精细化二维水动力模型可成功用于复杂河道防洪评价,能够为同类型的防洪评价工作提供参考。
In order to overcome the problem of that complicated terrain of river channel or some special obstructive structures are often encountered during the assessment of flood control and then the applications of one-dimensional model or conventional 2-D model are prone to be limited,the non-structural grid-based Godunov-type scheme with better shock capturing capacity is applied to the assessment of flood control by taking apart reach of Hutuohe River as the study case. Within the river reach,a large amount of sand-mining pits,bridge piers and more than ten spur dikes are there,thus the local flow pattern therein is quite complicated. For fully considering these impacts,a high-resolution terrain-based refined 2-D Godunov hydrodynamic model is established,and then the design flood with the return-period of 50 years is numerically simulated for the river reach.The result shows that the newly built model can better simulate the flow pattern within the complicated study area,from which the calculated result is relatively closed to that from the relevant commercial software. Through comparing with the original calculation result from the one-dimensional calculation of the river reach,it is found out that the elevation of the water surface at the location of the project area is lowered by 2. 95 m; for which it is considered to be caused by the change of the terrain of the river channel through the relevant analysis,while the another causation is that the newly built model can provide a more reasonable calculation result. The study case indicates that the refined 2-D hydrodynamic model can be successfully applied to the assessment of the flood control of complicated river channel,thus can provide reference for the similar assessment of flood control.
作者
张大伟
穆杰
马建明
张洪斌
ZHANG Dawei;MU Jie;MA Jianming;ZHANG Hongbin(China Institute of Water Resources and Hydropower Research, Beijing 100038, China;Research Center on Flood ＆ Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China)
出处
《水利水电技术》
CSCD
北大核心
2018年第8期150-154,共5页
Water Resources and Hydropower Engineering
基金
国家重点研发计划(2017YFC1502602)
国家自然基金项目(51509263)
中国水科院基本科研业务费项目(JZ0145B772017)
关键词
防洪评价
二维水动力模型
Godunov格式
滹沱河
assessment of flood control
2-D hydrodynamic model
Godunov-type scheme
Hutuohe River
