断面插值对山区河道水面线计算的适宜性分析  

Suitability Analysis of Cross-sectional Interpolation for Calculating Water Surface Profile in Mountainous River Channels

作　　者：程贝 胡豫英 CHENG Bei;HU Yuying(Hubei Jinlang Survey And Design Co.,Ltd,Wuhan 430070,China;Pearl River Hydraulic Research Institute,Pearl River Water Resources Commission,Guangzhou 510611,China)

机构地区：[1]湖北金浪勘察设计有限公司,湖北武汉430070 [2]珠江水利委员会珠江水利科学研究院,广东广州510611

出　　处：《人民珠江》2024年第8期121-127,共7页Pearl River

基　　金：水利部重大科技项目(SKR-2022038)。

摘　　要：河道水面线计算是山区河道治理等项目中不可或缺的部分。美国开发的HEC-RAS软件在河道水面线计算中的应用研究已有很多,但很少提及山区河道断面距较大、断面数量有限时,软件断面插值对计算结果的影响。利用HEC-RAS软件,结合北京市怀柔区山区河道菜食河的DEM高程数据,在基础断面、插值断面以及加密断面3个工况下分别建立了10、20、50一遇3种重现期下的河道水面线。结果表明:对于河道顺直、河道断面形式和河底高程变化不大的山区河道,插值计算能提高计算精度;对于河道不规则、河道断面形式和河底高程变化较大的山区河道,插值计算的误差较大,且重现期对水位的影响具有不确定性。Calculating the water surface profile of river channels is an indispensable part of projects such as river channel management in mountainous areas.While the application of the HEC-RAS software developed in the United States in the calculation of river water surface profiles has been extensively studied,little attention has been paid to the impact of software cross-section interpolation on the calculation results when the distance between cross-sections in mountainous river channels is large and the number of cross-sections is limited.In this study,using HEC-RAS software and DEM elevation data of the mountainous river,Caishi River in Huairou District,Beijing,water surface profiles of the river for recurrence intervals of 10,20,and 50 years are established under three scenarios including base cross-sections,interpolated cross-sections,and dense cross-sections.The results indicate that for mountainous river channels with relatively straight courses and little variation in cross-sectional forms and bed elevations,interpolation calculations can enhance accuracy.However,for mountainous river channels with irregular courses and significant variations in cross-sectional forms and bed elevations,interpolation calculations result in larger errors,and the uncertainty of recurrence intervals has an impact on water levels.

关 键 词：水面线 HEC-RAS 断面插值 

分 类 号：TV1471[水利工程—水力学及河流动力学]