Water level updating model for flow calculation of river networks  

作　　者：Xiao-ling WU Xiao-hua XIANG Li LI Chuan-hai WANG 

机构地区：[1]College of Hydrology and Water Resources,Hohai University [2]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University [3]Zhenjiang Engineering Survey and Design Institute Co.,Ltd.

出　　处：《Water Science and Engineering》2014年第1期60-69,共10页水科学与水工程（英文版）

基　　金：supported by the Major Program of the National Natural Science Foundation of China(Grant No.51190091);the National Natural Science Foundation of China(Grant No.51009045);the Open Research Fund Program of the State Key Laboratory of Water Resources and Hydropower Engineering Science of Wuhan University(Grant No.2012B094)

摘　　要：Complex water movement and insufficient observation stations are the unfavorable factors in improving the accuracy of flow calculation of river networks. A water level updating model for river networks was set up based on a three-step method at key nodes, and model correction values were collected from gauge stations. To improve the accuracy of water level and discharge forecasts for the entire network, the discrete coefficients of the Saint-Venant equations for river sections were regarded as the media carrying the correction values from observation locations to other cross-sections of the river network system. To examine the applicability, the updating model was applied to flow calculation of an ideal river network and the Chengtong section of the Yangtze River. Comparison of the forecast results with the observed data demonstrates that this updating model can improve the forecast accuracy in both ideal and real river networks.Complex water movement and insufficient observation stations are the unfavorable factors in improving the accuracy of flow calculation of river networks. A water level updating model for river networks was set up based on a three-step method at key nodes, and model correction values were collected from gauge stations. To improve the accuracy of water level and discharge forecasts for the entire network, the discrete coefficients of the Saint-Venant equations for river sections were regarded as the media carrying the correction values from observation locations to other cross-sections of the river network system. To examine the applicability, the updating model was applied to flow calculation of an ideal river network and the Chengtong section of the Yangtze River. Comparison of the forecast results with the observed data demonstrates that this updating model can improve the forecast accuracy in both ideal and real river networks.

关 键 词：plain river network cyclic looped channel network water level updating model hydrodynamic model  error correction 

分 类 号：P333[天文地球—水文科学]