A type of dynamic mechanism of river hydraulic geometry  

作　　者：BAI YuChuan JI ZiQing ZHANG MingJin 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University [2]Tianjin Research Institute for Water Transport Engineering, Key Laboratory of Engineering Sediment of Ministry of Transport

出　　处：《Science China(Technological Sciences)》2014年第4期847-855,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51279124,50979066,51009105);the Natural Science Foundation of Tianjin(Grant No.12JCQNJC05600)

摘　　要：Large-sczde structure of river flow is the main driving force for bed erosion-deposition and bank delbrmation. The structure shapes and retains a corresponding hydraulic geometry form. Therefore, the most stable flow structure is the probable natural river plane formation. Natural coordinate transformation and perturbation methods were adapted to deform the governing equations of sine-generated river basic flow and disturbance flow independently. The stability and retention of perturbation waves were analyzed in our model to explain why meandering rivers followed a certain type of tqow path. Computation results showed that all types of perturbation waves in meandering rivers were most stable when the meandering wave number was about 0.39-0.41. We believe that this type of stable flow structure shaped a certain meandering river. The statistical average length-width ratios of Yalin, Habib and da Silva and Leopold and Wolman somewhat confirmed our most stable river mean- dering wave number. In some ways, meandering rivers always tend to diminish internal turbulence intensity.

关 键 词：meandering river STABILITY coherent disturbance river optimization 

分 类 号：TV131[水利工程—水力学及河流动力学]