摘要
采用平面二维河流数学模型,系统研究概化河道的河型转化过程及其控制因素,成功模拟得到了初始比降、流量、入口含沙量增大和河岸抗冲性减弱时,河流从弯道向分汊、游荡河型转化的过程。根据模拟得到的河道平面形态、横断面形态、河床纵剖面,沿程水面线及沿程输沙率的变化,分析了河床初始比降、入口含沙量、流量和河岸抗冲性等各种因素对河型转化的影响。结果表明,模型计算得到的河型转化过程,与经典的河型成因及河型转化理论给出的趋势较为一致。
An improved two dimensional（2-D） numerical model for river flow,sediment transport and bank erosion is presented and tested in Part I of this paper series.Using the 2-D model,a series of numerical experiments are further carried out in an idealized river channel with different variations of channel patterns in this study.The impact on channel pattern changes by various factors,such as initial channel slope,sediment supply,water discharge,and resistance to bank erosion is studied using the model simulations.The numerical results of river channel planform change,longitudinal bed profile,channel cross section,water surface profile and channel sediment transport are analyzed and discussed.The channel patterns simulated by the improved 2-D model agree well with the classic theory of channel pattern formation.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2010年第2期153-160,共8页
Advances in Water Science
基金
国家自然科学基金资助项目(50879042)
"十一五"国家科技支撑计划资助项目(2006BAB05B03)~~
关键词
河型转化
数值模拟
河岸抗冲性
输沙率
分汊河道
channel pattern changes
numerical simulation
resistance to bank erosion
sediment delivery rate
braided channel
