摘要
通过引入水深连接方程,耦合了干、支流河道的水流运动,给出了它们的流量分配关系,建立了交汇、分流河道洪水演进模型· 对交汇河道中水流顶托作用随河道参数的变化规律进行了研究· 分析了干、支流洪峰遭遇现象。
By introducing a water depth connecting formula, the hydraulic equations in the dividing channel system were coupled and the relation of discharge distribution between the branches of the dividing channels can be yielded. In this manner, a numerical model for the confluent channels was established to study the variation of backwater effects with the parameters in the channel junction. The meeting of flood peaks in the mainstream and tributary can be analyzed with this model.The flood peak meeting is found to be a major factor for the extremely high water level in the mainstream during the 1998 Yangtze River flood. Subsequently the variations of discharge distribution and water level with channel parameters between each branch in this system were studied as well. As a result, flood evolution caused by Jingjiang River shortcut and sediment deposition in the entrance of dividing channels of the Yangtze River may be qualitatively elucidated.It is suggested to be an effective measure for flood mitigation to enhance regulation capability of reservoirs available upstream of the tributaries and harness branch entrance channels.
出处
《应用数学和力学》
EI
CSCD
北大核心
2004年第12期1220-1229,共10页
Applied Mathematics and Mechanics
基金
国家自然科学重点基金资助项目(10332050)
国家自然科学基金资助项目(10002023)
关键词
交汇河道
分流河道
顶托作用
洪峰遭遇
长江
confluent channels
dividing channels
backwater effect
flood peak meeting
the Yangtze River
