河床枯萎的临界阈研究  

On the threshold of river channel shrinkage

作　　者：陈东[1] 曹文洪[1] 胡春宏[1] 

机构地区：[1]中国水利水电科学研究院泥沙研究所,北京100044

出　　处：《水利学报》2002年第2期22-28,35,共8页Journal of Hydraulic Engineering

基　　金：国家重点基础研究发展规划资助项目G19990 436 0 4

摘　　要：本文首先从河流地貌临界学说的观点出发 ,解释了河床枯萎的概念 .然后 ,以黄河下游近期河床演变特性为例 ,阐释了河床枯萎的机理以及由此带来的“小水大灾”效应 ,研究了造床流量、河相关系在新的水沙条件下的变化规律 ,提出了枯萎造床流量的概念 .最后 ,运用河道水沙数学模型 。Based on the principle of geomorphic threshold and analysis of field data, a conceptual model of river channel shrinkage is established. The evolution of the Lower Yellow River is considered as an example to demonstrate the mechanism of shrinkage and to explain the cause of serious disaster happened during minor flood. The dominant discharge for channel formation and relationship between dominant discharge and channel morphology under the condition of shrinkage are studied. Finally, some external thresholds of the channel shrinkage for Lower Yellow River are determined according to the mathematical model.

关 键 词：地貌临界 河床枯萎 河床流量 河相关系 数学模型 临界阈 

分 类 号：TV147.2[水利工程—水力学及河流动力学]