摘要
阐述了黄河下游枯水少沙系列、丰水少沙系列河势演变情况,指出了河势演变的特点,并总结了河势演变基本规律:①河势自然演变的程度同来水来沙变幅成正比;②河床的可动性决定河势演变的剧烈程度;③主流线的弯曲系数、弯道半径自上而下呈增大趋势;④河势的演变具有关联性,具体表现为"一弯变、多弯变";⑤主流线有"小水坐弯、大水趋直"的特点;⑥节点及人工边界对河势的演变具有限制作用。
Analysis of the data measured in low flow and sediment load regimes and high flow regime and low sediment load regime in the lower Yellow River leads to the understandings of the law governing the changes in plane-forms of the wandering Yellow River,which are,among others,are a) that the extent of the change of planeform in nature is in direct proportion to the ranges of the flow and sediment load variations;b) that the amplitude of the plane-form change is dependent on the bed erodibility;c) that channel curvature and the bend radii tend to increase downstream;d) that there is a strong linkage between the changes of the downstream and the upstream channels,exemplified by change in one bend leading to numerous changes in the other bends;e) that main streamline tends to get bent during low flow and get relatively straight during high flow;f) that bank nodes and man-made boundary restrain the plane-form changes.
出处
《人民黄河》
CAS
北大核心
2009年第5期26-27,共2页
Yellow River
基金
国家自然科学基金委员会
水利部黄河水利委员会黄河联合研究基金重点项目(50339020-1-1)
关键词
枯水少沙
丰水少沙
河势演变
游荡型河段
黄河下游
low flow and sediment load regimes
high flow regime and low sediment load regime
plane-form changes
wandering reach
the lower Yellow River
