摘要
本文在一维河床动力学模型的基础上，增加了构造运动项，写出了考虑构造运动的河床动力学模型。并根据协同学原理，分析了不同活动强度的构造运动对河流纵剖面作用的情形和数量关系。最后以黄河下游河道为例，讨论了构造运动在河流纵剖面调整中的作用。
Firstly, for the purpose of studying the integrated effects of many factors on river-bed profile.we considered to put neotectonic movement into the river-bed dynamics model. We got a mathematical model of river-bed dynamics which includes neotectonic movement.Then we studied the effects of different neotectonic movements on river-bed profile and sediment transportation. Some quantitative relations and expressions are studied and gived. For example. the relation between a small quantity of tectonic movement δT and the thickness of deposits δZs. induced by δT' is that δZs. equals to T. but the signs are differandt Because the change of river-bed profile δZb = δZs +δT= (-δT) +δT=0. δT has no effect on river-bed profile.At last, we distinguished the neotectonic movement at the Lower Yellow River. The neotectonic falling is about 5 mm/a at the Lower Yellow River. Acording to the analysis above. it is clear that the neotectonic movement has no obvious effects on the river-bed profile at the Lower Yellow River, but it has obvious effects on the sediment transportation. There must be an equal quantity of deposits to compensate the neotectonic falling as great as 5mm/a.
出处
《地理学报》
CSSCI
CSCD
北大核心
1994年第4期324-331,共8页
Acta Geographica Sinica
关键词
构造运动
河流
河道冲淤
数学模型
Neotectonic movement, river-bed profile, river-bed dynamics, mathematical model, the Lower Yellow River
