地理学报 ›› 1994, Vol. 61 ›› Issue (4): 324-331.doi: 10.11821/xb199404005

• 论文 • 上一篇    下一篇

构造运动影响河流纵剖面及河道冲淤的数学模型

贾绍凤   

  1. 中国科学院地理研究所
  • 收稿日期:1993-05-01 修回日期:1994-01-01 出版日期:1994-07-15 发布日期:1994-07-15

A STUDY ON THE MATHEMATICAL MODEL OF RIVER-BED DYNAMICS WHICH INVOLVES NEOTECTONIC MOVEMENT

Jia Shaofeng   

  1. Institute of Geography. Chinese Academy of Sciences and State Planning Commision, Beijing. 100101
  • Received:1993-05-01 Revised:1994-01-01 Online:1994-07-15 Published:1994-07-15

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。

关键词: 构造运动, 河流纵剖面, 河床动力学, 数学模型, 黄河下游

Abstract: 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. 

Key words: Neotectonic movement, river-bed profile, river-bed dynamics, mathematical model, the Lower Yellow River