地理科学 ›› 1983, Vol. 3 ›› Issue (2): 141-150.doi: 10.13249/j.cnki.sgs.1983.02.141

• 论文 • 上一篇    下一篇

珠江三角洲西江干流河床演变的近代过程

乔彭年   

  1. 广州地理研究所
  • 出版日期:1983-03-20 发布日期:1983-03-20

RECENT FLUVIAL PROCESS OF THE XIJIANG MAIN RIVER COURSE IN THE ZHUJIANG DELTA

Qiao Pengnian   

  1. Quangzhou Institute of Geography
  • Online:1983-03-20 Published:1983-03-20

摘要: 西江干流下游具有强径流与中等潮流的动力特性。汛期,径流作用处于完全控制的主导地位,但在枯水期,潮流势力又可深入到河口以上一百公里的距离。与珠江三角洲其它河口对比,西江口门具有径流及输沙最强而潮流最弱的特点,这对河口淤积发展是极为有利的条件。就整个珠江三角洲来说,西江来水来沙量均占绝对大的数量,所以它是形成整个珠江三角洲主要的动力和物质来源。因此,对西江下游河床演变规律的研究,无疑将有助于进一步认识整个珠江三角洲近代过程的问题。

Abstract: The main river course of Xijiang in the Zhujiang delta is characterized byalluvial process and closely connected with the evolution of the delta.Withregard to the fluvial process of the reach in recent period,only the threefollowing problems will be discussed in this paper:(1) The profile of the river bed has a very gentle gradient and greaterundulation in elevation.This is the result of interaction of many factors suchas hydrodynamics,sediments and boundary of the estuary during a long developing period of the delta thro ugh deposition.(2) The characteristics of deposition and erosion of the river are primarily demonstrated in:1.The cross section of the bed is more stable than theprofile.2.The secular trend of deposition interrupted by a short period oferosion and deposition.3.There are seasonal changes with erosion occurring inflood season and deposition in dry season.4.The cross section of the mouthtends to become narrower and deeper gradually.5.An adjustment of river hasoccurred due to the projects of the joining dykes and constructing sluices,landreclaimation from the sea and the controlling engineering of the mouth.(3) The oncoming sediment of Xijiang basin is the primary source ofthe material in forming the subaqueous delta offshore.For the present,thedelta is extending towards the Continental shelf.