摘要
闽江口2.0万吨级入海航道在口外有2处拦门沙,即内沙与外沙。在以陆域来沙为主的河口中,该类型河口有一定的代表性。探讨以下两方面的问题:1)根据外沙的地形、水流、河型以及实测水文、泥沙等资料,对外沙的成因进行分析。结论是:弯道环流是外沙的主要成因。2)通过对1886—1986年河口实测地形图的分析,并结合外沙地区泥沙淤积过程的演绎,提出"水流具有自动转换阻力特性"的概念,初步从理论层面诠释了主流改道分汊的机理,并给出改道的条件。
There＇ re two bars outside the entrance of Minjiang river 0. 2 million DWT entrance channel, i. e. the inner bar and the outer bar. It is a representative river estuary at which sand mainly comes from the land. This paper probes into two issues： 1） To carry out an analysis on the formation causes of the outer bar according to the topography, flow ＆ river type and based on the real-measured data concerning hydrology and sediment, and get the conclusion that the circulating current in the river bend is the main formation cause of the outer bar. 2） Based on the analysis of the real-measured topographic map of the river estuary from 1886 to 1986, and considering the siltation process at the outer bar area, to propose the concept of ＂current having the characteristics of automatic transmission of resistance＂, and explain theoretically the mechanism of diversion and bifurcation of the main current and put forward the condition of diverting.
出处
《水运工程》
北大核心
2015年第4期170-176,共7页
Port & Waterway Engineering
关键词
河道演变
闽江口
外沙成因
改道分汊
机理
channel evolution
Minjiang estuary
formation cause of outer bar
diversion and bifurcation
mechanism
作者简介
魏光裕（1931-），男，高级工程师，从事航道工程设计研究工作。
