长江流域资源与环境 >> 2005, Vol. 14 >> Issue (4): 496-500.

• 生态环境 • 上一篇    下一篇

江湖洪水不同遭遇对城陵矶水位影响的实验研究

陈 立,邓晓丽,张俊勇,刘 林   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-07-20
  • 通讯作者: 陈 立

INFLUENCE OF COMBINATION OF THE DONGTING LAKE′S OUTFLOW AND THE YANGTZE RIVER STREAMFLOWON CHENGLINGJI WATER STAGE

CHEN Li, DENG Xiao-li, ZHANG Jun-yong, LIU Lin   

  • Received:1900-01-01 Revised:1900-01-01 Online:2005-07-20
  • Contact: CHEN Li

摘要: 城陵矶位于长江干流和洞庭湖出流汇合处,因此影响城陵矶洪水位的因素除了河床淤积、洪水特性等以外,洞庭湖出流与长江干流的不同遭遇也起着非常重要的作用。采用模型实验的方法,研究了不同遭遇、不同流量、不同螺山水位下城陵矶河段水位的变化。结果表明:在城陵矶断面,当监利来水流量超过洞庭湖出流时,主流靠左岸;当监利来水流量少于洞庭湖出流时,主流靠右岸。洞庭湖出流与长江干流来水流量的不同遭遇对城陵矶断面水位的影响非常显著。当监利来水流量占螺山流量的百分比为55 %左右时,城陵矶断面水位最高,即此时长江干流来水流量和洞庭湖出流相互之间顶托消耗能量达到最大值。在中水流量下,当监利来水流量占螺山流量的百分比为55 %左右时,城陵矶断面左右岸水位差达到最小值。

关键词: 江湖关系,洪水遭遇,模型,实验

Abstract: Chenglingji is located in the confluence of Yangtze River′s main stream and Dongting Lake′s outflow. In addition to the deposition of bed level and flood characteristics, the flood combination of Dongting Lake′s outflow and Yangtze River′s main stream is also a very important factor which affects the flood level. We studied the change of Chenglingji crosssection water level under different conditions including different flood composition, different discharge and different water levels of Luoshan by model experiment. The result shows: in Chenglingji crosssection, when inflow of Jianli exceeds outflow of Dongting Lake, threads of steam are close to left side bank; when inflow of Jianli is below outflow of Dongting Lake, threads of steam close to right side bank. The flood combination of Dongting Lake′s outflow and Yangtze River main stream′s inflow affect heavily the water level of Chenglingji crosssection. When inflow of Jianli takes about 55 percent of Luoshan′s discharge, water level of Chenglingji crosssection is highest at that time, that is, the amplitude of setup of Yangtze River main stream′s inflow and Dongting Lake′s outflow consumes energy at maximum value. In middle water discharge, when inflow of Jianli takes about 55 percent of Luoshan′s discharge, water level differences of both banks reaches minimum in Chenglingji crosssection.

Key words: relationship of Yangtze River and Dongting Lake, flood flow combination, model, experiment

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