摘要
通过分析洞庭湖区 8个代表水文站 37年 11× 10 4 个逐日水位数据 ,研究了湖区不同时期滩地出露天数的变化规律 ,根据三峡工程建成前后与建成初期典型年逐日水位数据库资料 ,分析了三峡工程建成后 ,湖区各代表水文站水位的变化 ,在以上研究基础上 ,预测了三峡工程对湖区滩地出露天数的影响。认为 :三峡工程建成后初期 ,滩地出露天数变化的是低位滩地 ,中位滩地出露天数有一定变化 ,高位滩地基本不变 ;1～ 5月低位滩地和 6月中位滩地的出露天数都减少 ,7～ 9月出露情况不变 ,10～ 11月中低位滩地出露天数增加值大 ,12月出露天数变化小 ;其中东洞庭湖区和南洞庭湖区的横岭湖区滩地变化大。建成后中长期 ,所有高程滩地出露天数将逐渐增加。
Dongting Lake,one of the largest lake in China,has a beach of about 2 275 square kilometers in dry season.The length of emergence period of the beach is important for its utilization.It also affects the plant and animal communities and their populations on the beach.This paper studies the gegular pattern of the length of emergence period of the beach by analyzing the water level data of 8 main hydrologic stations in Dongting Lake area from 1952 to 1988.Based on this pattern and the simulated data of the water level of the lake after Three gorge Project's construction,the possible changes of the length of emergence period of the beach are predicted.The conclusions are period:(1)At the initial stage after the completion of the project,the length of emergence changes dramatically at low level beach,changes to a certain degree at medium level beach,and basically remains the same at high level beach.(2)The length of emergence period of low level beach from January to May and of low and medium level beach in June will shorten.Little changes on the length of emergence perild the beach from July to September and in December.However,The length of emergence low and medium level beach from October to November will lengthen greatly.(3)The length of emergence period of the beach in the east Dongting Lake and Hengling Lake (in the south Donging Lake) changes to a larger extent.(4)For medium and logterms after the project's completion,the emergence period of the entire beach will lengthen gradually.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
2000年第2期254-259,共6页
Resources and Environment in the Yangtze Basin
基金
中国科学院特别支持费课题!(STZ 1 13)资助
关键词
三峡工程
洞庭湖
滩地
出露天数
环境影响
Three gorge Project
Dongting Lake
beach
length of emergence period
