长江流域资源与环境 >> 2009, Vol. 18 >> Issue (9): 860-.

• 生态环境 • 上一篇    下一篇

大型梯级水库对河流生态流量的影响——以金沙江下游梯级为例

王 波| 黄 薇| 尹正杰   

  1. (长江科学院水资源研究所| 湖北 武汉 430010)
  • 出版日期:2009-09-20

ON ECOLOGICAL FLOW IMPACT OF LARGE CASCADE RESERVIORS——A CASE STUDY ON LOWER JINSHA RIVER

WANG Bo| HUANG Wei| YIN Zhengjie   

  1. (Water Resource Department of Changjiang River Scientific Research Institute| Wuhan 430010| China)
  • Online:2009-09-20

摘要:

大型梯级水库通常具有较大的调节库容,水库运行使坝下河道自然的流量过程受到较大扰动,一些具有重要生态意义的流量组的特征被改变,如洪水、高流量脉动、低流量和极端低流量。基于BRAIN等提出的河流生态流量影响研究理论,结合金沙江屏山断面的水文与河流生态的关系,选取水平年组对高流量脉动和极端低流量组的判别参数进行率定,确定自然条件下屏山断面生态流量组指标值。模拟金沙江下游梯级建成后的逐日流量过程,求得各生态流量组指标值并与自然条件下的指标值进行对比,分析金沙江下游“乌东德—白鹤滩—溪洛渡—向家坝”梯级水库建成后可能对屏山断面生态流量过程的影响。研究结果表明:建库后屏山断面将可能出现“极端低流量消失、低流量提高、高流量脉动散化、洪水基本保持”的变化特点.

关键词: 生态流量/ 大型水库/ 金沙江/ 屏山/ 自然河流

Abstract:

Large cascaded reservoirs generally hold very large regulating storage.The running of the reservoirs exerts great effects on the natural discharge process along the river course below the dam.The runoffgroup’s characteristics are changed which have important ecological meaning,such as flood,high flow pulse,low flow and extreme low flow.Pingshan section’s ecological flow group’s characteristic value under natural condition was given,based on the river’s ecological flow discharge effect theory,suggested by BRAIN,after considering the relation between the Pingshan section’s hydrology and river’s ecology of Jinsha River and choosing target year group to make calibration to the parameters of high flow pulse and extremely low flow.The daybyday flow discharge processes were modeled after the construction of cascaded reservoirs along Jinsha River course,the characteristic value of every ecological flow group was given and the modeled result was compared with that under natural condition,the effect on the Pingshan section’s ecological flow process caused by the WudongdeBaihetanXiluoduXiangjiaba cascaded reservoir constructed along Jinsha River course was analyzed.The results show that some changes of “extreme low flow never appeared,low flow increased,high flow pulse fragmented and flood kept” may take place at the Pingshan section  after the dams’ construction.

Key words: ecological flow/ large reservoirs/ Jinsha River/ Pinshan section/ natural river

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