RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (4): 606-606.

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ON ECOLOGICAL RUNOFF ADJUSTMENT IN DOWNSTREAM WATERS OF DAMS

YU Guorong1,2| XIA Ziqiang1,2| YE Hui3| WANG Guihua2 | WU Yao2   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-07-20

Abstract:

In this paper the influence of dams on flow regime is analysed.Taking Yichang hydrological station located in the downstream of Three Gorges Dam as an example,ecohydrological season,ecological water requirement and other runoff regime characteristic parameters of Yichang hydrological station were calculated.The results show that dry season is from January to March,subordinate flood season is from April to June and from October to December,and flood season is from July to September;minimal ecological water requirements in the dry,subordinate flood and flood season occupy 24%~27%,30%~50% and 30%~45% of the same period total water quantity,respectively；optimal ecological water requirements in dry and flood season are 30%~42% and 50%~70%,respectively;optimal ecological flows of four major Chinese carps and Chinese sturgeon in the spawning period range from 6 540 m3/s to 12 700 m3/s and from 9 130 m3/s to 16 300 m3/s,respectively,almost occupy 50%~70% of the same period total quantity;average swelling times are 53 and 34,and average falling times are 50 and 51 respectively,and so on.The study provides foundation knowledge for Three Gorges Reservoir operation in the spawning period of four major Chinese carps and Chinese sturgeon.〖

 

Key words: dam, ecohydrological season, ecological water requirement, flow regime〖  

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