Ecological responses of spawning habitat suitability to changes in flow and thermal regimes influenced by hydropower operation
文献类型： 外文期刊
作者： Qiu, Rujian 1 ; Wang, Dong 1 ; Singh, Vijay P. 3 ; Zhang, Hui 5 ; Tao, Yuwei 1 ; Wu, Jichun 1 ; Wang, Yuankun 2 ;
作者机构： 1.Nanjing Univ, Sch Earth Sci & Engn, Dept Hydrosci, Key Lab Surficial Geochem,Minist Educ,State Key L, Nanjing, Peoples R China
2.North China Elect Power Univ, Sch Water Resources & Hydropower Engn, Beijing, Peoples R China
3.Texas A&M Univ, Dept Biol & Agr Engn, Zachry Dept Civil & Environm Engn, College Stn, TX 77843 USA
4.United Arab Emirates Univ, Natl Water & Energy Ctr, Al Ain, U Arab Emirates
5.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Beijing 430223, Hubei, Peoples R China
关键词： ecological flow; habitat suitability; reservoir operation; water temperature
期刊名称：ECOHYDROLOGY （ 影响因子：3.166； 五年影响因子：3.369 ）
ISSN： 1936-0584
年卷期：
页码：
收录情况： SCI
摘要： Large reservoirs and dams can fundamentally alter downstream flow and thermal regimes by resetting the flow and water temperature release boundary conditions, resulting in significant impacts on fish habitat suitability. Therefore, it is critically important to understand how the volume and temperature of dam releases to influence downstream hydraulic and temperature dynamics and predict the ecological responses of fish habitat suitability to these changes. In this study, a physically based coupled model framework was developed to identify the temporal and spatial variations of hydraulic and water temperature regimes and the spawning habitat suitability of four major Chinese carps (FMCC) in the middle reach of the Yangtze River below Three Gorges Reservoir (TGR) responded to different upstream boundary conditions established by dam operation. The results showed that the dam discharge volume from TGR mainly affected the downstream hydraulic regime, while dam discharge temperature would have most impact on downstream water temperature. The spawning habitat suitability of FMCC obviously decreased due to TGR operation, and the declined water temperature suitability and the delayed and narrowed window of suitable water temperature were the main influencing factors. For the purpose of maximizing the spawning habitat suitability of FMCC in the downstream reaches below TGR, dam discharge volume ranged from 10,000 to 22,500 m(3)/s, and dam discharge temperature varied from 22 to 23.5 degrees C would be recommended as the outflow conditions in the ecological operation of TGR.
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