中文摘要：

分析了葛洲坝坝下中华鲟产卵场近20年的水文资料和实测的产卵场地形和水力数据,通过Tennant法计算得到了不同栖息地状况下的生态需水量范围,其最佳范围为7800～13000m3/s。随后采用IFIM法,同时考虑中华鲟对栖息地流速、水深、底质的喜好性,并利用地理信息系统技术结合中华鲟产卵场水动力模拟结果计算了不同流量边界条件下的适宜栖息地面积,从而得到中华鲟产卵时生态需水量范围为5000～15000m3/s,随后利用各年实测的中华鲟产卵日的流量数据验证了该结果。计算结果还表明,当水流只通过葛洲坝大江电厂和二江电厂时,产卵场适宜栖息地面积比其它几种工况大;且同流量下基于1999年地形得出的适宜栖息地面积远大于基于2003年地形得出的适宜栖息地面积。

英文摘要：

Tennant method is used to attain the ecological flow requirement for Chinese sturgeon spawning habitat on the downstream of the Gezhouba Dam based on the analysis on hydrological data in recent 20 years.The results show that the optimal range is about 7 800～13 000 m3/s.Then,based on the survey topographic and hydraulic data,Instream Flow Incremental Method is used to make a further simulation for water depth,velocity and substrate.Habitat suitability index and GIS technique are used to connect the hydrodynamic model and biological characteristic of Chinese sturgeon to obtain the fish habitat area as a function of stream flow for the spawning habitat.The result indicates the optimal flow range for spawning habitat is about 5 000～15 000m3/s,which is validated with the surveyed flow in the spawning date annually.When the outflow is from both the Dajiang power plane and Erjiang power plant of Gezhouba Hydropower Station,the area of the spawing hahital is largest.