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葛洲坝的修建阻隔了中华鲟上溯到上游产卵场的洄游通道,使其被迫在葛洲坝坝下4 km范围内形成新的产卵场,葛洲坝泄流对中华鲟产卵场的空间分布造成了一定影响.为了探明葛洲坝小出库流量且仅开启大江电厂发电泄流状况下,大江电厂发电泄流量的改变对坝下中华鲟产卵场产卵栖息适合度以及产卵场空间分布特性的影响,在构建中华鲟产卵场三维水动力数学模型及栖息地评价模型的基础上,对葛洲坝大江不同发电泄流量及不同机组泄流量工况下中华鲟产卵栖息地空间分布特征进行深入分析.结果表明,大江电厂单机泄流量增量小于200m~3/s时,可增加坝下中华鲟产卵栖息地适宜值,有利于中华鲟产卵繁殖;增加大江各机组的发电泄流量对坝下中华鲟产卵场空间分布具有一定的影响,各机组流量增量小于200m~3/s时,中华鲟产卵场面积增大,产卵场位置自右岸向左岸扩展,中华鲟获得更为广阔的产卵空间.
The construction of the Gezhouba barrier blocked migration of Chinese sturgeons to upstream spawning grounds and forced them to form new spawning grounds within 4 km below Gezhouba Dam. Gezhouba drainage caused a spatial distribution of the spawning grounds of Chinese sturgeon A certain influence.In order to ascertain the small outflow of Gezhouba Dam and only open the discharge situation of the Dajiang Power Plant, the adaptability of the discharge of the Dajiang Power Plant to spawning habitat and the spatial distribution characteristics of the spawning grounds Based on the three-dimensional hydrodynamic model and habitat evaluation model of spawning ground of Chinese sturgeon, the spatial distribution characteristics of spawning habitat of Chinese sturgeon under different power generation discharges and discharges of different units in Gezhouba Dam were analyzed in detail The results show that when the discharge increment of single unit in Dajiang Power Plant is less than 200m ~ 3 / s, the suitable value of spawning habitat for Chinese sturgeon can be increased, which is beneficial to the spawning of Chinese sturgeon. The spatial distribution of spawning ground of Chinese sturgeon has some effects. When the flow increment of each unit is less than 200m ~ 3 / s, the area of spawning ground of Chinese sturgeon increases, and the position of spawning ground expands from the right bank to the left bank , Chinese sturgeon obtained more expansive oviposition space.