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水文水力条件的变化会给水生生物繁殖栖息带来一系列的影响,评估这些影响能为保护和重建物种栖息地提供科学依据。本文以葛洲坝下游河势调整前地形(2003年)和河势调整后地形(2008年)作为边界条件建立二维非恒定流水动力学模型,模拟中华鲟产卵场整个产卵期的水流变化特征。通过对比河势调整前后中华鲟产卵场地形、流场和涡量的变化,流量变化过程中各水流参数与相关系数的变化,以及河势调整工程给产卵场水力条件带来的变化,对照河势调整前后中华鲟产卵位置和资源量的变化进一步分析了其对中华鲟产卵的影响。结果显示,河势调整使中华鲟上产卵区河床高程抬升,流场紊动程度加大,水流结构随着流量变化的相关性减小;使下产卵区流场紊动程度减小。
Changes in hydrological and hydraulic conditions will have a series of aquatic organism breeding habitat to assess these impacts can provide scientific basis for the protection and reconstruction of species habitat. In this paper, a two-dimensional unsteady flow hydrodynamic model was established with boundary conditions before the Gezhouba river (2003) and river-adjusted terrain (2008) as the boundary conditions to simulate the characteristics of water flow during the whole spawning period of the Chinese sturgeon . By comparing the changes of the topography, the flow field and the vorticity of the spawning ground of Chinese sturgeon before and after the adjustment of the river regime, the changes of the parameters and the correlation coefficients of the water flow and the hydraulic conditions of the spawning ground during the process of the flow regulation, The changes of spawning position and resources of Chinese sturgeon before and after the adjustment of the river regime were further analyzed for their influence on the spawning of Chinese sturgeon. The results showed that river regulation adjusted the river bed elevation in the spawning area of Chinese sturgeon, and the turbulence of the flow field increased. The correlation of the flow structure with the flow rate decreased. The turbulence of the flow field in the lower spawning area was reduced.