【摘要】 阐述了水平涡量的计算方法,在三维水流数值模拟的基础上计算了6种流量条件下的葛洲坝下游中华鲟产卵场水平涡量分布,结合产卵记录探讨了水平涡量与中华鲟产卵的响应关系。计算结果表明,随着流量的增大产卵场底层水平涡量值无明显变化,卵浓度随水平涡量的增大呈下降趋势,鱼卵密集区的水平涡量上限值为1.0×10-3s-1,说明中华鲟产卵对区域水平涡量具有选择性。此行为具有重要的生物学意义。更多还原

【Abstract】 This paper develops a calculation method for the mean vertical vorticity and its distribution over a Chinese sturgeon spawn field on the basis of 3D flow simulation under the condition of six river discharges,with a discussion of the relationship between the spawning behaviors and the vorticity strength.The results show that the mean vorticity at the bottom varies slightly with the flow discharge and the vorticity upper limit of the eggs mass fields is 1.0 × 10-3s-1.Such a vorticity condition favors the fertilization rate and the protection of fertilized eggs.The preference is of biologic significance.更多还原