古梦婷,钟 亮,王世鹏.望龙碛航道整治工程河段鱼类栖息地水动力指标分布[J].水运工程,2024,(3):97-105
望龙碛航道整治工程河段鱼类栖息地水动力指标分布
Distribution of hydrodynamic indexes of fish habitat in reach of Wanglongqi waterway regulation project
  
DOI:
中文关键词:  航道整治  鱼类栖息地  水动力指标  分布特征
英文关键词:waterway regulation  fish habitat  hydrodynamic index  distribution characteristics
基金项目:
作者单位
古梦婷 重庆交通大学国家内河航道整治工程技术研究中心重庆 400074 
钟 亮 重庆交通大学国家内河航道整治工程技术研究中心重庆 400074重庆交通大学水利水运工程教育部重点实验室重庆 400074 
王世鹏 重庆交通大学国家内河航道整治工程技术研究中心重庆 400074 
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中文摘要:
      栖息地水动力环境对鱼类生存繁殖具有重要影响。针对长江上游望龙碛河段,采用三维水流数值模拟方法探讨航道整治工程对河段内胭脂鱼产卵栖息地水动力指标的影响。结果表明:河道各断面流速分布沿河宽呈“中间高、两边低”;工程后各断面适宜产卵流速区域向右偏移,且偏移量随流量增大而增加,最大偏移量60 m。涡量沿水深成层分布,总体呈“底层大、表层小”;工程后涡量较大值集中出现在工程区域附近及河道断面中部,涡量沿垂线分布变化明显,随着流量增大涡量变幅增加,最大变幅0.05 s-1;动能梯度沿水深分布与涡量相似,沿河宽方向动能梯度分布特征与深水区域分布表现出较强的相关性;流量增大后各断面动能梯度最大值增加。工程后形成的复杂水动力条件有利于鱼类生存繁殖。
英文摘要:
      The hydrodynamic environment of habitat has an important influence on the survival and reproduction of fish.Aiming at Wanglongqi Reach which is in the upper reaches of the Yangtze River,we use three-dimensional flow numerical simulation method to discuss the influence of waterway regulation project on the hydrodynamic indexes of the spawning habitat of Myxocyprinus asiaticus.The results reveal that the velocity distribution of each section of the river is “high in the middle and low on both sides” along the river width.After the regulation project,the optimum spawning velocity area of each section shifts to the right,and the offset increases with the increase of the flow,with the maximum offset of 60 m.The vorticity is distributed in layers along the water depth,with a general pattern of “large in bottom layer and small in surface layer”.After the regulation project,large vorticity values are concentrated in the vicinity of the project area and in the middle of the river section,and the vorticity distribution is changed significantly along the vertical line.With the increase of the flow rate,the vorticity variation are amplitude increased,and the maximum variation amplitude is 0.05 s-1.The distribution of kinetic energy gradient along water depth is similar to that of vorticity,and the characteristics of kinetic energy gradient distribution along river width are strongly correlated with water depth.The maximum kinetic energy gradient of each section is increased with the increase of flow rate.The complex hydrodynamic conditions formed after the regulation project are conducive to the survival and reproduction of fish.
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