基于Euler-Lagrange方法的漂流性鱼卵生态需水量数值研究
River Ecological Water Requirement for Protecting the Drifting Fish Eggs Based on Euler-Lagrange Method
作者：赵琴(四川大学 水力学与山区河流开发保护国家重点实验室;西华大学 能源与环境学院)；李嘉(四川大学 水力学与山区河流开发保护国家重点实验室)；王锐(四川大学 水力学与山区河流开发保护国家重点实验室)；黄辉(四川大学 水力学与山区河流开发保护国家重点实验室)
Author：Zhao Qin(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ;School of Energy and Environment,Xihua Univ.)；Li Jia(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ.)；Wang Rui(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ.)；Huang Hui(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ.)
收稿日期：2010-01-25 年卷（期）页码：2010,42(6):31-37
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：生态需水量;Euler-Langrange方法;漂流性卵;鱤鱼
Key words：ecological water requirement;Euler-Lagrange methods;drifting eggs;Eloplichtys bambusa
基金项目：四川省教育厅青年基金资助项目(09ZB082)
中文摘要
目前河流生态需水量的研究偏重流量大小， 缺少不同流量下流速分布对鱼类生存环境影响的分析。 从水力学理论出发， 提出研究河流中漂流性鱼卵运动规律的数值计算方法，分析计算结果，可以推算出相应的生态需水量。 先应用Euler方程计算3维流场分布， 再加入悬浮颗粒， 运用颗粒运动的Lagrange方程预测颗粒的运动轨迹，分析颗粒的沉降情况。通过水槽实验对该方法的准确性予以验证。在此基础上，对向家坝水电站下游宜宾-寸滩381.78 km江段内鱤鱼卵颗粒运动规律进行数值计算、分析，推算出鱤鱼产卵期内向家坝电站应有的最小出库流量。
英文摘要
Aimed at protecting drifting fish eggs,a new numerical method for river ecological water requirement was proposed based on the hydraulics theory.The eggs and fries were considered as suspended particles whose motions depend on the continuous fluid.The geometric models of the river were established and the velocity fields were simulated with Euler model，then suspended particle motion equation was established and the moving traces were solved with different flow rates.The lowest flow rate in which particles keep drifting could be found by the analysis of the results. The motions of particles obtained from numerical models agreed well with the channel experiment. The method was put forward with the 381.78 km reducing reach of Changjiang River downstream of Xiangjiaba water station for example. The fish which lay drifting egg was Eloplichtys bambusa. The lowest discharges of Xiangjiaba water station in the breeding reason could be found.
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