鱼类产卵场修复设计模拟研究——以大渡河上游支流为例

Simulation Study on the Restoration Design of Fish Spawning Grounds——Taking a Tributary of the Upper Dadu River as an Example

目前,在大渡河上游干流及部分支流河段,部分鱼类产卵场遭到一定程度的破坏。应用适当的河流生态评价体系和方法进行模拟研究,对大渡河上游干流及支流生态修复具有重要的意义。本文选取大渡河上游支流河段,对鱼类产卵场进行模拟,将河段内优势物种作为研究对象,运用河道内流量增量法(IFIM),基于River2D模型对生态修复前后适宜产卵场面积进行加权计算,模拟研究生态修复前后鱼类产卵场适宜性变化,为鱼类产卵场生态修复设计、水生态保护和水资源开发利用提供参考。模拟研究结果表明,采取生态修复后,鱼类产卵场有效面积显著增加,鱼类生境适宜性明显改善。

At present,some fish spawning grounds have been damaged to a certain extent in the main stream and some tributary sections of the upper reaches of the Dadu River.The application of appropriate river ecological evaluation systems and methods for simulation research is of great significance to the ecological restoration of the main stream and tributaries of the upper reaches of the Dadu River.This paper selects the upper tributary reaches of the Dadu River to simulate fish spawning grounds,and takes the dominant species in the river section as the research object,and uses the Intra-River Flow Increment Method(IFIM),and weights the area of suitable spawning grounds before and after ecological restoration based on the River2D model,and simulates and studies the changes in the suitability of fish spawning grounds before and after ecological restoration,so as to provide references for the ecological restoration design of fish spawning grounds,water ecological protection and water resources development and utilization.Simulation results show that after ecological restoration,the effective area of fish spawning grounds has increased significantly,and the suitability of fish habitat has been significantly improved.