Study On Ecological Restoration Of Typical Damaged River Section Of Wutong River

As the increase of man-made use of river resources,the problem of river ecological environment has begun to be paid much attention by human beings.Ecological flow is the minimum flow that the river needs to maintain,and it is the guarantee for the river ecosystem to exercise its normal function.Determine the ecological flow rate,optimize the allocation of water resources,improve the efficiency of water resources use,and promote the coordinated and balanced development of human society and natural environment.There are some problems in the WuTong River basin,such as the development and utilization of downstream water resources,the large amount of water used in agriculture,the deforestation of rivers and the reduction or even outage of river flow caused by climate change,and the reduction of biomass in rivers caused by this main reason,so it is necessary to study the ecological problems of the Wu Tong river.The main research contents of this paper are as follows:(1)Taking the WuTong river basin as the study area,the topography,meteorological climate,water system,vegetation,river basin fish resources and key section hydrology of the river basin are comprehensively understood,and the main aquatic ecological environment problems in the basin are summarized.This paper analyzes the quantitative hydrological situation of the dam site section of Guan men zui zi,the section of the Guan men zui zi drainage head,the section of the Bao quan ling drainage head,and the section of the Xiao shan liang zi.(2)Based on the typical section of 2 Fish spawning field sections in the middle and lower reaches of the Wu Tong river,the ecological flow in the river channel is calculated,and the minimum ecological flow of the dam site section of the proposed reservoir is determined by combining the minimum dilution purified water and the ecological water recharge of the river Beach wetland in the middle and lower reaches.It is calculated that the fish spawning period(April-August)discharge the ecological flow rate is 5.74m~3/s,the general water period ecological flow is 1.76m~3/s,at the same time,considering the normal situation of wetland ecological water demand,it is necessary to increase the 0.01m~3/s of the ecological base flow of the Xiao shan liang zi in June,In order to protect the ecological water demand of wetland in the lower reaches of Wu tong river.(3)This paper simulates the suitability of fish life habitat in the damaged river section of the Xiao shan liang zi in the lower reaches of the Wu Tong river,compares the influence of the hydrodynamic changes of the ecological restoration project and the natural straightening channel on the fish habitat,and analyzes the actual fish survey datas,and obtains the improvement effect of the hydrodynamic change of the dam of the repaired project on the fish habitat.