Study On Ecological Flow Process Of Fen River Based On Plant Habitat Protection In Shore Belt

The ecological environment protection of rivers has attracted widespread attention from scholars from all walks of life.While maintaining the continuous flow in the river,the ecological flow of the river should be able to maintain a certain functional ecological environment outside the river.In this study,taking the main stream of the Fen River as an example,the response of plants to water flow factors obtained through indoor pot experimentation was used to predict the growth of plants along the banks of the three sections of Lancun,Yitang and Chaizhuang,and finally calculated To meet the ecological flow of different sections of the river in consideration of the needs of plant growth in the shore zone,and to provide some help to restore the growth of the shore zone vegetation,the main research contents and results are as follows:1 Select three common plants along the banks of the Fenhe River,including cattail,polygonum,and wormwood,and analyze the response of the shore plants to water flow factors through indoor pot experiments.The results show that:when the soil mass moisture content is 25%,plant growth is the best.When the soil mass moisture content is 15%,it is the lowest soil moisture that can sustain plant growth.Half-submerged is the maximum submergence that plants can withstand.Stress has a certain resistance.2 Perform hydrological analysis on the main sections of the main stream of the Fen River,and use the Saint-Venant equation to establish a one-dimensional flow prediction model,which predicts the changes in river runoff in time and space.Compared with the measured results,the model prediction results can better reflect Fen.The flow of each section of the main stream provides a reference for the prediction of plant growth dynamics.The minimum,optimal,and maximum submerged depths of the plants obtained in the experiment are compared with the measured average water depths of the river channels to predict the dynamic growth of plants,which can more accurately judge the growth of plants on the shore.3 Based on common methods and considering the growth of plants on the shore,the ecological water requirements of Lancun,Yitang and Chaizhuang are calculated for different river sections.Common methods are calculated using four methods:median method,7Q10 method,intra-year spread method and multi-year monthly average flow method.The average monthly flow of years evaluated by Tennant method is selected as the ecological flow of each section.Considering the riparian plant growth method,the multi-year average monthly flow is used as the river base flow,and the area quota method is combined with experimental data to calculate the water demand for plant growth along the riparian section of the selected section of the river,and the Thornthwaite formula is used to calculate the selected section of the river The potential evapotranspiration along the shore zone along the section,and finally,comprehensively consider the ecological water demand of each sub-ecology,and calculate the required ecological flow.4 Comparing the two calculation results,considering that the ecological flow calculated by the shore zone plant growth method can better meet the water demand for plant growth during the critical growth period,the ecological flow calculated by the two methods is integrated.The results are:the monthly ecological flow(108m3)of the Lancun section is:0.14,0.16,0.28,1.28,1.41,1.56,2.17,2.67,0.60,0.47,0.24,0.16;the monthly ecological flow of the Yitang section(108m3)in order:0.42,0.43,1.19,2.91,4.77,6.07,6.78,6.93,2.23,1.41,0.53,0.38;the monthly ecological flow(108m3)of the Chaizhuang section is:1.03,0.92,1.63,4.10,4.67,5.13,7.63,9.20,3.66,2.23,1.23,1.01.