The Research On Some Chemical And Physical Test Methods In The Chemical And Fiber Production Process

This paper summarizes the research progress on ecological water demand at home and abroad,and summarizes the main problems in the field of ecological water demand research.The Bai Yi nunxi is one of the 8 permanent streams in the Western hairy lake.The river basin is seriously affected by human activities,and the different ways of land use are different to the river.The flow rate and the water quality have great influence,which makes the quantitative description of the river hydrological change difficult.Therefore,it should be combined with the water cycle process to study the ecological water requirement of the Bai Yi nunxi River Basin.This paper combines the distributed hydrological model to calculate and predict the local ecological water requirement.Firstly,the paper analyzes the current situation of water resources in the basin and its main ecological problems,and puts forward the calculation method of ecological water requirement for each subsystem in the local basin,and then uses the elevation data of the Bai Yi nunxi River Basin,the land use data and the meteorological data of the soil data,and constructs the SWAT distributed water in the Bai Yi nunnery River Basin.Based on the monthly scale,the ecological water requirement of the watershed is calculated.The annual water demand in the basin is 25.79*106m3.The total amount of ecological water demand outside the river is 17.21*105m3,of which the proportion of urban ecological water demand is the largest,and the ecological water demand of the water area is 24.08*106m3.In addition,the SWAT model is used to simulate the hydrological changes of different ecological scenario planning in the basin,and the ecological water demand for the gradual construction of artificial wetland system in the future is predicted according to the precipitation in different rainfall frequency years.The results show that the A schemes in 2020,2025 and 2035 are 25.12 × 106m3,23.52× 106m3,18.92 × 106m3,B scheme 23.24 × 106m3,22.27 × 106m3,18.76 × 106m3,showing a trend of decreasing year by year.The basin can reach the overall ecological planning goal of the lake,and improve the productivity and self maintenance ability of the ecological system.A landscape water type ecological barrier.The results also show that planned constructed wetlands help to make use of local water resources and sustainable development,especially during the dry and abundant water years.The simulation results show that the wetland has a significant effect on reducing the ecological water demand,which can be explained to a certain extent for water conservation and drought prevention and drought prevention.It has a great effect.In addition,the ecological scenario planning B has advantages in reducing the ecological water requirement than A.After the ecological water demand was predicted for different frequency years,the SWAT output data was analyzed.The data showed that the output of the SWAT model was representative.This paper puts forward the ecological water requirement of the Bai Yi River Basin,which can provide a reference for the planning and management of water resources in the local basin.At the same time,based on the ecological protection target of river basin,the ecological water demand of different frequency years in the basin is predicted by combining the distributed hydrological model,which provides a new calculation idea for the quantitative prediction research of the local ecological water demand,especially the river ecological water requirement.