Analysis On The Influence Of Yangtze Huaihe River Diversion Project On The Ecological Environment Of Shayinghe National Wetland Par

The construction and implementation of the Yangtze Huaihe River diversion project will have a great impact on the hydrological situation in the water receiving area of the project,which will not only bring great economic benefits to the region along the line,but also produce different degrees of ecological and environmental effects.Shayinghe National Wetland Park,as a typical ecological area along the project,analyzes the impact of river diversion project on its ecological environment,provides scientific basis for maintaining wetland ecosystem,and provides ecological hydrological basis for sustainable development of water diversion project.This paper uses MODIS NDVI remote sensing data to extract THE NDVI value of the study area and calculate the regional vegetation coverage.Through the study on the relationship between regional vegetation coverage and wetland ecological factors in Shayinghe National Wetland Park,the influence of precipitation,river level,groundwater depth and other factors on regional wetland ecological environment was analyzed.Based on the current situation data of the River Diversion project and through the investigation and collection of geological and hydrogeological data of Shayinghe National Wetland Park and its surrounding areas,the regional groundwater flow conceptual model is established by using Visual MODFLOW software.After empirical identification,the influence of the River diversion project on the groundwater level of the receiving area within ten years is predicted.On this basis,the influence of the Yangtze river diversion project on the ecological environment of Shayinghe National Wetland Park was predicted by analyzing the influence of the project on the hydrological situation in the study area.The main conclusions of this study are as follows.(1)Precipitation change,river flow change and regional groundwater level in the study area have a certain impact on wetland evolution in Shayinghe National Wetland Park.According to the analysis of the relationship between vegetation and regional rainfall and river level change,vegetation growth is the best in wet years.According to the study on the relationship between groundwater level and vegetation growth in the study area,the vegetation growth situation is better when the groundwater depth is1.2～3.4m.(2)Through the establishment of the groundwater flow numerical model in the study area have predicted Jiang Jihuai project water diversion after ten years of water level changes and buried depth of groundwater,water conveyance project of shaying river national wetland park after a year of groundwater level depth will reach 3.0 ～ 3.8m,five years later shaying river national wetland park of groundwater level depth will reach 2.8 ～ 3.4 m,Ten years later,the groundwater depth of shayinghe National Wetland Park will reach 2.7～3.3m.(3)The vegetation growth and development of Shayinghe National Wetland Park will be improved to a certain extent compared with the current situation,and will change the hydrological situation of the wetland park,which will have a corresponding impact on the ecological environment of the wetland park in the long term.Overall project run ten years,will improve the regional surface and groundwater quality,increase the degree of vegetation growth and development,improve the ability of wetlands in the fight against extreme weather,promote the expansion of artificial wetland area,increase species diversity,the wetland park the shaying river national wetland park wetland ecological system become more rich and stable.