The relationship between large hydropower projects and regional ecological factors——Taking Xiangjiaba and Xiluodu power stations as examples
Taking Xiangjiaba-Xiluodu Hydropower Stations as the study area,this paper analyzes the relationship between the construction of large hydropower projects and the changes in typical ecological factors in the region.Firstly,the spatiotemporal rules of land cover and typical surface parameters(normalized vegetation index NDVI,net primary productivity NPP,surface evaporation ET,and surface temperature LST)were analyzed.Based on the buffer analysis method,the variation characteristics of the surface parameters around the power station hub area are calculated,and the spatial impact scale of the hydropower project on the surface parameters is analyzed.The results showed that in terms of land cover,woodland,grassland and cultivated land in the basin have been transformed to a certain extent since 2000,but the overall pattern remains stable.The artificial surface area in the basin increased significantly,but the overall proportion was still small,indicating that the hydropower project had little impact on the overall land cover of the basin.In terms of spatiotemporal changes in vegetation,NDVI and NPP have improved significantly since 2000,but the spatial variability of the variation trend of surface parameters is significant.With correlation analysis,no significant changes in vegetation parameters(NDVI and NPP)were found after water storage.Some effects on evaporation and surface temperature in buffer zones after water storage,but the effects are not stable.
hydropowerecological impactsvegetationevaporationsurface temperature
国家科技期刊平台
NSTL
万方数据
