Impact of Floods on Ecological and Hydrological Environment of Watersheds under Background of Climate Change
In order to protect the ecological environment and promote the sustainable utilization of resources,the impacts of flood dis-asters on the ecological and hydrological environment of river basins under the background of climate change were studied.Taking a basin as the research area,the climate change and surrounding environmental factors were analyzed to get the rainfall change in the basin.The potential evapotranspiration was estimated by Penman formula to obtain the difference between monthly rainfall and evapotranspiration.The flood disaster levels were classified according to the standardized precipitation evapotranspiration index.The results show that after the flood,the concentrations of sodium,aluminum and zinc increase significantly,the increase of phosphorus content indicates the risk of eutrophication,and the increase of ammonia nitrogen and COD,indicating that the flood aggravates organic pollution and the deterioration of water quality.During the flood,the dissolved oxygen content decreased from 50 g/L to 46 g/L,the basin discharge increased from 183 000 m3/s to 201 000 m3/s,and the basin water level also increased from 19.63 m to 21.89 m,which had a certain impact on the ecological environment and human activities in the basin.
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