Study on the Spatial-temporal Variation Characteristics of Blue-green Water in Typical Years in the Poyang Lake Basin Based on SWAT Model
In this paper,SWAT model was used to analyze the spatial and temporal distribution characteristics of blue water and green water resources in typical years of Poyang Lake Basin from 1970 to 2018,and the changes of green water coefficient in typical years were analyzed. The results showed that in typical years,the blue and green water resources were the most in the wettest year,the least in the driest year,and the moderate in the normal year. The change trend of blue water was large,and the change of green water was relatively stable.Among them,green water flow was the main part of green water amount,and green water storage only accounted for a very small part.The blue water amount showed a decreasing trend from northeast to southwest,which was basically consistent with the spatial distribution of precipitation. Green water resources were not only related to climatic conditions such as precipitation,but also related to human activities and the nature of underlying surface.The green water coefficient of the basin was not high. The highest green water coefficient in the driest year was 45.42％,the lowest green water coefficient in the wettest year was 33.91％,and the normal year was 38.75％. It showed that blue water resources were the main component of water resources in the Poyang Lake Basin.At the same time,the spatial distribution of the green water coefficient and the spatial distribution pattern of precipitation showed an opposite trend.
Blue-green waterSWAT modelSpatial-temporal variation characteristicPoyang Lake Basin
万方数据
维普
