Research on hydrological effects of urbanization land use and landscape pattern changes based on SWAT model
The rapid development of urbanization has led to significant changes in land use types,which in turn triggered a series of hydrological and environmental issues.Based on 2000 and 2015 land use data,this paper developed a SWAT distributed hydrological model to explore the difference in hydrological effects caused by land use changes and landscape pattern evolution in the Beijiang River Basin(a tributary of the Pearl River Basin).Research shows that:a)The area of urban construc-tion land in the Beijiang River Basin continued to increase from 2000 to 2015,and the area of woodland and arable land showed a decreasing trend.b)The inter-annual impact of land use change on hydrological processes is mainly manifested in the expansion of urban land use,which has led to an increase in surface runoff and evapotranspiration,as well as a decrease in soil water content and lateral water flow.The impact during the year is mainly reflected in the significant seasonal differences in the increase in surface runoff and evapotranspiration,as well as the decrease in soil water content and lateral water flow.c)From 2000 to 2015,the land use types and landscape patterns in the Beijiang River Basin tended to be fragmented,and the heterogeneity of the landscape increased,leading to an increase in surface runoff.Our research believes that by increasing the degree of aggregation and superiority of landscape types,the harm caused by the increase in surface runoff caused by the expan-sion of urban land area can be reduced.
The Beijiang River BasinSWAT modellandscape indexhydrological effects
万方数据
维普
