Characteristics of Land Use Change and Its Relationship with Key Hydrological Factors in the Liuyang River Basin
Exploring the interaction between land use types and hydrological processes in the basin can provide a scientific basis for the management of water and soil resources and the prevention of drought and flood disasters in the basin under changing environment.This paper analyzed the land use changes in Liuyang River Basin from 1990 to 2019,using data of land use,rainfall and evaporation.,The study uses dynamic degree,new land use change model and cross wavelet analysis to examine the relationship between land use and key hydrological factors.The results showed that the forest area accounted for 69.12%～76.64%of the total area of the basin,decreasing overtime,while the urban land use consistently expanded.The transfer of land use mainly occurred between forest,cultivated land and urban land.During the process of land use type transformation in Liuyang River Basin,the new land use change model can accurately identify the underlying characteristics of inhibition and tendency.The model highlights the transformation of forest land to cultivated land as having an absolute tendency towards change.There was no obvious linear relationship between the annual rainfall and the main land use types within the basin,while there was a significant linear correlation between evaporation and forest,cultivated land and urban land.The grey correlation index between annual rainfall,annual evaporation and main land use types ranged from 0.4982 to 0.8097,and the nonlinear correlation was significant.The change of cultivated land area will significantly promote the change of annual rainfall and annual evaporation,while the forest area is significantly affected by the key hydrological factors of the basin.The land use types in the Liuyang River Basin have changed,and these changes interact and mutually influence the key hydrological factors.Optimizing the land use mode of the basin can open up a new way to alleviate the meteorological and hydrological disasters in the basin.
Land use changehydrological elementsland use dynamicscross wavelet analysisLiuyang River Basin
NETL
NSTL
万方数据
维普
