Response of hydrological processes in Zamu River basin,Hexi Corridor to climate and land use changes
Climate change (CC) and land use/cover change (LUCC) have been identified as the two main driv-ers of global hydrological dynamics. Investigating the impact of these factors on watershed hydrological process-es is of great significance in unraveling regional hydrological and environmental transformations. In this study,we focus on the Zamu River basin,a representative region in arid Northwest China,and adopt a comprehensive approach utilizing multi-source remote sensing images,hydrometeorological site monitoring,reanalysis product data,the Soil and Water Assessment Tool (SWAT) model,the Mann-Kendall (M-K) trend test,and land use dynamic degree analysis. By integrating these methods,we aim to provide a more accurate and comprehensive understanding of how CC and LUCC affect hydrological processes in the Zamu River basin. By isolating the driving factors of hydrological processes and considering the baseline period,as well as the separate and com-bined influence of CC and LUCC,we investigate the response characteristics and driving mechanisms of hydro-logical processes to these factors in the Zamu River basin. The research findings were as follows:(1) Over the period of 1980 to 2014,the annual precipitation,average temperature and runoff in the basin exhibited an up-ward trend,with increasing rates of 0.47 mm·a-1,0.067 ℃·a-1 and 1.43 mm·a-1,respectively. (2) The distri-bution of land use types in the basin displays spatial heterogeneity,with grassland,woodland,and unused land being the predominant land uses. The comprehensive land-use dynamic degree was 2.91％,and construction land has the highest single land-use dynamic degree. (3) Aside from the single effect of LUCC,the runoff of the basin decreased by 0.12 mm,while the runoff of the single effect of CC and the combined effect of CC and LUCC increased by 6.27 mm and 6.15 mm,respectively. The evapotranspiration of each scenario showed an increasing trend. CC was identified as the primary driving force for watershed runoff and evapotranspiration. Management strategies for water resources,that enhance the adaptability of the basin to CC,were critical to pro-mote the rational allocation of water resources in the upstream,midstream,and downstream of the basin,in the future.
climate changeland use/cover changeSWAT modelhydrological processesZamu River basin
NETL
NSTL
万方数据
