喀斯特地貌的赤水河流域因其独特的水文特性,对水资源管理和防旱减灾构成了严峻挑战.以赤水河流域为研究对象,评估SWAT(Soil and Water Assessment Tool,SWAT)模型在此区域的适用性,模拟赤水河流域的日径流量变化和分析干旱年份的时空演变特征,为水资源管理提供决策支持.研究结论如下:SWAT模型在赤水河流域显示出良好的适用性,在校正期和验证期的R2和ENS值均超过了 0.70,表明模型能够可靠地模拟流域的水文过程;模型所预测的逐日径流量与实际观测数据在趋势上显示出良好的一致性,特别是在6-8月的汛期,模型的预测能力表现尤为突出;经由SWAT模型计算的CI综合气象干旱指数,能够客观地反映赤水河流域干旱的时空演变特征,从而为干旱灾害的监测预警、评估工作提供有效的技术支持.
Hydrological simulation and drought assessment of karst watershed based on SWAT model——a case study of Chishui River Basin
The unique hydrological characteristics of the Chishui River Basin in karst topography pose challenges to water resource management and drought prevention and disaster reduction.This study takes the Hongshui River Basin as the research object,aiming to evaluate the applicability of the SWAT(Soil and Water Assessment Tool,SWAT)model in this region,simulate the daily runoff changes in the Chishui River Basin,analyze the spatiotemporal evolution characteristics of drought years,and provide decision support for water resource management.The research conclusions are as follows:The SWAT model has shown good applicability in the Chishui River Basin,with R2 and ENS values exceeding 0.70 during the calibration and validation periods,indicating that the model can reliably simulate hydrological processes in the basin;The model can accurately simulate the hydrological changes in the Chishui River Basin,and the measured and simulated daily runoff trends are generally consistent.Especially during the main flood season from June to August,the simulation effect of the model is particularly outstanding;The CI comprehensive meteorological drought index calculated through the SWAT model can objectively reflect the spatiotemporal evolution characteristics of drought in the Chishui River Basin,providing an effective tool for monitoring and evaluating drought disasters.
SWAT modelChishui River Basindaily runoffhydrological simulationdrought assessment
NETL
NSTL
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