| 摘要: |
| 【目的】基于SWAT模型，构建资料缺失条件下的综合干旱指数，为干旱特性的多角度分析提供支持。【方法】以甘肃省金塔河流域为研究对象，依据1981-2017年水文气象资料建立流域SWAT水文模型，通过SWAT-CUP对模型参数进行率定与验证，将模拟的土壤湿度、蒸散发数据与实测降雨、径流数据相结合，运用嵌套Archimedean构造联合多个干旱变量，构建参数化的气象-农业-水文综合干旱指数（comprehensive drought index，CDI），并分析所构建CDI的适用性。【结果】SWAT模型模拟的金塔河流域径流值与实测值吻合良好，率定期和验证期的确定性系数（R2）与Nash-Sutcliffe效率系数（ENS）均高于0.7，且不确定性分析指标P>0.7、R<1.5，均在可接受范围内，调整后的模型参数可用于描述金塔河流域的水文过程。所构建的参数化的气象-农业-水文CDI的干旱监测结果与实际干旱事件的发生基本一致，且能够监测到仅有1种或2种干旱发生的干旱区域，可同时表征气象干旱、农业干旱、水文干旱，能从多个角度反映干旱特性。CDI对金塔河流域东北部的气象干旱、农业干旱、水文干旱的监测能力较强；年尺度的CDI对气象干旱、农业干旱与水文干旱的监测能力强于季尺度与月尺度。【结论】所构建的CDI适用于金塔河流域气象-农业-水文综合干旱的监测，可为该地区干旱监测及旱灾预警提供支持。 |
| 关键词: SWAT模型 综合干旱指数 干旱监测 金塔河流域 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（51879222） |
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| Construction and applicability of a comprehensive drought index for Jinta River Basin based on SWAT |
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LIANG Zheng,SU Xiaoling
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| Abstract: |
| 【Objective】Based on the SWAT model,a comprehensive drought index under the condition of missing data was constructed to provide support for characterization of drought from multiple perspectives.【Method】The SWAT hydrological model for the Jinta River Basin was constructed with hydro-meteorological data from 1981 to 2017.The parameters of the model were calibrated and validated by SWAT-CUP.Simulated soil moisture and evapotranspiration data were combined with measured rainfall and streamflow data to construct meteorological-agricultural hydrological comprehensive drought index (CDI) by the Nested Archimedean Construction.Furthermore,the applicability of CDI was analyzed.【Result】The simulated values of Jinta River Basin by the SWAT model were in good agreement with measured values.The model evaluation indexes of R2 and ENS were higher than 0.7 in the calibration and validation periods.The model uncertainty was within the acceptable range of P>0.7 and R< 1.5.The adjusted model parameters can be used to describe hydrologic process of the basin.The drought monitoring results of constructed parameterized meteorological-agricultural hydrological CDI were basically consistent with the occurrence of actual drought events,and it can monitor arid areas with one or two drought events.CDI can simultaneously characterize meteorological,agricultural,and hydrological droughts,and describe droughts from multiple perspectives.CDI is more capable of monitoring meteorological drought,agricultural drought and hydrological drought in the northeastern part of the Jinta River Basin.The annual-scale CDI captured meteorological,agricultural and hydrological droughts better than seasonal and monthly scales.【Conclusion】The constructed CDI was suitable for the monitoring of meteorological,agricultural and hydrological droughts in the Jinta River Basin,and can provide theoretical basis for drought monitoring and early warning of droughts in this area. |
| Key words: SWAT model comprehensive drought index drought monitoring the Jinta River Basin |
