基于CLDAS-Prcp多源融合降水产品的WRFHydro模式在綦江流域的水文效用  

Hydrological Utility of CLDAS-Prcp Multi-source Fusion Precipitation Products in Qijiang River Basin—TakingWRF-Hydro Model as an Example

作　　者：粟运 师春香[2] 毛文书[1] 孙帅 谢冰绮 翟丹华 SU Yun;SHI Chunxiang;MAO Wenshu;SUN Shuai;XIE Bingqi;ZHAI Danhua(College of Atmospheric Sciences,CUIT,Chengdu 610225,Sichuan,China;National Meteorological Information Center,Beijing 100081,China;Pearl River Water Conservancy Research Institute of Pearl River Water Resources Commission,Guangzhou 510630,Guangdong,China;Chongqing Meteorological Observatory,Chongqing 401147,China)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]国家气象信息中心,北京100081 [3]珠江水利委员会珠江水利科学研究院,广东广州510630 [4]重庆市气象台,重庆401147

出　　处：《高原气象》2022年第3期617-629,共13页Plateau Meteorology

基　　金：国家重点研发计划项目(2018YFC1506604,2019YFA0606904);国家自然科学基金项目(NMICJY202104,NMICJY202106)。

摘　　要：为了提升对中小尺度流域的径流模拟和洪水预报能力,给防灾减灾和科学研究提供参考依据,本文评估了CLDAS-Prcp多源融合降水产品在中小尺度流域中的水文效用以及WRF-Hydro模式在中小尺度流域中的模拟效果。首先利用CLDAS-Prcp多源融合降水产品和IMERG-Final多源融合降水产品分析了綦江流域7个典型洪水个例中的累计降水量空间分布特征以及小时面雨量时序变化特征,再利用两种多源融合降水产品分别驱动WRF-Hydro模式对綦江流域7个典型的洪水个例进行模拟,并与实测径流量进行对比分析。结果表明:(1)CLDAS-Prcp在累计降水量空间分布上比IMERG-Final刻画出了更多的细节,大值落区和降水总量上也更为准确;两种降水产品都能较好地刻画流域小时面雨量在洪水时段的变化趋势,CLDAS-Prcp在面雨量峰值以及变化趋势上更贴近观测数据。(2)基于CLDAS-Prcp多源融合降水产品的4场径流模拟中,有3场径流模拟的纳什系数高于0.9,表现优异;基于IMERG-Final多源融合降水产品的4场径流模拟中,除20200622号洪水事件外,其余场次模拟的纳什系数皆低于0.7,说明基于CLDAS-Prcp融合降水产品的参数率定以及径流模拟要优于IMERG-Final融合降水产品。(3)WRF-Hydro模式可以很好模拟出洪水个例的洪峰流量,准确地再现了洪峰出现的时间,能够较好地刻画洪水过程的细节。总体而言,CLDAS-Prcp多源融合降水产品和WRF-Hydro模式可以很好地应用在中小尺度流域的水文模拟中。In order to evaluate the hydrological utility of CLDAS-Prcp multi-source fusion precipitation products and the simulation effect of WRF-Hydro model in small and medium-scale watersheds,Firstly CLDAS-Prcp and IMERG-Final multi-source fusion precipitation products are used to analyze the spatial distribution characteristics of cumulative precipitation and the time series change characteristics of hourly rainfall in seven typical flood cases in the Qijiang River basin,then the two products are respectively used to drive the WRF-Hydro models to simulate 7 typical flood cases in the Qijiang River basin.The outputs of the process are analyzed and compared with the measured flow.The results show that:(1)CLDAS-Prcp depicts more details than IMERG-Final in the spatial distribution of accumulated precipitation,and it is more accurate in terms of large-value drop areas and total precipitation;both precipitation products can well describe the change trend of the hourly surface rainfall in the basin during the flood period,and CLDAS-Prcp is closer to the observation data on the peak and the change trend of surface rainfall.(2)Based on the 4 runoff simulations of the CLDAS-Prcp multi-source fusion precipitation product,3 runoff simulations have a Nash coefficient higher than 0.9,showing excellent performance;among the 4 runoff models based on the IMERG-Final multi-source fusion precipitation product,except for the 20200622 flood event,the Nash coefficients of the other simulations are all lower than 0.7,indicating that the parameter calibration and runoff simulation based on the CLDAS-Prcp fusion precipitation product are superior to the IMERG-Final fusion precipitation product.(3)The WRF-Hydro model is able to simulate the individual flood peak flow,which can accurately reproduces the time when the flood peak appears,and well describe the details of the flood process.In general,the CLDAS-Prcp multi-source fusion precipitation product and the WRFHydro model can be well applied in the hydrological simulation of small and medium

关 键 词：CLDAS-Prcp 多源融合降水 IMERG-Final 径流模拟 洪水 WRF-Hydro模式 

分 类 号：P456.7[天文地球—大气科学及气象学]