基于改进的湿润地区站点与卫星降雨数据融合的洪水预报精度分析

目前卫星降雨数据是水文研究中重要的数据来源,但其精度尚未达到洪水预报的要求。将TRMM3B42RT、TRMM 3B42、GPM IMERG Early及GPM IMERG Late分别与站点实测降雨数据融合,并利用HEC-HMS模型进行洪水模拟,从而改进卫星降雨洪水预报精度。结果表明,卫星降雨数据在经过与实测降雨数据的融合处理后,误差明显降低,相关系数由0.7提高到0.9以上,进而提高了模拟洪水的精度,在洪水预报方面有一定的可行性。

Accuracy Analysis of Flood Forecasting Based on the Fusion Data of Satellite and Gauge Rainfalls in Humid Region

Recently, satellite rainfall data has become the important source in hydrology research while its accuracy does not meet the requirements of flood forecasting. The TRMM 3B42RT, TRMM 3B42, GPM IMERG Early, and GPM IMERG Late were selected to respectively integrated with the gauged data, and hydrologic engineering center''s-hydrologic modeling system (HEC-HMS) model was used to simulate flood so as to improve the accuracy of flood forecasting with the satellite rainfall data. The results show that the error reduces significantly by merging gauge and satellite rainfall data, and the Nash-Sutcliffe efficiency coefficient increases from 0.7 to above 0.9. The accuracy of simulated flood has improved, and it has certain availability in flood forecasting.