Adaptability of TRMM Satellite Rainfall Data in Feilaixia Catchment of Beijiang River Basin
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Abstract:
In recent years,the accuracy and applicability of TRMM satellite rainfall data have attracted much attention.In this study,we evaluated the TRMM data set over the Feilaixia catchment of the Beijiang river basin from 1998 to 2015 using gauged rainfall data from 24 stations. We first evaluated the accuracy of the TRMM at daily scale by using eight statistical performance indices.Then we used three consecutive extreme indices,including consecutive dry days (CDD),consecutive wet days (CWD),and maximum consecutive 5day precipitation (RX5day), together with Cox-Stuart test method to explore the extreme consecutive climate and its trends in the catchment,with special focus on the ability of TRMM in capturing consecutive extreme rainfall.The results revealed that (1) TRMM had better precision and accuracy in regions with low latitude and low altitude,but in regions with high latitude and large topographic changes,it performed poorly and was prone to false alarms and errors.(2) TRMM tended to underestimate CWD and RX5day (in the post-flood period) and it could capture the consecutive drought trends in the western part of the catchment,but failed to capture the significant increase trends of consecutive rainfall in the southeastern part.The conclusions obtained in this study can provide a scientific basis for water resources management and runoff monitoring within the catchment,and can also be used as reference for catchments with similar latitudes.
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