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Hydrologic Evaluation of TRMM Multisatellite Precipitation Analysis for Nanliu River Basin in Humid Southwestern China

机译：西南湿润地区南流河流域TRMM多卫星降水分析的水文评估

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摘要

The accuracy of Tropical Rainfall Measuring Mission (TRMM) multi-satellite precipitation analysis (TMPA) daily accumulated precipitation products (3B42RTV7 and 3B42V7) was evaluated for a small basin (the Nanliu river basin). A direct comparison was performed against gauge observations from a period of 9 years (2000–2009) at temporal and spatial scales. The results show that the temporal-spatial precipitation characteristics of the Nanliu river basin are highly consistent with 3B42V7 relative to 3B42RTV7, with higher correlation coefficient (CC) approximately 0.9 at all temporal scales except for the daily scale and a lower relative bias percentage. 3B42V7 slightly overestimates precipitation at all temporal scales except the yearly scale; it slightly underestimates the precipitation at the daily spatial scale. The results also reveal that the precision of TMPA products increases with longer time-aggregated data, and the detection capability of daily TMPA precipitation products are enhanced by augmentation with daily precipitation rates. In addition, daily TMPA products were input into the Xin’anjiang hydrologic model; the results show that 3B42V7-based simulated outputs were well in line with actual stream flow observations, with a high CC (0.90) and Nash-Sutcliffe efficiency coefficient (NSE, 0.79), and the results adequately captured the pattern of the observed flow curve.
机译：对于一个小流域（南流河流域），评估了热带降雨测量任务（TRMM）多卫星降水分析（TMPA）日累积降水量（3B42RTV7和3B42V7）的准确性。在时间和空间尺度上与9年（2000-2009年）期间的观测观测值进行了直接比较。结果表明，南流河流域的时空降水特征与3B42V7相对于3B42RTV7高度一致，除日尺度外，所有时间尺度上的相关系数（CC）均约为0.9，相对偏倚百分比较低。 3B42V7略高估了除年尺度以外的所有时间尺度的降水；它稍微低估了每日空间尺度上的降水。结果还表明，随着时间的累积数据的增加，TMPA产品的精度会提高，并且每日降水速率的增加会增强每日TMPA降水产品的检测能力。此外，每天将TMPA产品输入到新安江水文模型中。结果表明，基于3B42V7的模拟输出与实际的流量观测非常吻合，具有较高的CC（0.90）和Nash-Sutcliffe效率系数（NSE，0.79），并且该结果足以捕获观测到的流量曲线的模式。

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