基于TRMM卫星雷达降雨的流域陆面水文过程

Study on watershed hydrologic processes using TRMM satellite precipitation radar products

利用热带降雨观测计划（TRMM）卫星雷达降雨数据驱动分布式陆面水文模型，研究流域尺度陆面水文过程，评估该数据在水文模拟与预报等研究领域的性能。通过与实测雨量资料比较，验证TRMM卫星雷达降雨数据的质量。分别将TRMM卫星雷达降雨与观测降雨作为耦合模型的气象输人，模拟和研究淮河流域1998～2003年的陆面水文过程时空变化。结果表明，TRMM卫星雷达降雨数据能够很好地描述降雨的时空分布，利用TRMM降雨模拟的结果与利用观测降雨模拟的结果精度相当；模拟流量与实测资料基本吻合。卫星雷达降雨数据在陆面水文过程研究中具有广泛的应用前景。

The objective of this study focuses on the application of the TRMM （Tropical Rainfall Measuring Mission） satellite precipitation radar data in the simulation of the land surface hydrologic processes and the evaluation of its performance in hydrologic simulation and forecast. The quality of the TRMM 3B42 rainfall data is validated with the gauged rainfall data in a 3 year period. Forced by the gauged and TRMM 3B42 rainfall data, two continuous hydrologic simulation cases are conducted to analyze the temporal variability and the spatial distribution of the hydrologic process in Huaihe River basin from 1998 to 2003. The analyses show that the TRMM rainfall is comparable to the gauged rainfall data in the hydrologic study. The simulated streamflow hydrograph with the TRMM rainfall is also consistent with the observed one at Bengbu station. Results indicate that the satellite radar rainfall has a promising prospect in the study of the land surface hydrologic processes.