RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (01): 131-139.doi: 10.11870/cjlyzyyhj201601016

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COMPARATIVE STUDY ON VARIOUS RAINFALL DATA IN UPPER REACHES IN YANGTZE RIVER

YANG Xu, LIU Zhi-wu, LI Bo   

  1. China Three Gorges Corporation, Yichang 443000, China
  • Received:2015-05-06 Revised:2015-07-15 Online:2016-01-20

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Abstract: Rainfall is an important input factor of flood forecasting and a prerequisite for ensuring forecasting accuracy. This paper proposes a method to comprehensively evaluate and compare the accuracy of telemetry stations estimates at three spatial scales:point scale, sub-catchment scale and the whole-basin scale. Using this method, benchmarked against daily precipitation data that National Meteorological Information Center published, we evaluated the accuracy of the telemetry rainfall system with 377 gauges covering Yibin to Yichang, whose area is 425 000 km2. In daily and monthly time scale, we revealed the influencing factors and the characteristics of telemetry rainfall dataset of China Three Gorges Corporation. The results showed that the correlation of rainfall between the data was relatively high. The daily efficient coefficient of R2 reached 0.81. There are a few differences in the data which affected by such factors as the position and the terrain. These differences provide an important basis for the adjustment and supplement of the precipitation station. This article provides a paradigm to verify the accuracy of some rainfall data by telemetering stations. The method could evaluate the situation of the data by telemetering stations, and serve as a basis for the future study of multi-source data fusion of rainfall, improving the ground telemetry rainfall data of representative and accuracy.

Key words: rainfall, meteorology, hydrology, comparative

CLC Number: 

  • P426.61
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