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Characteristics of Rainfall Erosivity based on Tropical Rainfall Measuring Mission data in Tibet, China

Journal of Mountain Science 2013年第6期10卷 1008-1017页

作者： FAN Jian-rong CHEN Yang YAN Dong GUO Fen-fen Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences University o f the Chinese Academy of Sciences Department of Geography and Environmental Sustainability University of Oklahoma

Rainfall erosivity in Tibet from 2000 to 2OlO was estimated based on simplified erosion prediction model using daily rainfall data derived from the Tropical Rainfall Measurement Misssion （trmm） 3b42 rainfall measurement algorithm. Semi- monthly erosive rainfall and rainfall erosivity were validated using weather station data. The spatial distribution of annual rainfall erosivity as well as its seasonal and annual variation in Tibet was also examined. Results showed that trmm 3b42 data could serve as an alternative data source to estimate rainfall erosivity in the area where only data from sparsely distributed weather stations are available. The spatial distribution of rainfall erosivity in Tibet generally resembles the distribution of multi-year average of annual rainfall. Annual rainfall erosivity in Tibet decreased from the southeast to the northwest. The concentration degree of rainfall erosivity shows an increasing trend from the southeast to the northwest. High rainfall erosivity accompanies low rainfall erosivity concentration degree and vice versa. Rainfall erosivity increased in the middle and western Tibet and decreased in the southeastern Tibet during the 11 years of this study.

关键词： Rainfall erosivity trmm 3b42 data Tibet Temporal distribution Spatial distribution

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