Spatiotemporal distribution of precipitation in Guizhou and Guangxi karst mountainous regions based on satellite earth fusion data
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Abstract:
Mountainous area is the main producing area of river runoff. Systematically grasping the spatial and temporal distribution patter n of precipitation in mountainous area can provide important basic support for precise analysis of water circulation system and scientific formulation of water resources development and utilization strategy. Aimingt he lack of observation data in mountainous ar eas, this study developed a downscaling correction model for TRMM satellite precipitation data product in Guizhou and Guang xi karst mountainous region by using geographic weighted reg ression method and multiple linear regr ession met hod. The accuracy of dow nscaling correction results and their effects at different elevation intervals were analyzed, and summarized the temporal and spatial distribution of precipitation in the mountains. The results showed that : ( 1) the correction accuracy of the geographic weighted regression method was better than the multiple linear regr essionmethod, and the geographic weighted regr essionmethod performed better in the high altitude area at a significance level of A= 01 01; ( 2) the annual average precipitation in the study area showed high in the south, low in the north, high in the East and low in the west, characteristics and the annual distribution was uneven. Summer ( June2 August) precipitation was 74018 mm, accounting for 52% of the whole year ; ( 3) the spatial distribution of precipitation in the study area was closely related to the to pography. The elevation of lo w2altitude areas had a greater impact on precipitation, and the slope of high-altitude areas had a greater impact on precipitation.
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