Abstract

AbstractIn this paper, the variation in spatial and temporal scales of rainfall in and around Rasipuram Taluk, Tamil Nadu, India is presented in which agriculture is a major land use category. Daily rainfall data are collected for seven rain gauge stations namely, Kullampatti, Salem Junction, Sankagiri, Rasipuram, Senthamangalam, Thiruchengode and Gangavalli. The rainfall data are sorted into monthly, seasonal and average annual categories for assessment. The spatial distribution of rainfall during all the major seasons and average annual rainfall are plotted for better understanding of the spatial variability. Monthly rainfall analysis demonstrates that October month receives highest rainfall whereas lowest rainfall would usually be registered during January at all seven rain gauge stations considered. Annually, the highest rainfall is received in 2015, and least amount of rainfall is received in 2006. Northeast monsoon has the highest average rainfall of 374 mm when compared with all the other seasons during the study period from 2006 to 2015. Spatial analysis reveals that the major portion of the Rasipuram Taluk belongs to moderate rainfall category except in north east monsoon season. The regional level long term analysis of rainfall variation can depict exact trend which can be used for agricultural development plans in semiarid regions.KeywordsRainfall variationSpatial and temporal analysisRasipuram talukGIS

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