Indian Journal of Science and Technology

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In the present study, an attempt has been made to understand the rainfall fluctuation with respect to spatial distribution in Salem district of Tamil Nadu through GIS Technique. To achieve the aim, rainfall variations during winter (Jan.&Feb.), summer (Mar. to May), southwest monsoon (Jun. to Sep.) and northeast monsoon (Oct. to Dec.) were analyzed for the period 1998 to 2007. These results were taken into GIS platform to prepare the spatial distribution maps. The spatial distribution maps of Southwest- and Northeast- monsoon season showed that 1775.65 Km2 and 430.48 Km2 of the study area received above 400 mm of rainfall during the respective monsoon seasons. Annual average rainfall spatial distribution map for the years 1998-2007 revealed that 3808 Km2 of the study area falls under less than 200 mm (poor category) of rainfall. It shows the annual average rainfall distribution is very low in the study area. The high rainfall domain occupies only 8.15 and 33.62% of the study area.

Keywords

GIS, PWD, Spatial Distribution, Monsoon Season, Rainfall, Tamil Nadu
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