Pollution Research Paper

Vol.31, Issue 3, 2012; Page No.(493-497)

GIS APPROACH FOR RAINFALL FLUCTUATION STUDY IN OMALUR TALUK, SALEM DISTRIC, TAMILNADU, INDIA

D. KARUNANIDHI, G.VENNILA AND M. SURESH

Abstract

Rainfall is the major determinant of agricultural production, especially in rain fed areas. Since the contribution of rain fed agriculture is almost half to the national average in the present study, an attempt has been made to understand the rainfall fluctuation with respect to spatial distribution in Omalur Taluk, Salem district of South India 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 from 2001 to 2010. 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 620.32 km2 and 39.01km2 of the study area received high rainfall during the respective monsoon seasons. Annual average rainfall spatial distribution map for the years 2001-2010 revealed that 439.24 km2 of the study area falls under high rainfall zone in the study area. The results suggest that the model reproduces the number and spatial distribution maps of rainfall extremes with some accuracy, but that mean rainfall and rainfall variability is estimated over dry regions of Omalur Taluk in Salem District, South India.

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