Journal of Computer and Mathematical Sciences, Vol.10(6),1236-1243 June 2019 ISSN 0976-5727 (Print) (An International Research Journal), www.compmath-journal.org ISSN 2319 - 8133 (Online) Rainfall Trend Analysis for Karnataka State with Spatial Distribution G. Nanjundan, Nanjundappa Gari Keerthy* and Sadiq Pasha Department of Statistics, Bangalore University Bengaluru 560 056, INDIA. email:
[email protected]* (Received on: March 12, 2019) ABSTRACT The aim of this paper is to understand and find talukwise rainfall climatic trends with spatial distribution based on 57 years of rainfall data for all the 175 taluks of Karnataka State. It is important to study the degree and direction of the rainfall trend for planning and understanding the climatic phenomena in local scale with spatial variation and distribution. Sen’s slope and Mann-kendall non parametric test employed. The observed trend are classified and the results are represented in maps. Keywords: Rainfall Trend, Spatial distribution, Sen’s Slope, Mann-kendall statistics. 1. INTRODUCTION Karnataka is one of the southern state of India having geographical area of 1, 92,000 sq.km. Though it has a cultivable area of 1, 03,810 sq.km,only 20% of it is under irrigation. The climate of the State is determined mainly by the geographical location with respect to the sea, monsoon winds and physiography. Karnataka State has very moist monsoon climate on the West Coast, semi-arid climate in the Western Ghats and arid (very warm) climate in central and northern districts. The year is divided into three season’s viz., Pre Monsoon season from Jan to May; South-West monsoon from June to September; North East monsoon season from October to December; Karnataka State is divided into four regions.