Abstract
The significance of the trends was tested by Mann-Kendall test for annual and seasonal rainfall. Among the 14 taluks, only Hassan taluk shows a significant positive trend in annual rainfall while eight taluks have shown non-significant positive trend and remaining five taluks have shown non-significant negative trend. The annual rainfall for the entire zone have shown non-significant positive trend. For the SWM season, Alur taluk shows a significant negative trend and eight taluks have shown non-significant positive trend. However, five taluks and whole zone showed a non-significant negative trend. Southwest monsoon and annual rainfall in Bhadravathi taluk was increased in 2007 (571.9 mm to 785.1 mm and 857.6 mm to 1090.9 mm, respectively) and in Shivamogga, the change in annual rainfall was decreased during 1983 (1497.5 mm to 944.0 mm) and 2011 (944.0 mm to 796.6 mm). The northeast monsoon rainfall was increased during 1992 (134.3 mm to 441.1 mm) and it was decreased during 1994 (441.1 mm to 162.0 mm) in Shikaripura taluk. Similarly, in Hunsur taluk, the SW Monsoon rainfall has increased (701.8 mm to 1010.2 mm) during 1991 and it was decreased during 2001 (1010.2 mm to 723.3 mm), in Periyapatna and Honnali taluk, Northeast monsoon rainfall has decreased during 2012 and 2011, respectively.
Highlights
Climate change becomes a threat and it affects mainly on rainfall and temperature in various parts of the globe and seeks much attention to it (Yang et al, 2012)
Many studies conducted across the globe have shown variations in rainfall patterns over time (Altava-Ortiz et al, 2011)
Any change in precipitation has an effect on water resource management, fresh water accessibility and food production as well as nutritional security, both directly and indirectly (Hu et al, 2017)
Summary
Climate change becomes a threat and it affects mainly on rainfall and temperature in various parts of the globe and seeks much attention to it (Yang et al, 2012). The cumulative sums are computed as follows: Change point detection of seasonal rainfall in Karnataka Among the 14 taluks only Hassan taluk shows significant positive trend in annual rainfall and eight taluks
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