Rainfall trends in twentieth century over Kerala,India |
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| Authors: | K.N. Krishnakumar G.S.L.H.V. Prasada Rao C.S. Gopakumar |
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| Affiliation: | 1. Department of Water Resource Development and Management, Indian Institute of Technology Roorkee, Roorkee 247 667 UK, India;2. Department of Civil Engineering, Malaviya National Institute of Technology, Jaipur, Rajasthan, India;3. Department of Bioresource Engineering, McGill University, Quebec, Canada;1. Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pashan, Pune 411008, India;2. Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon 425001, India;3. CORAL, Indian Institute of Technology Kharagpur, India;1. Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur 721 302, India;2. Vinod Gupta School of Management, Indian Institute of Technology, Kharagpur 721 302, India;3. National Remote Sensing Centre, ISRO, Hyderabad, India;4. Department of Civil and Environmental Engineering, Tokyo Metropolitan University, Japan |
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| Abstract: | Attempts were made to study temporal variation in monthly, seasonal and annual rainfall over Kerala, India, during the period from 1871 to 2005. Longterm changes in rainfall determined by Man-Kendall rank statistics and linear trend. The analysis revealed significant decrease in southwest monsoon rainfall while increase in post-monsoon season over the State of Kerala which is popularly known as the “Gateway of summer monsoon”. Rainfall during winter and summer seasons showed insignificant increasing trend. Rainfall during June and July showed significant decreasing trend while increasing trend in January, February and April. Hydel power generation and water availability during summer months are the concern in the State due to rainfall decline in June and July, which are the rainiest months. At the same time, majority of plantation crops are likely to benefit due to increase in rainfall during the post-monsoon season if they are stable and prolonged. |
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