Spatio-temporal analysis of rainfall extremes in the flood-prone Nagavali and Vamsadhara Basins in eastern India

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dc.contributor.authorRao, G. Venkataen
dc.contributor.authorReddy, K. Venkataen
dc.contributor.authorSrinivasan, Raghavanen
dc.contributor.authorSridhar, Venkataramanaen
dc.contributor.authorUmamahesh, N.V.en
dc.contributor.authorPratap, Devaen
dc.date.accessioned2020-08-06T17:58:56Zen
dc.date.available2020-08-06T17:58:56Zen
dc.date.issued2020-05-29en
dc.description.abstractUnderstanding the spatio-temporal distribution of rainfall characteristics has a major role in assessing the availability of water resources over a catchment. Therefore, it is necessary to understand the changes in rainfall characteristics using gridded precipitation data and robust statistical analysis for making decisions. In this study, the trends in rainfall and rainfall extremes over the Nagavali and Vamsadhara river basins are studied at three time steps (long-term-1901-2018, pre-1950, and post-1950) with four different Mann-Kendall (MK) tests using daily gridded rainfall data of 118 years (1901–2018). The spatial patterns of the trends are evaluated with the kriging interpolation method. Magnitude in rainfall and rainfall extremes (CDD, CWD, PRCPTOT, R10MM, R20MM, R40MM, R95PTOT, RX1DAY, and RX5DAY) are analyzed using the Sen’s slope method. Except in the monsoon season, a decreasing trend is observed in all the rainfall extremes in post-1950 compared to pre-1950 period. Whereas, in the monsoon an increasing trend is observed for the extremes in post-1950 period. Overall period (i.e, 1901–2018) an increasing trend is observed for rainfall and rainfall extremes in the pre-monsoon (March–May), monsoon (June–Sep) seasons and a decreasing trend in the winter season (Dec–Feb) for both the basins. No obvious trends are evident in the post-monsoon season (Oct–Nov). At the annual scale, rainfall and rainfall extremes exhibited an increasing trend. Overall, the Nagavali basin experienced more extreme rainfall events indicating the higher vulnerability of floods while the middle and lower portions of the Vamsadhara basin shown increase in extremes. When linked with hydrological analysis, insights gained from this study are useful for flood vulnerability mapping and risk assessment for both the basins.en
dc.description.sponsorshipThe research described in this paper is carried out with fund by Ministry of Human Resource Development (MHRD), Government of India under Scheme for Promotion of Academic and Research Collaboration (SPARC) through project number P270. The fourth author’s (V. Sridhar) effort was funded in part by the Virginia Agricultural Experiment Station (Blacksburg) and through the Hatch Program of the National Institute of Food and Agriculture at the United States Department of Agriculture (Washington, DC).en
dc.format.extent13 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.wace.2020.100265en
dc.identifier.urihttp://hdl.handle.net/10919/99593en
dc.identifier.volume29en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectRainfallen
dc.subjectExtremesen
dc.subjectMann-kendall testen
dc.subjectSen’s slopeen
dc.subjectKriging interpolationen
dc.titleSpatio-temporal analysis of rainfall extremes in the flood-prone Nagavali and Vamsadhara Basins in eastern Indiaen
dc.title.serialWeather and Climate Extremesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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