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University of Agricultural Sciences, Raichur (2017)

STUDIES ON TEMPORAL VARIATIONS OF CLIMATOLOGICAL PARAMETERS AT RAICHUR, KARNATAKA

MEENAKSHI BAI, H.

Titre : STUDIES ON TEMPORAL VARIATIONS OF CLIMATOLOGICAL PARAMETERS AT RAICHUR, KARNATAKA

Auteur : MEENAKSHI BAI, H.

Université de soutenance : University of Agricultural Sciences, Raichur

Grade : Master of Technology (Agricultural Angineering) 2017

Résumé
The detail analysis of temporal variations of climatological parameters and water balance parameters at Raichur has been carried out in the present study. The data on various climatological parameters of 35 years (1981–2015) and the data of sunshine hours for 17 years (1999-2015) were considered for the present study. The CV of annual rainfall during recent decade (2006-2015) was found to be higher (35.6%) in comparison to past 2.5 decades (1981-2005) CV value (25.9%) as well as long term (1981-2015) CV value (28.4%) indicating more erratic distribution of rainfall during recent decade. In the recent decade (2006-2015), except RH1 and RH2 remaining climatological parameters (Tmax, Tmin, Sunshine hours, evaporation and wind speed) were exhibited slightly decreasing trend in comparison to past 2.5 decades (1981-2005). The weekly mean reference evapotranspiration (ETo) ranged from 22.7 mm (48 and 49th SMW) to 52.3 mm (20th SMW) and weekly mean water deficit ranged from 4.3 (40th SMW) to 45.7 (19th SMW) respectively. The weekly mean water surplus ranged from 0.0 mm (all most all weeks except few weeks) to 23.9 mm (40th SMW). Among 17 years of study period of drought (1999-2015), drought frequency was observed to be one drought year for every 2.5-3years. The climatic condition at Raichur was found to swing from semi arid (13 years) to arid (4 years) during study period of 17 years (1999-2015). After the onset of monsoon, the length of growing season was observed to be 23 weeks (from 28th -50th SMW) for Raichur region

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