STUDY OF DRY SPELLS IN WASHIM DISTRICT USING GEOINFORMATICS.
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Date
2017-10-10
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Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The success or failure of crops particularly under rainfed condition is closely linked with the amount and distribution pattern of rainfall. The knowledge of onset of effective monsoon (OEM), its withdrawal, period of occurrence and distribution of dry spells during monsoon month are essential for crop planning and management of rainfed farming. The study on “Dry spells in Washim district using geoinformatics” was undertaken with specific objectives of rainfall analysis at taluka level for onset of effective monsoon (OEM), dry spells and withdrawal of effective monsoon in Washim district according to Ashok Raj (1979) criteria. The spatial and temporal variation of dry spells at all the talukas of Washim district was analyzed using starting dates of dry spells of different severity/duration. The spatial variation of soil moisture availability in Washim district was also studied using geoinformatics.
The average monsoon seasonal rainfall in different taluka stations varied from 778.23 mm to 999.56 mm with coefficient of variation of 26 to 39 percent. The mean dates of onset and withdrawal of effective monsoon varied from 19th to 26th June and 24th September to 3rd October respectively at different taluka places in Washim district. The average monsoon seasonal rainfall during low, medium and high rainfall years varied from 490.60 to 678.58 mm, 694.77 to 928.23 mm and 988.53 to 1335.83 mm with coefficient of variation of 8 to 23, 2 to 13 and 8 to 25 respectively. The critical dry spells (CDS) in Washim district varied from 1 to 4 in number during different years with an average of 2 CDS. The average starting date of CDS (in different monsoon months) varied from 21th to 23th June, 14th to 18th July, 12th to 14th August and 10th to 18th September. The duration of critical dry spells is generally reduces from maximum number of days during low rainfall years to slightly less number of days during medium rainfall years followed by high rainfall years at almost all taluka places in Washim district. The highest probability of occurrence of dry spells of different duration (2 to 3, 3 to 4, 4 to 5 and more than 5 week) during August, followed by September and July or June at almost of all talukas in Washim district.
The spatial pattern of development of 3 to 4 week duration critical dry spell in Washim district indicated its initiation in northern part in Karanja taluka and spreads towards southern part of the district during July and September month, while during August a reverse trend of its beginning on southern part of the district was observed, which then spreads towards northern part of the district. The available soil moisture holding capacity was found to be 11 cm per meter depth of soil in maximum area of different talukas in Washim district.
Description
The knowledge of onset of effective monsoon (OEM), its withdrawal, period of occurrence and distribution of dry spells during monsoon month are essential for crop planning and management of rainfed farming. The study on “Dry spells in Washim district using geoinformatics” was undertaken with specific objectives of rainfall analysis at taluka level for onset of effective monsoon (OEM), dry spells and withdrawal of effective monsoon in Washim district according to Ashok Raj (1979) criteria. The spatial and temporal variation of dry spells at all the talukas of Washim district was analyzed using starting dates of dry spells of different severity/duration. The spatial variation of soil moisture availability in Washim district was also studied using geoinformatics.
Keywords
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Citation
CHAVHAN, ANIL G. (2017). Study of dry spells in Washim district using geoinformatics. Soil and Water Conservation Engineering (Agricultural Engineering), Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Tech. 2017. Print. xii, 105p. (Unpublished).