STUDY OF DRY SPELLS IN YAVATMAL DISTRICT USING GEOINFORMATICS.
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Date
2018-08-03
Authors
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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 months are essential for crop planning and management of rainfed farming. The study on “Dry spells in Yavatmal 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 Yavatmal district according to Ashok Raj (1979) criteria.
The average monsoon seasonal rainfall in different taluka stations varied from 556.75 to 890.32 mm with coefficient of variation of 25 to 49 percent. The mean dates of onset and withdrawal of effective monsoon varied from 18th to 29th June and 17th September to 4rd October respectively at different taluka places in Yavatmal district. The average monsoon seasonal rainfall during low, medium and high rainfall years varied from 409.2 to 616.7 mm, 549.9 to 938.5 mm and 702.2 to 1201.0 mm respectively. The critical dry spells (CDS) in Yavatmal district varied from 1 to 3 in number during different years with an average of 2 Critical Dry Spells (CDS). The average starting date of CDS (in different monsoon months) varied from 19th to 28th June, from 13th to 24th July, from 12th to 20th August and from 6th to 19th September. 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 (except for 2 to 3 week duration dry spell) and July or June at almost of all talukas in Yavatmal district.
The spatial variation of probability of occurrence of different duration dry spells indicated the maximum chances of occurrence in Arni, Darwha, Digras, Yavatmal, Babulgaon and Ner talukas and some parts of Ghatanji, Mahagaon and Kalamb taluka as compared to remaining talukas in Yavatmal district. The temporal variation in occurrence of different duration dry spells in four monsoon months indicated higher temporal variation in number of occurrence of 2 to 3 weeks duration events in all the monsoon months, followed by 3 to 4 weeks duration dry spell event only in August and September month and 4 to 5 week duration dry spell events in the month of August in different talukas of Yavatmal district. The spatial variation of available water holding capacity of soil in different talukas of Yavatmal district indicated that the available water holding capacity of the soils in the study area varies from 10 to 14 cm per meter depth of soil
Description
For the assessment of onset of effective monsoon (OEM), dry spells and withdrawal of monsoon 20 years (1998 to 2017) daily rainfall data of sixteen talukas in Yavatmal district and 19 talukas from districts adjoining to Yavatmal district was analyzed. The average date of earliest, mean and delayed onset and withdrawal of effective monsoon was estimated. The critical dry spells at different taluka places of Yavatmal district during monsoon month were analyzed.
Keywords
Yavatmal dry season, Yavatmal wet season, Yavatmal seasonal variation, Yavatmal soil science and microbiology, Yavatmal soil texture, Yavatmal soil water, Yavatmal soil water holding capacity, Yavatmal soil wilting point, Statistics and experimentation, Data collection, Data analysis, Yavatmal district, Yavatmal dry spell, Geoinformatics, Yavatmal monsoon onset, Yavatmal monsoon withdrawal, Yavatmal dry spell spatial variability, Yavatmal dry spell temporal variability, Yavatmal soil moisture, Yavatmal base map, ArcGIS, Yavatmal critical dry spell, Yavatmal seasonal rainfall, Yavatmal soil field capacity, Yavatmal soil type, Yavatmal spell probability, Yavatmal effective monsoon early onset, Yavatmal effective monsoon mean onset, Yavatmal effective monsoon delayed onset, Yavatmal effective rainfall, Yavatmal spatial rainfall distribution, Yavatmal spatial monsoon duration, Climatology, Yavatmal altitude, Yavatmal arid climate, Yavatmal latitude, Yavatmal precipitation, Yavatmal topography, Yavatmal meteorology,
Citation
KOKATE, KIRAN M. (2018). Study of dry spells in Yavatmal district using geoinformatics. Department of Soil and Water Conservation Engineering (Agricultural Engineering), Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Tech. 2018. Print. xiv, 139p. (Unpublished).