SPATIAL AND TEMPORAL VARIATIONS ASSESSMENT OF SEASONAL AND ANNUAL DRY SPELLS IN KHORASAN PROVINCE

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FARIDHOSSEINI A.R.; ROSHANI A.; ERFANIAN M.; BANAYAN AVAL M.; ALIZADEH A.

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Journal: Journal of Water and Soil Year:2012 | Volume:26 | Issue:2 Page(s): 471-483

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Title

SPATIAL AND TEMPORAL VARIATIONS ASSESSMENT OF SEASONAL AND ANNUAL DRY SPELLS IN KHORASAN PROVINCE

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Keywords

SEASONAL AND ANNUAL DRY SPELLQ2

RELATIVE FREQUENCYQ2

MARKOV CHAINQ2

ZONINGQ2

KHORASANQ2

Abstract

Having sufficient knowledge about dry spells occurrence is essential to efficient management and planning of water resources usage. To reach this goal, this study was conducted to assess the continuity and frequency of dry spells, with using daily rainfall data of 12 synoptic stations of KHORASAN province in the available period to end of 2007. Dry spells’ relative occurrence frequency and also occurrence probabilities with the MARKOV CHAIN for all stations were determined seasonally and annually. Results of seasonally comparison of two mentioned methods show better efficiency of the MARKOV CHAIN to estimate the dry spells of winter and autumn than spring, summer and also annual ones. Also it has more precise results in long (20-30 days) dry spells than the medium and short (less than 20 days) periods. To assess the spatial variation of dry spells, the difference of frequency and MARKOV CHAINs’ mean values were zoned, both seasonally and annually. Results indicated that the MARKOV CHAIN is an efficient method for dry spell studding and its results is very close to the reality. One could conclude of the ZONING maps which the difference of Markov and observation method was so small in the north of the case study, but increases gradually towards the southern regions.

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APA: Copy

FARIDHOSSEINI, A.R., ROSHANI, A., ERFANIAN, M., BANAYAN AVAL, M., & ALIZADEH, A.. (2012). SPATIAL AND TEMPORAL VARIATIONS ASSESSMENT OF SEASONAL AND ANNUAL DRY SPELLS IN KHORASAN PROVINCE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 26(2), 471-483. SID. https://sid.ir/paper/141350/en

Vancouver: Copy

FARIDHOSSEINI A.R., ROSHANI A., ERFANIAN M., BANAYAN AVAL M., ALIZADEH A.. SPATIAL AND TEMPORAL VARIATIONS ASSESSMENT OF SEASONAL AND ANNUAL DRY SPELLS IN KHORASAN PROVINCE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2012;26(2):471-483. Available from: https://sid.ir/paper/141350/en

IEEE: Copy

A.R. FARIDHOSSEINI, A. ROSHANI, M. ERFANIAN, M. BANAYAN AVAL, and A. ALIZADEH, “SPATIAL AND TEMPORAL VARIATIONS ASSESSMENT OF SEASONAL AND ANNUAL DRY SPELLS IN KHORASAN PROVINCE,” JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 26, no. 2, pp. 471–483, 2012, [Online]. Available: https://sid.ir/paper/141350/en

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