Effects of Kernel Functions on SPEI and Drought Characteristics (Case Study: Zayandeh Roud Basin)

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MOUSAVI S.M.; SHOKOOHI A.R.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2019 | Volume:15 | Issue:2 Page(s): 162-175

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Information Journal Paper

Title

Effects of Kernel Functions on SPEI and Drought Characteristics (Case Study: Zayandeh Roud Basin)

Author(s)

MOUSAVI S.M. | SHOKOOHI A.R. | Issue Writer Certificate

Keywords

SPEIQ1

Kernel FunctionQ1

Drought DurationQ1

Drought MagnitudeQ1

Drought SeverityQ1

Abstract

Drought management and planning are based on recognizing drought characteristics and its spatial and temporal extent. In the present research, SPEI12 was calculated using 4 kernels including rectangular, triangular, circular and Gaussian at 12 climatological stations in Zayandeh Roud watershed. Four important characteristics of drought including the time of occurrence, duration, magnitude and severity were evaluated by applying the highest weight to the 5th month. It was revealed that other kernels were more sensitive in recognizing the four drought characteristics compared to rectangular. While the rectangular kernel showed the highest coefficient of variation (CV) in Drought Duration, the Gaussian kernel had the least CV in duration and magnitude and the circular kernel the least CV in severity. Moreover, it was found that the Gaussian kernel was more successful in detecting the occurrence of drought in comparison with others. Finally, the results of this research indicated that rectangular kernel i. e. using equal weights for all months in deriving SPEI, may lead to overestimate or underestimate drought characteristics.

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APA: Copy

MOUSAVI, S.M., & SHOKOOHI, A.R.. (2019). Effects of Kernel Functions on SPEI and Drought Characteristics (Case Study: Zayandeh Roud Basin). IRAN-WATER RESOURCES RESEARCH, 15(2 ), 162-175. SID. https://sid.ir/paper/100224/en

Vancouver: Copy

MOUSAVI S.M., SHOKOOHI A.R.. Effects of Kernel Functions on SPEI and Drought Characteristics (Case Study: Zayandeh Roud Basin). IRAN-WATER RESOURCES RESEARCH[Internet]. 2019;15(2 ):162-175. Available from: https://sid.ir/paper/100224/en

IEEE: Copy

S.M. MOUSAVI, and A.R. SHOKOOHI, “Effects of Kernel Functions on SPEI and Drought Characteristics (Case Study: Zayandeh Roud Basin),” IRAN-WATER RESOURCES RESEARCH, vol. 15, no. 2 , pp. 162–175, 2019, [Online]. Available: https://sid.ir/paper/100224/en

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