Determining the severity and duration of hydrological drought by using power laws analysis in Gorganroud Watershed rivers

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MOSTAFAZADEH RAOOF; Haji Khadijeh; ESMALI OURI ABAZAR

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Journal: GEOGRAPHIC SPACE Year:2018 | Volume:18 | Issue:62 Page(s): 237-252

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Title

Determining the severity and duration of hydrological drought by using power laws analysis in Gorganroud Watershed rivers

Author(s)

MOSTAFAZADEH RAOOF | Haji Khadijeh | ESMALI OURI ABAZAR | Issue Writer Certificate

Keywords

Occurrence sequence patternQ1

Double logarithmic plotQ1

Power law analysisQ1

Hydrologic flow deficitQ1

Abstract

Introduction Monitoring and prediction of hydrologic droughts and determining the onset and duration of drought spells have an important role in water resources management and planning to reduce the adverse effects of drought. In the present study the characteristics of hydrological drought in daily discharge time series from 20 hydrometric stations in Golestan Province have been analyzed. Matherials & Methods: In this study, the onset and end of drought periods, mean discharge, effective discharge and threshold level were calculated and then sequence number of 1 to 30-month durations were determined. According to the results of Power Laws Analysis, the intensity and duration patterns of hydrological drought periods were distinguished. The results specified an inverse relationship between the intensity and duration of wet and dry spells. The highest severity of dry spell is related to Nodeh station (Line slope=-0. 26) and the highest intensity of wet spell was observed in Ramian station (Line slope =-0. 28) which indicated the stability of dry and wet river flow regimes in Nodeh and Ramian stations. Also, the longest durations of dry and wet periods were determined for the Aghghala (32. 89) and Basirabad (16. 29) stations, respectively, which represents the average maximum probable durations. Discussion of Results & Conclusions: The proximity, closeness to a straight line or parallel lines without intersection proved the homogeneity regime of wet-dry spells in the Gorganroud watershed. Analysis of wet-dry spells using the Power Laws technique provides a basis to determine the flow regime, severity and duration of hydrological drought.

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APA: Copy

MOSTAFAZADEH, RAOOF, Haji, Khadijeh, & ESMALI OURI, ABAZAR. (2018). Determining the severity and duration of hydrological drought by using power laws analysis in Gorganroud Watershed rivers. GEOGRAPHIC SPACE, 18(62 ), 237-252. SID. https://sid.ir/paper/91711/en

Vancouver: Copy

MOSTAFAZADEH RAOOF, Haji Khadijeh, ESMALI OURI ABAZAR. Determining the severity and duration of hydrological drought by using power laws analysis in Gorganroud Watershed rivers. GEOGRAPHIC SPACE[Internet]. 2018;18(62 ):237-252. Available from: https://sid.ir/paper/91711/en

IEEE: Copy

RAOOF MOSTAFAZADEH, Khadijeh Haji, and ABAZAR ESMALI OURI, “Determining the severity and duration of hydrological drought by using power laws analysis in Gorganroud Watershed rivers,” GEOGRAPHIC SPACE, vol. 18, no. 62 , pp. 237–252, 2018, [Online]. Available: https://sid.ir/paper/91711/en

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