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Uncertainty Analysis of Hydrological Drought Characteristics Using Latin Hypercube Sampling (Case Study: Minab Dam Watershed)

    Authors

    • faeze Ghasem Nezhad 1
    • Fazeli Mehdi 2
    • Omolbanin Bazrafshan
    • Mohammad Parvinnia 3

    1 Department of water resources

    2 Department of Water Resources Engineering

    3 Assistant Professor, Department of Civil Engineering, University of Yasuj, Yasuj, Iran.

,

Document Type : Research Paper

10.22059/jrwm.2019.276424.1356
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Abstract

Drought monitoring by the Standardized Runoff Index (SRI) presents some uncertainties, mainly dependent on the choice of the probability distribution used to describe the cumulative precipitation and on the characteristics of the dataset. In this study, uncertainty analysis for estimation of the hydrologic drought characteristics (intensity, duration and frequency) was performed. Four distribution functions, two time period (30 and 49 years), six time scales (3, 6, 9, 12, 24 and 48 months) and Latin hyper cube sampling (LHS) method ware used. For each event at per year and month, was generated 50000 random sampling.Then, lower and upper bands of certainty was calculated for confidence level of 95% . In addition to the drought characteristics (intensity, duration and frequency) were calculated for six time scales, four distribution functions and two length of time series . Investigation of the longest duration and highest intensities showed that an increase time scale led to decrease the frequencies of drought classes and as a result increase drought intensity and duration . Further, no significant difference in the assessment of intensity and duration was between various distribution functions, meanwhile significant difference was between normal compared to weibull and gamma for the estimation of drought frequency in short time scales (3 and 6 months). Results of this study emphasized that considering drought intensity and duration, the normal distribution function, 24-month time scale and 30-years’ time series had the largest uncertainty for hydrologic drought estimation.

Keywords

  • Confidence interval (CI)
  • Probability distribution function
  • Latin hypercube
  • Stochastic sample
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Journal of Range and Watershed Managment
Volume 72, Issue 2
September 2019
Pages 527-542
Files
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  • PDF 2.13 M
History
  • Receive Date: 20 February 2019
  • Revise Date: 30 September 2019
  • Accept Date: 07 September 2019
  • First Publish Date: 07 September 2019
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How to cite
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  • BibTeX
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Statistics
  • Article View: 215
  • PDF Download: 147

APA

Ghasem Nezhad, F., Mehdi, F., Bazrafshan, O., & Parvinnia, M. (2019). Uncertainty Analysis of Hydrological Drought Characteristics Using Latin Hypercube Sampling (Case Study: Minab Dam Watershed). Journal of Range and Watershed Managment, 72(2), 527-542. doi: 10.22059/jrwm.2019.276424.1356

MLA

faeze Ghasem Nezhad; Fazeli Mehdi; Omolbanin Bazrafshan; Mohammad Parvinnia. "Uncertainty Analysis of Hydrological Drought Characteristics Using Latin Hypercube Sampling (Case Study: Minab Dam Watershed)". Journal of Range and Watershed Managment, 72, 2, 2019, 527-542. doi: 10.22059/jrwm.2019.276424.1356

HARVARD

Ghasem Nezhad, F., Mehdi, F., Bazrafshan, O., Parvinnia, M. (2019). 'Uncertainty Analysis of Hydrological Drought Characteristics Using Latin Hypercube Sampling (Case Study: Minab Dam Watershed)', Journal of Range and Watershed Managment, 72(2), pp. 527-542. doi: 10.22059/jrwm.2019.276424.1356

VANCOUVER

Ghasem Nezhad, F., Mehdi, F., Bazrafshan, O., Parvinnia, M. Uncertainty Analysis of Hydrological Drought Characteristics Using Latin Hypercube Sampling (Case Study: Minab Dam Watershed). Journal of Range and Watershed Managment, 2019; 72(2): 527-542. doi: 10.22059/jrwm.2019.276424.1356

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