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Causes and consequences of recent floods in the Golestan catchments and Caspian Sea regions of Iran

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Abstract

In August 2001, the worst flash flooding event of the Caspian Sea regions in over two centuries claimed over 300 lives after a weekend of heavy rainfall and brought about a devastating disaster in the Mother-Soo catchment, province of Golestan, Iran. As a result of this event, a series of site investigation were carried out to identify the pertinent factors that led to a flood of this magnitude. This paper identifies the fundamental causes of the frequent floods and debris flow occurrence in the area prone to flooding and analyzes the main runoff mechanism of these events. The maximum observed 24-h rainfall depths and maximum peak discharges at the existing gauges were compared with the depths of rainfall and the peak values corresponding to the August 2001 flood respectively. For the majority of the rain gauges, the rainfall depth exceeded those of historical recorded events. In Golestan dam, an increase of 7.5 times the maximum value observed in the past 20 years was noted. The flood height was 10–15 m while passing through the middle subcatchment area of Golestan National Park. The preliminary evaluation indicates the existence of bare soil in the catchment, movable material, steep slopes, high rainfall intensity, deterioration of pasture and forest land, and inappropriate agriculture and development practices as well as climate change were the main factors for the occurrence and the extent of the August 2001 disaster. Finally, due to the likelihood of flooding and debris flow events in future, some countermeasures are proposed.

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Acknowledgments

The authors sincerely thank two anonymous reviewers and the chief editor Professor Thomas Glade for reviewing the manuscript and providing critical comments to improve the paper. The work presented in this paper was financially supported by Persian Watershed, Forest & Rangelands Organization, Ministry of Jihad-e- Agriculture, Govt. of Iran.

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Authors and Affiliations

  1. Soil Conservation and Watershed Management Research Institute (SCWMRI), P.O. Box 13445, Tehran, Iran

    Forood Sharifi

  2. Hydro-environmental Research Centre, School of Engineering, Cardiff University, Cardiff, CF243AA, UK

    S. Zahra Samadi & Catherine A. M. E. Wilson

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  1. Forood Sharifi
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  2. S. Zahra Samadi
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  3. Catherine A. M. E. Wilson
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Correspondence to S. Zahra Samadi.

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Sharifi, F., Samadi, S.Z. & Wilson, C.A.M.E. Causes and consequences of recent floods in the Golestan catchments and Caspian Sea regions of Iran. Nat Hazards 61, 533–550 (2012). https://doi.org/10.1007/s11069-011-9934-1

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  • DOI: https://doi.org/10.1007/s11069-011-9934-1

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