Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-226
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
18 Jul 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Enhancing Flood Hazard Estimation Methods on Alluvial Fans Using an Integrated Hydraulic and Geological and Geomorphological Approach
Zeinab Mollaei1, Kamran Davary2, Seyed Majid Hasheminia2, Alireza Faridhosseini2, and Yavar Pourmohamad3 1Graduated MSc Student of Water Science & Engineering Dept., College of Agriculture, Ferdowsi University of Mashhad, P. O. Box: 91775-1163, Mashhad, Iran
2Faculty member of Water Science & Engineering Dept., College of Agriculture, Ferdowsi University of Mashhad, P. O. Box: 91775-1163, Mashhad, Iran
3PhD student of Water Science & Engineering Dept., College of Agriculture, Ferdowsi University of Mashhad, P. O. Box: 91775-1163, Mashhad, Iran
Abstract. Due to the uncertainty concerning the location of flow paths on active alluvial fans, alluvial fan floods could be more dangerous than riverine floods. FEMA used a simple stochastic model named FAN in this regard for many years. In the last decade, this model has been criticized as a consequence of developing complex computer models. Instead, more recent hydraulic models with capability of avulsion simulation were recommended. This study was conducted on three alluvial fans located in the northeast and southeast part of Iran using combination of FAN model, FLO-2D model and geomorphological information. Initial stages included three steps: (a) identifying the alluvial fans' landforms, (b) determining the active and inactive areas of alluvial fans, and (c) delineating 100-year flood within these selected areas. This information was used as an input in the mentioned three approaches of: (I) FLO-2D model, (II) geomorphological method, and (III) FAN model. Thereafter, the results of each model were obtained and Geographical Information System (GIS) layers were created and overlaid. Afterwards, using a scoring system, the results were summarized and then the integrated method was compared with the three approaches.

Citation: Mollaei, Z., Davary, K., Hasheminia, S. M., Faridhosseini, A., and Pourmohamad, Y.: Enhancing Flood Hazard Estimation Methods on Alluvial Fans Using an Integrated Hydraulic and Geological and Geomorphological Approach, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-226, in review, 2017.
Zeinab Mollaei et al.
Zeinab Mollaei et al.
Zeinab Mollaei et al.

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Short summary
This study was conducted on three alluvial fans located in Iran using combination of FAN model, FLO-2D model and geomorphological information. Initial stages included three steps: (a) identifying the alluvial fans' landforms, (b) determining the active and inactive areas of alluvial fans, (c) delineating 100-year flood within these selected areas. It is suggested that HEC-RAS model be used along with FAN model and geomorphological approach and the pertaining results be validated by FLO-2D model.
This study was conducted on three alluvial fans located in Iran using combination of FAN model,...
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