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Debris Flow Hazard Zoning in Tehran Urban Watersheds by Two Methods

Zangeneh-Madar, Zahra | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42283 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tajrishi, Massoud; Pak, Ali
  7. Abstract:
  8. Iran like other Developing countries is prone to natural disasters. Not only these countries are situated in areas exposed to geological and climatic hazards, but they most significantly lack policies for hazard prevention and mitigation. A considerable amount of residential areas and installations in Tehran are on the mountainous hillsides, therefore the risk related to debris flows has been enlarged. Debris flows represent one of the most dangerous geomorphologic hazards that occur in mountainous areas. Their high mobility can cause damage, not only inside and adjacent to the torrent, but also on the debris fan. The main purpose of this thesis is to present a straight forward procedure to carry out a comprehensive debris flow hazard assessment at a regional scale by means of Geographical Information System. The methodology was applied to eight of the urban catchments in Tehran with high potential of debris flow. High erosion potential and uplift rate of formations together with the specific stratigraphy have increased the amount of sediment and debris near the river and alluvial fan. Thus, a triggering rainfall would possibly result in a debris flow. The availability of remote sensing and GIS technologies has tremendously helped the preparation of hazard maps with greater efficiency and accuracy than before. In this study a number of data layers on parameters related to the occurrence of debris flows, viz., slope, aspect, planar and profile curvature, landuse, lithology and stream network have been generated. Applying the bivariate and the expert evaluation methods, the final hazard map constitutes of five susceptibility levels
  9. Keywords:
  10. Tehran ; Debris Flow ; Bivariate Method ; Expert-Evaluation Method ; Geographic Information System (GIS)

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