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• W2185038583 abstract "Iran like other Developing countries is prone to natural disasters. According to a recent IEEA report, Iran has been classified among the 10 most disastrous countries in the world and it is estimated that damages due to the natural hazards are about 10% of GDP. 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. Similar to most other regions of the world, deficiencies in infrastructure and inadequacy of disaster plans and hazard maps are paid off by human lives in Iran. Disaster plans provide the residents with information of the possibility of a natural hazard occurrence and the potential degree of damage. They also facilitate policy makers in working out rational regional development plans and risk management. Tehran, the capital of Iran, is located in the southern hillside of the central Alborz mountain range and on the alluvial fans of central Iran. Therefore, a considerable amount of residential areas and installations are on the mountainous hillsides, because urbanization on fans has strongly increased in Tehran, 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 paper 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 one of the urban catchments in Tehran with high potential of debris flow. The study area covers a region of about 23 km 2 in the NW of Tehran. 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 method, the final hazard map constitutes of five susceptibility levels. It is of extreme importance in terms of mitigation and prevention of loss to lives and properties, that the canal passing through the study area be cleaned, widened and deepened, a protective zone of 10 m in width on either side of the canal be established and construction in the vicinity of the river bank be limited." @default.
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• W2185038583 date "2011-09-05" @default.
• W2185038583 modified "2023-10-17" @default.
• W2185038583 title "Debris flow hazard zoning in urban watersheds using the bivariate method, a case study in Tehran, Iran" @default.
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• W2185038583 doi "https://doi.org/10.5242/iamg.2011.0297" @default.
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