Abstract
Since creation of spatial data is a costly and time consuming process, researchers, in this domain, in most of the cases rely on open source spatial attributes for their specific purpose. Likewise, the present research aims at mapping landslide susceptibility at the metropolitan area of Chittagong district of Bangladesh utilizing obtainable open source spatial data from various web portals. In this regard, we targeted a study region where rainfall induced landslides reportedly causes causalities as well as property damage each year. In this study, however, we employed multi-criteria evaluation (MCE) technique i.e., heuristic, a knowledge driven approach based on expert opinions from various discipline for landslide susceptibility mapping combining nine causative factors—geomorphology, geology, land use/land cover (LULC), slope, aspect, plan curvature, drainage distance, relative relief and vegetation in geographic information system (GIS) environment. The final susceptibility map was devised into five hazard classes viz., very low, low, moderate, high, and very high, representing 22 km2 (13%), 90 km2 (53%); 24 km2 (15%); 22 km2 (13%) and 10 km2 (6%) areas respectively. This particular study might be beneficial to the local authorities and other stake-holders, concerned in disaster risk reduction and mitigation activities. Moreover this study can also be advantageous for risk sensitive land use planning in the study area.
Highlights
Due to its geographical position and diversified terrain condition, Chittagong district is one of the hotspot areas for landslide hazard in Bangladesh
We employed multi-criteria evaluation (MCE) technique i.e., heuristic, a knowledge driven approach based on expert opinions from various discipline for landslide susceptibility mapping combining nine causative factors—geomorphology, geology, land use/land cover (LULC), slope, aspect, plan curvature, drainage distance, relative relief and vegetation in geographic information system (GIS) environment
Susceptibility maps based on these three classification schemes were subsequently cross checked with the landslide inventory of Chittagong district [67]
Summary
Due to its geographical position and diversified terrain condition, Chittagong district is one of the hotspot areas for landslide hazard in Bangladesh. Landslide events struck this area frequently—resulting in casualties, property damage, and economic loss [1]. In the recent past, the trend and frequency of landslides in this region are found to be increased within a short while, which were triggered by extensive rainfall [2]. Like Dhaka, the capital city of Bangladesh, Chittagong is the second choice for settlement and/or employment among the people for playing a substantial role in the economic development of Bangladesh. Landslide intensity zonation using geospatial data (accurate both in scale and resolution) becomes one of the key prerequisites while dealing with the hazard assessment in the study area
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