International Geologiical Congress - Oslo 2008

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GTE-01 General contributions to engineering geology and geotechnics

 

Environmental consequence of unplanned urbanization and landslide hazards in Chittagong City, Bangladesh

 

A.T.M. Shakhawat Hossain, Jahangirnagar University (Bangladesh)
 

 

Chittagong is the commercial capital of Bangladesh, which is expanding rapidly. Chittagong city lies in the south eastern folded belt of the Bengal basin. Several hill ranges of the folded belt comprise of Mio-pliocene sediments (viz. Sandstone, Shale and Clay) of shallow marine to deltaic origin. Beside the natural factors, human activities and unplanned urbanization probably intensified the frequency and magnitude of the landslide of this region. Recent landslides that occurred in Chittagong city in mid June, 2007 after a very heavy rainfall killed at least 200 people. These hazards also damage many properties in and around the hills including 500-600 cacha houses. It is observed that most of cutted hill slopes of the investigated area are too steep, excessive rainfall made these steep slopes unstable and landslide occurred near to the vicinity of the hill side slopes. As a result of population pressures, unplanned hill cutting at an accelerating rate in the city increases the risk for urban landslide triggered by rainfall. This studies also include estimation of triggering factors mainly rainfall, geotechnical characterization of soil in the unstable areas, identification of some potential risky slopes in the city area and some mitigation measures are recommended.

 

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