Slope Stability Assessment and Landslide Susceptibility Map Production of Wadi Dhahr Area, Northwest of Sana’a, Yemen

Barahim Adnan A., Khanbari Khaled M., Algodami Amal F., Almadhaji Ziad A., Adris Ahmed M.

Abstract


A slope stability assessment of Wadi Dhahr area, located northwest of Sanaa the capital of Yemen, was carried out in this study. The study area consists of sandstone and volcanic rocks that are deformed by number of faults, joints and basaltic dykes. All the important factors affecting slope stability in the area such as slope angle, slope height, discontinuities measurements, weathering, vegetation cover, rainfall and previous landslides were evaluated. The study was conducted based on the integration of field investigation and satellite image processing. A landslide susceptibility map was produced with the Landslide Possibility Index (LP1) System, and the correlation values were computed between the factors measured and Landslide Possibility Index values. The fractures counted by satellite image were categorised according to their length and zones based on their concentrations. It was found that plain sliding and rockfall are the main modes of failure in the area, while rolling and toppling are rare. Some remedial measures are proposed to protect the slopes where it is needed,  such as the removal of rock overhangs, unstable blocks and trees, and by supporting the toe of slopes and overhanging parts by retaining walls and erecting well sealed drainage conduits. The results will assist in slope management and land use planning in the area.


Keywords


Landslide; LPI; Susceptibility Map; Structure; Wadi Dhahr; Yemen

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DOI: http://dx.doi.org/10.24200/squjs.vol23iss2pp120-136

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Copyright (c) 2018 Adnan A. Barahim, Khaled M. Khanbari, Amal F. Algodami, Ziad A. Almadhaji, Ahmed M. Adris

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