Abstract
Ouarsenis mountain range located in the NW of Algeria is affected by numerous slope instabilities: (i) rock falls, related to Jurassic limestone formation and (ii) landslides initiated on moderate slopes angles ranging from 11 to 22 %, which can be related to very sensible lithology (colluviums and turbidity). These slopes show an important fluid circulation activity. This circulation is ensured by a complex karstic system embedded within the limestone mountains in high altitude (>900 m). The rose diagrams establishing of faults lineation, landslides, and elongate slope axis show a strong coincidence between the tectonic fractures and the rupture axis (RA) of the landslides (N10°, N40°, N120°, N140°). The orientations of elongate slope axis coincide mainly with the directions ~N30° and ~N160. The north slopes are affected by a high number of identified landslides because these mountain sides correspond to wetland areas. The topographic and border conditions can highly control the geometry of the landslides: the type of slope and the spread in length of the destabilized materials are strongly related. This is confirmed by the possible linear fit which links the mobility index to the maximum length of the landslides, either with fluid flow or situated in the front of tectonics overlap; these two types of landslides are characterized by low coefficients of friction 0.23 and 0.24, respectively. The landslides situated above the geomorphologic knickpoint are represented by a higher friction coefficient (0.25), as well as landslides initiated in zones without seepage water (0.29): these different apparent friction values can explained the spread in length variability of the debris. Moreover, the high landslide zone is located near a seismic area which can be related to an active deformation process associated to seismogenic faults (e.g., the earthquake which occurred in the Chlef area in October 1980).
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The authors are indebted to the anonymous reviewer for the constructive remarks which helped improve the final version of the manuscript. The authors wish to thank the local village authorities of Bordj Bou Naama for ease of access in the field as well as the availability under our all documents necessary for the preparation of this work. One of the authors would like to thank the regional project Mistrals “ENVI-MED.”
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Mansour, Z., Miloud, B., Donzé, F. et al. Morphometric analysis of landslides in the Ouarsenis area (west Algeria): implications for establishing a relationship between tectonic, geomorphologic, and hydraulic indexes. Arab J Geosci 8, 6465–6482 (2015). https://doi.org/10.1007/s12517-014-1711-5
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DOI: https://doi.org/10.1007/s12517-014-1711-5