Landslide hazard zonation in high risk areas of Rethymno Prefecture,Crete Island,Greece |
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| Authors: | Maria Kouli Constantinos Loupasakis Pantelis Soupios Filippos Vallianatos |
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| Institution: | (1) Institute of Natural Resources and Natural Hazards, Center of Technological Research of Crete (CTRC), 3 Romanou, Chalepa, 73133 Chania, Crete Island, Greece;(2) Engineering Geology Department, Institute of Geology and Mineral Exploration (IGME), Olympic Village, Thrakomacedones, 13677 Athens, Greece |
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| Abstract: | The central part of Rethymnon Prefecture, Crete Island, suffers from severe landslide phenomena because of its geological
and geomorphological settings alternated by the human activities. The main landslide preparatory and triggering causal factors
are considered to be the ground conditions (lithology), geomorphological processes (fluvial erosion, etc.), and the man-made
actions (excavations, loading etc.). The purpose of this study is to develop a decision support and continuous monitoring
system of the area by composing landslide hazard and risk maps. For that reason, several approaches of the weighted linear
combination (WLC), a semi-quantitative hazard analysis method, were adopted in a Geographic Information Systems (GIS) environment.
The results were validated using a pre-existing landslide database enriched with new landslide locations mapped through image
interpretation of a processed IKONOS satellite image. The validation results showed that the WLC method coupled with remote
sensing (RS) and GIS techniques can support engineering geological studies concerning landslide vulnerability of hazardous
areas. |
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