Multi-Hazard Susceptibility Assessment Using the Analytical Hierarchy Process in Coastal Regions of South Aegean Volcanic Arc Islands
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Published:2023-03-16
Issue:1
Volume:4
Page:77-106
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ISSN:2624-795X
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Container-title:GeoHazards
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language:en
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Short-container-title:GeoHazards
Author:
Krassakis Pavlos12ORCID, Karavias Andreas2, Nomikou Paraskevi3ORCID, Karantzalos Konstantinos4ORCID, Koukouzas Nikolaos2, Athinelis Ioannis1, Kazana Stavroula3, Parcharidis Issaak1
Affiliation:
1. Department of Geography, Harokopio University of Athens, El. Venizelou 70, 17671 Athens, Greece 2. Centre for Research & Technology Hellas (CERTH), 15125 Athens, Greece 3. Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimioupoli Zografou, 15784 Athens, Greece 4. Department of Topography, School of Rural and Surveying Engineering, National Technical University of Athens, Zografou Campus, 9 Heroon Polytechniou Str., 15780 Athens, Greece
Abstract
Coastal environments are highly recognized for their spectacular morphological features and economic activities, such as agriculture, maritime traffic, fishing, and tourism. In the context of climate change and the evolution of physical processes, the occurrence of intense natural phenomena adjacent to populated coastal areas may result in natural hazards, causing human and/or structural losses. As an outcome, scientific interest in researching and assessing multi-hazard susceptibility techniques has increased rapidly in an effort to better understand spatial patterns that are threatening coastal exposed elements, with or without temporal coincidence. The islands of Milos and Thira (Santorini Island) in Greece are prone to natural hazards due to their unique volcano-tectonic setting, the high number of tourist visits annually, and the unplanned expansion of urban fabric within the boundaries of the low-lying coastal zone. The main goal of this research is to analyze the onshore coastal terrain’s susceptibility to natural hazards, identifying regions that are vulnerable to soil erosion, torrential flooding, landslides and tsunamis. Therefore, the objective of this work is the development of a multi-hazard approach to the South Aegean Volcanic Arc (SAVA) islands, integrating them into a superimposed susceptibility map utilizing Multi-Criteria Decision-Making (MCDM) analysis. The illustrated geospatial workflow introduces a promising multi-hazard tool that can be implemented in low-lying coastal regions globally, regardless of their morphometric and manmade characteristics. Consequently, findings indicated that more than 30% of built-up areas, 20% of the transportation network, and 50% of seaports are within the high and very high susceptible zones, in terms of the Extended Low Elevation Coastal Zone (ELECZ). Coastal managers and decision-makers must develop a strategic plan in order to minimize potential economic and natural losses, private property damage, and tourism infrastructure degradation from potential inundation and erosion occurrences, which are likely to increase in the foreseeable future.
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