Abstract
The assessment and mitigation of landslide risk affecting hillslopes in highly urbanized and infrastructured environments are often problematic due to the inadequacy of the traditional approach based on landslide inventories and the absence of a shared language between the different scientific-technical operators (geologists, engineers, architects, environmentalists, economists, jurists) and recurrent understanding problems with policymakers, stakeholders, and property owners. Therefore, innovative technologies and working procedures are required to address these problems. In this context, the European INSPIRE Directive and the Italian national Catalog of Territorial Data with the related Geo-Topographic DB provide positive responses in terms of data standardization and transdisciplinary interoperability. On the other hand, the application of the object-oriented geomorphological mapping of landslides and, even more, the recently proposed Landslide Object-Oriented Model (LOOM) make it possible to develop a more thorough approach to assess the spatial and temporal relationships between landslides and affected slopes. Following the above perspective, the InterUniversity Research Center for Prevision and Prevention of Great Risks (C.U.G.RI.) produced the LOOM-based “eventory” of landslides over a sector of the Tyrrhenian coastal belt, northwest of Salerno city, in the framework of a multi-disciplinary investigation project launched by the Campania Regional Administration to assess the landslide risk. The quantitative assessment of the geomorphological expert-judgment procedures has been carried out exploiting morphometric indexes: the Topographic Position Index (TPI) for automatic slope features recognition, and the Slope-Area plots for surficial process domains. Furthermore, the application of the INSPIRE, and related Italian National Geo-Topographic DB standards allowed transdisciplinary interaction between scientists, technicians, and managers. Such proposal can support the risk management procedure, adding in the Value Judgement and Risk Tolerance Criteria simplicity and effective interoperability in trans-disciplinary frameworks.
Highlights
The quantitative assessment of landslide risk focuses on the liabilities and responsibilities of the involved parties, providing a reliable framework to put the uncertainties of engineering-geomorphological expert judgments into a more robust decisional system
The first in-depth study area comprises the North-Southoriented sector of the Olivieri catchment, immediately north of the Salerno harbour. This area is widely affected by flow-like movements, such as debris flowslides and debris flows, which fall within the granular soil wet flow class in the Landslide Object-Oriented Model (LOOM) data structure
From comparing LOOM data and the resulting surficial processes grid, we demonstrated a good visual correlation, and a preliminary quantitative correlation between debris avalanches, debris flows and the IIIa region of the slope-area plot
Summary
Since the early 1980s, quantitative methods and procedures have been increasingly applied to assessing landslide risk of single slopes within broad areas in the perspective of land planning and management (Varnes and IAEG, 1984; Whitman, 1984; Einstein, 1988; Fell, 1994; Cruden and Fell, 1997; Australian Geomechanics Society, 2000; Hartford and Baecher, 2004; Lee and Jones, 2004; Fell et al, 2005; Hungr et al, 2005; Canuti and Sassa, 2008; Corominas et al, 2014). A reliable quantitative approach to landslide risk assessment requires appropriate working procedures and technologies that may allow easier interaction among different disciplines and interoperability between different geographic information systems In this perspective, the object-oriented inventory mapping of landslides, represented as spatial entities (objects) with a precise identity and persistence character A noteworthy contribution to the interaction among different scientific, technical, and managing partners in European countries is provided by the INSPIRE (Infrastructure for Spatial Information in Europe) Directive It concerns dictionaries and related hierarchical and multiscalar data coding (Craglia and Annoni, 2007; Masser, 2007), on which the Italian Catalog of Territorial Data Specifications for GeoTopographic Databases are based. For the basic Geomorphologic Features, Landform is defined as: “An abstract spatial object type describing the shape and nature of the Earth’s land surface”
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