Naslov
Landslide hazard assessment: data acquisition in Starca Basin (Croatia)

Autori
Vujnović, Tatjana ; Mihalić, Snježana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
32nd International Geological Congress ; Abstracts. Part 2 / - Firenza : München, 2004, 80-80

Skup
International Geological Congress (32 ; 2004)

Mjesto i datum
Firenca, Italija, 20.08.2004. - 28.08.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
landslide hazard; landslide mapping; geological-morphological factors

Sažetak
In this paper the results of data acquisition for landslide hazard zonation of Starca Basin (12 km2) in Croatia are presented. The investigation area is situated at the foothill of Mt. Samoborsko gorje, composed of Upper Miocene and Plio-Quaternary sediments. This research was experimental scientific aimed at developing methodology for landslide hazard assessment in neighbouring areas with similar geological-geomorphological settings. The main objective of the first phase of investigation was to collect input data for multivariate statistical analysis of spatial distribution of slope movement - sliding in the scale 1:5.000. Estimation of relative contribution of landslide causal factors using multivariate statistical techniques and development of hazard model are planned for the further phases of investigation. This paper deals with issues related to achieving adequate raw data about landslides and landslide causal factors in terms of accuracy, consistency and updating. Therefore, the techniques for collecting data are more subjected to data certainty than to cost-effectiveness. Landslides, rock/soil units and hydrogeological conditions were mapped on the topographic 1:5.000 base map by systematic field surveys. Collection of landslide data by conventional aerial photo interpretation failed, due to invisibility of landslide scarps on aerial images. Field identification of landslides encompassed recording of landslide features, activity and ‘ parent-child’ relationship, all assumed to be valuable attributes for further analyses. Similarly, field identification and mapping of relevant rock/soil units in 1:5.000 scale enabled detailed subdivision of lithological units based on physical-mechanical homogeneity. Land-use map was created by interpretation of orthophoto aerial images. However, morphological factors, such as slope geometry and basin or sub-basin characteristics were acquired in the most efficient and innovative way from high-fidelity DTMs. The relative contribution of landslide factors is evaluated by univariate statistical techniques. The results of this analyses are used as a tool for: confirmation of presuposes about influence of particular factor class to landsliding, and checking of resolution and confidence of input data. At the end, homogenity criteria of factor map classes are discussed, focused on their applicability to mapping in wider areas with similar geologic-geomorphological conditions, anthropogenic activities and vegetation cover.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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