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Landslides Triggered in the City of Zagreb in the Winter of 2013


Bernat, Sanja; Mihalić Arbanas, Snježana; Krkač, Martin
Landslides Triggered in the City of Zagreb in the Winter of 2013 // Book of abstracts/4th workshop of the Japanese -Croatian project on Risk Identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods in Croatia / Vlastelica, Goran ; Andrić, Ivo ; Salvezani, Daša (ur.).
Split: University of Split, Faculty of Civil Engineering, Architecture and Geodesy, 2013. str. 65-66 (predavanje, nije recenziran, sažetak, ostalo)


Naslov
Landslides Triggered in the City of Zagreb in the Winter of 2013

Autori
Bernat, Sanja ; Mihalić Arbanas, Snježana ; Krkač, Martin

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

Izvornik
Book of abstracts/4th workshop of the Japanese -Croatian project on Risk Identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods in Croatia / Vlastelica, Goran ; Andrić, Ivo ; Salvezani, Daša - Split : University of Split, Faculty of Civil Engineering, Architecture and Geodesy, 2013, 65-66

Skup
4th workshop of the Japanese -Croatian project on Risk Identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods in Croatia

Mjesto i datum
Split, Hrvatska, 12-14.12.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
City of Zagreb; landslides; rainfall

Sažetak
The winter period of 2013 in the City of Zagreb, capital of the Republic of Croatia, had extreme weather conditions that caused (re)activation of 65 landslides in the pilot area of WG3 of the Croatian-Japanese SATREPS FY2008 project. In the same period in the continental part of Croatia, Croatian National Protection and Rescue Directorate (DUZS) recorded more than 900 activated landslides (Bernat et al., in press). The highest number of reported landslide events is in the NW Croatian counties. The pilot area of WG3 encompasses the hilly area of the southern foothills of the Medvednica Mt. in the City of Zagreb, which covers an area of 180 km2 (Mihalić and Arbanas, 2013). The elevations in this area range from 115 to 612 meters above sea level, and the prevailing slope angles (62%) range from 5° to 20°. The pilot area is located in the area composed of Late Miocene and Quaternary sediments. Landslides are a dominant geomorphological process in all the Medvednica Mt. stream catchments. Moreover, landslides are the main geological hazard of the studied hilly areas where approximately 32%of the urban area is located (Mihalić Arbanas et al. 2012) The subject of this paper is the extreme weather conditions in the winter of 2013, i.e., long-lasting heavy rainfall and a thick snow cover, which triggered more than 60 landslides in the City of Zagreb. Landslides caused significant damages to private houses, infrastructure and crops. Measurements obtained by six weather stations located in the hilly area of Zagreb City were used to analyze precipitation conditions that triggered numerous landslide events. Preliminary analysis of data from one meteorological station located in the City of Zagreb, i.e. Zagreb-Grič Station shows that from the 1st January to the 7th April, the City of Zagreb experienced a period of intense rainfall and snow with cumulative values over the 97-day period exceeding 400 mm. Cumulative precipitations for the selected period exceeded 46% of the mean annual precipitation (MAP). The results of preliminary analysis of the relationship between landslide occurrence and climate conditions, shows the following extremes: cumulative monthly precipitation in January, February and March in 2013 was two to three times higher than the average monthly values for the period from 1862 to 2012 ; and cumulative precipitation for a 3- month period in 2013 has the highest value in the last 150 years (Bernat et al., in preparation). Rough data about landslide events are received from records of the City Office of Emergency Management (OEM). Information regarding the (re)activation of landslides in the winter period of 2013 was received from citizens who informed City administration responsible for landslide remediation or civil protection throughout that time period. City representatives performed more than one hundred field examinations to estimate whether or not structures and/or people were at risk and to organize urgent mitigation measures. Evidence of examined landslides is recorded in the City offices in the form of lists with the data regarding landslide locations and the date of activation. On the basis of information collected from City administration, landslide inventory map with more than 60 landslides is made. Simple GIS database with reliable landslide records about location, date of initiation and landslide area will be developed on the basis of field examinations by professional engineering geologists. Results of the analysis of the relationship between landslide occurrence and climate conditions will have scientific as well as practical application for the prediction of landslides in extreme climate change scenarios. In Croatia there are no established national or regional landslide inventories, which can gather records about landslides caused by particular triggering event. Establishment of the system of centralized data archiving was initiated in April 2013 by scientists from University of Zagreb and University of Rijeka. National Protection and Rescue Directorate of the Republic of Croatia will be leading authority in organizing data collection from the whole country.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo



POVEZANOST RADA


Ustanove
Rudarsko-geološko-naftni fakultet, Zagreb