Naslov
Geological, geomorphological and engineering geological conditions of the Dubracina River Basin, Croatia

Autori
Toševski, Aleksandar ; Wang, Chunxiang ; Krkač, Martin

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Monitoring and analyses for disaster mitigation of landslides, debris flow and floods. Abstract proceedings of the 2nd Japanese-Croatian Project Workshop / Ožanić, Nevenka ; Arbanas, Željko ; Mihalić, Snježana ; Hideaki, Marui - Rijeka : Sveučilište u Rijeci, 2012, 118-121

ISBN
978-953-6953-30-1

Skup
2nd Japanese-Croatian Project Workshop 'Monitoring and analyses for disaster mitigation of landslides, debris flow and floods'

Mjesto i datum
Rijeka, Hrvatska, 15.12.2011. - 17.12.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Dubračina river basin; flysch; slope; 3d stability analysis

Sažetak
Dubračina River Basin is located in continental part of Primorsko-Goranska County in hinterland of the Crikvenica City. It is one of the pilot areas in Working Group 3 of Croatian-Japanese joint research project “Risk identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods in Croatia”. The basin covers an area of 43.5 km2 and stretches northwest-southeast which is parallel to the Adriatic coast. Current land-use at the area of the Basin is as follows: 38 km2 is forest and semi-natural areas, 3 km2 is agricultural land, 2 km2 is artificial surface. Altitude of this area ranges from 1 to 920 meters above sea level (62% of the basin has elevation in the range 1-300 m), and the prevailing slope dip angles (75%) are in range 0-25°. According to unpublished geological map in scale 1:25000 made by Croatian Geological Survey, on the surface of the basin can be found carbonate and clastic rocks. Carbonate rocks are represented by Upper Cretaceus and Paleogene limestones. Together they cover 55% of basin area, 2% of the area is covered with Paleogene transition sediments between carbonate and clastic rocks which are comprised of interlayered marls and limestones. Clastic rocks are represented by Eocene flysch sediments (siltstones, marls, sandstones and biocalcirudites) which are covering only 1% of the surface, Paleogene breccias and Quaternary sediments. Sediments of Quaternary age are covering 42% of the basin surface. They are built of talus breccias, talus unlithified or poorly lithified material (limestone blocks, cobbles, pebbles, and terra rossa), diluvium (sands) and alluvium deposits (gravels, sands, silts and clays). Numerous active and dormant landslides, together with erosion, form the dominant geomorphological processes that are the main geological hazard. Slip surfaces are occurring between quaternary superficial sediments and flysch bedrock due to big difference in permeability of these two types of sediments. Beside sliding, Slani potok (Salty creek) sub-basin is characterized by excessive erosion which is caused by thenardite (Na2SO4) crystallization where landscape has appearance of badlands. These geohazards cause significant economic losses by damaging roads, facilities, houses and watercourses. In this paper, the general data, including geomorphological and geological information and erosion conditions, are presented. The 3D stability analysis of a road slope in Salty creek sub-basin is performed using ADCALC3D. The 3D results are compared with the 2D stability analysis performed by Institute IGH d.d. (regional unit Rijeka) for the purpose of road reconstruction between Blaškovići and Grižane settlements.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA