MORPHOSTRUCTURE PECULIARITIES OF ODESSA COAST ABRASIVE-LANDSLIDE BENCH OF THE BLACK SEA
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2017, Vol 22, Issue 2
Abstract
Problem Statement and Purpose. The literature on the landslides of Odessa Black Sea coast is quite numerous. Together with that, there are few publications dedicated to studies of the underwater slope of the landslide coast from the viewpoint of engineers-geologists. Interest of geology engineers to the underwater part of landslide slopes is caused by both the need in geological assessment of conditions for different facilities building and the necessity of revealing the regularities of landslide slopes development for a long time. The aim of the work is detection of morphostructure peculiarities of underwater slope relief on the segment of landslide Black Sea coast in the area of hydrobiological station of Odessa I. I. Mechnikov National University (ONU). Data & Methods. To study peculiarities of the relief of underwater coastal slope the results of 3 bathymetries were used: of 2016 (performed by the ONU in the framework of EMBLAS II Project); of 2009 (club Navareks, Odessa); of 2006 (production-commercial firm «Proektgidrostroy», Odessa). Besides, the results of underwater remote filming carried out in 2008 (Klaipeda University, Lithuania , together with the ONU) were used. The most detailed bathymetry was performed during the survey of 2016 along 13 depth profiles down to the depth of 16 m at the plot stretching along the coast for 1200 m. To measure the depth echo-sounder «SeaCharter 640 cDF» comprising GPS block to set coordinates was used. Conversion of the data from the echo-sounder format for the further processing in MS Excel was done using software SonarViewer 1.2.0.2. Digital model of underwater relief was built using modern GIS-software ArcGIS Desktop and Surfer package. Statistical processing of the data was done using Statistica software. Results. Relicts of old land-slides were found in the coastal part of Odessa coastal shelf down to the depth of 10-12 m. Morphometric analysis of the relief of underwater slope using materials of the bathymetric surveys and instrumental observations of deformation processes in the above-water portion enabled us to reveal stability of linear dimensions of landslide blocks and strike azimuths of old and modern landslides shifting. Geohistorical reconstructions performed enabled us to receive not only quality characteristics of geological processes, but also averaged quantitative estimation of their intensity for the periods of time exceeding significantly the periods of field studies. Building of new facilities of different purpose in the coastal zone area and anti-landslide construction, as well as development of new and reconstruction of existing coast-protection works shall be done taking into consideration the relicts of landslides found on the underwater slope.
Authors and Affiliations
T. V. Kozlova, Ye. A. Cherkez, M. H. Botnar, Ye. I. Gazyetov, S. M. Snigirov
Keywords
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