NEW APPROACHES TO MAPPING THE RELIEF OF THE BOTTOM SURFACE AND COAST OF THE WATER BASIN AS EXEMPLIFIED BY THE PESCHANYI SEGMENT OF SOUTH BAIKAL
A.V. KAZAKOV1,2, E.E. KONONOV2, O.M. KHLYSTOV1, A.R. BATUEV2
1Limnological Institute, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, ul. Ulan-Batorskaya, 3, Russia
kazakov.gis@gmail.com
2V.B. Sochava Institute of Geography, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, ul. Ulan-Batorskaya, 1, Russia
kononov@lin.irk.ru
Keywords: multibeam echosounders, bathymetry, technique, digital elevation model, geological processes
Abstract
We examine the technique of phased processing of bathymetric material obtained by means of high resolution multibeam echo sounding and Earth remote sensing data, based on using advanced GIS technologies, with the purpose of developing the digital elevation model that combines the bottom and coast of the Peschanyi (Sandy) segment of South Baikal. The suggested algorithm of developing the digital elevation model makes it possible to achieve an acceptable visualization quality of new bathymetric data in order to identify small topographic features not accessible previously because of low survey resolution of the bottom and subsequent data processing. It is shown how on the basis of analyzing the resulting digital model the morphological characteristics of the bottom surface of the Peschanyi segment are described. The analysis permitted us to assess the role of the endo- and exogenous factors in the creation of the most clearly pronounced forms of the bottom-slope relief. It was found that the subaquatic-gravitational processes produced widely occurring ridge-gully forms of the depth dump of the delta-fronts. Geomorphologically, the underwater slope of the western side of the segment is relatively uniform; it is dominated by abrasion, tectogenically-caused steeply inclined surfaces.
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