EVOLUTION OF DEBRIS FLOW BASINS ON THE SLOPES OF MARINE TERRACES OF THE COAST OF MAGADAN OBLAST AND SAKHALIN ISLAND
S.V. RYBAL’CHENKO1, K.V. VERKHOVOV2
1Special Research Bureau for Automation of Marine Research, Far Eastern Branch, Russian Academy of Sciences, 693000, Yuzhno-Sakhalinsk, ul. Gor’kogo, 25, Russia
rybalchenko_sv@mail.ru
2RAI STC Gornyi Vozdukh, Yuzhno-Sakhalinsk, ul. Gornyi vozdukh, liter V, Russia
konstantin_verhovov@mail.ru
Keywords: склоновый селевой бассейн, долинный селевой бассейн, селеопасный период, селевой режим, экзогенные процессы, эрозионный врез, селевые отложения, селевое русло, slope debris flow basin, valley debris flow basin, debris flow hazard period, regime of debris flow, exogenous processes, erosional incision, debris flow deposits, debris flow channel
Abstract
Formation of debris flows and occurrence of debris flow basins on marine terraces, and also their further evolution is still a poorly explored area of debris flow research. To create the engineering protection, spatial planning and laying-out of line structures with due regard for the dynamics of development of debris flow basins on the sea coast requires an integrated approach to the study and prediction of the evolution of such landforms. Field material and archival data were used as a basis to determine landforms on the slopes of marine terraces of the coast of Magadan oblast and Sakhalin Island which are debris flow basins. We processed a large array of engineering-geological and meteorological data, and morphometric and morphological characteristics of the debris flow basins. On the basis of the characteristics of the geomorphological structure of the debris flow channel, we identified four evolutionary stages of the debris flow basins on the marine terraces as well as determining a number of attributes and quality characteristics of the debris flow basins, allowing us to accurately identify a particular stage of their evolution. Furthermore, we examined the conditions for emergence and evolution of debris flow basins and determined the main factors that are responsible for the transition of the debris flow basins on the slopes of the marine terraces from stage to stage. Knowledge of the occurrence and evolution patterns of debris flow basins is instrumental in undertaking a package of measures for the engineering protection of territories and for a minimization of the negative impact at different evolutionary various stages of debris flow basins.
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