Geoekologiya, 2018, Vol. 4, P. 53-61


S. V. Rybal’chenkoa,# and K. V. Verkhovova,##

aFar East Geological Institute, Far East Branch, Russian Academy of Science, Sakhalin Department, Yuzhno-Sakhalinsk, Russia
bMPI Capital construction management, Yuzhno-Sakhalinsk, Russia
##E-mail: konstantin_verhovov@mail.ru

On Sakhalin, a significant portion of settlements and objects of transport infrastructure are located in the coastal zone and are often influenced by the slope geodynamic processes (landslides, debris flows, etc.), which are not taken into account in territorial planning and tracking. At first glance, the relatively resistant rocks are more susceptible to factors of denudation, and the motley composition of the sweet, forming the marine terraces, creates severe engineering geological conditions. The most dangerous geodynamic processes on the slopes of the marine terraces of the Sakhalin island are debris flows, because they are distinguished by suddenness, high speed, throw and a great destructive force, even with small amounts. Geological factors is one of the determinants in debris flow formation; and the lithological composition of the rocks affects the characteristics of debris flows, debris flow catchments, and debris flow process in general. This paper examines the influence of lithological composition on the forms of slope debris flow catchments, and the type of debris flow process. Lithological complexes of rocks are distinguished on the basis of stability of species to the factors of denudation. Thus, lithological complexes unite rocks composing a suite of similar genesis and physical properties regardless of their age. The mineralogical composition of the cement and grain-size composition of rocks exerts the greatest effect on the resistance of rocks to denudation factors. Each of the lithological complexes is represented by debris flow-forming rocks of specific composition, which controls the shape features and geomorphological structure of debris flow catchment, debris flow and the process in general. There is a direct correlation: lithologic complex - debris flow process – shape of the debris flow catchments. On the slopes of the marine terraces of Sakhalin it is possible to identify six types of slope debris flow catchments: a potential debris flow origination site, a gully, a landslide funnel, a linear, sinuous and diamond-shaped ravine. Shape of slope debris flow catchments may be complicated by additional elements of erosion landforms; however, form and formula of the main morphometric catchment allows us to determine the shape of the entire debris flow catchments, type of debris flow process and lithological complex.

Key words: denudation, lithological complex, debris flow, slope debris flow basin, debris flow process


1. Vinogradov, Yu. B., Vinogradova, T.A. Matematicheskoe modelirovanie v gidrologii. [Mathematical modeling in hydrology], Manual for Higher School Students, Moscow, Akademiya Publ., 2010, 304 p. (in Russian)

2. Geografiya ovrazhnoi erozii [The geography of gully erosion]. Zorina, E.F., Ed., Moscow, MGU Publ., 2006, 324 p. (in Russian)

3. Kazakov, N.A. Geologicheskie i landshaftnye kriterii otsenki lavinnoi i selevoi opasnosti pri stroitel’stve lineinykh sooruzhenii (na primere o. Sakhalin). [Geological and landscape criteria of the assessment of ava-lanche and mudflow hazard in the construction of li-near structures (by the example of Sakhalin island). Cand. Sci. Dissertation, Moscow, 2000, 216 p. (in Russian)

4. Polunin, G .V. D inamika i prognoz ekzogennykh protsess-ov. [Dynamics and prediction of exogenous processes]. Moscow, Nauka Publ., 1989. 232 p. (in Russian)

5. Polunin, G.V. Ekzogennye geodinamicheskie protsessy gumidnoi zony umerennogo klimata. [Exogenous geody-namic processes in humid temperate zone]. Moscow, Nauka Publ., 1983, 249 p. (in Russian)

6. Rybal’chenko, S.V., Verkhovov, K.V. Ponyatie “sklonovyi sel'” i klassifikatsiya sklonovykh selevykh basseinov. [The concept of slope debris flow and ranging of slope mudflow basins]. Prirodnye katastrofy: izuchenie, moni-toring, prognoz. VI Sakhalinskaya molodezhnaya nauchnaya shkola, 38 oktyabrya 2016 g. [Natural ca-tastrophes: study, monitoring, and forecast: Proc. VI Sakhalin youth scientific school.October 3–8, 2016]. Yuzhno-Sahalinsk, 2016, pp. 300–304. (in Russian)

7. Rybal’chenko, S .V. S elevye protsessy na sklonakh mor-skikh terras yuzhnogo Sakhalina. [Debris flow processes on slopes of the marine terraces of South Sakhalin]. Vestnik DVO RAN, 2013, no. 6, pp. 52–59. (in Russian)

8. Rybal’chenko, S .V. S elevaya opasnost' territorii nasely-onnykh punktov Sakhalinskoi oblasti i neobkhodimost' primeneniya skhem planirovochnykh ogranichenii k gen-planam naselyonnykh punktov. [Mudflow hazard in the territories of settlements of the Sakhalin region and the necessity to use the schemes of planning restrictions to general plans in settlements]. Georisk, no. 3, 2013. pp. 33–42. (in Russian)

9. Rybal’chenko, S.V., Verkhovov, K.V. Sklonovye selevye basseiny i ikh morfodinamicheskie osobennosti. [Slope debris flow basins and their morphodynamic features].Georisk. no. 4, 2017. pp. 58–63. (in Russian)