ASSESSMENT OF SUFFOSION HAZARD ON THE TERRITORY OF TOMSK

Abstract

Relevance of the research. Currently, the city of Tomsk is increasing the area of development; new neighborhoods appear on previously undeveloped land (for example, on the left bank of the river Tom). There is a redevelopment and reconstruction of the central part of the city. It is impossible to develop the territory in a high-quality way without taking into account the dynamics, mechanisms, factors and patterns of development of dangerous natural and technological processes, the forecast of their development. Despite the fact that the manifestations of suffosion are almost ubiquitous, this process remains one of the least studied processes. The main aim of the research is to assess the suffosion stability of soils within the city of Tomsk. Methods. We performed the analysis of spatial patterns that determine the development of suffosion using thematic maps prepared in ArcGIS at the first stage of our research. We chose five factors: the slope of the surface, the elevation, the geological structure of the territory, the types of filtration sections, and the distance to the river. The article describes the location of suffosion manifestations on these maps. At the second stage, we performed the suffosion hazard assessment of 26 varieties of sandy and coarse-grained soils according to the VNIIG methods. We described the particle size distribution and determined the uniformity coefficient, maximum size of the particles prone to suffosion, and the degree of soil suffosion of seven stratigraphic-genetic systems, common in the city. Results. We recommended using the obtained data on the degree of suffosion of sandy and coarse-grained soils in the design of engineering structures, in monitoring and operational management of the state of the geological environment, when assessing the value of urban land, in educational work when teaching the discipline «Engineering Geodynamics».

Keywords

• suffosion
• danger
• particle size distribution
• sand
• coarse-grained soils
• uniformity coefficient