ПЕРЕРАБОТКА УЧАСТКА БЕРЕГА ИРКУТСКОГО ВОДОХРАНИЛИЩА, СЛОЖЕННОГО ЛЁССОВИДНЫМИ ПОРОДАМИ

The paper deals with the mechanisms of abrasion destruction on a near-dam shore strip of the Irkutsk Reservoir within the urban territory. The survey of five profiles showed that the retreat of the shore at the case site constituted 1–3 m for the 2004-2006 period. The investigation revealed the main stages of the process development to be closely related to the water level fluctuations in the reservoir. At the low water level the slope of the shore is flattening and its profile become stable and equilibrium. At the high level the shore is washing out and its profile become unstable. Loams and sandy loams present in the section, marked by low firmness and small strength, cause the development of plastic deformations at significant moistening. The water level fluctuations in the reservoir lead to cyclical nature of shore degradation; physical, physical-chemical, and stress-strain properties of soils affect its rate.