Wstępne wyniki badań i prognozy dotyczące przebiegu niszczenia brzegów zbiornika w Dobczycach

Abstract

The paper presents classification of coastal zone of the Dobczyce reservoir according to geological structure (lithology and tectonics) and dynamics of contemporary processes which take place in the coastal zone. Abrasional coasts are highly differentiated as to diversity of forms and dynamics of present processes. Four prognostic types of coast have been distinguished: step-like forms of abrasion, fall out-abrasional, landslide-abrasional and creeping-abrasional. The speed of silting depends also on coast abrasion. Annual size of abrasion is differentiated and it will decrease with the reservoir exploitation. Estimated share of abrasional material in silting should not be greater than 25% of material deposited in the reservoir. The dam at Dobczyce influenced also structure and texture of transported material down the dam. Balance of reservoir silting will be able to be presented when the researches are completed and when models of relief of slopes development in the coastal zone will be presented. It can be stated that there is a clear dependance of character of deposits in subacqual part of the coast on character of its on-water deposits after 5 years of the reservoir existence.