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DECIPHERING THE MORPHOLOGY OF THE CHANNEL AND RELASHIONSHIP WITH ANTHROPIC CHANGES IN THE DANUBE DELTA BASED ON MULTIBEAM BATHYMETRIC INVESTIGATIONS

Florin FLORIN

Abstract

Since the 1980s, intensive anthropogenic disturbances have affected the channel of the St. George branch that is the southern distributary of the Danube River. The meander cutoff programme since 1984?1992 induced different hydro-morpho-sedimentary impacts on the local distribution of river flow velocities, discharge, and sediment fluxes between the former meanders and the man-made canals [1]. These cut-offs lead to a shortening of the distributary by about 31 km and, consequently, increased the free water surface slope and waterflow velocity. The shortening and deepening of the river channel radically changed the hydrological regime of the Delta. As a result, the St. George distributary water and sediment discharges have also slowly increased [2]. The effects of the anthropic works are observed in the morphology of the channel and associated bedforms. 3D bathymetry, flow velocity, bed sediment, suspended-load concentration, liquid and solid discharge data were acquired throughout several cross sections in order to investigate the role of the water and sediment regime in the morphology of the river bed. Two field campaigns (in September 2016 at medium water level and June 2017 on high waters) were made regarding the geometry, sediment composition and hydraulic conditions under which the bedforms grew and degenerated.

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DOI resolver: doi.org/10.5593/sgem2019/3.1/s12.016

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