RESEARCH ON THE SIMULATION OF THE ALLUVIAL TRANSPORT ON THE NUMERICAL MODEL AND THE ESTIMATION OF THE MORPHOLOGICAL MODIFICATIONS, WITH APPLICATION ON THE DANUBE RIVERBED FOR A PROPOSED SECTOR, IN THE PERIOD OF 2005-2010

Victor Dumitrescu, Adrian Barbieru, Alexandru Carsmariu

IPTANA S.A., Bucharest, Romania

Abstract

The elaborated researches regard the estimation of the Danube river bed morphological modifications, on an extended sector, situated upstream Bistreţ (km730) gauging station and downstream Bechet (km675) gauging station, with detailed application on a small sector (km 686+300-km 684+300) and punctual in a study section with sufficient data (km685+300). The main objectives on the proposed researches achievement is constituted by the fields selection (hydrological, hydrometrical, geological, topometrical, software, etc) of the complex database necessary for the hydraulic type mathematical modelling and of simulation of the river bed specific phenomena simulation through aggradation or degradation. The modelling of the Danube river bed geometry on the limitary area (km 686+300 – km 686+300) through transverse profiles executed with small equidistance (around 100 m) for the flowing section between dams (Romanian bank) and slope (Bulgarian bank) and also on an extended upstream sector (km 730) and upstream (km 675) with bigger equidistance. The establishing of the granulometric composition of the sediment discharges (for each rate of water flow - 1000 m3/s) and river bed for the potential eroded horizons taken from the geotechnical studies for the studied sector. The analysis of the chemical composition of the sediments from the river bed and the water chemistry of the Danube river with application on aggressiveness at metal and concrete (as auxiliary data). Hydrological data (daily average discharges, probability curves of the average and maximum water discharges) and the recent hydrometric activity at the above mentioned gauging station. The effective simulations on the model and the results elaboration were constituted on stages.

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