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SEDIMENT TRANSPORT MODELLING ON THE DANUBE SECTOR BETWEEN BECHET AND CORABIA (RKM 678 - RKM 625)
Abstract
On the Lower Danube, including the Romanian-Bulgarian common sector (between chainage km 845.5 to km 375), the width of the fairway is generally sufficient to accommodate multiple ships. However, in low water conditions (below 3000 mc/s) the depths are insufficient to ensure the efficient transport of goods. Very often, vessels sailing in the critical navigation areas (bottlenecks) can only be loaded at half of their capacity. This situation can cause significant losses for river transport operators and lead to lack of reliability of river transport. The Romanian-Bulgarian common sector of the Danube river contains twelve critical points distributed across five critical zones, which require careful monitoring through a series of topo-hydrographic measurements. Unfortunatelly, the effectiveness of the dredging works to maintain minimum navigation conditions has short-term effects, due to river dynamics and complexity of hydrological regime. For the improvement and extension of waterways, as well as for monitoring the dynamics of the Danube riverbed it was and is necessary to interconnect the topographic and bathymetric measurements in a unitary geodetic system, respecting current European and international standards: horizontal CRS, named ETRS89, and vertical CRS, named EVRS/implementation EVRF2007 [1]. In order to identify appropriate solutions to solve the navigability issues on the critical sectors of the Danube River, a sediment transport model is required to support the selection of technical solutions that must be implemented, such as excavated (dredged) channels, groynes, chevrons, longitudinal dikes or artificial islands. This paper aims to develop a complex hydrodinamic and sediment transport model of the Bechet-Corabia critical sector (between chainage km 678 to km 625), using Danish Hydraulic Institute (DHI) Mike 21 software. Data collected during two different topo-bathymetric and sediment measurement campaign have been used to fully calibrate and validate the 2D model.
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References6
Rus, T., Moldoveanu, C., Danciu, V., Kaltchev, I., Geodesy contribution to the Danube Water Project. DOI: 10.5593/SGEM2013/BB2.V2/S09.027, 2013;
DHI, MIKE 21 ST. Non-Cohesive Sediment Transport Module User Guide, pp. 7, 2017 (https://manuals.mikepoweredbydhi.help/2017/Coast_and_Sea/m21st.pdf);
Rheinheimer, D., Yarnell, S., Tools for Sediment Management in Rivers, DOI: 10.1016/B978-0-12-803907-6.00012-7, 2017;
Babiński, Z., The relationship between suspended and bed load transport in river channels. W: Sediment Budgets 1. IAHS Publ., 2005;
https://personal.ems.psu.edu/~jte2/geosc20/lect15.html (College of Earth and Mineral Sciences personal pages, last accessed on 31.10.2020)
Bogen, J., Tharan, F. & Walling, D. E., Erosion and sediment transport measurement in rivers: Technological and methodological advances. Wallingford, UK: IAHS Publication 283, 2003.
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