Akademik Veri Yönetim Sistemi
21st Physics of Estuaries and Coastal Seas Conference, Bordeaux, Fransa, 23 - 27 Eylül 2024, ss.20
This study provides a comprehensive numerical study of the effects of waves, and wave-current interaction
on the river plume hydrodynamics and sediment dispersal along the western coast of the Black Sea, with a focus on the Danube Delta area. The modeling study has been carried out using a novel model chain, from catchment to sea covering the Western Black Sea. It comprises a 3D finite element model of the coastal area including the last portions of the rivers and coastal bodies, is forced laterally with outputs of a catchment model developed by Deltares on 11 river catchments around the Black Sea, and forced at the open sea boundaries by a 3D Black Sea model implemented by METU (Sadighrad et al., 2021). In the coastal domain the coupled SHYFEM-WWIII models, with the Sedtrans05 module (embedded in SHYFEM) activated (Umgiesser et al., 2014). The model was applied in the past in the Black Sea area (Bajo et al., 2014, Dinu et al., 2011). It has been successfully applied to study 3D baroclinic cross-scale lake-river-estuary-plume-shelf-ocean circulation (Umgiesser et al., 2004, Umgiesser et al. 2014). The model chains is suited for investigating the land-sea interaction and the effects of water and sediment loads from rivers in the coastal area, since the catchment model provides water and sediment loads and the coastal model reproduces 3D circulation, wave-current interaction and suspended sediment transport.
An unstructured grid was produced (24694 nodes, 43864 elements) covering the Western Black Sea from the Turkish coast North of the Bosphorus Strait up to Crimea. The grid includes four river inputs (Figure 1).
The boundary forcings include the river forcings (discharges), sediment loads, and temperature from the rivers computed by the catchment model developed by Deltares, together with the open sea boundary conditions from NEMO (METU run).
The study describes the plumes dynamics, the variability of salinity and SSC patterns along the year, inferring on the effect of the main drivers (wind, river water and solid discharge, waves) evaluating specific events and the relative effect of circulation and waves, as well as the river discharge and sediment load in modulating the ROFI (Region of Freshwater Influence) and the turbid plumes. The model chain, thanks to the improved outputs from the catchment model and the open sea boundary conditions provides good results and evidence the importance not only of a good representation of the domain, but the central role of lateral forcingins, as well as a full set of information on the liquid and solid loads from rivers, to reproduce the coastal dynamics of the Western Black Sea. This model chain is a first step which can be further improved either for specific process study implementations of for broader operational uses to support coastal management.