Damir Bekić

A morphodynamic stability analysis of gravel beach cross-section by 1D numerical model

U radu je opisna analiza stabilnosti sljuncanih plaža i razvoj njihovog profila u poprecnom smjeru pri djelovanju gravitacijskih vjetrovnih valova. Analiza je provedena tehnikom numerickog modeliranja. Modelski pristup primijenjen je i u analizi valnih deformacija i morfodinamike na primjeru sljuncane plaže Medveja. Rezultantni modelski profili plaže koreliraju s izmjerenim poprecnim profilima plaže Medveja, pa se metodologija i dobivena procjena erozije materijala plaže mogu prakticno primijeniti pri donosenju odluka u raznim fazama projektiranja.

Simulation of Levee Breach Using Delft Models: A Case Study of the Drava River Flood Event

This paper focuses on the modelling of a real-world flood event and levee breach by using Delft3D model and a newly developed Delft-Flexible Mesh (Delft3D-FM) model coupled with feedback control module. The study area is located at the bordering section of the River Drava between Slovenia and Croatia around the Hydro Power Plant Formin. The major flood event on the River Drava in November 2012 caused significant damages in Slovenia and Croatia. During flood event, the levee breaches occurred at several locations around the Formin HPP. Two different numerical models were developed to simulate propagation of the November 2012 flood event in order to replicate the corresponding water levels and discharges on the complex river system with the HPP Formin. The Delft3D and Delft3D-FM models were developed to simulate the flood and levee breach as well as to evaluate the modelling approach by comparing curvilinear and unstructured numerical solvers. Delft3D-FM was also coupled with the feedback control module. The numerical model results were compared to the measured water levels and discharges. The results of Delft3D and Delft3D-FM models were intercompared as well. The levees in the Delft3D-FM model were parameterised as line elements with defined sill level of the levee and the resistance valid for large-scale model when grid size is relatively larger than width of the levee. Feedback control module was used to replicate the levee breach as lowering of the sill at the location of breaches. In Delft3D, levees were modelled as a part of bathymetry which was not changed at the time of breach. It was simply modelled by using discharge extraction–insertion functionality. Delft3D-FM successfully confirmed the time of levee breaches. The utilisation of a feedback control tool in Delft3D-FM allowed the simulation of levee breaches in a more realistic way than in the Delft3D model. Besides, our explorative study shows that the Delft3D-FM computations were up to 4 times slower than Delft3D for the same number of computational points. However, the unstructured grid (flexible mesh) model allows for a substantial reduction of computational points on complex geometries like current model domain. This resulted in 2.5 times faster computational time for Delft3D-FM model when compared to Delft3D simulation time for the river Drava study while preserving the same accuracy as well as with improved physics of the flood, time of the rise of the flood wave and levee breach simulation.

Hydraulic-Hydrology Analysis of the Turbulent Seepage Flow within Karst Aquifer of the Golubinka Spring Catchment

This paper shows the results of the hydraulic-hydrologic calculations of karst spring discharges and the groundwater level in the aquifer of spring c

BRIDGE SMS: Intelligent bridge maintenance and management system

An intelligent system for bridge inspection and management requires a knowledge and appreciation of structural engineering, geotechnics, hydraulics, hydrology, materials and transport management. This study introduces BRIDGE SMS, an EU/FP7 project, which couples state-of-the art scientific knowledge in hydrology, river and structural engineering with industrial knowledge in infrastructure management and web-based bridge management. This involves the application of monitoring systems for the assessment and management of the structural and hydraulic vulnerability of infrastructure assets over waterways in an effort to develop an open-source cloud-based intelligent Decision Support System. BRIDGE SMS aims to deliver procedures for complete bridge inspections, through scour and structural inspections, and to develop a reliable decision support tool which would efficiently manage bridge failure risks in a cost-effective way.

Analiza morfodinamičke stabilnosti poprečnog profila šljunčane plaže

U radu je opisna analiza stabilnosti sljuncanih plaža i razvoj njihovog profila u poprecnom smjeru pri djelovanju gravitacijskih vjetrovnih valova. Analiza je provedena tehnikom numerickog modeliranja. Modelski pristup primijenjen je i u analizi valnih deformacija i morfodinamike na primjeru sljuncane plaže Medveja. Rezultantni modelski profili plaže koreliraju s izmjerenim poprecnim profilima plaže Medveja, pa se metodologija i dobivena procjena erozije materijala plaže mogu prakticno primijeniti pri donosenju odluka u raznim fazama projektiranja.

Analysis of vertical pressure load exerted on horizontal RC plates by wave impact

The analysis of dynamic pressure load exerted on the caisson structure bottom cover plate subjected to wave action is presented and illustrated by the example of Zagreb Pier in the Port of Rijeka. In addition to physical model measurements, empirical models are applied using input data from the linear wave theory and numerical model. The reliability of the applied methodology is assessed through comparison of measured and modelled values. The best correspondence between the measured and modelled results is obtained using the linear wave theory and the Kaplans (1995) empirical model.