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Dr.-Ing. Ernst Trapp Award 2014

Award to honour students of civil engineering because of an excellent master/diploma thesis and successful and efficient studies as well as because of the interest of students and university specific issues. The award, worth 5000 Euros, has been delivered by Dr. Ernst Trapp (a TU Berlin alumni) during the diploma ceremony of civil engineering students. The first and second awardee received 1500 Euros, the third and fourth awardee received 1000 Euros. 

Awardee

Lupe

M.Sc. Tabea Broecker

Advisors

The master thesis "Simulation of two-dimensional flow and transport processes in a Brazilian reservoir" was carried out at the Chair of Water Resources Management and Modeling of Hydrosystems, Department Civil Engineering, School VI Planning, Building, Environment, Technische Universität Berlin.

Mrs. Broecker was supervised by Dipl.-Ing. I. Özgen and M.Sc. Mahgoub and examined by Prof. Dr.-Ing. R. Hinkelmann. The master thesis received the mark 1,0. 

Sponsor / offered by

The award is offered by Dr.-Ing. Ernst Trapp.

Jury

The Jury consists of Mr. Dr. Trapp as well as three professors from the Department of Civil Engineering.

Abstract

This thesis presents various simulations of flow and transport processes for a reservoir in northeast Brazil under changing conditions. The simulations were executed with the TELEMAC-2D model, solving the depth-averaged two-dimensional shallow water and transport equations with a finite element method. Statistical analyses of daily measured discharge data for the years 1989 to 2010 were carried out. Mean flow conditions as well as droughts and flood cases with statistical recurrences of one and of ten years were simulated and evaluated. A time step variation was carried out under mean flow conditions. For the evaluations the focus was set on the water elevations and the flow velocities at ten control points in the main stream and four control points in the bays. It was observed that the stream in the main river dominates, whereas the flow velocities in the bays are almost stagnant. The influence of the friction on the flow was analyzed in parameter studies. For this purpose, flood events were investigated with bottom roughness coefficients between 10 m1/3/s and 75 m1/3/s. The simulations revealed the enormous influence of this parameter on the flow velocities and water elevations. The hydraulic numerical flood simulations were compared with the hydrological Muskingum model. The observed models showed a good agreement. The spreading of a contaminant was analyzed by injecting a tracer in different areas under mean flow conditions and for a flood event with a statistical recurrence of ten years at the inflow boundary. For this purpose, breakthrough curves for various profiles were observed. Moreover the impact of the diffusion was examined. Under mean flow conditions a tracer with diffusion coefficients between 0 m²/s and 0.1 m²/s was injected. The simulations showed that this coefficient has a significant influence on the affected area. Finally the water body that is effective for transport of the reservoir was determined. The examination indicated that 12.3% of the whole computational domain but only 5% of the water volume were not effective for the transport. The thesis demonstrates the significance of the applied parameters like the bottom roughness and diffusion coefficients for the simulations. In the future, these data should be determined in order to check the results and if necessary adjust the present model. Also three-dimensional simulations are planned for the Ico Mandantes Bay to investigate for instance density induced flow. 

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