Thesis supervisor: Tamás Krámer
Location of studies (in Hungarian): BME Department of Hydraulic and Water Resources Engineering Abbreviation of location of studies: BMEVV
Description of the research topic:
Lake surface fluctuations have a strong influence on shallow littoral ecosystems, shoreline morphology and gravity-driven water exchange of enclosed basins and reed canal networks. Moreover, extremes cause shoreline erosion and flooding. Randomness and high spatial variability characterise these surface motions. They cover a broad frequency range, including variations of the hydrological regime and the dynamic impact of wind, i.e. basin-wide surges, seiches and much shorter periodic waves. The high spatial variability means that water level statistics derived from historical gauge time series have a restricted footprint, which calls for long-term simulation of the physical system and to derive statistics from spatially distributed numerical results. It is, however, a challenging goal to construct and calibrate a catchment–wind–lake–wave–runup model system that can perform this efficiently.
This research topic targets medium-sized lakes where tides and internal waves are unimportant, and wave growth is restricted by depth and fetch. For this reason studies made in deeper lakes (Laurentian Great Lakes in North America or Swiss lakes, see the recommended literature) are useful but cannot be applied without adaptation to shallow lakes such as Lake Balaton or Lake Fertő in Hungary. One difficulty is that shallowness strengthens nonlinearity and it is questionable whether the individual fluctuation components can be estimated with suitable, separate models and then superimposed (e.g. shown by Schwab 1978 for Lake Erie). This requires clever algorithmic organisation and simplifications of the physical model, or even the replacement of some components with data-driven procedures.
The principal goal of this research topic is to develop a method to determine the probability distribution of the dynamic water surface elevations and wind waves along the shoreline of shallow, medium-sized lakes, and demonstrate its applicability in a real case study. The method should be validated for not only the peak values but also for means and minima, to benefit ecological studies, flood hazard evaluations and shore protection design. Processes to address include lake management scenarios, spatial and temporal variability of wind, wave transformation in the swash zone, dissipation in the littoral reed, wave runup on protected shores.
Number of students who can be accepted: 1
Deadline for application: 2023-05-31
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
Login
