1D hydrodynamic modelling on River Tisza: challenges, results, difficulties
Abstract
The Hungarian Hydrological Forecasting Service (HHFS) operating within the framework of the National Water Directorate General has been operating a tailor-made 1 dimensional hydrodynamic model on River Danube since January 2020, while developing the model onto River Tisza, which was completed by the beginning of 2023 as well. The main objective of the development is to support and substitute the already running discrete linear cascade models (DLCM). The model contains the Tisza between Tiszabecs and Novi Bečej and all the Hungarian reaches of the tributaries. Data collection and model building are still in process on the foreign river reaches. The Tisza catchment has a complex hydrology often causing multiple flood peaks simultaneously along the river. The tribu-taries have a highly dynamic regime and all of the subcatchments can release significant discharges at the same time. The natural conditions for flood propagation had been modified due to the hydropower plants thus backwater effect is a major factor at the hy-draulic structures and at the confluences. Modelling such structures requires the substitution of the Saint Venant equations with the basic hydraulic formulas. In this paper I present the building process of the model, the challenges I had to face and the achieved results. The results are then compared to the results of a HEC-RAS based system (Tisza Valley Flood Protection Analysis Center), to the forecasts published by the HHFS, and also to the pure DLCM results. the HHFS.
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