Comparison of 1D and 2D hydraulic models for floods simulation on the medjerda riverin tunisia

In tunisia,especially in the medjerda watershed the recurring of floods is becoming more frequent. the purpose is to improve the different methods of hydraulic modelling,mainly regarding the floodplain modelling. thus,weare interested in hydraulic modelling applied to the medjerda river. two types of models are examined in this paper; one-dimensional models using hec ras (1d) and mike 11 (1d),and a two-dimensional one using telemac 2d. these models recalibrated on data measured during the spectacular flood occurred in january 2003 in tunisia; and a comparison of the simulation results of these 1d and 2d modelsisperformed. the objective of these comparisons is to showthe benefits and limitations of tested models in flood forecasting. the analysis of the results shows a good agreement between 1d and 2d models and that the reliability of results depends strongly on the accuracy of available data.