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Abstract Timsah Lake and its northern and southern open boundaries in This thesis is devoted to investigating the characteristics nd circulation of currents and the tidal regime in Timsah Lake lnd at its northern and southern open boundaries in the Suez :anal. The investigation consists of two parts: (i) Site inves- ;igations ( measurements and analysis ), (ii) Testing the ralidity of the mathematical hydrodynamic modelling technique in f such complex system using Leendertse’s two-dimensional semi- mplicit multi-operational finite difference scheme. A Measurement programme was carried out to measure the ecessary data needed for the study. The programme consisted of idal elevation gauging, and current speed and direction easurements in the Suez canal at the northern and southern open boundaries of the lake, and at other selected locations ( stations ) in the lake. The programme included observation of wind speed and direction, and some salinity measuremer-i;s. All measurements were carried out simultaneously. The data obtained from the measurements are presented herein. The measurements are very useful in getting a ”portrait” of the tidal regime, and understanding the controlling factors in the current dynamics he Suez canal as presented in the conclusions. To test the validity of the mathematical modelling technique, he Leendertse’s scheme was used to model the Timsah Lake ydrodynamic system. From the field measurements, different Itions of the wind and tidal elevations at the open bound- Of the lake were selected to be used as the basis of the T data for the model to compute the corresponding currents Water surface elevations in the lake, and to compare the f Putted results to the measurements. In these tests of Ldity, the other factors affecting current circulation such The bottom topography and roughness, the lake configuration, The coriolis force were included. The model has been able Reasonably predict the tidal dynamics of Timsah Lake hydro- lamic system, as evidenced by the very good agreement of lputed water levels, and reasonable agreement of computed ~rent results to the site measurements of Timsah Lake. The )w pattern in the lake predicated by the model is also ~sented. The object of this study has been accomplished. Considerable sight into the current and tidal dynamics of Timsah Lake stem has been gained as presented in the conclusions, and an r.urate set of current and surface elevatic~ data has been hieved for use by environmental and interested engineers. |