Digital Signal Processing Reference
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based on the assumption that the depth of flow is small compared with the horizontal length scales
involved, resulting in two-dimensional depth-averaged equations. Due to the shallow characteristics of
Lake Edko, this assumption is reasonable.
Figure (7-1): Schematisation and setup of 1D-2D model of the lake catchment system
The hydrodynamics of the study area are described by the one-dimensional unsteady flow simulations
for the Edko Drain, which has a continuous drainage flow and the two-dimensional description of the
simulated water levels, wind driven currents, and tidal flow through the inlet from the Mediterranean
Sea. The boundary conditions for the flow model include the time series inflow to the lake from the
Edko main drain with its contributions from six lateral tributaries, the inflow time series from the
Barseek drain from the south, and the tidal inflow defined as a water level time series at the exit
channel to the Mediterranean Sea. The simulation period for the model is selected to be one year to
cover the different seasonal variations in the discharges and pollution loads. The simulation is done for
two different cases: the first including the inflows from the drains and the tides without the wind and
the second including the wind. The simulation results for the Edko main drain under normal conditions
reveal fluctuating water levels with an average value of 2.60 m during a period of 2 months as shown
in
Figure (7-2)
.
Figure (7-2): Water level variations in Edko main drain
Given the characteristics of the flow regime to the lake from the drains and assuming the influence of
no wind for the given period, the results clearly suggest that water level oscillations in the lake as
recorded by the stations 140 (DS Edko drain) and 152 (middle of lake) shown in
Figure (7-3)
,
are not
due to the inflows, but to the tidal wave that propagates from the ocean inlet through the lake.
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