Ecosystem And Assimilative Capacity Of Rivers
With Control Structures
Author(s)
E. Imam & S. El Baradei
Abstract
This research studies the impact of water level control structures on selfassimilative
capacity of rivers and on their ecosystem. Constructing a water level
control structure in a river reach will alter its hydraulics which will impact its
water quality, thermal regime and fish habitat. A mathematical model is
developed to simulate the river hydraulics, water quality, temperature, and fish
habitat. The diurnal dissolved oxygen concentrations are investigated to see their
impact on the fish. A case study of a Nile River reach was studied, to investigate
the impact of the existence of the Esna barrage on the water quality in its
upstream reach. The barrage has negative impacts on the upstream selfassimilative
capacity of the rivers. The waste load that the river could take was
only 54% from that load when there was no barrage and at low flow conditions.
At high flow conditions this load changed to 78%. The diurnal DO variation was
simulated and it was concluded that the diurnal photosynthesis has an effect on
the diurnal cycle of the DO. The barrage has a positive effect on the fish habitat.
The weighted usable area (WUA) of Tilapia fish is doubled in case of the barrage
existence. The barrage causes a slight decrease in the water temperature. The
average change in the diurnal temperature for the studied reach in the month of
June is about 0.13ºC difference between the cases of existence and nonexistence
of barrage.
Keywords: self-assimilative (self-purification) capacity, hydraulic structure,
mathematical modeling, dissolved oxygen concentrations, photosynthesis and
respiration, fish habitat, thermal regime and water temperature.
Keywords
self-assimilative (self-purification) capacity, hydraulic structure,
mathematical modeling, dissolved oxygen concentrations, photosynthesis and
respiration, fish habitat, thermal regime and water temperature.
Related Book
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