Inhalt des Dokuments
Quantification of exchange processes between a bay
and a river using a two-dimensional high-resolution flow and transport
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Selge,F., Gunkel,G., Rossiter,K., Jourieh,A. & Hinkelmann,R.
||Proceedings 17th IWA-DIPCON Conference, Berlin, Germany.
||Hydrodynamics and transport simulations were conducted with the
modeling software TELEMAC-2D on Icó-Mandantes bay, a branch of the
Itaparica reservoir. The bay has a maximal operational water level
amplitude of 5 m and is suffering for eutrophication and algae bloom.
Therefore, we investigated low and high water level scenarios with two
different high resolution meshes, with the purpose to deeper
understand their impact on transport of substances and to improve the
watershed management. In particular, nutrient emissions from a
hypothetical net cage aquaculture system located in the bay were
investigated on half-year cycles. We observed a relevant impact on
water quality for a tilapia production of 130 t y-1, i.e. after 6
months simulation we obtained around 8 µg P L-1 and 6 µg P L-1
at the source of emissions, for low and high water scenario,
respectively. Additionally, uniform distribution of a
mass-conservative passive tracer in the whole bay was imposed as
initial condition to quantify water retention times of the bay, which
resulted higher for the high water level scenario compared to the low,
and even higher when we took evaporation into account (about 725