engleski

The impact of the culverts on sea water exchange in the marinas

This study demonstrates the results of 3D numerical simulations carried out on seawater circulation and exchange with the aim of quantifying the contribution of pipe culverts and wind in the exchange of 'old' seawater from a marine aquatorium with 'exterior' seawater. As a comparative parameter, so-called 'e-folding' time was used for determining the quality of individual pipe culvert solutions. The applied research methodology defined the optimal position for (implementing) culvert construction in characteristic environmental conditions (intensity of tidal signal and wind activity from different directions and with different strengths) as well as the detection of areas with longer-term seawater retention in the marine aquatorium. Within the implementation of the numerical simulation besides the culvert position, basic geometric marine features (input size, protruding or regressed position of marina) were varied. The results demonstrate that the most intensive seawater exchange is stimulated by the construction of culverts in the breakwater opposite the marina entrance. Wind activity contributes significantly to seawater exchange ; in particular, winds from the directions SE and NE ensure e-folding time reductions for by an average of 26% (SE) and 28% (NE) in relation to conditions without wind action. An increase of marina entrance by 100% improves the seawater exchange to a lesser extent then less than culverts implementation.

marinas ; numerical model ; seawater exchange

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