Hrvatske vode, Vol. 24 No. 98, 2016.
Preliminary communication
The impact of culverts on the seawater exchange and wave action in marina waters
Goran Lončar
orcid.org/0000-0002-6466-3677
; University of Zagreb, Faculty of Civil Engineering, Zagreb, Croatia
Damir Bekić
; University of Zagreb, Faculty of Civil Engineering, Zagreb, Croatia
Dalibor Carević
; University of Zagreb, Faculty of Civil Engineering, Zagreb, Croatia
Damjan Bujak
; University of Zagreb, Faculty of Civil Engineering, Zagreb, Croatia
Ivana Bartolić
; Polytechnics of Zagreb, Zagreb, Croatia
Gordana Beg Paklar
; Institute of Oceanography and Fisheries, Split, Croatia
Abstract
The paper presents the results of the conducted numerical simulations of circulation and wave dynamics in the marine waters whose main pier contains a constructed culvert in four variant positions. A hypothetical marina with a length of 300 m, width of 150 m, entrance width of 25 m and variable depths from 3 to 7 m was analysed. The culvert positions (4) and widths (5m and 10m) in the pier were varied as well as the seabed elevations (-1 m, -2 m, -3 m, -5 m, marina seabed) of the marina. The model of seawater circulation and exchange was forced by wind action (of N, NE, E, SE, S, SW, W, NW directions) with a hypothetical distribution of velocities (linear increase from 0 to 5 Bf and linear decrease from 5 Bf to 0) and tidal oscillations during the 24-hour simulation period. The transmission of wind wave energy through the culvert was analysed for the wave heights H = 0.6 m, 1.0 m and 1.5 m and associated wave periods T = 3.1 s, 4.0 s and 4.9 before the pier. The presented results facilitate such selection of the position and geometry of the culvert as to achieve the maximal seawater exchange with the set condition of the permitted wave disturbance. The practical application of the obtained results was presented on the example of the Zadar marina.
Keywords
culvert; marina; Adriatic Sea; numerical model
Hrčak ID:
171614
URI
Publication date:
28.12.2016.
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