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Miscellaneous Applications of Coanda Effect
Published in Noor A. Ahmed, Coanda Effect, 2019
Four experimental configurations were investigated in this study. They were:rectilinear lateral wall, parallel to the jet axis, placed at a distance h from river mouthsimple-shaped channel-harbor layout, with a breakwater and an L-shaped jettyPescara Harbor (1:1000 scale), andLatina harbor proposed design (1:700 scale)
Process-based approach on tidal inlet evolution – Part 1
Published in C. Marjolein Dohmen-Janssen, Suzanne J.M.H. Hulscher, River, Coastal and Estuarine Morphodynamics: RCEM 2007, 2019
D.M.P.K. Dissanayake, J.A. Roelvink
An important harbour is located within the lagoon, and its operation requires regular maintenance dredging of the inlet channel. Recent bathymetric surveys reveal erosion at the entrance of the channel close to the north jetty and sand deposition close to the south jetty. With persistence of these trends, the stability of the north jetty located in the inlet might be threatened in the future.
The Hard Habitats of Coastal Armoring
Published in Elizabeth Mossop, Sustainable Coastal Design and Planning, 2018
Seawalls refer to shore-parallel structures designed to stop erosion and retreat of the shoreline, limit inundation, and ameliorate wave action (Kraus, 1988) (Figure 23.3a). Seawalls are often vertical walls or steep revetments (embankments), primarily made of concrete, natural stone, riprap, steel, and even treated timbers. They are located at the intertidal zone between marine and terrestrial environments, and many are configured to allow other functions such as boat docking (i.e., as found with bulkhead walls). Breakwaters are coastal structures that protect beaches, harbors, urban shorelines from waves and strong currents (Figure 23.3b) (Nichols and Williams, 2009). They are often linear structures constructed of stone or concrete and can be arranged perpendicular to the shore, or parallel offshore, depending on the criteria of the specific site. Two main classifications of breakwaters exist, those that are vertical in section and those that are mounded or sloped in section. They may also be low-crested (slightly subsurface, or near the surface) or intertidal with parts of the structure exposed during high and low tide. (Note: Sometimes the terms jetty and groin are used interchangeably with breakwater.) Although seawalls and breakwaters are functionally and typologically distinct, both may be similarly modified to improve habitat value utilizing similar principles.
Design and development of self-adjusting fixed type jetty
Published in Journal of Applied Water Engineering and Research, 2019
K. K. Pandey, Rajesh Kumar, Keshav Pathak, Ankit Patel, Achin Agrawal, Aman Kr Maurya
The fixed type jetty is usually constructed using concrete, timber work, steel, rubble stones building materials. The type of materials used in the construction of fixed type jetties in the river depends on river flow conditions and operational requirements of the jetty (e.g. Ro-Ro terminal, cargo) (Hickson and Rodolf 2010). Fixed type jetty is constructed when the major water-level fluctuation in the river does not occur. However, in regions where there is a drastic change of water level in water bodies throughout the year, the serviceability of jetty becomes seasonal depending on seasonal/tidal fluctuations of water level. The paper (Hickson and Rodolf 2010) describes the method of construction of a fixed type jetty with the deck of the structure above the high-flood level of the river. It makes the structure nonfunctional during the lean season due to the large free-board caused by a low water level. In the present paper, this has been referred as the ‘seasonal serviceability’ of the fixed type jetty. such constructions have adverse implications on the economy and space. The environmental impact assessment report on Duoro jetties (Bettencourt et al. 2009) has discussed such an impact on the environment.