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- W2354966 abstract "This project has analysed the long term changes in shoreline position and morphology of LongBeach, located 3 kilometres south of the Hobart CBD in southern Tasmania. Also of interest wasthe effect of the seawall on shoreline recession rates on Long Beach, offshore bathymetry and thesediment cycling in the area.Aerial photography and Geographic Information Systems (GIS) is used to create graphical changemaps of the study area from 1947 to 1998, in order to interpret regions of change. Thisinformation was interpreted to obtain numerical values for the rates of recession or accretion. Thechanges in offshore bathymetry were also investigated through the production of a digital elevationmodel. Spot height data was analysed and interpolated in order to effectively locate offshore sandstores.Results have shown extensive shoreline retreat from 1947, with sand loss being most severe on themid-regions of Long Beach and on Long Point to the north. In comparison, accretion is prevalenton Nutgrove Beach indicated by a developed dune system. Rates of recession have averaged 2metres/year during periods of maximum erosion. This figure is comparable to other shorelinestudies completed in the region. The variations in sediment supply were analysed in relation to theeffect of coastal processes and various coastal engineering structures.It was found that the erosion on Long Beach has been a direct result of a combination of naturaland human-induced changes.• A shift in the balance of northerly and southerly winds has altered the sediment equilibriumthat existed prior to the 1950s, as a result sediment is no longer able to reach Long Beach fromthe northern beach.• The extension of a sewage outfall pipe on Blinking Billy Point has possibly restricted sedimentmovement from the south.• The presence of the seawall on Long Beach combined with a narrow beach has resulted inwaves impacting on the beach during storm events resulting in increased erosion due to wavereflection and scouring.• Foreshore development, the presence of bridges to the north and damming of the DerwentRiver may all have influenced wind patterns and sediment supply to Long Beach which hasresulted in the poor condition of the beach." @default.
- W2354966 created "2016-06-24" @default.
- W2354966 creator A5060907021 @default.
- W2354966 date "2000-11-01" @default.
- W2354966 modified "2023-09-27" @default.
- W2354966 title "The morphology and long term shoreline changes of Long Beach, Sandy Bay" @default.
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- W2354966 hasPublicationYear "2000" @default.
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