Malvarez, GC, Navas, F, Alcantara, J and Jackson, DWT (2002) Sandy tidal flat morphodynamics? Examples from Strangford Lough in Northern Ireland. JOURNAL OF COASTAL RESEARCH, 41 (Sp. Iss. 41). pp. 160-167. [Journal article]
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In coastal research tidal flats are often classified and investigated in the context of estuarine dynamics due to the widely accepted view that tidal forces are the main responsible for their geomorphological evolution and that biological variables need to play a major role in its evolution. On the other hand coastal morphodyanmics deals mostly with geomorphological evolution of beaches taking a purely geological view on sediment dynamics. In this paper, a discussion is presented in relation to the adequate treatment of tidal flat research by illustrating various numerical and empirical methods used to address morphodynamics on the sandy tidal flats of Newtownards. Common to other sandy tidal flats, the intertidal shores of Newtownards in Strangford Lough (Northern Ireland) are affected by tidal flows (c 0.1 ms(-1)) given the average tidal range of 3.5 m and the action of wind generated waves over the fine grained siliciclastic sediments which frequently shows rippled Surfaces. The results from a wide range of investigations (previously published) that utilized mainly numerical modeling indicated that the flats of Newtownards characterized by a RTR (relative tidal range) factor of 2.3 to 7, are very sensitive to sediment redistribution due to combined water level / wave height effects which implies that wave energy dissipation due to bottom friction the primarily shoaling process during relative high energy events. Using empirical methods designed for beach morphodynamics research, it was found that (i) waves exceeded predicted values given short fetch under westerly winds, (ii) wave penetration was a parameter that proved extremely sensitive for sediment entrainment and was not sufficient to generate bedload sediment transport and (iii) further numerical simulations need to be conducted to achieve further understanding on the role of shoaling and spatial distribution of wave energy dissipation on the translating surf and nearshore zones to achieve a complete morphodynamic classification of these ultra-mega dissipative wave dominated environments.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences|
Faculty of Life and Health Sciences > School of Environmental Sciences
|Research Institutes and Groups:||Environmental Sciences Research Institute|
Environmental Sciences Research Institute > Coastal Systems
|Deposited By:||Professor Derek Jackson|
|Deposited On:||17 Dec 2009 16:08|
|Last Modified:||19 Oct 2010 14:24|
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