ALONGSHORE VARIABILITY OF COASTAL MORHODYNAMICS IN EASTERN LAKE ERIE DUE TO LOW FREQUENCY OSCILLATIONS OF LAKE LEVEL
AbstractLake Erie has the fourth largest surface area, shallowest water depth and smallest volume among the five Great Lakes in North America (NOAA). The dominant wind direction over Lake Erie's is southwest-northeast, along the lake's longitudinal axis. The atmospheric and water level data of the lake demonstrate that high wind and moving pressure systems can result in high storm surge of up to 3 m on the eastern end of the lake and significant drop in the water level at the western end of the lake Due to its shallow depth, such a water level gradient can trigger unique post-storm free water-level fluctuations or seiches in Lake Erie (Farhadzadeh, 2017). The morphodynamic implications of such low frequency oscillations are yet to be studied for the lake's shorelines. Most of studies on the contributions of long waves to beach morphology changes focused on low frequency harmonics induced by short waves, e.g. infragravity waves, edge waves, etc., oscillations with periods of up to a few minutes. Wright and Short (1984) discussed the differences in hydrodynamic processes and relative contributions of various mechanisms to morphological changes of beaches of different states, i.e., reflective, dissipative or intermediate. They concluded that for reflective beaches, incident waves and subharmonic edge waves are dominant while for dissipative beaches currents associated with infragravity standing waves are dominant in nearshore areas. Russell (1993) stated that as low frequency wave energy increases toward a shoreline, the offshore-directed transport at low frequency can become more pronounced.
Dean R. G., and Darlymple, R., A., (2004) Coastal Processes with Engineering Applications. Cambridge University Press.
Dusini, D. S. (2005). The Effect of Lake Erie Water Level Variations on Sediment Resuspension. MSc Thesis, Ohio State University.
Farhadzadeh (2017). “A study of Lake Erie seiche and low frequency water level fluctuations in the presence of surface iceâ€, Ocean Engineering, Vol 135, 1 May 2017, Pages 117-136.
Farhadzadeh, A., Ghazian A. M., and Bokuniewicz, H. (2018). “Contribution of Seiche to Beach Profile Evolution in Eastern Lake Erieâ€, Shore and Beach (in press).
Harter and Figlus (2017). “Numerical modeling of the morphodynamic response of a low-lying barrier island beach and foredune system inundated during Hurricane Ike using XBeach and CSHOREâ€, Coastal Engineering, Volume 120, pp. 64-74.
Kobayashi, and Farhadzadeh (2008). Cross-shore Numerical Model CSHORE for Waves, Currents, Sediment Transport and Beach Profile Evolution. Research Report No. CACR-08-01, Center for Applied Coastal Research, University of Delaware, Newark, Delaware.
Roelvink, Reniers, van Dongeren, de Vries, Lescinski, and McCall (2010). XBeach Model Description and Manual. Unesco-IHE Institute for Water Education, Deltares and Delft University of Technology. Report June, 21 2010 version 6.
Russell, P. (1993). “Mechanisms for beach erosion during stormâ€, Cont. Shelf Res., 13, 1243-1265.Dean R. G., and Darlymple, R., A., (2004) Coastal Processes with Engineering Applications. Cambridge University Press.
Thomas, R., L., Jaquet, J., -M., Kemp, L., W. and Lewis, C., M., F. (1976). Surfical Sediments of Lake Erie. J. Fisheries Res. Board of Canada, 33:385-403.
Wright, L.D., Short, A.D., 1984. “Morphodynamic variability of surf zones and beaches: a synthesis. Marine Geologyâ€, 56 (1-4), 93-118.