. Analytical solutions of the one-line model of shoreline change. Coast changes; Beach erosion; Shore protection. L tan a ol (83) The elapsed time is normalized by the quantity L /e . Although mass is conserved across the boundary between the two solution areas, the gradient of the shoreline is not continuous at this point. e,t. 0 1 2 ALONGSHORE DISTRNCE (x/L) Figure 37. Final shoreline position in the vicinity of a shore- parallel detached breakwater (6 =, a .= rad , «o2 = 0) Shoreline Change at a Seawall 79. The function of a seawall is to prevent the shoreline from retre
. Analytical solutions of the one-line model of shoreline change. Coast changes; Beach erosion; Shore protection. L tan a ol (83) The elapsed time is normalized by the quantity L /e . Although mass is conserved across the boundary between the two solution areas, the gradient of the shoreline is not continuous at this point. e,t. 0 1 2 ALONGSHORE DISTRNCE (x/L) Figure 37. Final shoreline position in the vicinity of a shore- parallel detached breakwater (6 =, a .= rad , «o2 = 0) Shoreline Change at a Seawall 79. The function of a seawall is to prevent the shoreline from retreat- ing along a specific coastal reach. If the shoreline remains well seaward of the seawall, there will be no influence of the seawall on the shoreline evolu- tion. If the shoreline retreats to the seawall, the location of the seawall determines the minimum allowable shoreline position. If erosion takes place beside a seawall (flanking), various changes in the shoreline position might occur depending on the characteristics of the seawall and the incident waves. If flanking of the seawall is not possible (see Figure 38), the solution for the plan shape of an eroded shoreline will be the same as for erosion downdrift of a groin (Equation 64, with opposite sign). In this case, the seawall is functioning as a semi-infinite structure. 60. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Larson, Magnus; Hanson, Hans; Kraus, Nicholas C; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ); United States. Army. Corps of Engineers. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service]
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