Managing Coastal Erosion (1990) / Chapter Skim
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Appendix C: Shore Response Modeling Methods
Appendix C: Shore Response Modeling Methods
Pages 151-160
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From page 151... ...
The presentation below is organized in terms of "Iongshore" and "cross-shore transport models, consistent with the general pattern of individual model development to represent shore response to one or the other of these transport components. [ONGSHOR1: TRANSPORT MODELS Longshore transport models include analytical models (applicable to limited situations of interest)
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From page 152... ...
This solution demonstrates that the longevity of a nourishment project varies directly as the square of the project length and inversely as the 2.5 power of the representative wave height. Numerical ModeLs A number of investigators have developed one-~me numerical models to represent beach planform evolution as a result of natural effects or human-~duced alterations (Le Mehaute and Soldate, 1978 and 1980~.
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From page 154... ...
This is an empirical method that models relationships for the average and maximum expected erosion caused by a storm based on storm tide rise time raised to the 0.8 power and peak storm tide raised to the 1.6 power. Balsillie's approach provides encouraging correlation with numerous field data.
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From page 155... ...
o c CL s n' a' m ~ S {' ~ O CD ._ 0 _ Z C ._ C~ _ ~ 0 O C c ._ a> o S S ,cn o z a \ cn ~D Ct ~ 0 I oo = 1 1 ~ l l 11 \1 1,, cn COO ~ , ~,,~: ~: 7 _ ~ ~ Z O C~ LU ~ O ()
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From page 156... ...
The eroded profile is at a 1:50 slope and extends landward from the dune toe defined as the slope transition between the seaward limit of the dune and the milder beach berm. For this case a portion of the eroded sand is considered to be transported landward; thus, there is no basis (or requirement)
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From page 157... ...
Remove dune above 1 on 50 slope through dune toe 157 \ \ lon40 Slope \ SWFL SWFL Movable I 1 on 12.5 Slope FIGURE C-3 Treatment of sand dune erosion in l00-year event for a coastal good insurance study. SOURCE: Hallermeier and Rhodes, 1988.
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From page 158... ...
His formulation is based on the concept of an equilibrium profile, defined as an average profile that maintains its form, apart from small fluctuations, at a particular water level. The Bruun rule provides a profile of equilibrium with the material removed during shoreline retreat transferred onto the adjacent shoreface, thus maintaining the original nearshore shallow-water profile relative to the increased water level.
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From page 159... ...
Technical Report CERC-87-15, U.S. Army Engineer Waterways Experiment Station, Coastal Engineering Research Center.
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From page 160... ...
1983. Predictive Computational Modelling for Beach and Dune Erosion During Storm Surges.
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