The bottom friction dissipation in spectral wave models (SWAN, MIKE SW, STWAVE, etc.) is commonly frequency dependent, while the dissipation due to vegetation only partially accounts for the frequency of the various wave components. For the bottom friction term, the shorter waves may locally be in deep water conditions, while the longer waves are in intermediate to shallow water conditions. Consequently, there exists a cut-off frequency above which the dissipation due to bottom friction vanishes. This cut-off frequency is also applicable to dissipation from submerged vegetation canopies.
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