Abstract
For investigating the basic performance of the third generation wave model SWAN(version 40.91ABC), wave computations are conducted under both uniform winds and actual storm(2014 April 3-4 Low Depression) conditions, in cases where any of the wave growth and decay terms, sea drag coefficient(Cd) formulas, space resolution and time increment are changed. The main results are as follows. In uniform winds conditions, 1)the relation between dimensionless energy ε* and dimensionless fetch F* depends significantly on an applied growth and decay formula and any of ε* obtained from different formula is greater than the empirical relation-based ε* , 2)the Janssen formula yields the greatest ε* of the three formulae used and the effect of Cd formula on the ε* − F* relation is negligible, 3)the effect of U10 on ε* − F* relation is hardly found and a slope value in the relation between peak period and moments-based mean period is close to an empirical value of 1.1. In storm conditions, 4)the effect of either Cd formula or wave growth and decay formulas on the maximum wave height is significant, in cases where any of SWAN with various input parameter conditions yields reliable estimates of wave heights and periods, 5)the effect of space resolution on wave heights and periods is hardly detected but the effect of time increment is significant in the Janssen formulation case.
