Storm waves affect beach berm and even dunes, resulting in shoreline retreat accompanying by the formation of a submerged bar in the vicinity of the breakers. After a storm wanes, bar material originally may removed from the beachprogressively move landwards by subsequent swell which prevails at the time to assist beach recovery. Such repetitive processes are the nature way to maintain a beach profile in dynamic condition.
This research essay reports an application of SBEACH software to simulate beach profile changes induced by different storm conditions. Upon applying the wave module within SBEACH , the range of broken waves during a storm is first calculated, which is in turn to help locate the range of bar crest. Comparisons are then given for bar crest position and the extent of shoreline recession simulated by SBEACH and the original beach profile data obtained from large wave tank (LWT) tests conducted of the Coastal Engineering Research Center (CERC), US Army Corps of Engineers. The effect of resetting the values to several key parameters in the sediment transport equation is also investigated.
The present study confirms that cross-shore distribution of the maximum wave heights, one of the many important outputs from SBEACH, can be successfully applied for the estimation of wave breaker heights and the prediction of bar crest positions. In addition, from setting different values to some key calibration parameters used in the model (e.g., the default calibration values and Larson’s (1996) calibration parameters for monochromatic waves), bar crest distance offshore Xc/Lo can be linearly related to deep-water wave steepness Ho/Lo, while bar crest position Xc/Lo versus surf similarity parameter