4 Numerical Model 



Objectives and Approach 



The numerical model studies have three main objectives: 



a. Calibrate and validate the numerical model with field data. 



b. Advance understanding of the existing harbor wave response. 



c. Evaluate the effect of proposed harbor modifications on harbor wave 

 response. 



The numerical model used for the studies, HARBD, is the standard WES tool 

 for numerical harbor wave investigations. The model includes the following 

 assumptions: 



a. No wave transmission through the breakwaters. 



b. No wave overtopping of structures. 



c. Structure crest elevations above the water surface cannot be tested or 

 optimized. 



d. Currents in the channel cannot be evaluated. 



e. Wave breaking effects in the entrance and harbor cannot be considered. 



/ No nonlinear effects are considered. 



g. Diffraction around structure ends is represented by diffraction around a 

 blunt vertical wall with specified reflection coefficient. 



Despite limitations imposed by the above assumptions, HARBD is considered 

 suitable for meeting the numerical modeling objectives of the Kahului Harbor 

 study. 



Chapter 4 Numerical Model 41 



