Thompson (1990); Kaihatu, Lillycrop, and Thompson (1989); Farrar and Chen 

 (1987); Clausner and Abel (1986); and Bottin, Sargent, and Mize (1985). 



The HARBD model covers in detail a domain including the harbor and a 

 portion of the adjacent nearshore area (Figure 37). This domain is bounded by a 

 180-deg semicircle in the water region seaward of the harbor entrance (dA in 

 Figure 37) and the land-water interface along the shoreline and harbor (dC in 

 Figure 37). The region defined by these boundaries is denoted Region A. If 

 possible, the semicircle radius should be at least twice the wavelength of the 

 longest incident wave to be modeled (using a typical water depth within the 

 semicircle). Also, the semicircle should encompass any complex offshore 

 bathymetry which strongly influences waves entering the harbor. In general, the 

 semicircle should be as large as practical constraints on grid size and resolution 

 will allow. 



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Figure 37. Representation of HARBD domain 



The area outside the semicircle is treated as a semi-infinite region which 

 extends from a straight coastline seaward to infinity (Region B). This region is 

 assumed to have a constant water depth and no bottom friction. 



Assuming linear, regular waves propagating over mild slope in arbitrary 

 water depth, Chen (1986) derived the governing equation as 



Chapter 4 Numerical Model 



43 



