Table 1 

 Major Capabilities and Limitations of GENESIS Version 2 



Ca pabilities 



Almost arbitrary numbers and combinations of groins, jetties, detacbed 

 breakwaters, beach fills, and seawalls 



Compound structures such as T-shaped, Y-shaped, and spur groins 



Bypassing of sand around and transmission through groins and jetties 



Diffraction at detached breakwaters, jetties, and groins 



Coverage of wide spatial extent 



Offshore input waves of arbitrary height, period, and direction 



Multiple wave trains (as from independent wave generation sources) 



Sand transport due to oblique wave incidence and longshore gradient in height 



Wave transmission at detached breakwaters 



Limitations 



No wave reflection from structures 



No tombolo development (shoreline cannot touch a detached breakwater) 



Minor restrictions on placement, shape, and orientation of structures 



No direct provision for changing tide level 



Basic limitations of shoreline change modeling theory 



Comparison of Beach Change Models 



28. In this section, capabilities of the shoreline change model are 

 compared with those of other types of beach change models. Figure 3 extends 

 and updates the classification scheme of Kraus (1983, 1989), developed for 

 comparing the capabilities of beach evolution models by their spatial and 

 temporal domains of applicability. Ranges of model domains were estimated by 

 consideration of model accuracy and computation costs. These ranges will 

 expand as knowledge of coastal sediment processes improves, experience is 

 gained in model usage, wave and shoreline position data become available, 

 numerical schemes become optimized, and computer costs decrease. 



20 



