the internal structure and algorithms of the computer code need not be 

 learned. Instructions and data are entered through the interface, which, in 

 turn, drives the shoreline change calculation. 



4. This report provides the background of GENESIS as a coastal engi- 

 neering tool, describing both its capabilities and limitations, and serves as 

 a technical reference for operating the modeling system. The methodology of 

 shoreline change modeling is also presented from the perspective of the total 

 developmental environment of a shore protection project, since such modeling 

 cannot be done in isolation from the planning and design processes. 



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Figure 1. Operation of GENESIS through an interface 



5. Prior to development of GENESIS, each application of a shoreline 

 change numerical model required extensive modification of an existing model 

 and, usually, incorporation of special enhancements for the particular 

 application. Considerable time was spent in altering the internal structure 

 of the model computer code and testing the predictions. Through experience 

 gained in a variety of applications over several years, the possibility became 



10 



