PART IV: PROJECT EVALUATION AND USES OF GENESIS 

 Scoping Mode and Design Mode 



52. Depending on the stage of the project study, amount and quality of 

 data available to operate the modeling system, and level of modeling effort 

 required, GENESIS can be applied at two different levels, the scoping mode and 

 the design mode. The scoping mode uses minimal data input and might be 

 employed in a reconnaissance study to better define the problem and to 

 identify potential project alternatives. The design mode enters in feasibil- 

 ity or design studies for which a substantial modeling effort is required. 



53. The scoping mode requires the minimum amount of data needed to 

 characterize a project. A scoping mode application is a schematic study with 

 such simplifications made as initially straight shoreline and idealized wave 

 conditions representing, for example, predominant seasonal trends in wave 

 height, direction, and period. In the scoping mode, the model is an explora- 

 tory tool for obtaining estimates of relative trends in shoreline change for 

 different plans. Results from the different alternatives may then be qualita- 

 tively compared without regard to absolute magnitudes. The scoping mode is a 

 first attempt at project definition and the investigative stage of solution. 



54. In the design mode, the objective is to obtain correct shoreline 

 change as well as magnitude and direction of the longshore sand transport 

 rate. The design mode of operation proceeds systematically through data 

 collection, model setup, calibration and verification, and then to intensive 

 work to evaluate alternative designs, finally being used to optimize the final 

 project design. In the design mode, all possible data and ingenuity are 

 brought to bear in the modeling. 



55. The scoping and design modes serve distinct purposes. Similar to 

 the choice of outpatient treatment at a clinic or full treatment at a hospi- 

 tal, certain functions may overlap, but the mode of solution should match the 

 need of the problem. Scoping with GENESIS is made under highly simplified 

 conditions; it definitely should not be considered as a substitute for a 

 design mode application of the model, and scoping results should not be 

 represented as such. 



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