apparent of combining all major features of previous site-specific models into 

 one generalized shoreline change modeling system. A framework for unifying 

 model applications was devised by Hanson (1987, 1989) and centers on the 

 concept of "wave energy windows," described in Part V. Also, an important 

 task was the development of an interface that would allow a user to interact 

 easily with the modeling system without demanding specialized knowledge of the 

 internal code. Much of this report deals with the interface, and technical 

 details and examples are provided to demonstrate use of the interface as well 

 as capabilities and limitations of the modeling system. 



6. The predecessor model to GENESIS (Kraus 1988a, b,c,d) was developed 

 in the course of the Nearshore Environment Research Center project conducted 

 in Japan (Horikawa and Hattori 1987). The structure of GENESIS was developed 

 by Hanson (1987) in a joint research project between the University of Lund, 

 Sweden, and the Coastal Engineering Research Center (CERC) , US Army Engineer 

 Waterways Experiment Station. Descriptions of GENESIS Version 1 have been 

 given by Hanson (1987, 1989). 



7. Version 2 of GENESIS, described here, represents a substantial 

 upgrading of the original model. Major enhancements include: 



a. Wave transmission at detached breakwaters. 



b. Capability to place either a diffracting or nondiffracting groin 

 or jetty on a lateral boundary. 



c. Inclusion of an arbitrary number of wave sources. 



d. Improvement in the interface. 



e. Inclusion of warning messages. 



Mode of Interaction with GENESIS 



8. GENESIS may be installed on various operating systems having 

 different job control procedures. In this report, discussion of computer 

 hardware and job control , which vary from office to office and change as 

 systems change, is not given. System-dependent details are provided separ- 

 ately with the version of GENESIS at the user's site. For the purpose of this 

 manual, it is assumed that an executable file containing GENESIS is loaded on 

 the system and that it is available to be run. It is also assumed that the 



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