CHAPTER 8 



ENGINEERING ANALYSIS: CASE STUDY 



I. INTRODUCTION 



This chapter presents as examples of the techniques presented in this 

 manual a series of calculations for the preliminary design of a hypothetical 

 offshore island in the vicinity of Delaware Bay. The problem serves to 

 illustrate the interrelationships among many types of problems encountered in 

 coastal engineering. The text progresses from development of the physical 

 environment through a preliminary design of several elements of the proposed 

 structure. 



For brevity, the design calculations are incomplete; however, when 

 necessary, the nature of additional work required to complete the design is 

 indicated. It should be pointed out that a project of the scope illustrated 

 here would require extensive model testing to verify and supplement the 

 analysis. The design and analysis of such tests is beyond the scope of this 

 manual. In addition, extensive field investigations at the island site would 

 be required to establish the physical environment. These studies would 

 include a determination of engineering and geological characteristics of local 

 sediments, as well as measurement of waves and currents. The results of these 

 studies would then have to be evaluated before beginning a final design. 



While actual data for the Delaware Bay site were used when available, 

 specific numbers used in the calculations should not be construed as directly 

 applicable to other design problems in the Delaware Bay area. 



II. STATEMENT OF PROBLEM 



A 300-acre artificial offshore island is proposed in the Atlantic Ocean 

 just outside the mouth of Delaware Bay. The following are required: (1) 

 characterization of the physical environment at the proposed island site and 

 (2) a preliminary design for the island. Reference is made throughout this 

 chapter to appropriate sections of the Shore Protection Manual. 



III. PHYSICAL ENVIRONMENT 



1 . Site Description . 



Figures 8-1 through 8-5 present information on the general physical 

 conditions at the proposed island site. Site plans showing the island 

 location, surrounding shorelines, and bathymetry are given. 



8-1 



