TABLE OF CONTENTS The importance of focusing on the principles of physics before selecting mathematical models to analyze the dynamic response of coastal and ocean structures is highlighted in Chapter 7.1 and will not be repeated here. In contrast to the dynamics of small solid bodies, the effect of large bodies on an incident wave field is not negligible. Carefully observing what is seen or not seen when long-crested surface gravity waves interact with large solid bodies identifies the following two major physical phenomena:
| Seen: | Waves may be observed radiating away from large, semiimmersed solid bodies and the incident wave may be modified significantly. |
| Not Seen: | When the solid body is sufficiently large compared to the incident wave height and wavelength, no wakes due to flow separation may be observed. |
Figure 8.1 illustrates the linear superposition of an exciting force on a fixed body plus the restoring force (wavemaker theory) on a large solid body. In contrast to Fig. 7.1 in Chapter 7.1, the motion of the large body in otherwise still water generates radiated waves (wavemaker theory). Also in contrast to Fig. 7.1 in Chapter 7.1, the added mass jk and radiation damping ? jk coefficients from the radiated force are not equal to the exciting force coefficients 
and 
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When no flow separation occurs, real fluid effects due to fluid viscosity may be neglected and a potential theory for an ideal fluid...
