that area, but that mooring conditions are considered satisfactory. 

 Further, although difficulties resulting from surge currents have been 

 reported in the entrance to the existing marina in Monterey Harbor, navi- 

 gation and mooring conditions in the marina are generally considered to 

 be acceptable. Thus, for this investigation, surge conditions in the 

 existing marina and in the proposed additional small-craft basins in 

 Monterey Harbor were assumed to be satisfactory if intermediate- and 

 long-period wave heights and resulting currents in the existing and pro- 

 posed basins and entrances do not exceed those that presently occur in 

 the existing marina. Adequate criteria have not yet been developed to 

 ensure satisfactory navigation and mooring conditions in small-craft har- 

 bors for short-period waves (waves with periods from about 5 to 20 seconds) 

 However, when resonant surge conditions occur for small craft moored in 

 present-day marinas, small wave heights can result in the breaking of 

 mooring lines when the craft are incorrectly moored. In this study, 

 satisfactory conditions are assumed if short-period wave heights do not 

 exceed 1.5 feet in the inner basins and 4.0 feet at the basin entrances 

 and in the fairway. 



(g) The Model . Results of a feasibility study (Wilson, 

 Hendrickson, and Kilmer, 1965), showed that the wave periods of concern 

 were likely to be less than 3 minutes and certainly less than 7 minutes. 

 Therefore, the vicinity of Mussel Point (about halfway between Point 

 Pinos and Monterey; Fig. 4-26) was selected as the seaward limit of the 

 model. Further, the intermediate- and long-period wave energy moving 

 across the rim of the deep submerged canyon on the northern edge of the 

 Continental Shelf (for the southern part of the bay) was concluded to be 

 insignificant and the generation of intermediate- and long-period waves 

 from this direction would be unnecessary. Thus, a side boundary for the 

 model, normal to the coast from near the inlet to Laguna del Rey, would 

 not seriously interfere with the oscillating regime, provided that enough 

 wave-filter material was installed along the wall to prevent wave reflec- 

 tion. For the same reason, it was recommended that wave-filter material 

 be placed in front of the wave generator. The recommended limits for a 

 surge action model of Monterey Harbor were established as shown in Fig- 

 ure 4-26, with two wave-generator units to reproduce the correct direc- 

 tions of approach of the intermediate- and long-period waves south of 

 Mussel Point. On the basis that the prototype harbor area to be modeled 

 was about lo'* by 10^ feet, a horizontal linear scale of 1:200 was sug- 

 gested for a convenient model size of 50 by 50 feet. A vertical scale 

 of 1:120 was also suggested, which would give a distortion factor of 

 1.67 for the model. The maximum water depth in the marina (about 16 

 feet) would then be about 0.13 foot in the model, which is considered 

 an adequate working depth in the inner basin. Wilson, Hendrickson, and 

 Kilmer (1965) considered the 1.67 distortion factor as satisfactory for 

 reliable reproduction of long-period waves down to about 30 seconds. 

 However, becaiise the model would also be used to study the effects of 

 short-period waves (in the range of 5 to 20 seconds) , and because these 

 waves can best be investigated in undistorted models, a 1:120 linear 

 scale was used for both the horizontal and vertical dimensions. The 

 design and operation of the model were based on the recommendations in 



265 



