7 Conclusions and 

 Recommendations 



88 



Studies of the wave response of Kahului Harbor have produced valuable 

 information about the existing harbor and possible modifications. Field 

 measurements taken over a period of 18 months at a deepwater directional buoy, 

 a directional array outside the harbor, and four gages inside the harbor were 

 extremely helpful in understanding present harbor behavior. Numerical 

 modeling of the existing harbor also helped to explain the response to short and 

 long waves. 



The numerical model was used to simulate the behavior of 1 1 alternative 

 modifications to the harbor. Model results are compared with criteria for 

 operational acceptability and with experience in the existing harbor to the extent 

 possible. The effectiveness of proposed new harbor areas for wind wave and 

 swell protection often has little relationship to protection from oscillations. 

 These two aspects of pier operability must both be considered in judging success 

 of the alternative plans. 



An overview of performance of the alternative plans is given by their success 

 relative to a simple, meaningful criterion. For wind waves and swell, success 

 was defined as having Hp- 1 ft less than 1 percent of the time at all basins along 

 the pier (Table 21). The 1 percent level was chosen because the existing Piers 1 

 and 2 (which are considered successful) meet this criterion but the seaward ends 

 of Piers 1 and 2 (which are believed to be marginal) slightly exceed the criterion. 

 Thus successful piers in Table 21 should be comparable or better than the exis- 

 ting facilities for wind waves and swell. 



A similar overview of plan performance for harbor oscillations is given in 

 Tables 22 and 23. The criteria are expressed in terms of percent exceedances of 

 H slong =lO cm. The threshold percent values were selected to be slightly higher 

 than the existing harbor facilities. 



Specific conclusions and recommendations are as follows: 



a. Plan 1. Not recommended because of large long wave amplifications at 

 proposed passenger pier. 



Chapter 7 Conclusions and Recommendations 



