Appendix A 



Saco Bay Nearshore Wave 



Estimates 



Introduction 



This section of tlie report describes procedures and results of the nearshore 

 wave estimates used in the Saco Bay physical model study. Included are an 

 overview presenting the scope of the numerical wave estimation, a general 

 description of the Saco Bay wave climate and available information, numerical 

 model selection, description of the numerical wave model, and procedures used 

 to develop various input and output in this task. A brief discussion of the 

 tabular and graphical results obtained by different analysis methods is also 

 presented. 



Scope 



The purpose of the numerical wave modeling task was to develop nearshore 

 wave conditions for use in the subsequent physical model study for Saco Bay. 

 The experimental part of the study was to investigate waves and wave motion 

 in the immediate vicinity of two jetties and adjacent beaches to the north of 

 the mouth of Saco River in a controlled laboratory setup. 



Figure Al shows the part of the numerical model grid for Saco Bay that 

 was investigated in a scaled laboratory study. It shows the location of several 

 transects (TR) selected for numerical model output in the nearshore region 

 where erosion problems have been observed. In the laboratory tests, a wave 

 generator was positioned along TR 3. The wave generator was driven with 

 wave input to investigate the effects of waves on the coastline, sediment move- 

 ment, and jetties. Therefore, the main objective of the numerical modeling 

 was to provide wave conditions to be used in the laboratory tests as input to 

 the wave generator. Numerical model output was needed only at TR 3. Out- 

 put provided at TR 1, 2, 5, 6, and 7 was only for infonnation purposes and 

 may be used to compare laboratory measurements and numerical model results. 



Appendix A Saco Bay Nearshore Wave Estimates 



A1 



