34 



It was noted in the model investigation that wave-induced currents and 

 sediment migration were toward the north, for test waves from 101, 88, and 

 75 deg, both with and without the north breakwater installed at the Saco River 

 mouth. The small test waves generated from 56 deg resulted in weak eddying 

 currents along the beach with no sediment movement to the north or south. 

 Hindcast data from the wave exposure window (56 to 101 deg) at Camp EUis 

 Beach indicate that only about 10 percent of the wave occurrences (from the 

 1956-1975 period of record) approach from the 56 deg (45 deg deepwater) 

 direction. Therefore, net sediment movement in the Camp Ellis Beach area 

 should be northerly. The model indicated no southerly transport; however, had 

 larger waves from 56 deg been supported by the hindcast and generated in the 

 model at a deeper, storm-induced water level, a southerly migration of 

 sediment may have resulted as hypothesized in USAEWES (1991) and 

 USAED, New England (1992). Based on hindcast conditions used to force the 

 model, only northerly transport was observed. 



Chapter 4 Tests and Results 



