

■HP lU 



.... tWI 





*—*-- -—■ „ 





.._. _ *"* **•»■ HI 



Figure 1-15. Initial beach configuration for the Berm Flooding Test 1 



STAG: Foredune Erosion 



A small dune was emplaced on the terrace (Figure 1-16) to examine the 

 process of dune breakthrough and overtopping. Figure 1-17 shows the 

 foredune being overwashed just prior to its complete erosion. 



ST BO: Dedicated Suspended Sediment 



Numerous very short wave runs (typically 1 to 2 min long) were 

 performed with monochromatic waves of different heights and periods for 

 studies of suspended sediment transport in and just seaward of the surf zone. 

 The roving carriage was configured with dense arrays of current meters and 

 OBS's (Figure 1-18), and it was positioned at the break point for each run. 



ST CO: Seawall, Test 3 of 3 



An unscheduled (additional) seawall test was performed to assure that the 

 previous tests were not unusual in showing no significant erosion. One day 

 was spent with a front loader and shovels to remove sand from the channel. 

 The seawall was placed at Station 4. All capacitance gauges and the 

 shoreward current meters were removed prior to the profile lowering opera- 

 tions, and the gauges were reinstalled after the profile was formed, with cur- 

 rent meter installations moved seaward. After the channel was filled with 



21 



Chapter 1 Introduction to SUPERTANK 



