Experiment Conditions 
During the 21 days of data collection, from 1 to 21 October 1990, a variety 
of conditions were encountered, as shown in Figure 9. This graph shows the 
wind, as measured at the end of the FRF pier (gauge 3932); the significant 
wave height, wave period, and wave direction measured in 8 m of water (gauge 
3111); the longshore current in the inner bar trough (gauge 2342); and water 
level from gauge 1, relative to the National Geodetic Vertical Datum. After a 
short-duration wave event on 1-2 October, there was an extended period of low 
waves (<1 m) until 9 October, when a "Southeaster" occurred, causing the 
wave height to build to nearly 2 m. There was initial concern that Hurricane 
Lili might interrupt the experiment, but Lili's passage brought only windless, 
long-period swell approximately 2.5 m in height on 13 October. Energetic 
waves (H,,>>1 m) and longshore currents (>1 m/s) continued until the end of 
the experiment. 
As in each previous Duck experiment, significant changes occurred in the 
nearshore profile. Figure 10 illustrates four of the minigrid surveys with the 
current meter locations indicated by vertical lines. The topography was 
rhythmic in the longshore dimension through 9 October, when it began to 
become more linear. The topography was linear on 11 October and remained 
so until the end of the experiment. High longshore flows occurred frequently 
during the experiment; an example of one of the more energetic periods is 
given in Figure 11, which shows longshore currents greater than 1.5 m/sec 
concentrated along the nearshore trough, inshore of the longshore bar crest. A 
plot of the cross-shore currents from the sled (Figure 12) shows onshore flow 
only near the surface in the region of the bar crest and weak offshore flow 
elsewhere. 
Instrument retrieval and cleanup began on 22 October. All pipes and cables 
were removed, with the last being recovered on 25 October. 
The remainder of this report consists of a series of appendices which 
include details about specific DELILAH data sets. Appendix A contains the 
survey data; Appendix B tabulates the video and runup data; Appendix C 
provides summary information about the bottom sediments; Appendix D 
presents pre- and post-experiment current meter calibrations; Appendix E 
summarizes the locations of and data from the stationary instruments; 
Appendix F summarizes the data collected from the instrumented sled; and 
Appendix G provides addresses for the participants and lists publications which 
use DELILAH and SAMSON data. 
This report summarizes the collected data. The actual data are available via 
electronic media including online access and CD-ROM. Connect through the 
World Wide Web to http://frf.usace.army.mil. Since this address may change, 
contact the US Army Engineer Waterways Experiment Station, Coastal and 
Hydraulics Laboratory at 3909 Halls Ferry Road, Vicksburg, MS 39180. 
Chapter 1 Introduction 
