1 Introduction 
During the fall of 1990, DELILAH, The Duck Experiment on Low- 
frequency and Incident-band Longshore and Across-shore Hydrodynamics, was 
conducted at the U.S. Army Engineer Waterways Experiment Station, Coastal 
and Hydraulics Laboratory's, Field Research Facility (FRF) located in Duck, 
North Carolina (Figure 1). This experiment was conceived as an outgrowth of 
SAMSON, The Sources of Ambient MicroSeismic Oceanic Noise experiment 
which also occurred that fall. DELILAH was developed to take advantage of 
the directional wave information being obtained from the instruments installed 
and data gathered during SAMSON. These experiments deployed 87 
instruments from the shoreline out to the 13-m depth contour, and collected a 
vast amount of data useful to many coastal research efforts. This report will 
first briefly describe SAMSON, but its purpose is to summarize the 
investigations and data collected only during DELILAH. 
- SAMSON 
This experiment, sponsored 
by the Office of Naval Research, 
was an investigation into the 
causes of ocean bottom 
microseisms (very small 
fluctuations which can create 
significant noise in underwater 
acoustic transmissions). In order , , aa 
to monitor these microseisms, a Dems un Ocean 
number of different arrays of ; ty 6 Oregon inet 
instruments were deployed. To ( sae) 
measure the directional wave 
field and to monitor nonlinear 
pressure fluctuations at depth, 
: : Figure 1. Location of the Field 
which may excite the Research Facility 
microseisms, the Scripps 
Chapter 1 Introduction 
