Aerospace & Defense Technology - October 2021 - 31

Tech Briefs
meter). The U.S. Army Corps of Engineers
(USACE), U.S. Naval Oceanographic
Office, and National Oceanic
and Atmospheric Administration
(NOAA) formed the Joint Airborne
Lidar Bathymetry Technical Center of
eXpertise in 1998 to support coastal
mapping requirements and committed
to surveying the U.S. coastline
every 5 years with airborne lidar. As a
result of these and other efforts, coastal
monitoring with airborne lidar data
has provided a range of insights into
coastal change since the late 1990s.
While airborne lidar sampling provides
significant coverage, it also demands
significant resources for deployment
and may lack the temporal and
spatial resolution necessary to adequately
map the evolution of coastal features
at scales relevant to the forcing
conditions. To bridge the gap between
airborne lidar coverage and terrestrial
lidar scanner resolution and ease of deA
Ford F350 pickup truck served as the data collection platform
for this research.
ployment, CHL developed the Coastal
Lidar and Radar Imagng System
(CLARIS), a mobile, truck-based lidar system
that can survey 10s of kilometers of
coast at high-resolution (100s to 1000s of
points per meter) in 1 day.
Mobile, terrestrial-based lidar systems
offer the benefits of traditional stationary
high-resolution scanning, and given a
high-precision inertial navigation system,
allow for large regional surveys to
be conducted within hours at comparable
resolution (Spore and Brodie
2017). CHL utilizes CLARIS to monitor
beach elevation throughout the year
on seasonal scale as well as before, during,
and after extratropical, subtropical,
and tropical storms or hurricanes.
The regular, frequent collection along
the same segments of shoreline reduces
the uncertainty that often accompanies
more sporadic, interannual
beach surveys (Le Mauff et al. 2018).
Frequent high-resolution sub-aerial
beach topographic surveys are critical to
understanding variability of beach morphological
evolution across different timescales.
Continued data collection can support
scaling observations between these
shorter events, seasonal, or year-length
fluctuations to decadal scale change. The
observational data can also be used to diZero
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Aerospace & Defense Technology - October 2021

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