Geosynthetics October/November 2019 - 30

Reinforcing dunes and bluffs with geosynthetics

FIGURE 3 Cross-shore profiles for the most critical erosion area at the downtown Montauk
beach project site. For reference, the NAVD88 vertical datum is 0.33 foot (0.1 m) above
mean sea level (MSL) for this location.

of the geotextile tubes, a rigorous monitoring and maintenance program was
established with clear failure criteria.
Additionally, funds have been escrowed
to remove the geotextile tubes and
restore the site if the tubes were found
to be ineffective or destructive to the
adjacent natural environment.

Field monitoring and
performance
Various offshore tropical storms and
nor'easters have affected the Montauk
and Nantucket areas, resulting in erosion and exposure of the GSCs and
geotextile tubes. The Montauk site has
been monitored since Tropical Storm
Hermine (September 2016) as part
of a grant from the National Science
Foundation's RAPID (Rapid Response
Research) program for collecting
perishable data (CMMI #1719671).
Numerous post-storm surveys of the
30

Geosynthetics | October November 2019

beach and dune system have been conducted and various cross-shore profiles
and DEM change analyses have been
developed. Cross-shore profiles for the
most critical section of the project site
are shown in Figure 3. The January 2017
storm has been the most severe storm to
affect the site when considering peak
wave characteristics and water levels.
While the severity of various storms has
not had a direct correlation to observed
erosion due to various factors, including mean wave direction during storm
events, the January 2017 storm along
with Tropical Storm Hermine and the
March 2018 nor'easter have provided
notable datasets to support additional
erosion modeling research.
Surveys were performed using RTK
differential GPS, SfM photogrammetry using an UAV, and boat-mounted
LIDAR and interferometric sonar.
Data on peak wave characteristics and
water levels were collected from the
National Oceanic and Atmospheric
Administration's Data Buoy Station
#44017, 23 nautical miles (43 km) SSW
of Montauk Point, N.Y., and Tide Station
#8510560 in Montauk. Each storm produced different levels of erosion and
deposition at the site depending on
the conditions. During calm periods
between weather events, the beach profile recovers with the natural accretion
of sand covering exposed GSCs. Since
the severity of observed storms affecting the downtown Montauk Beach project site has not exceeded an estimated
five-year return period, the combined
waves and surge from storm events has
not produced a condition where waves
are directly affecting the GSC revetment as modeled in wave tank experiments conducted by Dassanayake and
Oumeraci (2012).
However, based on the regular monitoring of the downtown Montauk project
site and survey data provided through



Geosynthetics October/November 2019

Table of Contents for the Digital Edition of Geosynthetics October/November 2019

Geosynthetics October/November 2019 - Cover1
Geosynthetics October/November 2019 - Cover2
Geosynthetics October/November 2019 - 1
Geosynthetics October/November 2019 - 2
Geosynthetics October/November 2019 - 3
Geosynthetics October/November 2019 - 4
Geosynthetics October/November 2019 - 5
Geosynthetics October/November 2019 - 6
Geosynthetics October/November 2019 - 7
Geosynthetics October/November 2019 - 8
Geosynthetics October/November 2019 - 9
Geosynthetics October/November 2019 - 10
Geosynthetics October/November 2019 - 11
Geosynthetics October/November 2019 - 12
Geosynthetics October/November 2019 - 13
Geosynthetics October/November 2019 - 14
Geosynthetics October/November 2019 - 15
Geosynthetics October/November 2019 - 16
Geosynthetics October/November 2019 - 17
Geosynthetics October/November 2019 - 18
Geosynthetics October/November 2019 - 19
Geosynthetics October/November 2019 - 20
Geosynthetics October/November 2019 - 21
Geosynthetics October/November 2019 - 22
Geosynthetics October/November 2019 - 23
Geosynthetics October/November 2019 - 24
Geosynthetics October/November 2019 - 25
Geosynthetics October/November 2019 - 26
Geosynthetics October/November 2019 - 27
Geosynthetics October/November 2019 - 28
Geosynthetics October/November 2019 - 29
Geosynthetics October/November 2019 - 30
Geosynthetics October/November 2019 - 31
Geosynthetics October/November 2019 - 32
Geosynthetics October/November 2019 - 33
Geosynthetics October/November 2019 - 34
Geosynthetics October/November 2019 - 35
Geosynthetics October/November 2019 - 36
Geosynthetics October/November 2019 - 37
Geosynthetics October/November 2019 - 38
Geosynthetics October/November 2019 - 39
Geosynthetics October/November 2019 - 40
Geosynthetics October/November 2019 - 41
Geosynthetics October/November 2019 - 42
Geosynthetics October/November 2019 - 43
Geosynthetics October/November 2019 - 44
Geosynthetics October/November 2019 - 45
Geosynthetics October/November 2019 - 46
Geosynthetics October/November 2019 - 47
Geosynthetics October/November 2019 - 48
Geosynthetics October/November 2019 - 49
Geosynthetics October/November 2019 - 50
Geosynthetics October/November 2019 - 51
Geosynthetics October/November 2019 - 52
Geosynthetics October/November 2019 - 53
Geosynthetics October/November 2019 - 54
Geosynthetics October/November 2019 - 55
Geosynthetics October/November 2019 - 56
Geosynthetics October/November 2019 - Cover3
Geosynthetics October/November 2019 - Cover4
Geosynthetics October/November 2019 - Blank1
Geosynthetics October/November 2019 - GeoConf20_1
Geosynthetics October/November 2019 - GeoConf20_2
Geosynthetics October/November 2019 - GeoConf20_4
Geosynthetics October/November 2019 - GeoConf20_5
Geosynthetics October/November 2019 - GeoConf20_6
Geosynthetics October/November 2019 - GeoConf20_7
Geosynthetics October/November 2019 - GeoConf20_3
Geosynthetics October/November 2019 - GeoConf20_8
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