Geosynthetics October/November 2019 - 32

Reinforcing dunes and bluffs with geosynthetics

During the series of
nor'easters that struck
in March 2018, the
geotextile tubes were
able to keep the toe
of the bluff stabilized
while other sections
of the bluff without
the geotextile tubes
experienced erosion.

32

Geosynthetics | October November 2019

that struck in March 2018, the geotextile
tubes were able to keep the toe of the
bluff stabilized while other sections of
the bluff without the geotextile tubes
experienced erosion. While the geotextile tubes may result in the loss of
sand seaward of the tubes during significant weather events, SBPF's proactive
maintenance program restores the project site to acceptable thresholds during
recovery. The success of this project, particularly in terms of its well-documented
performance and maintenance, has led
to a follow-up proposal, approved by
the Nantucket Select Board and currently under review by the Nantucket
Conservation Commission, to extend the
geotextile tubes an additional 2,953 feet
(900 m) to reinforce additional sections
of the vulnerable bluff (Sutters 2018).

performance and better inform coastal
managers assessing coastal-protection
alternatives to make their coastlines
more resilient.

Conclusion

Disclaimer

Geosynthetic sand containers and geotextile tubes have been used for decades
in emergency or temporary applications to protect homes from storms and
coastal erosion. More recently, there
is an appreciation that these systems,
particularly when covered or used as the
core of a dune, may provide protection
for longer periods (e.g., 15 to 25 years).
The objective of this article is to provide
details of two ongoing field projects in
Montauk, N.Y., and Nantucket, Mass.
In Montauk, field monitoring is being
used to inform town managers about
annual beach replenishment requirements and performance of the GSC
core during exposure. In Nantucket,
demonstrated performance in protecting a portion of a coastal bluff has led to
an application to extend the geotextile
tubes an additional 2,953 feet (900
m) to reinforce additional sections of
bluff. Collection of such performance
data helps to evaluate published design
approaches, develop tools for predicting

Any opinions, findings and conclusions
or recommendations expressed in this
material are those of the authors and do
not necessarily reflect the views of the
National Science Foundation.

Acknowledgments
This material is based upon work
supported by the National Science
Foundation under Grant No. CMMI
# 1 7 1 9 6 7 1 . T h e s upp or t of Ly n n
Bocamazo, P.E., D.CE, and her staff (U.S.
Army Engineer District, New York),
Kimberly Shaw and her staff (Town
of East Hampton), Aram Terchunian
and Benjamin Spratford (First Coastal
Corporation), Sue Genthner (Siasconset
Beach Preservation Fund) and Chris
Timpson (TenCate Geosynthetics) is
acknowledged and greatly appreciated.

References
Buck, M., and Hamilton, R. P. (2017). Southeast
Nantucket Beach monitoring, 72nd survey report. Woods
Hole Group, East Falmouth, Mass.
Chinese, V. (2018). Montauk beach erosion surfaces
sooner as sandbags relent to rising sea levels. https://
www.newsday.com/long-island/suffolk/montaukerosion-1.24071066 (June 24, 2019).
Coghlan, I. R., Carley, J. T., Cox, R. J., Blacka, M., Mariani,
A., Restall, S., Hornsey, W., and Sheldrick, S. (2009).
"Two-dimensional physical modelling of sand filled
geocontainers for coastal protection." Proc., Australian
Coasts and Ports Conf. 2009, Wellington, New Zealand.
Dassanayake, D. T., and Oumeraci, H. (2012). "Hydraulic
stability of coastal structures made of geotextile sand
containers (GSCs): Effect of engineering properties of
GSCs." Coastal Engineering, 33, 1-14.
Hartnett, M. (2017). "Sconset geotextile tube update,
'Sconset Bluff,' Nantucket." Nantucket Coastal Conference
Geotube Update. June.
Heerten, G., Jackson, A., Restall, S., and Saathoff,
F. (2000). "New geotextile developments with


http://https:// http://www.newsday.com/long-island/suffolk/montauk

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
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Geosynthetics October/November 2019 - Cover3
Geosynthetics October/November 2019 - Cover4
Geosynthetics October/November 2019 - Blank1
Geosynthetics October/November 2019 - GeoConf20_1
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Geosynthetics October/November 2019 - GeoConf20_6
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Geosynthetics October/November 2019 - GeoConf20_3
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