s e jefferson county, tx – low volume beach fill · c t i o n 227 jefferson county, tx – low...
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Jefferson County, TX – Low VolumeBeach Fill
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227 Sec 227Project
Project frontsthe McFaddinNWR – area ischarcterized bya broad saltmarsh with amuddysubstrate
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Project Features
2500 ft dune
½ sand
½ sand/clay
Geotube Groins
5 NourishmentCells
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Experiment Groin Cells withLow Volume Beach Fill
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Project Objectives
• Evaluate effectiveness of the dune at reducingoverwash and retaining sand in the swash zone
• Assess performance of clay-cored dune and sand duneat both nourished and unnourished sites
• Determine effectiveness of low volume beach fill toreduce erosion of underlying clay layers
• Evaluate effectiveness of different grain sizes andnourishment rates
• Evaluate effectiveness of groins at retaining sand incells and performance of geotextile structures
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Project Performance – Hurricane Ivan
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227 Hourly Wave Height NDBC 42035 (9/15/2004 - 9/26/2004)
0
0.5
1
1.5
2
2.5
3
Date/Time (UTC(GMT))
Hei
ght (
Met
ers
rela
tive
to M
LLW
)
Hourly Water Levels
Pleasure Pier, Galveston
Wave Heights
NDBC 42035
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Line 15
-6.00
-4.00
-2.00
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2.00
4.00
6.00
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0.00 100.00 200.00 300.00 400.00 500.00
D i st a nc e ( f t )
Aug 5 2004
Sep 212004
Oct 5 2004
Post constructionand post eventprofile data forCell #1
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Line 27
-8.00
-6.00
-4.00
-2.00
0.00
2.00
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D i st a nc e ( f t )
Aug 5 2004
Sep 212004
Oct 5 2004
Post constructionand post eventprofile data forCell #3
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Line 17
-8.00
-6.00
-4.00
-2.00
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0.00 100.00 200.00 300.00 400.00 500.00
D i st a nc e ( f t )
Aug 5 2004
Sep 212004
Oct 5 2004
Dune Response
Sand-cored Dune
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Line 18
-8.00
-6.00
-4.00
-2.00
0. 00
2. 00
4. 00
6. 00
8. 00
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0. 00 100.00 200. 00 300.00 400.00 500. 00
Di st ance ( f t )
Aug52004
Sep212004
Oct 52004
Dune Response
Clay-cored Dune
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Volume change calculations from digitalterrain models, August 14, 2004 andJanuary 14, 2005