u.s. department of the interior u.s. geological survey bathymetric surveys on ponds 3, 4, & 5,...
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U.S. Department of the InteriorU.S. Geological Survey
Bathymetric Surveys on Ponds 3, 4, & 5, Napa-Sonoma Marshes U.S. Geological Survey
John Y. Takekawa, Lacy M. Smith, & Nicole D. Athearn
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Bathymetric Survey Overview
Goal: Document geomorphologic changes that have occurred since restoration of tidal flow New baseline data – Post-Breach Ponds 4 and 5 Comparable data
Pond 3: 2001 (Towill) vs. 2009, 2001 vs. 2005, 2005 vs. 2009
Ponds 4 & 5: 2001 (Towill) vs. 2009
Additional mapping of original South Slough breach, all pond breaches, and pond islands.
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Bathymetry Survey Methods
Pelican Case with Navisound
RTK Antenna
Console with
laptop & RTK
Transducer
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Bathymetry Survey Methods
200 m East-West & North-South transects
Pond 3
Pond 4
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Bathymetry Survey Methods
South Slough and Breaches
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Pond 3 ~ 2002 South Slough Breach
Mean elevation 2006: -3.122 ± 0.032 m (mean ± SE) NAVD 88 Mean elevation 2009: -3.108 ± 0.031 m
2006 2009
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Pond 3 ~ 2002 South Slough Breach
Net sediment gain of 46 m3 or a 1.4 cm thick layer across the area
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South Slough
Mean elevation of South Slough region only: -2.85 ± 1.52 m
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Pond 5 ~ Current Elevation
Mean elevation: 0.85 ± 0.003 m (mean ± SE) NAVD 88
Elevation Range: -1.50 to 1.53 m
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Pond 5 ~ 2001 - 2009
2001: 0.78 ± 0.003 m (mean ± SE) 2009: 0.85 ± 0.003 m
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Pond 5 ~ Change in Elevation
Net sediment gain: 217,625 m3
7.6 cm layer of sediment throughout the pond
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Pond 4 ~ Current Elevation
Mean elevation: 0.81 ± 0.004 m
Elevation Range: -2.1 to 1.97 m
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Pond 4 ~ 2001 - 2009
2001: 0.82 ± 0.003m (mean ± SE) 2009: 0.81 ± 0.004m
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Pond 4 ~ Change in Elevation
Net sediment gain: 19,700 m3
5.4 cm layer of sediment throughout the pond
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Pond 3 ~ Current Elevation
Mean elevation: 1.05 ± 0.003 m
Elevation Range: -1.60 to 1.90 m
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Pond 3 ~ 2001 to 2009
2001: 1.17 ± 0.002 m (mean ± SE) 2009: 1.05 ± 0.003 m
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Pond 3 ~ Elevation Change 2001-2009
Net sediment loss: 594,900 m3
12 cm layer of sediment throughout the pond
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Pond 3 ~ 2005 - 2009
2005: 0.96 ± 0.002m (mean ± SE) 2009: 1.05 ± 0.003m
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Pond 3 ~ Change in Elevation 05-09
Net sediment gain: 473,800 m3
9 cm layer of sediment throughout the pond
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Vegetation
See Google Earth
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Summary
0.6
0.8
1
1.2
1.4
2000 2002 2004 2006 2008 2010
Me
an
Ele
va
tio
n (
m)
Pond 3
Pond 4
Pond 5
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Future Research
Additional bathymetric surveys over time Bathymetric survey on 9 & 10 Aerial and Ground vegetation surveys Elevation survey of colonizing plants Continued monitoring of bird pond use
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Acknowledgements
Funding provided by USGS and CA State Coastal Conservancy
Project support provided by: I. Woo, K. Spragens, K. Thorne, J. Shinn, A. Brand, K. Brailsford, C. Daggett, P. Gibson, T. Edgarian, S. Bishop, S. Piotter, K. Hirsch, and H. Haselbach