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Bathymetric Surveys on Ponds 3, 4, & 5, Napa-Sonoma Marshes . U.S. Geological Survey John Y. Takekawa, Lacy M. Smith, & Nicole D. Athearn. Bathymetric Survey Overview. Goal: Document geomorphologic changes that have occurred since restoration of tidal flow

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bathymetric surveys on ponds 3 4 5 napa sonoma marshes

Bathymetric Surveys on Ponds 3, 4, & 5, Napa-Sonoma Marshes

U.S. Geological Survey

John Y. Takekawa, Lacy M. Smith, & Nicole D. Athearn

bathymetric survey overview
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.
bathymetry survey methods
Bathymetry Survey Methods

RTK Antenna

Console with

laptop & RTK

Transducer

Pelican Case with Navisound

bathymetry survey methods1
Bathymetry Survey Methods
  • 200 m East-West & North-South transects

Pond 4

Pond 3

bathymetry survey methods2
Bathymetry Survey Methods
  • South Slough and Breaches
pond 3 2002 south slough breach
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

pond 3 2002 south slough breach1
Pond 3 ~ 2002 South Slough Breach
  • Net sediment gain of 46 m3 or a 1.4 cm thick layer across the area
south slough
South Slough
  • Mean elevation of South Slough region only: -2.85 ± 1.52 m
pond 5 current elevation
Pond 5 ~ Current Elevation
  • Mean elevation: 0.85 ± 0.003 m (mean ± SE) NAVD 88
  • Elevation Range: -1.50 to 1.53 m
pond 5 2001 2009
Pond 5 ~ 2001 - 2009
  • 2001: 0.78 ± 0.003 m (mean ± SE) 2009: 0.85 ± 0.003 m
pond 5 change in elevation
Pond 5 ~ Change in Elevation
  • Net sediment gain: 217,625 m3
  • 7.6 cm layer of sediment throughout the pond
pond 4 current elevation
Pond 4 ~ Current Elevation
  • Mean elevation: 0.81 ± 0.004 m
  • Elevation Range: -2.1 to 1.97 m
pond 4 2001 2009
Pond 4 ~ 2001 - 2009
  • 2001: 0.82 ± 0.003m (mean ± SE) 2009: 0.81 ± 0.004m
pond 4 change in elevation
Pond 4 ~ Change in Elevation
  • Net sediment gain: 19,700 m3
  • 5.4 cm layer of sediment throughout the pond
pond 3 current elevation
Pond 3 ~ Current Elevation
  • Mean elevation: 1.05 ± 0.003 m
  • Elevation Range: -1.60 to 1.90 m
pond 3 2001 to 2009
Pond 3 ~ 2001 to 2009

2001: 1.17 ± 0.002 m (mean ± SE) 2009: 1.05 ± 0.003 m

pond 3 elevation change 2001 2009
Pond 3 ~ Elevation Change 2001-2009
  • Net sediment loss: 594,900 m3
  • 12 cm layer of sediment throughout the pond
pond 3 2005 2009
Pond 3 ~ 2005 - 2009

2005: 0.96 ± 0.002m (mean ± SE) 2009: 1.05 ± 0.003m

pond 3 change in elevation 05 09
Pond 3 ~ Change in Elevation 05-09
  • Net sediment gain: 473,800 m3
  • 9 cm layer of sediment throughout the pond
vegetation
Vegetation
  • See Google Earth
future research
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
acknowledgements
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