Presentation on theme: "U.S. Department of the Interior U.S. Geological Survey Bathymetric Surveys on Ponds 3, 4, & 5, Napa-Sonoma Marshes U.S. Geological Survey John Y. Takekawa,"— Presentation transcript:
U.S. Department of the Interior U.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
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 Ponds 4 & 5: 2001 (Towill) vs Additional mapping of original South Slough breach, all pond breaches, and pond islands.
Bathymetry Survey Methods Pelican Case with Navisound RTK Antenna Console with laptop & RTK Transducer
Pond 3 ~ Change in Elevation Net sediment gain: 473,800 m 3 9 cm layer of sediment throughout the pond
Vegetation See Google Earth
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 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