David H. Schoellhamer

Does Central Valley runoff control sediment supply to South San Francisco Bay?

lorenzof — Thu, 30 May 2019 19:38:21 +0000

Does Central Valley runoff control sediment supply to South San Francisco Bay?

Does Central Valley runoff control sediment supply to South San Francisco Bay? Title Slide

lorenzof Thu, 05/30/2019 - 12:38

Presentation

Author(s)

David H. Schoellhamer

Date

Tue, 07/16/2013 - 9:05am

Will there be enough sediment?

lorenzof — Thu, 30 May 2019 00:17:51 +0000

Will there be enough sediment?

Will there be enough sediment? (slide 1)

lorenzof Wed, 05/29/2019 - 17:17

Presentation

Author(s)

David H. Schoellhamer

Date

Thu, 10/22/2015 - 10:00am

Suspended-sediment dynamics in the tidal reach of a San Francisco Bay tributary

admin — Thu, 23 Nov 2017 00:21:53 +0000

Suspended-sediment dynamics in the tidal reach of a San Francisco Bay tributary admin Wed, 11/22/2017 - 16:21

Document Category

Scientific Reports

Author(s)

Gregory G. Shellenbarger

Maureen A. Downing-Kunz

David H. Schoellhamer

Date

2014-10-19

Summary

To better understand suspended-sediment transport in a tidal slough adjacent to a large wetland restoration project, we deployed continuously-measuring temperature, salinity, depth, turbidity, and velocity sensors since 2010, and added a dissolved-oxygen sensor in 2012, at a near-bottom location in Alviso Slough (Alviso, California USA). Alviso Slough is the downstream reach of the Guadalupe River and flows into the far southern end of San Francisco Bay. River flow is influenced by the Mediterranean climate, with high flows correlated to episodic winter storms (~85 m3 s-1) and low base flow during the summer (~0.85 m3 s-1). Storms and associated runoff have the greatest influence on sediment flux. Strong spring tides promote upstream sediment flux and weak neap tides have only a small net flux. During neap tides, stratification likely suppresses sediment transport during weaker flood and ebb tides.

Keywords

sediment

A Sediment Budget for the Southern Reach in San Francisco Bay, CA: Implications for habitat restoration

admin — Thu, 23 Nov 2017 00:21:53 +0000

A Sediment Budget for the Southern Reach in San Francisco Bay, CA: Implications for habitat restoration admin Wed, 11/22/2017 - 16:21

Document Category

Scientific Reports

Author(s)

Gregory G. Shellenbarger

Scott A. Wright

David H. Schoellhamer

Date

2013-05-23

Summary

As a result of regional groundwater overdrafts prior to the 1970s, parts of the South Bay Salt Pond Restoration Project project area have subsided below sea-level and will require between 29 and 45 million m3 of sediment to raise the surface of the subsided areas to elevations appropriate for tidal marsh colonization and development. Therefore, a sufficient sediment supply to the far south SFB subembayment is a critical variable for achieving restoration goals. Although both major tributaries to far south SFB have been seasonally gaged for sediment since 2004, the sediment flux at the Dumbarton Narrows, the bayward boundary of far south SFB, has not been quantified until recently. Using daily suspended-sediment flux data from the gages on Guadalupe River and Coyote Creek, combined with continuous suspended-sediment flux data at Dumbarton Narrows, we computed a sediment budget for far south SFB during Water Years 2009–2011. A Monte Carlo approach was used to quantify the uncertainty of the flux estimates. The sediment flux past Dumbarton Narrows from the north dominates the input to the subembayment. However, environmental conditions in the spring can dramatically influence the direction of springtime flux, which appears to be a dominant influence on the net annual flux. It is estimated that up to several millennia may be required for natural tributary sediments to fill the accommodation space of the subsided former salt ponds, whereas supply from the rest of the bay could fill the space in several centuries. Uncertainty in the measurement of sedimentflux is large. The results of this study reinforce the need for measurement of estuarine sediment fluxes over multiple years (multiple hydrologic conditions) to adequately detail the variability influx. Additionally, the timing of breaching events for the restoration project could be tied to annual hydrologic conditions to capitalize on increased regional sediment supply.

Keywords

habitat restoration

sediment

sediment transport

Trajectory of early tidal marsh restoration: Elevation, sedimentation and colonization of breached salt ponds in the northern San Francisco Bay

admin — Thu, 23 Nov 2017 00:21:53 +0000

Trajectory of early tidal marsh restoration: Elevation, sedimentation and colonization of breached salt ponds in the northern San Francisco Bay admin Wed, 11/22/2017 - 16:21

Document Category

Scientific Reports

Author(s)

Gregory G. Shellenbarger

David H. Schoellhamer

Renee Spenst

Date

2012-01-30

Summary

We conducted bathymetric surveys to map substrate elevations using digital elevation models and surveyed colonizing Pacific cordgrass (Spartina foliosa).

Keywords

habitat evolution

San Francisco Bay Estuary Salt Ponds Progress Report 2001 - 2003, USGS

admin — Thu, 23 Nov 2017 00:21:53 +0000

San Francisco Bay Estuary Salt Ponds Progress Report 2001 - 2003, USGS admin Wed, 11/22/2017 - 16:21

Document Category

Scientific Reports

Author(s)

A. Keith Miles

John Y. Takekawa

David H. Schoellhamer

Sarah E. Spring

Nicole D. Athearn

Gregory G. Shellenbarger

D. C. Tsao

Date

2003

Keywords

South Bay Salt Ponds Restoration Project, Short-term Data Needs, 2003-2005 Final Report

admin — Thu, 23 Nov 2017 00:21:53 +0000

South Bay Salt Ponds Restoration Project, Short-term Data Needs, 2003-2005 Final Report admin Wed, 11/22/2017 - 16:21

Document Category

Scientific Reports

Author(s)

John Y. Takekawa

A. Keith Miles

David H. Schoellhamer

Bruce E. Jaffe

Nicole D. Athearn

Sarah E. Spring

Gregory G. Shellenbarger

M.K. Saiki

Francine H. Meija

M. A. Lionberger

Date

2005

Summary

The primary goals for the short-term data needs studies were to provide baseline data for the SBSP Restoration Project and to provide a scientific basis for adaptive management decisions.

Keywords