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Filter Total Items: 612
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Year Published: 2006

Climate scenarios for California

Possible future climate changes in California are investigated from a varied set of climate change model simulations. These simulations, conducted by three state-of-the-art global climate models, provide trajectories from three greenhouse gas (GHG) emission scenarios. These scenarios and the resulting climate simulations are not “predictions...

Cayan, Daniel R.; Maurer, Ed; Dettinger, Mike; Tyree, Mary; Hayhoe, Katharine; Bonfils, Celine; Duffy, Phil; Santer, Ben

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Year Published: 2006

Projecting future sea level

California’s coastal observations and global model projections indicate that California’s open coast and estuaries will experience increasing sea levels over the next century. Sea level rise has affected much of the coast of California, including the Southern California coast, the Central California open coast, and the San Francisco...

Cayan, Daniel R.; Bromirski, Peter; Hayhoe, Katharine; Tyree, Mary; Dettinger, Mike; Flick, Reinhard

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Year Published: 2006

Summary of Suspended-Sediment Concentration Data, San Francisco Bay, California, Water Year 2004

Buchanan, Paul A.; Lionberger, Megan A.
Summary of Suspended-Sediment Concentration Data, San Francisco Bay, California, Water Year 2004; 2006; DS; 226; Buchanan, Paul A.; Lionberger, Megan A.

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Year Published: 2006

Sediment deposition and erosion in south San Francisco Bay, California from 1956 to 2005

Sediment deposition and erosion in South San Francisco Bay from 1956 to 2005 was studied by comparing bathymetric surveys made in 1956, 1983, and 2005. From 1956 to 1983, the region was erosional. In contrast, from 1983 to 2005, the region was depositional. Analysis of subregions defined by depth, morphology and location revealed similarities in...

Jaffe, Bruce; Foxgrover, Amy C.
Sediment deposition and erosion in south San Francisco Bay, California from 1956 to 2005; 2006; OFR; 2006-1287; Jaffe, Bruce; Foxgrover, Amy

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Year Published: 2006

A history of intertidal flat area in south San Francisco Bay, California: 1858 to 2005

A key question in salt pond restoration in South San Francisco Bay is whether sediment sinks created by opening ponds will result in the loss of intertidal flats. Analyses of a series of bathymetric surveys of South San Francisco Bay made from 1858 to 2005 reveal changes in intertidal flat area in both space and time that can be used to better...

Jaffe, Bruce; Foxgrover, Amy C.
A history of intertidal flat area in south San Francisco Bay, California: 1858 to 2005; 2006; OFR; 2006-1262; Jaffe, Bruce; Foxgrover, Amy

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Year Published: 2006

Near-field receiving water monitoring of trace metals and a benthic community near the Palo Alto regional water quality control plant in south San Francisco Bay, California: 2005

Trace elements in sediment and the clam Macoma petalum (formerly reported as Macoma balthica (Cohen and Carlton 1995), clam reproductive activity and benthic, macroinvertebrate community structure are reported for a mudflat one kilometer south of the discharge of the Palo Alto Regional Water Quality Control Plant in South San Francisco Bay. This...

Cain, Daniel J.; Parcheso, Francis; Thompson, Janet K.; Luoma, Samuel N.; Lorenzi, Allison H.; Moon, Edward; Shouse, Michelle K.; Hornberger, Michelle I.; Dyke, Jessica
Near-field receiving water monitoring of trace metals and a benthic community near the Palo Alto regional water quality control plant in south San Francisco Bay, California: 2005; 2006; OFR; 2006-1152; Cain, Daniel J.; Parchaso, Francis; Thompson, Janet K.; Luoma, Samuel N.; Lorenzi, Allison H.; Moon, Edward; Shouse, Michelle K.; Hornberger, Michelle I.; Dyke, Jessica L.

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Year Published: 2006

A tool for assessing mercury loadings from restored tidal systems

Accurately quantifying net loads in tidal systems is difficult owing to the high variability in constituent concentrations over the vastly different time scales present in these systems. Perhaps most difficult is the measurement of fluxed over the tidal time scale. On this scale, the net export of the constituent is orders of magnitude less than...

Fleck, J.A.; Bergamaschi, B.A.; Downing, B.D.; Lionberger, M.A.; Schoellhamer, D.H.; Boss, E.; Stephenson, M.

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Year Published: 2006

Sediment supply and demand for salt pond restoration

Trulio, Lynne; Schoellhamer, David H.; Orlando, James L.; Wright, Scott A.; Freeman, Larry A.

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Year Published: 2006

Eutrophication of freshwater and marine ecosystems

Initial understanding of the links between nutrients and aquatic productivity originated in Europe in the early 1900s, and our knowledge base has expanded greatly during the past 40 yr. This explosion of eutrophication-related research has made it unequivocally clear that a comprehensive strategy to prevent excessive amounts of nitrogen and...

Smith, Val H.; Joye, Samantha B.; Howarth, Robert W.

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Year Published: 2006

A component-resampling approach for estimating probability distributions from small forecast ensembles

In many meteorological and climatological modeling applications, the availability of ensembles of predictions containing very large numbers of members would substantially ease statistical analyses and validations. This study describes and demonstrates an objective approach for generating large ensembles of "additional" realizations from smaller...

Dettinger, M.
A component-resampling approach for estimating probability distributions from small forecast ensembles; 2006; Article; Journal; Climatic Change; Dettinger, M.

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Year Published: 2006

Degradation of water quality by bird feces in and around managed wetlands

No abstract available.

Shellenbarger, G.G.; Boehm, A.B.

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Year Published: 2006

Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems

A presumed value of shallow-habitat enhanced pelagic productivity derives from the principle that in nutrient-rich aquatic systems phytoplankton growth rate is controlled by light availability, which varies inversely with habitat depth. We measured a set of biological indicators across the gradient of habitat depth within the Sacramento–San...

Lopez, C.B.; Cloern, J.E.; Schraga, T.S.; Little, A.J.; Lucas, L.V.; Thompson, J.K.; Burau, J.R.
Ecological values of shallow-water habitats: Implications for the restoration of disturbed ecosystems; 2006; Article; Journal; Ecosystems; Lopez, C. B.; Cloern, J. E.; Schraga, T. S.; Little, A. J.; Lucas, L. V.; Thompson, J. K.; Burau, J. R.

Filter Total Items: 223
Image in mostly black and white tones, showing distant view of beach stretching from bottom left to upper right.
May 6, 2017

Variance image from video of beach in Santa Cruz, California

“Variance” image produced from video shot at Cowells Beach in Santa Cruz, California, on May 6, 2017. The more the light intensity changes at a given spot, or “pixel,” during the video, the brighter the value assigned to that pixel. Motion tends to produce changes in light intensity. Note bright areas along and beyond the shore where waves were breaking. Researchers are

...
A cabin along Alaska's Arctic coast was recently washed into the ocean because the bluff it was sitting on eroded away.
May 3, 2017

Climate Change Impacts

From the Sound Waves Newletter article, "Erosion Doubles Along Part of Alaska's Arctic Coast — Cultural and Historical Sites Lost" at http://soundwaves.usgs.gov/2009/05/research2.html

March 31, 2017

Establishing Forster's Tern Nesting Colonies

Scientists from the USGS Western Ecological Research Center (WERC) are conducting a "social attraction" study for seabirds in the Don Edwards San Francisco Bay National Wildlife Refuge. Historically, this region offered wetland habitats to local wildlife. With the introduction of industrial salt ponds and human development, however, much of this habitat was lost. Now,

...
Photo of shoreline with very little sandy beach. Heavy equipment is  piling up large boulders (rip rap) along the eroded shore
February 28, 2017

Armoring the shore at Goleta Beach

Installing large boulders as rip rap to armor the shore against further erosion at Goleta Beach in Southern California. The tide is very low (negative).

photo of bare rocks exposed below cliffs at low tide along a shoreline.
February 28, 2017

Exposed bedrock at low tide

Exposed bedrock on the beach, below the University of California, Santa Barbara.

row of palm trees along a low cliff behind a narrow beach with very little sand
February 28, 2017

Beach loss and armoring at Goleta Beach

Beach loss and armoring at Goleta Beach, very low (negative) tide

long stretch of beach, with row of houses teetering on the edge of the cliff above beach. Bare rocks exposed & no sand on beach
February 28, 2017

Exposed bedrock at Isla Vista beach

Bedrock exposed at low tide along the beach at Isla Vista, California

house perched at the top of cliff edge above beach.
February 28, 2017

Exposed bedrock at Isla Vista

Exposed bedrock on the beach during very low (negative) tide at Isla Vista, California

Large ruler-like instrument under a bridge standing up in the river water
February 11, 2017

USGS staff gage measuring the height of the water in the Carson River

USGS staff gage (ruler) measuring the height of the water, on the Carson River, near Brunswick Canyon, Nevada.

person sitting on the shore, watch a floating instrument tied to a cableway over a river
February 8, 2017

Streamgaging on Martin Creek in Nevada

Streamgaging on Martin Creek, near Paradise Valley, Nevada.

two men standing in a boat tied up to a dock
January 31, 2017

Readying a sonar-equipped boat for mapping

USGS scientists readying a sonar-equipped boat to map the ocean bottom near Santa Cruz, Calif.

person standing up riding a personal watercraft across small ocean swells, with buildings and a long pier in the background
January 31, 2017

Sonar-equipped personal watercraft mapping bathymetry.

A sonar-equipped personal watercraft mapping the bathymetry underwater near Santa Cruz, Calif.

Research and technical support provided by USGS makes a difference Some recent press releases and media advisories from the Pacific Region are highlighted below.

Filter Total Items: 60
Man in orange safety suit and helmet, and thumb up,  standing while riding a personal watercraft
January 12, 2017

On January 13, scientists from the U.S. Geological Survey will be working on the beach in Santa Cruz at the mouth of the San Lorenzo River. Using a sonar-equipped boat and personal watercraft, they will be surveying the beach and the nearby ocean bottom to compile a three-dimensional map of how the beach changed during storms that struck this week.

USGS: Science for a changing world
January 10, 2017

The U.S. Geological Survey’s California Water Science Center is hosting a media event Wednesday, Jan. 11 at a USGS streamgage location about 7 miles north of Santa Cruz, California. A hydrologist will be available for interviews as field crews collect streamflow data.

 

Image: USGS Logo
January 8, 2017

The U.S. Geological Survey’s California Water Science Center is hosting a media event Monday, Jan. 9 at a USGS streamgage location below Friant Dam, a streamflow site with significance to the San Juan River Restoration Project.

still waters reflecting image of grasses growing next to it, with bright blue sky.
November 15, 2016

Successfully resolving California’s long-standing water supply and ecosystem restoration conflicts in the Delta requires developing sound policy solutions based on data derived from the best available science.

still waters reflecting image of grasses growing next to it, with bright blue sky.
November 9, 2016

Scientists, engineers and resource managers meet in Sacramento to explore the theme of “Science for Solutions: Linking Data and Decisions” at the 9th Biennial Bay-Delta Science Conference.

USGS
November 1, 2016

A new study from the USGS suggests that some early 20th century earthquakes in southern California might have been induced (man-made) by past practices that were used by the oil and gas industry.

Two side-by-side (before, 2002 & after) aerial photos of the same cliff by the beach. Photo on right from 2010 shows landslide.
October 21, 2016

U.S. Geological Survey scientists and their coauthors from the California Coastal Records Project have found a way to use historical aerial photographs not just to see evidence of coastal erosion, but to accurately measure how much has occurred over time.

USGS
October 17, 2016

A new study offers the most sophisticated analyses to date on how Los Angeles-area groundwater supplies are replenished. The analyses provide water managers with a clearer understanding of the sources and amount of available groundwater in the region – information that is important for planning and management of the vital resource.

Image shows sagebrush lands with cloudy sky
October 4, 2016

At the request of the Bureau of Land Management, USGS has released an assessment of mineral resources in six Western states.

Golden Eagle in flight
September 28, 2016

Roughly over a quarter of the golden eagles killed at the Altamont Pass Wind Resource Area in Northern California from 2012-2014 were recent immigrants to the local population, according to research led by the U.S. Geological Survey. 

Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.

The Pacific Region works with a wide array of partners across the country, including other Federal and state agencies, regional and local governments, academic institutions, research organizations, non-governmental organizations, and more.

Filter Total Items: 76