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Filter Total Items: 1334
SedPods: a low-cost coral proxy for measuring net sedimentation
Sediment derived from impaired watersheds is a major stressor to adjacent coral reefs globally. To better understand stresses generated by specific processes and events, many coral reef scientists seek to collect physical samples of settling particles and obtain reproducible information about net rates of sediment accumulation on coral reefs. Yet, the tools most commonly used to gather this inform
Authors
Michael E. Field, Henry Chezar, Curt D. Storlazzi
Burial and exhumation of temperate bedrock reefs as elucidated by repetitive high-resolution sea floor sonar surveys: Spatial patterns and impacts to species' richness and diversity
To understand how chronic sediment burial and scour contribute to variation in the structure of algal and invertebrate communities on temperate bedrock reefs, the dynamics of the substrate and communities were monitored at locations that experience sand inundation and adjacent areas that do not. Co-located benthic scuba-transect surveys and high-resolution swath-sonar surveys were completed on bed
Authors
Curt D. Storlazzi, Theresa A. Fregoso, Jared D. Figurski, Jan Freiwald, Steve I. Lonhart, David P. Finlayson
Recent seasonal variations in arid landscape cover and aeolian sand mobility, Navajo Nation, southwestern U.S.
The socioeconomic impacts of climate change pose problems not only in devel- oping countries but also to residents of arid lands in the United States among marginalized societies with limited economic means. In the Navajo Nation, warming temperatures and recent drought have increased aeolian sediment mobility such that large, migrating sand dunes affect grazing lands, housing, and road access. Dus
Authors
Amy E. Draut, Margaret Hiza Redsteer, Lee Amoroso
Tidally influenced alongshore circulation at an inlet-adjacent shoreline
The contribution of tidal forcing to alongshore circulation inside the surfzone is investigated at a 7 km long sandy beach adjacent to a large tidal inlet. Ocean Beach in San Francisco, CA (USA) is onshore of a ∼150 km2 ebb-tidal delta and directly south of the Golden Gate, the sole entrance to San Francisco Bay. Using a coupled flow-wave numerical model, we find that the tides modulate, and in so
Authors
Jeff E. Hansen, Edwin P.L. Elias, Jeffrey H. List, Li H. Erikson, Patrick L. Barnard
Seafloor video footage and still-frame grabs from U.S. Geological Survey cruises in Hawaiian nearshore waters
Underwater video footage was collected in nearshore waters (
Authors
Ann E. Gibbs, Susan A. Cochran, Peter W. Tierney
Integration of bed characteristics, geochemical tracers, current measurements, and numerical modeling for assessing the provenance of beach sand in the San Francisco Bay Coastal System
Over 150 million m3 of sand-sized sediment has disappeared from the central region of the San Francisco Bay Coastal System during the last half century. This enormous loss may reflect numerous anthropogenic influences, such as watershed damming, bay-fill development, aggregate mining, and dredging. The reduction in Bay sediment also appears to be linked to a reduction in sediment supply and recent
Authors
Patrick L. Barnard, Amy C. Foxgrover, Edwin P.L. Elias, Li H. Erikson, James R. Hein, Mary McGann, Kira Mizell, Robert J. Rosenbauer, Peter W. Swarzenski, Renee K. Takesue, Florence L. Wong, Don Woodrow
Mw 8.6 Sumatran earthquake of 11 April 2012: rare seaward expression of oblique subduction
The magnitude 8.6 and 8.2 earthquakes off northwestern Sumatra on 11 April 2012 generated small tsunami waves that were recorded by stations around the Indian Ocean. Combining differential travel-time modeling of tsunami waves with results from back projection of seismic data reveals a complex source with a significant trench-parallel component. The oblique plate convergence indicates that ~20-50
Authors
Miaki Ishii, Eric Kiser, Eric L. Geist
Quantifying landscape change in an arctic coastal lowland using repeat airborne LiDAR
Increases in air, permafrost, and sea surface temperature, loss of sea ice, the potential for increased wave energy, and higher river discharge may all be interacting to escalate erosion of arctic coastal lowland landscapes. Here we use airborne light detection and ranging (LiDAR) data acquired in 2006 and 2010 to detect landscape change in a 100 km2 study area on the Beaufort Sea coastal plain of
Authors
Benjamin M. Jones, Jason M. Stoker, Ann E. Gibbs, Guido Grosse, Vladimir E. Romanovsky, Thomas A. Douglas, Nichole E.M. Kinsman, Bruce M. Richmond
Seafloor off Natural Bridges State Beach, Santa Cruz, California
The seafloor off Natural Bridges State Beach, Santa Cruz,
California, is extremely varied, with sandy flats, boulder fields,
faults, and complex bedrock ridges. These ridges support rich
marine ecosystems; some of them form the "reefs" that
produce world-class surf breaks. Colors indicate seafloor
depth, from red-orange (about 2 meters or 7 feet) to magenta
(25 meters or 82 feet).
Authors
Curt D. Storlazzi, Nadine E. Golden, Helen Gibbons
Dispersal of fine sediment in nearshore coastal waters
Fine sediment (silt and clay) plays an important role in the physical, ecological, and environmental conditions of coastal systems, yet little is known about the dispersal and fate of fine sediment across coastal margin settings outside of river mouths. Here I provide simple physical scaling and detailed monitoring of a beach nourishment project near Imperial Beach, California, with a high portion
Authors
Jonathan A. Warrick
Seafloor off Lighthouse Point Park, Santa Cruz, California
The seafloor off Lighthouse Point Park, Santa Cruz, California,
is extremely varied, with sandy flats, boulder fields, faults,
and complex bedrock ridges. These ridges support rich
marine ecosystems; some of them form the "reefs" that
produce world-class surf breaks. Colors indicate seafloor
depth, from red-orange (about 2 meters or 7 feet) to magenta
(25 meters or 82 feet).
Authors
Curt D. Storlazzi, Nadine E. Golden, Helen Gibbons
Photography applications
Photographic imaging is the oldest form of remote sensing used in coral reef studies. This chapter briefly explores the history of photography from the 1850s to the present, and delves into its application for coral reef research. The investigation focuses on both photographs collected from low-altitude fixed-wing and rotary aircraft, and those collected from space by astronauts. Different types o
Authors
Susan A. Cochran