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Two Articles by USGS Marine Scientists in the January 2004 Issue of the Journal of Sedimentary Research

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The January 2004 issue of the Journal of Sedimentary Research (v. 74, no. 1) contains two articles by scientists in the U.S. Geological Survey (USGS)'s Coastal and Marine Geology Program.

Dave Rubin's article, entitled "A Simple Autocorrelation Algorithm for Determining Grain Size from Digital Images of Sediment," presents a new technique for grain-size analysis that has several advantages over traditional laboratory techniques: it is 100 times as fast, it is ideal for sampling surficial sediment (the part that interacts with a flow), it can determine vertical profiles in grain size on a scale finer than can be sampled physically, and it can be used in the field to provide almost real-time grain-size analysis.

This image of Kailua Bay appears on the cover of the journal.
Kailua Bay: This image of Kailua Bay appears on the cover of the journal; here is the caption: "The reef (bluish-green tones), reef-top sands (white), and meandering paleochannel (reddish tones) at Kailua Bay, windward margin of Oahu, Hawai'i. Photo is a digital mosaic of multispectral (centered on reef) and aerial-photographic images with 1-m resolution draped on USGS DEM (10-m resolution). Multispectral bands (10 nm) are centered at 488, 551, and 577 nm. Grossman and Fletcher, this issue, demonstrate that differences in reef-accretion history and development style during Holocene time occurred as a result of differential wave exposure and its interaction with a morphologically complex antecedent substrate. Over 11 m of accretion since ca. 8,000 yr BP suggests that reef growth in Hawai'i is not necessarily limited to wave-protected settings but to settings where accommodation space existed below critical levels of wave-related stress." [larger version]

Eric Grossman's article, entitled "Holocene Reef Development Where Wave Energy Reduces Accommodation Space, Kailua Bay, Windward Oahu, Hawaii, U.S.A.," was coauthored with Chip Fletcher, a frequent USGS collaborator at the University of Hawai'i.

The authors show that, because of variation in wave exposure, Holocene reef-framework development on Oahu is largely restricted in time (8-5 ka) and space (below wave scour, about 8 to 14 m deep). Little accretion has occurred since sea level stabilized 5 ka.

Wave-related impacts (direct wave impact, bottom scour, and sediment abrasion) represent significant stresses that have pushed many reefs to their tolerance threshold. The few modern reefs that do occur on Oahu exist in a narrow window of opportunity squeezed by physical stress related to open-ocean swell and increasing threats due to human activities.

Links to abstracts of the articles are available at the Table of Contents, Journal of Sedimentary Research Volume 74(1) January 2004 Web page.

Related Sound Waves Stories
The "Poking Eyeball"—a Prototype Underwater Camera System
April 2003
USGS Patent Pending for a New Underwater Microscope System
June 2001

Related Web Sites
Coastal and Marine Geology Program
U.S. Geological Survey (USGS)
Table of Contents, Journal of Sedimentary Research Volume 74(1) January 2004
Journal of Sedimentary Research
School of Ocean and Earth Science and Technology (SOEST)
University of Hawai'i

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Mapping Hawaiian National Parks

Research USGS and Academia in Partnership

Meetings Chesapeake Bay Science

Special AGU Sessions on Gas-Hydrate Systems

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Awards Clifton to Receive Pettijohn Medal

USGS Book Wins Outstanding Publication Award

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Staff & Center News MIT Scientists Visit Woods Hole

Three New Scientists

New Postdoc in St. Petersburg

Reef Name Becomes Official

Publications New Book on the Phosphoria Formation

Two Articles in JSR

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