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Two Articles by USGS Marine Scientists in the January 2004 Issue of the Journal of Sedimentary Research
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.
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.
in this issue:
Two Articles in JSR
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