Measured variability of acoustic propagation loss in the Salish Sea, British Columbia, Canada

2018 ◽  
Vol 144 (3) ◽  
pp. 1735-1735
Author(s):  
Caitlin O'Neill ◽  
Harald Yurk ◽  
Svein Vagle
Keyword(s):  
British Columbia ◽  
Acoustic Propagation ◽  
Propagation Loss ◽  
Salish Sea

Flow-dependent modeling of acoustic propagation based on DG-FEM method

2021 ◽  
Author(s):  
Zichen Wang ◽  
Jian Xu ◽  
Xuefeng Zhang ◽  
Can Lu ◽  
Kangkang Jin ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Transmission Loss ◽  
Acoustic Propagation ◽  
Water Area ◽  
Current Speed ◽  
Propagation Model ◽  
Propagation Loss ◽  
Two Dimensional ◽  
Underwater Sound ◽  
Ocean Environment

AbstractThis paper proposes a two-dimensional underwater sound propagation model using the Discontinuous Galerkin Finite Element Method (DG-FEM) to investigate the influence of current on sound propagation. The acoustic field is calculated by the convected wave equation with the current speed parameter. Based on the current speed data from an assimilation model, a two-dimensional coupled acoustic propagation model in the Fram Strait water area is established to observe the variability in propagation loss under different seasonal velocities in the real ocean environment. The transmission loss and signal time structure are examined. The results obtained in different source frequencies are also compared. It appears that the current velocity, time and range variation all have an effect on underwater sound propagation.

Rapid calculations of acoustic propagation loss in range dependent oceans

1996 ◽  
Vol 143 (3) ◽  
pp. 184 ◽  
Author(s):  
M.N. Packman ◽  
C.H. Harrison ◽  
M.A. Ainslie
Keyword(s):  
Acoustic Propagation ◽  
Propagation Loss

Near-Infrared Spectrometry of Stone Celts in Precontact British Columbia, Canada

2015 ◽  
Vol 80 (3) ◽  
pp. 530-547 ◽  
Author(s):  
Jesse Morin
Keyword(s):  
British Columbia ◽  
Near Infrared ◽  
Aboriginal Peoples ◽  
Infrared Spectrometry ◽  
Salish Sea ◽  
Interaction Spheres ◽  
Mineralogical Study ◽  
Infrared Spectrometer ◽  
Trade And Exchange ◽  
Near Infrared Spectrometer

Research into broad patterns of trade and exchange in precontact British Columbia, Canada, has been very limited. This paper addresses that shortcoming by presenting the results of a mineralogical study of 1,374 stone celts and 131 sawn cores from which celts were manufactured from 196 archaeological sites across British Columbia. These artifacts were an integral part of the woodworking toolkits of aboriginal peoples in this region from ca. 3500 B.P. to around contact at about 180 B.P. The mineralogy of these artifacts was determined using a portable near-infrared spectrometer, and the resulting data mapped using Geographic Information Systems. The results of this study indicate that celt production and exchange largely occurred within five discrete celt stone regions. For two of these celt stone regions—the Salish Sea and the Canadian Plateau—1 argue that these represent interaction spheres. Only in the Salish Sea were considerable numbers of celts imported from another region. For the remaining three regions, not enough data are available on the geological distribution of various celt stones or on the spatial patterns of celt production to differentiate regional interaction from individual procurement and production.

CANADA – UNITED STATES (SALISH SEA) SPILL RESPONSE ORGANIZATIONS: A COMPARISON

2014 ◽  
Vol 2014 (1) ◽  
pp. 299-313
Author(s):  
Scott Knutson ◽  
Craig Dougans ◽  
Gary Reiter ◽  
Don Rodden ◽  
Erik Kidd
Keyword(s):  
United States ◽  
British Columbia ◽  
Oil Sands ◽  
Oil Spills ◽  
The United States ◽  
Coast Guard ◽  
United States Coast Guard ◽  
Salish Sea ◽  
Common Foundation ◽  
International Border

ABSTRACT The Salish Sea comprises the inland marine waters of Washington and British Columbia and is intersected by an international border between Canada and the United States. Planning for oil spills that threaten to cross the international border is under the jurisdiction of the Canadian Coast Guard and the United States Coast Guard as described in the Canada-United States Joint Marine Contingency Plan. As Canadian companies gain approval to construct new pipelines in order to move oil sands from Alberta, Canada, to Vancouver, British Columbia, and westward, governments, agencies and citizens are publicly questioning whether current levels of oil spill preparedness and response equipment will be adequate for the increased tanker traffic from Canadian ports. This paper will be a single document that contains a snapshot of regulations, actual inventories and current philosophies that make up the 2014 response picture for the Salish Sea. It does not seek to denigrate either nation's response posture but rather to provide hard numbers as a common foundation for future discussions.

Pirates of the Salish Sea: Labor, Mobility, and Environment in the Transnational West

2006 ◽  
Vol 75 (4) ◽  
pp. 587-627 ◽  
Author(s):  
LISSA WADEWITZ
Keyword(s):  
British Columbia ◽  
Environmental History ◽  
Ethnic Differences ◽  
Labor Mobility ◽  
Human Agency ◽  
Natural World ◽  
Extractive Industries ◽  
Fraser River ◽  
Class Relations ◽  
Salish Sea

This article illustrates that a transnational perspective reveals how nature and work intertwined to shape workers' responses to evolving regional class relations in the western Canadian-U.S. borderlands. Labor and environment are intimately connected in all the West's extractive industries, and workers engaged and learned about the natural world through their labor. In the watery borderland between Washington and British Columbia, they also used the fl uidity of this border to cross the international line and enter more advantageous markets, escape authorities, and express dissatisfaction with class inequities and ethnoracial tensions. These activities earned them the epithets "bandits" and "pirates," especially from U.S. and Canadian canners who sought to manipulate ethnic differences to exploit workers more effectively. The Fraser River salmon fi shery offers a microcosm through which to assess how western labor and environmental history intersect, and what these linkages can reveal about issues of power and human agency.

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