scholarly journals LONG TERM EXPERIENCE WITH SEAWALLS ON AN EXPOSED COAST

1988 ◽  
Vol 1 (21) ◽  
pp. 182
Author(s):  
Orville T. Magoon ◽  
Joan L. Pope ◽  
Robert L. Sloan ◽  
Donald D. Treadwell
Keyword(s):  
Pacific Ocean ◽  
Effective Means ◽  
Cost Effective ◽  
Design Parameters ◽  
Clear Understanding ◽  
Santa Cruz ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Long Term Experience

Appropriately designed, constructed, and maintained rubble mound seawalls are an efficient and cost-effective means of protecting erodible sections of exposed coastline. This conclusion is supported by more than 25 years of satisfactory seawall performance along the Pacific Ocean coast of Santa Cruz County, California, U.S.A. Important factors in satisfactory seawall performance include a clear understanding of the oceanographic and geologic design parameters, a vigorous inspection program during construction, and continued observation and maintenance of the structures.

scholarly journals Long-term ocean acidification trends in coastal waters around Japan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroshi Ishida ◽  
Ryosuke S. Isono ◽  
Jun Kita ◽  
Yutaka W. Watanabe
Keyword(s):  
Pacific Ocean ◽  
Ocean Acidification ◽  
Sea Of Japan ◽  
Ocean Current ◽  
The Sea Of Japan ◽  
Marginal Seas ◽  
The Pacific ◽  
Activity Measurements ◽  
The Pacific Ocean

AbstractThis study examines long-term ocean pH data to evaluate ocean acidification (OA) trends at two coastal research institutions located on the Sea of Japan and the Pacific Ocean. These laboratories are located away from the influences of large rivers and major industrial activity. Measurements were performed daily for the past 30 years (1980s–2010s). The average annual ocean pH for both sites showed generally negative trends. These trends were – 0.0032 and – 0.0068 year–1 (p < 0.001) at the Sea of Japan and Pacific Ocean sites, respectively. The trends were superimposed onto approximately 10-year oscillations, which appear to synchronize with the ocean current periodicity. At the Sea of Japan site, the ocean pH in the summer was higher, and the rate of OA was higher than during other seasons. Our results suggest that seasonality and ocean currents influence OA in the coastal areas of open oceans and can affect the coastal regions of marginal seas.

scholarly journals Pacific Sea Levels Rising Very Slowly and Not Accelerating

2019 ◽  
Vol 38 (1) ◽  
pp. 179-184 ◽  
Author(s):  
Albert Parker ◽  
Clifford Ollier
Keyword(s):  
Pacific Ocean ◽  
Sea Level ◽  
Relative Rate ◽  
Tide Gauges ◽  
Sea Levels ◽  
The Past ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Long Term Trend

AbstractOver the past decades, detailed surveys of the Pacific Ocean atoll islands show no sign of drowning because of accelerated sea-level rise. Data reveal that no atoll lost land area, 88.6% of islands were either stable or increased in area, and only 11.4% of islands contracted. The Pacific Atolls are not being inundated because the sea level is rising much less than was thought. The average relative rate of rise and acceleration of the 29 long-term-trend (LTT) tide gauges of Japan, Oceania and West Coast of North America, are both negative, −0.02139 mm yr−1and −0.00007 mm yr−2respectively. Since the start of the 1900s, the sea levels of the Pacific Ocean have been remarkably stable.

Thermal limits and ocean migrations of sockeye salmon (Oncorhynchus nerka): long-term consequences of global warming

1998 ◽  
Vol 55 (4) ◽  
pp. 937-948 ◽  
Author(s):  
D W Welch ◽  
Y Ishida ◽  
K Nagasawa
Keyword(s):  
Pacific Ocean ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Step Function ◽  
Thermal Limits ◽  
The North ◽  
The Pacific ◽  
Different Temperatures ◽  
The Pacific Ocean

Ocean surveys show that extremely sharp thermal boundaries have limited the distribution of sockeye salmon (Oncorhynchus nerka) in the Pacific Ocean and adjacent seas over the past 40 years. These limits are expressed as a step function, with the temperature defining the position of the thermal limit varying between months in an annual cycle. The sharpness of the edge, the different temperatures that define the position of the edge in different months of the year, and the subtle variations in temperature with area or decade for a given month probably all occur because temperature-dependent metabolic rates exceed energy intake from feeding over large regions of otherwise acceptable habitat in the North Pacific. At current rates of greenhouse gas emissions, predicted temperature increases under a doubled CO2 climate are large enough to shift the position of the thermal limits into the Bering Sea by the middle of the next century. Such an increase would potentially exclude sockeye salmon from the entire Pacific Ocean and severely restrict the overall area of the marine environment that would support growth.

Nature in the Land of Fur

2017 ◽  
Author(s):  
Jonathan Schlesinger
Keyword(s):  
Pacific Ocean ◽  
Environmental Crisis ◽  
Boundary Line ◽  
Altai Mountains ◽  
The Pacific ◽  
Late Eighteenth ◽  
The Pacific Ocean ◽  
Local Nature

In the borderland with Russia, a similar crisis emerged with furs: From the Altai Mountains to the Pacific Ocean, sables, then foxes, then squirrels vanished from the forest. In response, the Qing state again mobilized itself for another “purification” campaign: it repatriated trespassers, reinforced the boundary line around hunting zones, and attempted to ensure the long-term sustainability of fur-bearing animals. The chapter documents the interconnections between local, regional, and global fur trades in the late eighteenth and early nineteenth centuries and provides a case study of the environmental crisis in Tannu Uriankhai lands, in modern Tannu Tuva. There too, the archives show, the Qing court attempted to “purify” local nature and remake it as pristine.

scholarly journals Long-Term Change in COD in the Open Waters of the Pacific Ocean near Japan, and its Effect on COD in the Seto Inland Sea

2017 ◽  
Vol 40 (5) ◽  
pp. 189-197
Author(s):  
Yoshinori YABUKI ◽  
Junko ONO ◽  
Nobuyuki AIKO ◽  
Masaki NAKAJIMA ◽  
Sae TANAKA ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Seto Inland Sea ◽  
Term Change ◽  
The Pacific ◽  
The Seto Inland Sea ◽  
The Pacific Ocean

Late Cretaceous-early Tertiary gastropods from southwestern Patagonia, Argentina

1994 ◽  
Vol 68 (2) ◽  
pp. 257-274 ◽  
Author(s):  
Miguel Griffin ◽  
Mario A. Hünicken
Keyword(s):  
New Zealand ◽  
Pacific Ocean ◽  
Late Cretaceous ◽  
Shallow Sea ◽  
Santa Cruz ◽  
Continuous Sequence ◽  
Early Tertiary ◽  
The Pacific ◽  
Molluscan Fauna ◽  
The Pacific Ocean

The continuous sequence of Maastrichtian to Paleocene sediments exposed in the Sierra Dorotea area in southwestern Santa Cruz (Argentina) contains a rich molluscan fauna with many elements characteristic of the Weddellian Faunistic Province. The presence in this fauna of genera such as Taioma, Heteroterma, Fyfea, Zemacies, and Priscaphander suggests close affinities with faunas of similar age from New Zealand, further supporting the existence of continuous shallow-sea conditions along the southern margin of the Pacific Ocean during the end of the Cretaceous and beginning of the Tertiary. In this paper 25 species are described, of which six are new: Pseudofax costellatus n. sp., Taioma patagonica n. sp., Heteroterma elegans n. sp., Fyfea beui n. sp., Priscaphander sanjosensis n. sp., and Priscaphander bracaccinii n. sp.

scholarly journals APPLICABILITY OF A LONG-TERM WAVE HINDCAST SYSTEM COMPOSED OF MSM-BASED WIND DATA SETS AND BACKWARD RAY TRACING WAVE MODEL TO THE PACIFIC OCEAN COASTS OF JAPAN

2017 ◽  
Vol 73 (2) ◽  
pp. I_785-I_790
Author(s):  
Hirokazu NONAKA ◽  
Masataka YAMAGUCHI ◽  
Yoshio HATADA ◽  
Kunimitsu INOUCHI ◽  
Yoshihiro UTSUNOMIYA ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Ray Tracing ◽  
Wave Model ◽  
Wind Data ◽  
Data Sets ◽  
Wave Hindcast ◽  
The Pacific ◽  
The Pacific Ocean
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