Results 31 to 40 of about 9,144,744 (158)

Density and Abundance of Cetaceans in the Eastern Tropical Pacific Based on a Spatial/Temporal Analysis of 1986–2006 Line‐Transect Surveys

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT The abundance of cetaceans in the eastern tropical Pacific Ocean (ETP) is estimated using spatial/temporal density modeling and conventional line‐transect approaches. Line‐transect data are analyzed from 10 ship‐based visual sighting surveys from 1986 to 2006 that include 281,000 km of survey effort in a 19.4 million km2 study area.
Jay Barlow, Lisa T. Ballance, Eric M. Keen   +2 more
wiley   +1 more source

Spatial and temporal evolution of a coastal erg margin: The Middle Jurassic Page Sandstone, southern Utah, USA

Sedimentology, Volume 73, Issue 6, Page 2081-2119, October 2026.
ABSTRACT Aeolian deflationary events are erosive to static stages where sediment supply is insufficient to support bedform migration and preservation in the rock record. In the vicinity of shallow‐marine environments, inland rises of relative water table and associated generation of deflationary super surfaces may be driven by the onset of ...
Victor J. P. Hême de Lacotte, Chester H. C. Davies, Briony J. Bowler, Stuart M. Clarke, Thomas J. H. Dodd   +4 more
wiley   +1 more source

FUNCTIONAL REQUIREMENTS FOR STABILITY OF JACK UP DRILLING RIGS ON WORKING POSITION

Rudarsko-geološko-naftni Zbornik, 2008
Jack up drilling platforms are offshore drilling units composed by drilling rig situated on naval structure without self propelling device. Jack up drilling rigs are units used for drilling and completion of deep well bores in offshore oil and gas ...
Damir Zadravec, Zdenko Krištafor
doaj  

Probabilistic Prediction of Spudcan Bearing Capacity in Stiff-over-Soft Clay Based on Bayes’ Theorem

Journal of Marine Science and Engineering
During offshore operations of jack-up platforms, the spudcan may experience sudden punch-through failure when penetrating from an overlying stiff clay layer into the underlying soft clay, posing significant risks to platform safety.
Zhaoyu Sun, Pan Gao, Yanling Gao, Jianze Bi, Qiang Gao   +4 more
doaj   +1 more source

Physical and Biogeochemical Ocean Response to Potential Offshore Wind Development Along the U.S. West Coast

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract Planning for floating offshore wind development along the U.S. west coast has prompted questions about how this new ocean use may impact marine ecosystems. Previous research suggests that offshore wind farms will alter wind dynamics and upwelling in this region, but impacts on biogeochemistry have not yet been explored.
Michael G. Jacox, Chris Chartrand, Ludivine Conte, Jerome Fiechter, Kaustubha Raghukumar, Grace Chang   +5 more
wiley   +1 more source

Effect of Foundation Modeling on Extreme Response of Offshore Jack-up Unit

, 2010
The demand for operation of mobile jack-up drilling rigs in offshore industry is increasing. Extreme response of jack-up platforms in sea environment requires improving the understanding of their nonlinear behavior.
Behrouz Asgarian, Azadeh Jafari, Mohammad Daghigh   +2 more
core   +1 more source

Spudcan bearing capacity calculation of the offshore jack-up drilling platform during the preloading process

Petroleum Exploration and Development, 2011
To predict the penetration depth of the offshore jack-up drilling platform during the preloading process, the fluid-solid coupling theory was introduced to establish the finite element model of the soil-spudcan system in saturated clay. With this model, the spudcan bearing capacity factor was numerically calculated when spudcans penetrated into ...
Puyang Zhang, Xiaoyang Yu, Hongyan Ding
openaire   +2 more sources

Characterization and Meteorological Drivers of Dust Events Over California's Central Valley

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 18, 28 September 2026.
Abstract Dust events in California's Central Valley pose severe risks to public health, regional air quality, and transportation. Yet, the climatology and meteorological drivers of dust events in the region are poorly characterized due to sparse monitoring and limitations of satellite observations.
Precious Ebiendele, Adeyemi A. Adebiyi, John T. Abatzoglou, Karin Ardon‐Dryer, Md. Minhazul Kibria, Cade Hogle   +5 more
wiley   +1 more source

Optimizing Jack-up vessel strategies for maintaining offshore wind farms [PDF]

, 2017
In this paper we present a new two-stage stochastic mathematical programming model that determines the optimal jack-up vessel strategy for an offshore wind farm.
Marielle Christiansen, Odin Kirkeby, Mikkelsen, Andreas Jebsen, Andreas Jebsen Mikkelsen, Christiansen, Marielle, Stålhane, Magnus, Magnus Stålhane, Kirkeby, Odin   +7 more
core   +1 more source

Dynamic Response Prediction Model for Jack-Up Platform Pile Legs Based on Random Forest Algorithm

Journal of Marine Science and Engineering
Jack-up offshore platforms are widely used in many fields, and it is of great importance to quickly and accurately predict the dynamic response of platform pile leg structures in real time.
Xiaohui Cui, Hui Liu, Xiang Lin, Jiahe Zou, Yu Wang, Bo Zhou   +5 more
doaj   +1 more source