The Experts below are selected from a list of 6432 Experts worldwide ranked by ideXlab platform
Peter J Talling - One of the best experts on this subject based on the ideXlab platform.
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submarine pyroclastic deposits formed during the 20th may 2006 dome collapse of the soufriere hills volcano montserrat
Bulletin of Volcanology, 2012Co-Authors: Jessica Trofimovs, Claire Foster, R S J Sparks, S C Loughlin, Le A Friant, Christine Deplus, Lucy Porritt, T Christopher, R Luckett, Peter J TallingAbstract:The 20th May 2006 lava dome collapse of the Soufriere Hills Volcano, Montserrat, had a total non-dense rock equivalent (non-DRE) collapse Volume of approximately 115 × 106 m3. The majority of this Volume was deposited into the ocean. The collapse was rapid, 85% of the mobilized Volume being removed in just 35 min, giving peak pyroclastic flow flux of 66 × 103 m3 s−1. Channel and levee facies on the submarine flanks of the volcano and formation of a thick, steep-sided ridge, suggest that the largest and most dense blocks were transported proximally as a high concentration granular flow. Of the Submerged Volume, 30% was deposited from the base of this granular flow, forming a linear, high-relief ridge that extends 7 km from shore. The remaining 70% of the Submerged Volume comprises the finer grain sizes, which were transported at least 40 km by turbidity currents on gradients of <2°. At several localities, the May 2006 distal turbidity currents ran up 200 m of topography and eroded up to 20 cm of underlying substrate. Multiple turbidites are preserved, representing current reflection from the graben margins and deflection around topography. The high energy of the May 2006 collapse resulted in longer submarine run out than the larger (210 × 106 m3) Soufriere Hills dome collapse in July 2003.
Wayne Gramlich - One of the best experts on this subject based on the ideXlab platform.
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feasibility and design of the clubstead a cable stayed floating structure for offshore dwellings
ASME 2010 29th International Conference on Ocean Offshore and Arctic Engineering, 2010Co-Authors: Alexia Aubault, Wendy Sitlerroddier, Dominique Roddier, Patri Friedman, Wayne GramlichAbstract:The ClubStead is a novel type of offshore floating platform, which provides comfortable and safe ocean-going dwellings for communities of a few hundred people. The prospect of large, unclaimed ocean spaces has encouraged people to consider developing sea-going settlements. A number of attempts have been made on former oil platforms or cruise ships. But these structures are not designed for permanent living at sea and fall short of meeting dwellers’ expectations. Efforts to build large, spacious floating living facilities have struggled to balance cost-effectiveness and structural integrity. This paper describes an innovative, cost-efficient solution to maximize space on offshore structures. To control the cost, the Submerged Volume of the floater is minimized. To maximize comfort, the available living surface area is also maximized, while the motions of the platform are limited. The proposed solution is based on the principles of tensegrity, which are commonly used on bridges. Cable stays are tensioned at the top of towers to support the weight of both light and cantilevered top-sides. The floater is column-stabilized with four Submerged columns. A feasibility study was performed for the design of a Clubstead based off the coast of California. The platform is dynamically positioned and can house up to 270 people. Due to its primary function, as a floating living facility, the architectural design and the engineering studies are intertwined. Iterations are necessary to determine the global characteristics of the ClubStead. The buildings and living spaces are arranged by an architect, within specific offshore-related constraints. The resulting payload is calculated and thus used in the design basis to perform the engineering analysis. The feasibility study focuses on survivability and passenger comfort to assess the novel design. The survivability analysis is based on structural strength and motion predictions in a 100-year storm. Passenger comfort is evaluated in operational conditions.Copyright © 2010 by ASME
Jessica Trofimovs - One of the best experts on this subject based on the ideXlab platform.
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submarine pyroclastic deposits formed during the 20th may 2006 dome collapse of the soufriere hills volcano montserrat
Bulletin of Volcanology, 2012Co-Authors: Jessica Trofimovs, Claire Foster, R S J Sparks, S C Loughlin, Le A Friant, Christine Deplus, Lucy Porritt, T Christopher, R Luckett, Peter J TallingAbstract:The 20th May 2006 lava dome collapse of the Soufriere Hills Volcano, Montserrat, had a total non-dense rock equivalent (non-DRE) collapse Volume of approximately 115 × 106 m3. The majority of this Volume was deposited into the ocean. The collapse was rapid, 85% of the mobilized Volume being removed in just 35 min, giving peak pyroclastic flow flux of 66 × 103 m3 s−1. Channel and levee facies on the submarine flanks of the volcano and formation of a thick, steep-sided ridge, suggest that the largest and most dense blocks were transported proximally as a high concentration granular flow. Of the Submerged Volume, 30% was deposited from the base of this granular flow, forming a linear, high-relief ridge that extends 7 km from shore. The remaining 70% of the Submerged Volume comprises the finer grain sizes, which were transported at least 40 km by turbidity currents on gradients of <2°. At several localities, the May 2006 distal turbidity currents ran up 200 m of topography and eroded up to 20 cm of underlying substrate. Multiple turbidites are preserved, representing current reflection from the graben margins and deflection around topography. The high energy of the May 2006 collapse resulted in longer submarine run out than the larger (210 × 106 m3) Soufriere Hills dome collapse in July 2003.
Alexia Aubault - One of the best experts on this subject based on the ideXlab platform.
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feasibility and design of the clubstead a cable stayed floating structure for offshore dwellings
ASME 2010 29th International Conference on Ocean Offshore and Arctic Engineering, 2010Co-Authors: Alexia Aubault, Wendy Sitlerroddier, Dominique Roddier, Patri Friedman, Wayne GramlichAbstract:The ClubStead is a novel type of offshore floating platform, which provides comfortable and safe ocean-going dwellings for communities of a few hundred people. The prospect of large, unclaimed ocean spaces has encouraged people to consider developing sea-going settlements. A number of attempts have been made on former oil platforms or cruise ships. But these structures are not designed for permanent living at sea and fall short of meeting dwellers’ expectations. Efforts to build large, spacious floating living facilities have struggled to balance cost-effectiveness and structural integrity. This paper describes an innovative, cost-efficient solution to maximize space on offshore structures. To control the cost, the Submerged Volume of the floater is minimized. To maximize comfort, the available living surface area is also maximized, while the motions of the platform are limited. The proposed solution is based on the principles of tensegrity, which are commonly used on bridges. Cable stays are tensioned at the top of towers to support the weight of both light and cantilevered top-sides. The floater is column-stabilized with four Submerged columns. A feasibility study was performed for the design of a Clubstead based off the coast of California. The platform is dynamically positioned and can house up to 270 people. Due to its primary function, as a floating living facility, the architectural design and the engineering studies are intertwined. Iterations are necessary to determine the global characteristics of the ClubStead. The buildings and living spaces are arranged by an architect, within specific offshore-related constraints. The resulting payload is calculated and thus used in the design basis to perform the engineering analysis. The feasibility study focuses on survivability and passenger comfort to assess the novel design. The survivability analysis is based on structural strength and motion predictions in a 100-year storm. Passenger comfort is evaluated in operational conditions.Copyright © 2010 by ASME
Antonio Sarmento - One of the best experts on this subject based on the ideXlab platform.
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force reacting principle applied to a heave point absorber wave energy converter
The Nineteenth International Offshore and Polar Engineering Conference, 2009Co-Authors: Thomas Soulard, Marco A Z Alves, Antonio SarmentoAbstract:The present paper reports a numerical study concerning the modeling and geometric optimization of a two body heave oscillating point absorber wave energy converter (WEC) using the force reacting principle. The device work principle is based on a surface body (or floater) force-reacting against a Submerged body, as the excitation force of both, the floater and the Submerged body, are in phase opposition. The relative motion between the two bodies generates electrical power through a linear power take off system (PTO). From the hydrodynamic point of view, the main purpose of the concept is to emphasize the radiation capabilities of the body placed under the free surface, as it has both excitation force components (diffraction and Froude Krylov) in phase. Therefore, the excitation force (and thus the hydrodynamic damping coefficient) is higher in the case of a Submerged Volume variation heave oscillating body (like the AWS wave energy converter) when compared to a floating buoy with the same area, and depth, of the active surface (surface responsible for the device radiation capabilities). The paper investigates the possibility of taking advantage of this effect on the device geometry optimization. The methodology is described in this paper as far as hydrodynamics and computation are concerned. First a geometrical optimization is carried out, aiming at finding a shape adapted to predefined wave climate conditions. Then, an absorbed power improvement method based on the regulation of the PTO is detailed. Most of the observations derivate from frequency domain however a time domain simulator had been created too, in order to double check the results.
