Centrifuge tests for evaluation of submarine-mudflow hydroplaning and turbidity currents

Hotta, Marcelo Muta; Almeida, Maria Amélia; Pelissaro, Deise Trevizan; Oliveira, Jauvane C. de; Tibana, Sérgio; Borges, Ricardo Garske

doi:10.1680/jphmg.18.00081

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…Submarine landslides can be considered a principal geohazard in marine settings (Gamboa et al, 2021), varying from large-scale landslides (Talling et al, 2014;Day et al, 2015) to minor instabilities (L´Heureux et al, 2012;Scarselli, 2020). Many submarine landslides can be characterized by substantial mass movement over extended run-out distances on very gentle slopes (Talling et al, 2014;Hotta et al, 2019). Evaluation of the geological-geotechnical processes that lead to hazardous conditions, particularly seismic-induced landslides, is a necessary element of risk assessment in offshore oil, gas or renewable energy projects (Borges et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

Camelo

Almeida

et al. 2022

J. Geotech. Geoenviron. Eng.

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This paper presents the experimental results and analysis from two centrifuge experiments that simulated the seismic response of a gentle slope in soft clay. The two models consisted of a three-degree and a six-degree slope in soft clay, respectively, which are representative of typical slopes found on marine seabeds on the continental margins. The models were built in a laminar container in order to reproduce infinite slope boundary conditions. In-flight characterization investigations consisting of T-bar tests and air hammer tests were performed to obtain undrained shear strength profiles and shear wave velocities at various depths, respectively. A suite of earthquakes was

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Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

Camelo

Almeida

et al. 2022

J. Geotech. Geoenviron. Eng.

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“…Os estudos aqui apresentados têm por objetivo prover parâmetros geotécnicos para os experimentos que têm sido realizados na modelagem física da instabilidade de taludes submarinos (TARAZONA et al, 2019HOTTA et al, 2019 no Laboratório Multiusuário de Modelagem Física LM 2 C (http://lm2c.coc.ufrj.br/).…”

Section: Introductionunclassified

Ensaios de Coluna Ressonante em Caulim Speswhite

Fernandes¹,

Almeida²,

Almeida³

et al. 2020

Congresso Brasileiro De Mecânica Dos Solos E Engenharia Geotécnica

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A obtenção dos parâmetros dinâmicos do caulim faz parte de um projeto realizado pelo CENPES-PETROBRAS em cooperação com a COPPE-UFRJ visando o estudo da influência de carregamentos sísmicos na instabilidade de taludes submarinos, que ocorrem em diversas margens continentais do Brasil e do mundo. Os taludes submarinos localizam-se principalmente nas margens das plataformas continentais possuindo em geral baixas declividades, com inclinações entre 1 e 8 graus, sendo em sua maioria em torno de 5 graus. Sismos, mesmo de baixas intensidades, têm sido reconhecidamente identificados como ameaça potencial na instabilisação de taludes submarinos. Tais deslizamentos, envolvem grandes volumes de massa que atingem altas velocidades representando elevados riscos às estruturas e instalações offshore. O principal objetivo deste trabalho é a caracterização das propriedades dinâmicas do caulim Speswhite através de ensaios de coluna ressonante, visando a obtenção de curvas características de degradação do módulo cisalhante (G/Gmáx) e da razão de amortecimento (D).

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Evolution of high-density submarine turbidity current and its interaction with a pair of parallel suspended pipes

Guo,

Luo,

Stoesser

et al. 2023

Physics of Fluids

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The method of large-eddy simulation (LES) coupled with the density transport equation is employed to simulate the evolution of a gravity-driven high-density turbidity current and its interaction with a pair of parallel suspended pipes. The LES method is validated first using data of a non-Boussinesq lock-exchange experiment and satisfying agreement between LES and experiment is achieved. The simulations reveal that a shear region forms between high- and low-density fluids each moving in opposite directions which lead to the generation of a series of vortices and a substantial mixing region. Close to the bottom boundary, low-density fluid is entrained near the head of the high-density turbidity current, forming a thin water cushion that separates the turbidity current's head from the seabed, the so-called hydroplaning effect, thereby reducing the density of the head and bottom friction. The current study suggests that the effect of hydroplaning phenomena leads to high speed and long distance of the turbidity current. Further, LES simulations of a turbidity current impacting a pair of parallel suspended pipes with different streamwise spacings are performed and impact forces are quantified. The turbulent wake generated by high-density fluid bypassing pipe 1 promotes velocity fluctuations leading to increased impact forces on pipe 2 with increasing streamwise spacing up to 8 times the pipeline diameter (8D). The results suggest that the streamwise spacing between two parallel pipes should be less than 2D to minimize hydrodynamic loads on pipe 2.

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Centrifuge tests for evaluation of submarine-mudflow hydroplaning and turbidity currents

Cited by 6 publications

References 34 publications

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

Centrifuge Modeling of the Seismic Behavior of Soft Clay Slopes

Ensaios de Coluna Ressonante em Caulim Speswhite

Evolution of high-density submarine turbidity current and its interaction with a pair of parallel suspended pipes

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