Quantifying fishing activity targeting subsea pipelines by commercial trap fishers

2021 ◽  
Author(s):  
Todd Bond ◽  
Dianne L. McLean ◽  
Corey B. Wakefield ◽  
Julian C. Partridge ◽  
Jane Prince ◽  
...  
Keyword(s):  
Fishing Activity ◽  
Subsea Pipelines

Evaluating Corrosion Inhibitors For Sour Gas Subsea Pipelines

2009 ◽  
Author(s):  
Hejian Sun ◽  
David J. Blumer ◽  
Mike Swidzinski ◽  
Josh Davis
Keyword(s):  
Corrosion Inhibitors ◽  
Subsea Pipelines ◽  
Sour Gas

Comprehensive method to determine flow areas of perforation damages in subsea pipelines with culverts

2019 ◽  
Vol 9 (6) ◽  
pp. 660-665
Author(s):  
Elmir I. Huseynli ◽  
◽  
Ramiz A. Eminov ◽  
Arzu E. Ibrahimova ◽  
◽  
...  
Keyword(s):  
Comprehensive Method ◽  
Subsea Pipelines

2D and 3D CFD Investigations of Seabed Shear Stresses Around Subsea Pipelines

2013 ◽  
Author(s):  
Wenwen Shen ◽  
Terry Griffiths ◽  
Mengmeng Xu ◽  
Jeremy Leggoe
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Interaction Model ◽  
Suspended Sediment Transport ◽  
Shear Stresses ◽  
Parametric Function ◽  
Ample Evidence ◽  
North West ◽  
Wide Range ◽  
Subsea Pipelines

For well over a decade it has been widely recognised that existing models and tools for subsea pipeline stability design fail to account for the fact that seabed soils tend to become mobile well before the onset of pipeline instability. Despite ample evidence obtained from both laboratory and field observations that sediment mobility has a key role to play in understanding pipeline/soil interaction, no models have been presented previously which account for the tripartite interaction between the fluid and the pipe, the fluid and the soil, and the pipe and the soil. There are numerous well developed and widely used theories available to model pipe-fluid and pipe-soil interactions. A challenge lies in the way to develop a satisfactory fluid-soil interaction algorithm that has the potential for broad implementation under both ambient and extreme sea conditions due to the complexity of flow in the vicinity of a seabed pipeline or cable. A widely used relationship by Shields [1] links the bedload and suspended sediment transport to the seabed shear stresses. This paper presents details of computational fluid dynamics (CFD) research which has been undertaken to investigate the variation of seabed shear stresses around subsea pipelines as a parametric function of pipeline spanning/embedment, trench configuration and wave/current properties using the commercial RANS-based software ANSYS Fluent. The modelling work has been undertaken for a wide range of seabed geometries, including cases in 3D to evaluate the effects of finite span length, span depth and flow attack angle on shear stresses. These seabed shear stresses have been analysed and used as the basis for predicting sediment transport within the Pipe-Soil-Fluid (PSF) Interaction Model [2] in determining the suspended sediment concentration and the advection velocity in the vicinity of pipelines. The model has significant potential to be of use to operators who struggle with conventional stabilisation techniques for the pipelines, such as those which cross Australia’s North West Shelf, where shallow water depths, highly variable calcareous soils and extreme metocean conditions driven by frequent tropical cyclones result in the requirement for expensive and logistically challenging secondary stabilisation measures.

On the effect of long corrosion defect and axial tension on the burst pressure of subsea pipelines

2021 ◽  
Vol 111 ◽  
pp. 102637
Author(s):  
Zhan-Feng Chen ◽  
Wen Wang ◽  
He Yang ◽  
Sun-Ting Yan ◽  
Zhi-Jiang Jin
Keyword(s):  
Burst Pressure ◽  
Corrosion Defect ◽  
Axial Tension ◽  
Subsea Pipelines

scholarly journals Sustainable Sources from Aquatic Organisms for Cosmeceuticals Ingredients

Cosmetics ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 48
Author(s):  
Carmen G. Sotelo ◽  
María Blanco ◽  
Patricia Ramos ◽  
José A. Vázquez ◽  
Ricardo I. Perez-Martin
Keyword(s):  
Social Issues ◽  
Good Condition ◽  
Aquatic Organisms ◽  
The Body ◽  
Fishing Activity ◽  
Marine Biomass ◽  
Cosmetic Industry ◽  
Wide Range ◽  
Long Life ◽  
By Products

Long life expectancy of populations in the developing world together with some cultural and social issues has driven the need to pay special attention to health and physical appearance. Cosmeceuticals are gaining interest in the cosmetic industry as their uses fulfills a double purpose: the requirements of a cosmetic (clean, perfume, protect, change the appearance of the external parts of the body or keeping them in good condition) with a particular bioactivity function. The cosmetics industry, producing both cosmetics and cosmeceuticals, is currently facing numerous challenges to satisfy different attitudes of consumers (vegetarianism, veganism, cultural or religious concerns, health or safety reasons, eco-friendly process, etc.). A currently growing trend in the market is the interest in products of low environmental impact. Marine origin ingredients are increasingly being incorporated into cosmeceutical preparations because they are able to address several consumer requirements and also due to the wide range of bioactivities they present (antioxidant, whitening, anti-aging, etc.). Many companies claim “Marine” as a distinctive marketing signal; however, only a few indicate whether they use sustainable ingredient sources. Sustainable marine ingredients might be obtained using wild marine biomass through a sustainable extractive fishing activity; by adopting valorization strategies including the use of fish discards and fish by-products; and by sustainably farming and culturing marine organisms.

scholarly journals Impact of mechanized clam dredging on the discarded megabenthic fauna on the Catalan coast (NW Mediterranean)

2021 ◽  
pp. 1-9
Author(s):  
Marc Baeta ◽  
Claudia Rubio ◽  
Françoise Breton
Keyword(s):  
Small Scale ◽  
Fishing Activity ◽  
Lethal Damage ◽  
Catalan Coast ◽  
Nw Mediterranean ◽  
Chamelea Gallina ◽  
Level Scale ◽  
Nw Mediterranean Sea ◽  
The Impact ◽  
Partial Damage

Abstract There is an important small-scale fishery using mechanized dredges and targeting clams (mainly wedge clam Donax trunculus and striped venus clam Chamelea gallina) along the Catalan coast (NW Mediterranean Sea). This study evaluated for the first time the discards and impact of mechanized clam dredging on the Catalan coast. To this end, three surveys were performed on board standard clam vessels (September and November 2016 and January 2017). Surveys were conducted in the three main clam fishing areas (Rosas Bay, South Barcelona and Ebro Delta). The composition of discards and the impact caused to discarded species was assessed using a three-level scale (undamaged; minor or partial damage; and lethal damage). Our study revealed that a large proportion of the catch (between 67–82% weight) is discarded. Even though about 63% of the discarded species were undamaged, 11% showed minor or partial damage and 26% lethal damage. Infaunal and epifaunal species with soft-body or fragile shells were the most impacted by the fishing activity (e.g. the sea urchin Echinocardium mediterraneum (~89%) and the bivalve Ensis minor (~74%)). Our results showed different levels of impact by target species and fishing area.

scholarly journals Detecting the impacts on UK sublittoral rock communities of resuspended sediments from fishing activity

2021 ◽  
Vol 125 ◽  
pp. 107545
Author(s):  
Hayley Hinchen ◽  
Jennifer Gallyot ◽  
Anita Carter ◽  
Matthew Ferguson ◽  
Karen Webb ◽  
...  
Keyword(s):  
Fishing Activity
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