Spreading of sediment due to underwater blasting and dredging: Field observations from quay construction in Sisimiut, Greenland

Nielsen, Morten Holtegaard; Bach, Lis; Bollwerk, Sandra M.

doi:10.1016/j.ocecoaman.2015.09.012

Cited by 12 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the majority of published literature, the flow field surrounding bubbles merely consists of a single type of fluid. The interaction between an oscillating bubble and the interface of two immiscible fluids is far from well understood, which has applications in ultrasonic emulsification (Canselier et al 2002), pharmacy (Freitas et al 2006), the food industry (Nishinari et al 2014), sediment transport and dredging (Nielsen, Bach & Bollwerk 2015), ocean engineering (Xu et al 2020), etc.…”

Section: Introductionmentioning

confidence: 99%

Interaction of cavitation bubbles with the interface of two immiscible fluids on multiple time scales

et al. 2021

View full text Add to dashboard Cite

We experimentally, numerically and theoretically investigate the nonlinear interaction between a cavitation bubble and the interface of two immiscible fluids (oil and water) on multiple time scales. The underwater electric discharge method is utilized to generate a cavitation bubble near or at the interface. Both the bubble dynamics on a short time scale and the interface evolution on a much longer time scale are recorded via high-speed photography. Two mechanisms are found to contribute to the fluid mixing in our system. First, when a bubble is initiated in the oil phase or at the interface, an inertia-dominated high-speed liquid jet generated from the collapsing bubble penetrates the water–oil interface, and consequently transports fine oil droplets into the water. The critical standoff parameter for jet penetration is found to be highly dependent on the density ratio of the two fluids. Furthermore, the pinch-off of an interface jet produced long after the bubble dynamics stage is reckoned as the second mechanism, carrying water droplets into the oil bulk. The dependence of the bubble jetting behaviours and interface jet dynamics on the governing parameters is systematically studied via experiments and boundary integral simulations. Particularly, we quantitatively demonstrate the respective roles of surface tension and viscosity in interface jet dynamics. As for a bubble initiated at the interface, an extended Rayleigh–Plesset model is proposed that well predicts the asymmetric dynamics of the bubble, which accounts for a faster contraction of the bubble top and a downward liquid jet.

show abstract

Section: Introductionmentioning

confidence: 99%

Interaction of cavitation bubbles with the interface of two immiscible fluids on multiple time scales

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The focus group determined that dredging impacted water clarity, sedimentation, and contaminants (Figure 3 ), all of which had strong support in the global literature. These included a negative relationship with water clarity and positive relationship with sedimentation and contaminants (de Jonge et al, 2014 ; Hedge et al, 2009 ; Nielsen et al, 2015 ). We found few published studies from the Salish Sea for these pathways, despite dredging being a common practice in ports across the region (Spadaro et al, 1993 , NMFS, 2015 ) (Figure 4 ).…”

Section: Resultsmentioning

confidence: 99%

Toward a conceptual framework for managing and conserving marine habitats: A case study of kelp forests in the Salish Sea

Hollarsmith

Andrews

Naar

et al. 2022

Ecology and Evolution

View full text Add to dashboard Cite

Kelp forests are in decline across much of their range due to place‐specific combinations of local and global stressors. Declines in kelp abundance can lead to cascading losses of biodiversity and productivity with far‐reaching ecological and socioeconomic consequences. The Salish Sea is a hotspot of kelp diversity where many species of kelp provide critical habitat and food for commercially, ecologically, and culturally important fish and invertebrate species. However, like other regions, kelp forests in much of the Salish Sea are in rapid decline. Data gaps and limited long‐term monitoring have hampered attempts to identify and manage for specific drivers of decline, despite the documented urgency to protect these important habitats. To address these knowledge gaps, we gathered a focus group of experts on kelp in the Salish Sea to identify perceived direct and indirect stressors facing kelp forests. We then conducted a comprehensive literature review of peer‐reviewed studies from the Salish Sea and temperate coastal ecosystems worldwide to assess the level of support for the pathways identified by the experts, and we identified knowledge gaps to prioritize future research. Our results revealed major research gaps within the Salish Sea and highlighted the potential to use expert knowledge for making informed decisions in the region. We found high support for the pathways in the global literature, with variable consensus on the relationship between stressors and responses across studies, confirming the influence of local ecological, oceanographic, and anthropogenic contexts and threshold effects on stressor–response relationships. Finally, we prioritized areas for future research in the Salish Sea. This study demonstrates the value expert opinion has to inform management decisions. These methods are readily adaptable to other ecosystem management contexts, and the results of this case study can be immediately applied to kelp management.

show abstract

“…Sustainability 2022, 14, 9559 2 of 13 survival of aquatic plants and animals, and affects the health of the water ecosystem [5][6][7][8][9][10][11][12]. Thus, it is necessary to analyze the environmental impact of the distribution of sediment diffusion on water quality.…”

Section: Study Areamentioning

confidence: 99%

“…The diffusion of suspended sediment caused by the implementation of arresting facilities has a considerable impact on water quality [4]. The construction process disturbs the water bottom, and the resultant highly turbid suspended sediment water mass increases the concentration of suspended sediment in the surrounding water, due to the transport and diffusion of hydrodynamic conditions, which seriously affects the quality of the marine water environment, threatens the survival of aquatic plants and animals, and affects the health of the water ecosystem [5][6][7][8][9][10][11][12]. Thus, it is necessary to analyze the environmental impact of the distribution of sediment diffusion on water quality.…”

Section: Introductionmentioning

confidence: 99%

Impact of Suspended Sediment Diffusion from the Implementation of Arresting Facilities on Cross-Sea Bridges

Chen

et al. 2022

Sustainability

View full text Add to dashboard Cite

In order to ensure the safety of bridges and ships, non-navigable channel arresting facilities for ships have become an important part of cross-sea bridges, and the diffusion of suspended sediment caused by their implementation has an impact on seawater quality. Taking the Jintang bridge as an example, a two-dimensional tidal current and sediment numerical model was applied to predict the distribution of suspended sediment diffusion caused by the implementation of arresting facilities, in order to analyze seawater quality. We adopted a new formula for the equivalent roughness method, to generalize the bridge piers, and obtained good results. The results showed that the zone where the SSC (suspended sediment concentration) reached 10 mg/L was concentrated in the area from 4.5 km north to 6.5 km south of the arresting facility, when it was implemented near the western channel. The sea area by the main channel was concentrated within 500 m of the arresting facility. The impact of the implementation of the arresting facility on seawater quality was relatively limited. Only the protected marine area in the Zhenhai Section of the Hangzhou Bay Estuary Coastal Wetland was affected by the suspended sediment from the construction of the western channel.

show abstract

Spreading of sediment due to underwater blasting and dredging: Field observations from quay construction in Sisimiut, Greenland

Cited by 12 publications

References 29 publications

Interaction of cavitation bubbles with the interface of two immiscible fluids on multiple time scales

Interaction of cavitation bubbles with the interface of two immiscible fluids on multiple time scales

Toward a conceptual framework for managing and conserving marine habitats: A case study of kelp forests in the Salish Sea

Impact of Suspended Sediment Diffusion from the Implementation of Arresting Facilities on Cross-Sea Bridges

Contact Info

Product

Resources

About