Intrusion dynamics of particles or droplets released continuously to the deep ocean

This thesis analyzes the flow and transport of multiphase plumes that result from a dispersed phase (e.g., droplets or particles) being discharged continuously into a stratified flowing ambient. Results are relevant to a wide range of natural and man-made applications, including the transport of oil droplets created accidentally during a deep-sea oil spill and sediment released purposefully during deep-sea mining operations. The subsequent transport and fate of small oil droplets with and without treatment using chemical dispersants is addressed experimentally and analytically. Next, we characterize the dependence of plume trapping behavior with crossflow velocity, bridging a gap in the current plume parametrization scheme. We also present a novel laboratory study aimed at understanding and quantitatively predicting secondary intrusion formation. In addition, a sensitivity analysis is conducted on plume trapping behavior to variations in key factors observed in the 2010 Deepwater Horizon oil spill field data. Another important environmental application of the study is deep-sea mining. Part of the work includes a field investigation to elucidate the trapping and dilution of mid-water plume consisted of fine sediment residuals from the mining operations, with the goal of assessing the potential environmental impact of this type of tailing disposal technique. Analytical and numerical model results are validated against field observations of the plume dynamics. Knowledge in this area helps the regulatory authorities to develop sound policies to better guide the mining activities in the deep sea to ensure sustainability of the resources and the environment.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Civil and Environmental Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2019

Author dc:creator

• Wang, Dayang,Ph. D.Massachusetts Institute of Technology.

Advisor dc:contributor.advisor

• E. Eric Adams.

• Civil and Environmental Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/121884

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/121884