Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"Temple University" +contributor:("Ryan, Robert"). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Temple University

1. Sharifi, Youness. Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques.

Degree: PhD, 2011, Temple University

Civil Engineering

The oil from the Exxon Valdez incident is still observed in different Prince William Sound beaches over two decades. The persisting oil is slightly weathered and highly toxic to the environment. Several studies investigated the reasons for lingering oil. Different remediation techniques were tried and the results were not satisfactory. Recently, it was found that the oil is stranded in a low permeability layer. Detailed explorations showed that the exchange of the nutrients and oxygen is limited in this layer. The main objective of the present study is to explain the effect of oxygen and nutrients on the degradation phenomena in the Alaskan beaches. The general approach for this study is a combination of the field experiments and lab analysis. As it is important to eliminate any cross-layer contamination, a unique sampling method was developed. The applied method involves collecting samples from the oily layer (low permeability layer), measuring oxygen levels in the field and comparing them with the nutrient samples analyzed in the lab. The findings showed that the nutrients levels were low in the beach but the lack of effective electron acceptor is the major factor limiting the biodegradation of the oil. The seawater is responsible for delivering the oxygen and nutrients to the beach during the high tide while during low tide the landward freshwater discharges to the beach. The study of the sulfate and nitrate in the beach revealed that the levels of the alternative electron acceptors were not sufficient to support anaerobic biodegradation. Finally, for successful biodegradation of the Exxon Valdez oil, adequate levels of nutrients (nitrogen and phosphorous) and along with oxygen are required.

Temple University – Theses

Advisors/Committee Members: Boufadel, Michel C., Van Aken, Benoit, Ryan, Robert, Velinsky, David Jay, Kargbo, David M..

Subjects/Keywords: Environmental Engineering; Biodegradation; Electron Acceptors; Exxon Valdez; Nutrients; Oil Spill; Oxygen

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sharifi, Y. (2011). Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques. (Doctoral Dissertation). Temple University. Retrieved from http://digital.library.temple.edu/u?/p245801coll10,148467

Chicago Manual of Style (16th Edition):

Sharifi, Youness. “Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques.” 2011. Doctoral Dissertation, Temple University. Accessed October 29, 2020. http://digital.library.temple.edu/u?/p245801coll10,148467.

MLA Handbook (7th Edition):

Sharifi, Youness. “Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques.” 2011. Web. 29 Oct 2020.

Vancouver:

Sharifi Y. Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques. [Internet] [Doctoral dissertation]. Temple University; 2011. [cited 2020 Oct 29]. Available from: http://digital.library.temple.edu/u?/p245801coll10,148467.

Council of Science Editors:

Sharifi Y. Factors Limiting Biodegradation of the Exxon Valdez Oil Spill and Feasibility of the Bioremediation Techniques. [Doctoral Dissertation]. Temple University; 2011. Available from: http://digital.library.temple.edu/u?/p245801coll10,148467


Temple University

2. Zhang, Wei. LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems.

Degree: PhD, 2011, Temple University

Civil Engineering

The longitudinal solute transport modeling is critical in river and stream water quality management, control, and the mitigation of hazardous riverine spills. One of the widely used "deadzone" model is the transient storage model (TSM). TSM is a significant improvement over the advection-dispersion model (ADM), but it cannot simulate the breakthrough curve (BTC) immediately after a large pool. Additionally, the calibration (parameterization) method is challenged by the non-identifiability which is common to all inverse modeling, and it seems TSM cannot be easily used as a predictive tool, more of an interpretive tool of solute transport, i.e., is the parameter set calibrated via inverse modeling transferable? Pools are fundamental stream morphology unit in streams with mixed bed materials in pool-riffle or pool-step sequences. Understanding of how a pool impacts the longitudinal solute transport is the first step towards improving current model such as TSM or developing new models. By introducing a dimensionless group, e= Q/(Dt W) (where, Q is the average volumetric flow rate; Dt is an average transverse dispersion coefficient; W is the channel flow width), derived from non-dimensionalization of the governing equations of one of the most rigorous 2-dimansional (2D) (depth-averaged) model, Mike21, this work presents an alternative way of longitudinal solute transport investigation. Using the 2D fully hydrodynamic Mike21, numerical experiments were conducted on hypothetical streams in this dissertation. Simulation study on hypothetical stream with pool reveals that a pool's effects on longitudinal solute transport are manifested by three aspects: boosting longitudinal spreading (concentration peak attenuation), causing a solute plume delay and increasing solute residence time. These effects fade like a "wake" as the solute plume moves downstream. e provides an insight into the physics of longitudinal transport; it outlines a relative transverse mixing intensity of a stream. The internal transport and mixing condition (including the secondary circulations) in a pool together with the pool's dimensions determine the pool's storage effects especially when e >>1. The BTCs downstream from a pool may be "heavy tailed" (i.e., have enormously slow decaying rate) which cannot be modeled by the TSM. Results also suggest that the falling limb of a BTC more accurately characterizes the pool's storage effects because the corresponding solute has more chance to sample the entire storage area. n a more fundamental perspective, the predictive ability of inverse modeling parameterized model is discussed and conclusion is made about the role of a stream/river system's nonlinearity in determining the predictability; a misleading mis-nomenclature in TSM application is also demonstrated with a numerical experiment.

Temple University – Theses

Advisors/Committee Members: Boufadel, Michel C., Kargbo, David M., Khoury, Naji N. (Naji Najib), Ryan, Robert, Suri, Rominder P.S., Udo-Inyang, Philip D., Darvish, Kurosh.

Subjects/Keywords: Civil Engineering; Environmental Engineering; longitudinal dispersion; numerical simulation; open channel flow; parameter-transferring; solute transport; surface storage

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zhang, W. (2011). LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems. (Doctoral Dissertation). Temple University. Retrieved from http://digital.library.temple.edu/u?/p245801coll10,139476

Chicago Manual of Style (16th Edition):

Zhang, Wei. “LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems.” 2011. Doctoral Dissertation, Temple University. Accessed October 29, 2020. http://digital.library.temple.edu/u?/p245801coll10,139476.

MLA Handbook (7th Edition):

Zhang, Wei. “LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems.” 2011. Web. 29 Oct 2020.

Vancouver:

Zhang W. LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems. [Internet] [Doctoral dissertation]. Temple University; 2011. [cited 2020 Oct 29]. Available from: http://digital.library.temple.edu/u?/p245801coll10,139476.

Council of Science Editors:

Zhang W. LONGITUDINAL SOLUTE TRANSPORT IN OPEN-CHANNEL FLOW - A Numerical Simulation Study on Longitudinal Dispersion, Surface Storage Effects, Transverse Mixing, Uncertainties and Parameter-Transferring Problems. [Doctoral Dissertation]. Temple University; 2011. Available from: http://digital.library.temple.edu/u?/p245801coll10,139476

.