Show simple item record

dc.contributor.authorChoi, Jaewoonen
dc.date.accessioned2014-10-17T06:00:28Zen
dc.date.available2014-10-17T06:00:28Zen
dc.date.issued2013-04-24en
dc.identifier.othervt_gsexam:616en
dc.identifier.urihttp://hdl.handle.net/10919/50575en
dc.description.abstractHydrothermal processes at oceanic spreading centers are largely influenced by changing magmatic heat input. I use the FISHES code to investigate the evolution of surface temperature and salinity as a function of time-varying heat flux at the base of a two-phase, vapor-brine hydrothermal system. I consider a two-dimensional rectangular box that is 1.5 km deep and 4 km long with homogeneous permeability. Impermeable, insulated conditions are imposed on the left and right hand boundaries. To simulate time-varying heat flux from a sub-axial magma chamber of 500 m long half-width, I consider a variety of basal boundary conditions: (1) a constant heat flux with an value of 130 W/m2; (2) a sinusoidal heat flux with a period of 6 years and an amplitude ranging between 100 and 50 W/m2; (3) step, random, and exponential heat fluxes ranging between 200 and 15 W/m2; and (4) an analytical function of temporally decaying heat flux resulting from a simulated cooling, crystallizing magmatic sill. As a result of the investigation I find: (1) changes in bottom temperature and salinity closely follow the temporal variations in magmatic heat inputs; (2) the surface temperature response is severely damped and high frequency variations in heat flow are not detected; (3) in regions where phase separation of vapor and brine occurs, surface salinity variations may be recorded in response to changing conditions at depth, but these are smaller in amplitude.en
dc.format.mediumETDen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecthydrothermal systemen
dc.subjecttwo-phase flowen
dc.subjectmid-ocean ridgesen
dc.subjectmagmatic heaten
dc.titleThe response of two-phase hydrothermal systems to changing magmatic heat input at mid-ocean ridgesen
dc.typeThesisen
dc.contributor.departmentGeosciencesen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineGeosciencesen
dc.contributor.committeechairLowell, Robert P.en
dc.contributor.committeememberHole, John A.en
dc.contributor.committeememberGazel, Estebanen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record