Late Quaternary variability in coastal changes along the Texas Gulf coast

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dc.contributor.advisorAnderson, John Ben_US
dc.creatorOdezulu, Christopher Ikechukwuen_US
dc.date.accessioned2019-05-17T16:42:21Zen_US
dc.date.available2020-12-01T06:01:10Zen_US
dc.date.created2018-12en_US
dc.date.issued2018-11-26en_US
dc.date.submittedDecember 2018en_US
dc.date.updated2019-05-17T16:42:21Zen_US
dc.description.abstractThe majority of the coastal barriers in Texas are retreating landwards, only a few are stable or progradational. The barriers are responding to both external (allogenic) forcings such as relative sea-level and sediment supply, and internal (autogenic) basinal mechanisms such as antecedent topography, regional subsidence, wave climate, offshore profile, and anthropogenic effects. The central Texas coast is characterized by stable barriers whereas the upper and south Texas coast is dominated by transgressive barriers. These changes along the Texas coast became prominent in the mid-late Holocene when the rate of sea-level rise decreased. Man-made activities such as the construction of jetties and dams exacerbate the more recent changes. Transects of sediment cores that extend from back-barrier to beyond the toe of the shoreface were investigated to examine the Holocene evolution and the response of Follets Island (an end member transgressive barrier) and Matagorda Peninsula through North Padre Island (an end member of the stable barrier) to allogenic forcings. Radiocarbon ages are used to constrain the timing and rates of shoreface progradation and retrogradation. The Late Quaternary stratigraphic architecture of the Texas coast varies regionally despite a similar sea-level history. Our data shows that sea level and sediment supply played a major role in the evolution of the Texas coast. The central Texas coast-shoreface experienced high-frequency progradation and retrogradation in the mid-late Holocene whereas upper Texas coast experienced continuous flooding and landward shifts in shoreline. Based on sand budget estimates, only barriers on the central Texas coast are currently stable; upper and south Texas coastal barriers have limited sand thickness and are currently retreating landwards. With the impact of anthropogenic effects on sand delivery to the coast, some barriers are on the verge of disappearing within a few centuries given projected rates of sea-level rise.en_US
dc.embargo.terms2020-12-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationOdezulu, Christopher Ikechukwu. "Late Quaternary variability in coastal changes along the Texas Gulf coast." (2018) Diss., Rice University. <a href="https://hdl.handle.net/1911/105882">https://hdl.handle.net/1911/105882</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/105882en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectTexas coasten_US
dc.subjectbarrier islanden_US
dc.subjectTransgressive Ravinementen_US
dc.subjectTexas mud blanketen_US
dc.subjectOverwashen_US
dc.subjectSediment supplyen_US
dc.subjectContinental Shelfen_US
dc.subjectSea Levelen_US
dc.subjectAntecedent topographyen_US
dc.subjectShorelineen_US
dc.subjectShorefaceen_US
dc.subjectFlooding surfaceen_US
dc.subjectSand Budgeten_US
dc.subjectParasequencesen_US
dc.subjectProgradationen_US
dc.subjectRetrogradationen_US
dc.subjectNumerical modelingen_US
dc.subjectRadiocarbon datingen_US
dc.subject210 b analysis.en_US
dc.titleLate Quaternary variability in coastal changes along the Texas Gulf coasten_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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