Historical shoreline changes in the Galveston Bay and San Antonio Bay systems, Texas Gulf Coast.

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dc.acquisition-srcen_US
dc.call-noGB459.25.H57 1983 GBAYen_US
dc.contract-noen_US
dc.contributor.authorMorton, R.A.en_US
dc.contributor.authorPaine, J.G.en_US
dc.contributor.authorWhite, W.A.en_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:04:56Z
dc.date.available2010-02-15T17:04:56Z
dc.date.issued1983en_US
dc.degreeen_US
dc.description150 p.en_US
dc.description-otheren_US
dc.description.abstractChanges in shoreline position and stability in the Galveston and San Antonio Bay systems since the late 1800's were documented using historical monitoring techniques. This is accomplished by comparing shorelines from topographic charts (dated 1850 to 1869) and aerial photographs (taken in 199-37, 1956-57, 1974, and 1982), measuring the magnitude (distance) of shoreline movement at specific sites, and calculating the rates of change for particular time periods (late 1800's to 1930's, 1930's to 1982, and late 1800's to 1982). Geological interpretations of the maps and photographs are used in conjunction with meteorological data and historical records to explain the important trends revealed in the tabulated shoreline data. Unprotected sediments forming the margins of these bays are subjected to natural coastal processes and modified by human activities that together cause shoreline movement. These unstabilized shorelines include high, nearly vertical clay bluffs, moderate slopes composed mainly of sand, salt-water marshes, sand and shell beaches, and newly formed areas filled by dredged material. Composition of the shoreline material and orientation of the shoreline with respect to prevailing wind directions and wave fetch largely determine the response and consequent movement of the shoreline. In some areas, property owners have attempted to stabilize the shoreline and prevent further movement by building seawalls and bulkheads and using riprap to dissipate wave energy. Factors contributing to shoreline changes include (1) regional and worldwide climate, (2) local changes in relative sea-level position, (3) local alterations insediment supply, (4) storm frequency and intensity, and (5) human activities. Historical data compiled for these various factors indicate that warming temperatures, rising sea level, decreasing sediment supply, recurring severe storms, and ongoing human activities all favor continued erosion of most unprotected bay shorelines.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalvestonen_US
dc.geo-codeGalveston Bayen_US
dc.geo-codeGalveston Islanden_US
dc.geo-codeEast Bayen_US
dc.geo-codeGulf of Mexicoen_US
dc.geo-codeTexas coasten_US
dc.geo-codeWest Bayen_US
dc.geo-codeTrinity Bayen_US
dc.geo-codeMorgans Pointen_US
dc.geo-codeTexas Cityen_US
dc.geo-codeSeabrooken_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/21649
dc.latitudeen_US
dc.locationGBIC Collectionen_US
dc.longitudeen_US
dc.notesPrepared for the Texas Energy and Natural Resources Advisory Council, Divison of Natural Resources.en_US
dc.placeAustin, Texasen_US
dc.publisherUniversity of Texas at Austin, Bureau of Economic Geologyen_US
dc.relation.ispartofseries3851.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectcoastal processesen_US
dc.subjectcoastal erosionen_US
dc.subjecterosionen_US
dc.subjectsedimentsen_US
dc.subjectbaysen_US
dc.subjecterosion featuresen_US
dc.subjectsediment movementen_US
dc.subjectsediment transporten_US
dc.subjectsediment compositionen_US
dc.subjectman-induced effectsen_US
dc.subjectwave effectsen_US
dc.subjectwind stressen_US
dc.subjectsea level changesen_US
dc.subjectshore protectionen_US
dc.subjectwave dynamicsen_US
dc.subjectclimateen_US
dc.subjectsea wallsen_US
dc.titleHistorical shoreline changes in the Galveston Bay and San Antonio Bay systems, Texas Gulf Coast.en_US
dc.typeBooken_US
dc.universityen_US
dc.vol-issueen_US

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