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dc.contributor.advisorCardenas, Meinhard Bayani, 1977-
dc.creatorBriody, Alyse Colleenen
dc.date.accessioned2014-10-27T19:41:37Zen
dc.date.issued2014-08en
dc.date.submittedAugust 2014en
dc.identifier.urihttp://hdl.handle.net/2152/26921en
dc.descriptiontexten
dc.description.abstractPeriodic releases from an upstream dam cause rapid stage fluctuations in the Colorado River near Austin, Texas. These daily pulses modulate fluid exchange and residence times in the hyporheic region, where biogeochemical reactions are pronounced. We installed two transects of wells perpendicular to the river to examine in detail the reactions occurring in this zone of surface-water and groundwater exchange. One well transect recorded physical water level fluctuations and allowed us to map hydraulic head gradients and fluid movement. The second transect allowed for water sample collection at three discrete depths. Samples were collected from 12 wells every 2 hours for a 24-hour period and were analyzed for nutrients, carbon, major ions, and stable isotopes. The results provide a detailed picture of biogeochemical processes in the bank environment during low flow/drought conditions in a regulated river. Findings indicate that a pulse that causes a change in river stage of approximately 16-centimeters does not cause significant mixing in the bank. Under these conditions, the two systems act independently and exhibit only slight mixing at the interface.en
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.subjectHyporheic exchangeen
dc.subjectGroundwater/surface-water interactionen
dc.subjectHydropeakingen
dc.subjectNutrient dynamicsen
dc.subjectDenitrificationen
dc.subjectRiver banksen
dc.subjectDought conditionsen
dc.subjectLower Colorado Riveren
dc.subjectLonghorn Damen
dc.subjectAustin, TXen
dc.titleFlow, nutrient, and stable isotope dynamics of groundwater in the parafluvial/hyporheic zone of a regulated river during a small pulseen
dc.typeThesisen
dc.date.updated2014-10-27T19:41:38Zen
dc.description.departmentGeological Sciencesen
thesis.degree.departmentGeological Sciencesen
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Science in Geological Sciencesen


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