Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Flood Deposits"”.
-
Comparison of Landslides and their Related Outburst Flood Deposits, Owyhee River, Southeastern Oregon
… block the river channel and display associated flood deposits downstream. Only earthflows show aggradation deposits upstream, suggesting greater longevity than other types of mass wasting. Also, based on the frequency and size of related outburst flood deposits, smaller rock falls could possibly …
-
Paleoflood Record Reconstruction at an Archaeological Site on the Owyhee River, Southeastern Oregon
<p>The magnitude and frequency of late Holocene floods on the Owyhee River in southeastern Oregon were reconstructed from fine-grained flood deposits at three sites in the river canyon. The stratigraphy at the Birch Creek study site (BCSS) preserves a record of seven to nine large floods from the …
-
GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… altitudinal zones. Case studies include flash flood deposits, active landslide areas, sackungen, and rock avalanches. The Skardu Basin has tills preserved on many higher slopes, and sand dunes cover wide areas of fluvial sediments from a braided river system. Extensive alluvial and debris fans …
-
GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… altitudinal zones. Case studies include flash flood deposits, active landslide areas, sackungen, and rock avalanches. The Skardu Basin has tills preserved on many higher slopes, and sand dunes cover wide areas of fluvial sediments from a braided river system. Extensive alluvial and debris fans …
-
Distinguishing flood frequency and magnitude in the morphodynamics and sedimentology of rivers: insights from the South Saskatchewan River, Canada
The impact of a 1 in 40 year flood on the morphology and sedimentology of the sandy braided South Saskatchewan River, Canada was assessed. Comparison of 2004 - 2007 repeat GPR surveys and the production of DEMs of difference allowed quantification of the initial and long-term 2005 flood impact on …
-
Exploring Overbank Sediment Deposition Variation in Heavily Modified Floodplains of the Lower Mississippi River: A Sedimentological and Geophysical Analysis
… to the channel profile and surrounding floodplains through dams, dikes, revetments, dredging, and channel cutoffs. Although these changes have improved navigation and reduced flood risk, unanticipated changes to the major flood return period, individual flood severity and duration, and …
-
Geoarchaeology of the Orontes River Floodplain Surrounding Tell Qarqur, Syria
… of the Orontes River north of Tell Qarqur and floodplain deposition south and east of the site reveals a pattern of early-mid Holocene proximal overbank flood deposits followed by mid-late Holocene distal overbank deposits. There is a buried A horizon with mid-Holocene pottery between these …
-
Exploring Long-Term Flood Variability in the Lower French Broad River Using Fluvial Paleoflood Hydrology
Floods are a natural hazard affecting everyone globally. Extreme floods, defined here as floods with an annual exceedance probability ≤ 0.001, are underrepresented in streamflow records. This research aims to reconstruct past flood events from flood deposits and examine flood variability over …
-
Late Holocene Paleoflood Hydrology of the Snake River in the Lower Hells Canyon, Idaho
… Pacific Northwest, and a comprehensive paleoflood chronology on the mainstem of the river is key to identifying the frequency and magnitude of large prehistoric floods within the region. We examined and compared four sites of slackwater deposits along a 20-km reach of the Lower Hells Canyon …
-
Geomorphic Reconstruction and 3D Visualisation of a Tenth Century Volcanic Jökulhlaup at Sólheimajökull Glacier, South Iceland
Jökulhlaup (glacial outburst floods) present a recurring natural hazard to the inhabitants and infrastructure along Iceland’s south coast. The high-energy, debris-rich floods are capable of eroding, transporting and depositing vast quantities of sediment; and in some cases, can completely re-shape …
-
Geology and petrography of the Wellington Seam, Nanaimo Coalfield, Vancouver Island
… the Wellington Seam were deposited as overbank flood deposits, crevasse splays and levee deposits associated with stream channels. Siltstones, mudstones and coals of the Northfield Member, overlying the Wellington Seam, probably originated as overbank flood, crevasse splay and swamp deposits. …
-
Mid- to Late Holocene flood reconstruction from two varved sediment profiles of pre-alpine Lake Ammersee (Southern Germany)
… driving force of hydrological extremes like floods and attributing generating mechanisms is an essential prerequisite for understanding past, present, and future flood variability. Successively enhanced radiative forcing under global warming enhances atmospheric water-holding capacity and is …
-
The 2004 and 1861 Tsunami Deposits on Simeulue Island, Western Sumatra
… and geochronologic studies of tsunami deposits exposed on Simeulue Island, western Sumatra, to document the timing of past tsunamis. Three field sites were targeted to conduct these studies: Inor, Busong Bay, and Langi Bay. Stratigraphic relationships, geochronologic data, and grain …