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Showing 1 to 20 of 57 for “"aggradation"”.
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Holocene Periods of Aggradation and Incision, Hanson Creek, Washington
<p>The causes and timing of cycles of aggradation and incision in the Hanson Creek drainage in central Washington provide insight into changes in channel morphology and paleoenvironment within the region over the last 8000 years. Stratigraphically and spatially coincident archaeological evidence …
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Bed aggradation experiments in a small recirculating flume employing 40 micron silt with special reference to turbidity current depositional structures,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Measuring channel mobility through the analysis of area-based change in analog experiments, with insights into alluvial environments
… (1) In experimental deltaic environments with aggradation and sea-level rise in equilibrium, aggradation rates scale non-linearly with channel mobility. The channels in the experiment with the higher aggradation rate move more rapidly overall, but the channels in the experiment with slower …
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Holocene Geomorphology of the Macdonald and Tuross Rivers
… Wales coast primarily record a history of valley aggradation induced by post-glacial sea level rise. However, post-glacial sea level along this coast has both risen, then fallen, relative to the land during the Holocene due to isostatic compensation to loading of the ocean basins. Geomorphological …
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Holocene Geomorphology of the Macdonald and Tuross Rivers
… Wales coast primarily record a history of valley aggradation induced by post-glacial sea level rise. However, post-glacial sea level along this coast has both risen, then fallen, relative to the land during the Holocene due to isostatic compensation to loading of the ocean basins. Geomorphological …
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Cosmogenic dating of fluvial terraces in the Sorbas Basin, SE Spain
… paired isotopes allow for insights into terrace aggradation and fluvial incision timing. The fluvial deposits in the Sorbas Basin record 1.0 Ma of incision by the Río Aguas. The timing of aggradation and incision in the Sorbas basin has been linked to both tectonics and climate cycles. Terrace …
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Late Quaternary Mississippi River Incised Valley Fill: Transgressive Depositional Packages
… followed by braided fluvial (substratum) aggradation due to reduced carrying capacity after floods followed by meandering fluvial(topstratum aggradation as fluvial gradients and discharge decreased. Rapidly rising sea level prevented development of shelf phase deltas prior to~10ka. …
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Landsliding and sediment dynamics following the 2008 Wenchuan Earthquake in the Beichuan area of China
… with such loose material: up to 30m of river-bed aggradation was seen following the 1999 Chi-Chi Earthquake, Taiwan and it is thought that Sichuan may experience hazards of a similar magnitude. Preliminary reports and oblique photographs have displayed significant levels of sediment aggradation in …
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Paleosol evolution in a sequence stratigraphic framework, Cretaceous Ferron Notom Delta, south central Utah, U.S.A.
… 11 depositional facies that built 33 fluvial aggradational cycles, 9 fluvial aggradation cycles sets, and 3 sequences, within what was previously classified as a single sequence. Fluvial aggradation cycles in the succession are either simple floodplain bedsets or single channel stories that …
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Tectonic and climatic control on the evolution of the Himalayan mountain front
… conglomerates reflecting two distinct aggradation phases; following aggradation, several fluvial terraces were sculpted into these fan deposits. 10Be CRN surface exposure dating of these terrace levels provides an age of 53.4±3.2 ka for the highest-preserved terrace (AF1); subsequently, …
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New constraints on the late Cenozoic incision history of the New River, Virginia
… several periods of stalled downcutting and aggradation. Cosmogenic 10-Be exposure dating, aided by mapping and sedimentological examination of terrace deposits, is used to constrain the timing of events in this history. Fill-cut and strath terraces at elevations 10, 20, and 50 m above the …
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Quarternary Alluvial Deposition in the Upper Green River Valley, Kentucky
… medium to coarse silt, reflecting vertical aggradation, underlain by sands and gravels representing channel deposits associated with lateral channel migration. In collaboration with the Kentucky Geological Survey, additional boreholes were drilled at both sites using a Giddings probe. …
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Dating of alluvial fans from NW Argentina using cosmogenic nuclides and optically stimulated luminescence technique
… that led to repeated cycles of incision and aggradation. The results of the OSL/IRSL dating yielded ages ranging between 0.4 ± 0.1 ka and 271.8 ± 24.5 ka. Previous studies next to the study area indicate a depositional age of 1.5-2 Mio years for the oldest generation of alluvial fans, which …
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Upward-Shallowing Cycles (PACS) Of The Olney And Elmwood Members, Manlius Formation, New York
… developed gradually as a result of sedimentary aggradation; between PACs paleogeographic patterns were abruptly altered by punctuation events.
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Stratigraphic architecture of a shallow-water delta deposited in a coastal-plain setting: Neslen Formation, Floy Canyon, Utah
… shallow-water delta (Neslen delta) has bottomset aggradation only at the distal part of the system, the clinoform angles are shallow (1 to 3 degrees), the foresets were deposited primarily by tractional processes, and the mouth bars stack more compensationally. Conversely, the comparatively …
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Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
… perspective. Meter-scale fining-upward fluvial aggradation cycles (FACs) comprise fluvial aggradational cycle sets (FACSETs) 4-15 m thick. FACSETs in turn stack into four fluvial sequences 26-48 m thick. Fluvial sequences correlate between the two locations and likely accumulated in response to …
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Comparison of Landslides and their Related Outburst Flood Deposits, Owyhee River, Southeastern Oregon
… 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 have the greatest cumulative effect on river …
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Late Quaternary landscape evolution and environmental change in Charwell Basin, South Island, New Zealand
… sheets revealed multiple episodes of alluvial aggradation and degradation and, subsequent to river abandonment, gully incision prior to and coeval with loess accumulation. Spatial heterogeneity in loess sheet preservation showed a complex history of loess accumulation and erosion. A critical …
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Late Quaternary fluvial stratigraphy of the St. Albans archeologic site (46KA27), West Virginia
… and waning of late Pleistocene glaciation caused aggradation and incision events in the Ohio River valley. The principal mechanism for the development of two low terraces at St. Albans is base-level adjustments to these preceding Ohio River events.;The St. Albans terrace consists of two landforms …
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Subarctic ecosystem responses to climate, catchment and permafrost dynamics in the Holocene
… BP, and after c.2650 cal BP an early permafrost aggradation phase likely caused frost heave and significant changes in the wetland structure and hydrology. Peat is largely missing in the examined core between 2800 and 1350 cal BP, reflecting either environmental stress causing a decrease/cease of …
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