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 20 of 33 for “"avulsion"”.
-
Influences of Channel Dredging on Avulsion Potential at the Atchafalaya River
<p>In 1950, the U.S. Army Corps of Engineers (USACE) reported a rapid increase of water discharge from the Mississippi River to its distributary channel; the Atchafalaya River. If not prevented by man-made structures, the complete capture of the Mississippi River by the Atchafalaya River was …
-
Sediment wave-induced channel evolution following the 2006 avulsion of the Suncook River in Epsom, New Hampshire
… of sediment can be released into a river when an avulsion carves a new channel in the landscape. Gilbert (1917) described the evolution of a similar pulse of material from mining along the Sacramento River, California as a sediment wave. Sediment waves are transient accumulations of sand and …
-
Mechanisms governing avulsions in transient landscapes : analysis of the May 2006 Suncook River avulsion in Epsom, New Hampshire
Avulsions, or rapid changes in the location of a river, usually occur in environments such as deltas, floodplains, and alluvial fans where net-deposition can raise the bed of the river above its floodplain. Avulsions are less frequent in transient landscapes, such as New England, where topography …
-
Avaliação do nível de conhecimento e atitudes práticas de médicos e enfermeiros sobre avulsão dental nas Unidades Básicas de Saúde do município de João Pessoa - PB
… control of dental caries, and in cases of dental avulsion, the fast and efficient service is what will lead to a good prognosis. Thus, it is necessary that the professionals to undertake the initial care are knowledgeable about the subject and know how to act in front of such cases. The urgent …
-
Contemporary methods of treatment of injuries and their complications in immature permanent teeth in children
… post-traumatic complications, especially after avulsion injuries in immature permanent teeth , b. to investigate the effectiveness of endodontic therapy of these complications with the use of calcium hydroxide materials in immature permanent teeth, c. to evaluate various calcium hydroxide …
-
Avulsão dentária: um estudo dos seus diversos aspectos
… used after trauma, especially in cases of tooth avulsion. The present study aims to conduct a study to review the literature on the various aspects of dental avulsion. The survey was conducted through a literature of the period 1978-2014, in books and various national and international journals, …
-
Slope and bifurcation on braided distributive fluvial systems
… networks on DFS evolve are bifurcation and avulsion. Instabilities in river channels that lead to bifurcation and avulsion are related to the 1) slope of the river channel, 2) the slope of the ground perpendicular to the channel, and 3) the ratio of the slope of the floodplain or valley …
-
River bifurcations: key processes, timescales and evolutionary trajectories
… abandonment of one of the bifurcates (known as avulsion), leading to the diversion of the majority or all the incoming water and sediment discharges towards the other bifurcate. Most studies in the literature either focused on the long-term equilibrium configurations of bifurcations or tailored …
-
Effects of physical and chemical disturbance on stream ecosystem structure and function
… of long-term acidification, a large-scale avulsion, and the individual and combined effects of physical streambed disturbance and altered refugia availability on stream structural and functional metrics.</p><p>I found that acidification was associated with changes in macroinvertebrate …
-
Sedimentology and Stratigraphy of a Matrix-Poor to Matrix-Rich Depositional Continuum in Proximal Basin Floor Strata, Upper Kaza Group, Windermere Supergroup, B.C., Canada.
… jet that formed immediately downflow of an avulsion node.
-
Influence of climate and the expansion of C4 grasses on sequence-scale cyclicity and landscape development during the late Miocene to Pleistocene of West Texas.
… sedimentation rate, less frequent channel avulsion events, and an increase in paleosol maturity. Stratigraphic stacking-patterns parallel pCO₂ concentration, suggesting that sedimentation and pedogenesis are influenced by third- to fourth-order global climate cycles.
-
Remote sensing of river kinematics and their expression in the modern and ancient stratigraphic record
… of perturbations (bend cutoffs and channel avulsions) on the large-scale kinematics of rivers; (2) the role of flood event-scale discharge variability on fine-scale patterns of erosion, deposition, and preservation along channel banklines; and (3) the three-dimensional nature of fluvial …
-
A Subsurface Stratigraphic Study of the Middle Atoka, Sebastian County, Arkansas
… overlain by localized channel deposits. Avulsion of the delta lobe possibly occurred, and a new lobe then began to prograde, depositing the sediments that formed the Freiburg. This unit is also dominated by distributary-mouth bar deposits.</p>
-
Modeling the dynamics and depositional patterns of sandy rivers
… scale I examine the conditions that lead to avulsion, the rapid abandonment of a river channel in favor of a new course at lower elevation.
-
Sedimentology and Regional Implications of Fluvial Quartzose Sandstones of the Lee Formation, Central Appalachian Basin
… in the alluvial plain was largely controlled by avulsion of the river from fully aggraded channel belts to other areas of the plain. Calculations reveal that avulsion of a single-channel system across a wide alluvial plain is a plausible mechanism for building the sheet-like sandstone bodies of …
-
A Clinical Review of Predisposing Factors in Keloids and Hypertrophic Scars
… The etiology were the intended wound(n=27), avulsion flap injury(n=24), laceration(n=19) and burn(n=12). The location were the head and neck(n=28), face(n=21), lower extremity(n=12), chest(n=11), shoulder(n=9) and upper extremity(n=1). The patients' body mass index (BMI, Kg/㎡) ranged from 21 …
-
Fluvial geomorphology and paleofloods in arid central Australia
… unconfined reaches tend to shift position by avulsion; channels in confined reaches change width and migrate laterally. The flood plains have stepped surface morphologies with prominent flood channels on their surfaces and back channels often occur between surface elements at different …
-
Fluvial geomorphology and paleofloods in arid central Australia
… unconfined reaches tend to shift position by avulsion; channels in confined reaches change width and migrate laterally. The flood plains have stepped surface morphologies with prominent flood channels on their surfaces and back channels often occur between surface elements at different …
-
Comparison of Two Potential Streamgage Locations on Scott Creek at Swanton Pacific Ranch, California
… problematic due to the occurrence of channel avulsion which is scouring and incising a new channel which threatens to undermine the left bank wingwall of the bridge. Remediation measures have been proposed, including the installation of a cross-vane and wing-deflectors, to mitigate negative …
-
Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil
… and one in reach 3, each demonstrates floodplain avulsion (erosion-triggered) and in-channel accretion (deposition-triggered), which are the two mechanisms of anabranching channel formation.
Page 1 of 2