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 11 of 11 for “"alluvial channels"”.
-
Modeling Low Flow Hydraulics in Alluvial Channels (pools-Riffles, Open)
The investigation of the flow condition has become important in recent years as a means of determining critical levels of water pollution, aquatic habitat and instream flow needs. To assess these critical conditions, it is necessary to predict the hydraulic response of a river system to a given low …
-
Evaluation of Linear and Nonlinear Concepts of Hydraulic Resistance in Alluvial Channels
… of research on hydraulic resistance in alluvial channels, a new set of equations has been proposed for the determination of the hydraulic resistance coefficient for alluvial channels with steady, reachwise uniform flow in equilibrium sediment transport. An analytical study based on …
-
Systematic oversteepening in longitudinal profiles of mixed bedrock-alluvial channels at tributary junctions : Appalachians, Virginia
Certain mixed bedrock/alluvial channels located in the Valley and Ridge province of the Appalachians in Virginia were identified as having a pattern of systematic oversteepening of channel gradients at tributary junctions. Where drainage area increased, channel slopes were either increasing or …
-
A field evaluation of the formative conditions, wavelengths and heights of alternate bars in alluvial channels
… the fluvial dynamics of straight natural stream channels. In particular, this experimental field study quantitatively assesses: (1) six experimentally derived formulas that predict the conditions for alternate bar formation and equilibrium bar dimensions, and (2) a physically-based nonlinear …
-
Controls on and Morphodynamic Effects of Width Variations in Bed-load Dominated Alluvial Channels: Experimental and Numerical Study
… is closely related to the planform morphology of alluvial rivers. Width adaptation bears crucial implications for river management: on one hand, channel widening may result in loss of valuable land and in the increase of the damage risk of infrastructures in surrounding areas, which are often …
-
Tertiary Sediments of the Big Hole Valley and Pioneer Mountains, Southwestern Montana: Age, Provenance, and Tectonic Implications
… of paleosols, fine-grained debris flows, small alluvial channels, and rare fluvial deposits. U-Pb geochronology of detrital zircons and air-fall tuffs indicates the presence of Oligocene to Middle Miocene sedimentary rocks outcropping at the surface. Though the presence of detrital muscovite in …
-
Tertiary Sediments of the Big Hole Valley and Pioneer Mountains, Southwestern Montana: Age, Provenance, and Tectonic Implications
… of paleosols, fine-grained debris flows, small alluvial channels, and rare fluvial deposits. U-Pb geochronology of detrital zircons and air-fall tuffs indicates the presence of Oligocene to Middle Miocene sedimentary rocks outcropping at the surface. Though the presence of detrital muscovite in …
-
The hydrogeology of the Oman Mountains
… immature, and groundwater storage is greatest in alluvial piedmont surrounding main limestone massifs. Isotopes, chemistry and hydrologic measurements show that post-storm evaporative losses are very large. The origin of limestone springs and their chemical and physical anomalies are described. …
-
The Dynamics of Coarse Sediment Transfer in an Upland Bedrock River
Bedrock channels in UK upland environments have received relatively little attention despite their importance within upland river systems and their influence on controlling the conveyance of sediment downstream. This thesis aims to quantify and model the transfer of coarse sediment through Trout …
-
The morphology of alluvial sand dunes
This Dissertation was approved for publication on 2021-04-15 at 12:04.
-
The sedimentology and dynamics of mega-dunes, Jamuna river, Bangladesh
… will dominate the preserved sediments of such alluvial channels. Existing models of dune morphology and occurrence are poor predictors at high flow stage in the Jamuna, most likely because of the low Froude numbers associated with such deep channels. Mean flow and turbulence fields, obtained …