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 17 of 17 for “"gravel-bed rivers"”.
-
Numerical Modelling of Braiding Processes in Gravel-Bed Rivers
Gravel-bed braided rivers are distinctive natural environments that provid a wide range of key environmental, economic and recreational services. There is, however,a growing concern that over the twentieth century, an increasing number of braided rivers have metamorphosed into wandering or single …
-
Legal Perspectives on Channel Migration of Wandering Gravel-Bed Rivers in Southern Alberta
… boundaries in Alberta that are defined by rivers are subject to the doctrine of accretion. A review of the history and development of this doctrine reveals that it accommodates all types of river channel change, including episodic movement, and that it is the overall progress of the change …
-
Drivers of Spatial Dispersion and Residence Time of Coarse Sediment in Gravel-Bed Rivers
Transport of coarse sediment in gravel-bed streams alternates between mobile and immobile phases. Mobilized sediment disperses primarily in the streamwise and vertical directions. While travel times of sediment in the channel are brief, rest times between periods of mobilization can be relatively …
-
Multi-Scale detection, mapping, and modelling geomorphic change in gravel-bed rivers with UAV remote sensing
… are produced for a 2km reach of quasi-wandering gravel-bed river. Comparative analyses of DEMs between 2016 and 2018 reveals widening of the incised margin and significant geomorphic evolution characteristic of re-naturalization following the termination of gravel mining, channelization, and …
-
The Role of Geomorphic Features and Hydrologic Processes on Sediment Clusters in Gravel-Bed Rivers, Washington: A Field-Based Approach
… be an important characteristic of the variable bed topography of gravel-bed rivers. Detailed field descriptions and digital photographs of clusters were used to determine the characteristics of clusters at chosen locations on gravel bars regularly covered by high flow events. Data were collected …
-
Cottonwood Establishment in a Gravel-Bed River
… pristine, 5th order, wandering floodplain of the gravel-bed Flathead River, Montana, USA. The focus of my research was to determine the mechanisms explaining successful recruitment on recently formed, unvegetated bars, covering a range of spatial scales from within-bar (~ 1 to 10 m) to …
-
Cottonwood Establishment in a Gravel-Bed River
… pristine, 5th order, wandering floodplain of the gravel-bed Flathead River, Montana, USA. The focus of my research was to determine the mechanisms explaining successful recruitment on recently formed, unvegetated bars, covering a range of spatial scales from within-bar (~ 1 to 10 m) to …
-
Sampling spatial sediment variation in gravel-bed streams
A gravel-bed stream's grain size distribution plays an important role in determining a river's depth, sediment transport rates, and stream bed stability as well as the survival rates of mussels and salmonids. Unfortunately, the material found in gravel-bed rivers exhibits vertical stratification as …
-
The Ecology of Parafluvial Ponds on a Salmon River
Parafluvial ponds are discrete lentic habitats embedded in the alluvia of gravel bed rivers that are formed by flooding and persist in relation to floodplain geohydrology. On the expansive flood plains of the Kwethluk River, I observed thousands of juvenile salmon apparently trapped by surface …
-
The Ecology of Parafluvial Ponds on a Salmon River
Parafluvial ponds are discrete lentic habitats embedded in the alluvia of gravel bed rivers that are formed by flooding and persist in relation to floodplain geohydrology. On the expansive flood plains of the Kwethluk River, I observed thousands of juvenile salmon apparently trapped by surface …
-
Spatial Distribution of Fine Sediment and Juvenile Freshwater Mussel Settling in the Gravel Bedded Dan River, North Carolina
… role in the benthic habitat and water quality of gravel bed rivers. Fine particles, such as sand and silt, are often suspended in the channel but can settle into the bed during low flows. The deposition of these particles is dependent on the bathymetry of the river as well as the flow conditions. …
-
Interaction of Clay Wash Load With Gravel Beds
… on the interaction of wash load particles with gravel bed rivers. The effects of excess fine sediment loading to streams on general water quality, contaminant transport, and benthic organism mortality has been well examined. A fundamental assumption in fluvial geomorphology and river engineering …
-
Modelling the morphodynamics of tidal channels
… present study deals with the morphodynamics of rivers and estuaries. The morphodynamic behaviour of natural systems has been investigated using numerical tools. As a first step the hydrodynamics and morphodynamics of both convergent and non-convergent tidal channels have been studied. The …
-
Geology and petrography of the Wellington Seam, Nanaimo Coalfield, Vancouver Island
… composite of up to three closely-associated coal beds near the base of the Northfield Member. Coal of the Wellington Seam is typically bright banded, blocky and very hard. The dry ash content of the coal is seldom less than 5 percent, and is usually over 9 percent. Its sulphur content is usually …
-
Turbulent interactions between stream flow and near-subsurface flow: a laboratory approach using particle image velocimetry and refractive index matching
Turbulent flow over a rough, porous gravel bed (particle diameter, D = 1.27 cm) is investigated in the laboratory using particle image velocimetry (PIV) and refractive index matching (RIM). This combination allows for detailed examination of flow fields both in the near-bed region and within the …
-
Dynamics of river meanders: bankfull geometry and planimetric configuration
Meandering rivers are ubiquitous on the surface of the Earth and are key elements of every ecosystem they are embedded in. They distribute water, sediments and nutrients all over the floodplain, they provide a mean of transportation and energy production, and they offer many other ecosystem …