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Showing 1 to 20 of 52 for “"bankfull"”.
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Objectively identifying spatial variability in bankfull stage
The bankfull flow concept has occupied a prominent role in geomorphological theory about process dynamics in alluvial meandering river systems for decades. As the flow that defines the transition between channel and floodplain and marks the level of incipient flooding, bankfull flow represents an …
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How do sand-bed meandering rivers co-construct their own bankfull discharge and bankfull channel geometry? Analytical and numerical study
… floodplain. This channel is characterized by a bankfull width and depth, longitudinal slope, and bankfull discharge when the flow spills out onto the floodplain. No specific discharge is sufficient, however, to describe how the channel maintains itself. Above-bankfull flows increase the height …
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Dynamics of river meanders: bankfull geometry and planimetric configuration
… how these external stressors affect the bankfull geometry and the planimetric configuration of meandering rivers. To achieve this goal, in this PhD thesis I combined various modelling tools, with satellite data and field measurements. I first focused the analysis on the relationship …
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Elevation based classification of streams and establishment of regime equations for predicting bankfull channel geometry
… amount of efforts have been made to develop bankfull relations for estimating channel geometry that can be employed for stream restoration practices. Focusing on these two objectives, in this study a new stream classification system based on elevation above mean sea level has been developed …
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Estimating Embeddedness From Bankfull Shear Velocity in Gravel Streambeds to Assess Sediment Impacts on Aquatic Biota
… bed streams, is negatively correlated with bankfull shear velocity (u*, m/s). This relationship can be modeled by emb = au*b, with baseline coefficient values of a = 10 and b = –1. The purpose of this thesis was to investigate the applicability of this relationship across the U.S., to begin …
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Modeling the transport of sand and mud in the Minnesota River
… The first chapter presents a study on the bankfull characteristics of rivers. The bankfull geometry of alluvial rivers is thought to be controlled by water and sediment supply, and characteristic sediment size. Here we demonstrate a novel finding: when bankfull shear velocity and bankfull …
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Geomorphic Equations and Methods for Natural Channel Design
… reaches indicates that the return period of bankfull flow (annual maximum series), ranges from 1.01 to 1.7 years, with an average of 1.2 years. This is significantly lower than the 2-year flow commonly used by engineers in naturalistic river designs. An equation is developed that predicts the …
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Channel-forming discharge and river meander migration modeling of the Pilcomayo River in the area of Misión La Paz (Argentina) and Pozo Hondo (Paraguay)
… discharge, two are described herein, namely: the bankfull discharge and the effective discharge. The bankfull discharge was obtained with the stage-discharge rating curve after identifying the stage corresponding to the elevation of the active floodplain. The effective discharge was obtained from …
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The Form and Function of Headwater Streams Based on Field and Modeling Investigations in the southern Appalachian Mountains
… flows as well as the recurrence interval of bankfull flows. Field survey results demonstrate that the channels are dominantly alluvial and vary greatly between and within channels in their overall longitudinal form, channel slope values, and grain size. These variations are due to differences …
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Predicting suspended sediment in Illinois rivers using dimensionless rating curves
… rating curve analysis. Field measurements of bankfull height at each site were taken and cross-referenced with the USGS discharge to determine bankfull discharge. The suspended sediment concentration at that bankfull discharge is referred to as the bankfull suspended sediment concentration. …
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Channel geomorphology relationships for the Beaver Creek watershed
… family of stream geometry curves that relate the bankfull parameters as functions of drainage area to carry out stream restoration works.;Positive results by the use of numerical and hydrologic models used in this study show the accuracy and state of the art advancement of such models and that …
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Estimating effective discharge at Lehman Creek, Great Basin National Park, Nevada
… an effective discharge of 0.400 m3/s. Calculated bankfull discharges are 2.52 m3/s for WL-1 and 1.48 m3/s for WL-2. Bankfull/effective discharge ratios (b/e ratio) are 30.49 for WL-1 and 3.71 for WL-2. The b/e ratio difference may be due to the steeper gradient (WL-1: 0.14, WL-2: 0.062) at WL-1, …
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Sedimentology of multistorey fluvial sandstones of the Mississippian Cypress Formation, Illinois Basin, USA
… In addition, a discrepancy between estimates of bankfull flow depths derived from mean dune cross-set thickness and core-derived channel fill thickness was identified, suggesting that most dune cross-sets in the Western Belt do not scale to predicted flow depths and that the thickest dune …
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Development of a regional curve to relate discharge and drainage area to hydraulic geometry for the Red River of the North Basin
… of the North Basin. Recurrence intervals for bankfull ranged from 1.2 to 1.6 years, with an average recurrence interval of 1.4. Discharge and drainage area data were then plotted in groupings using Level III ecoregions (Omernik et al 1998), watershed accounting unit (State of North Dakota …
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Evaluating Streambank Retreat Prediction Using the BANCS Model in the Valley and Ridge Physiographic Province
… an empirically-derived model that predicts bankfull bank erosion rates using Bank Erodibility Hazard Index (BEHI), an indicator of bank stability, and Near-Bank Stress (NBS), an indicator of applied flow energy at bankfull discharge. This study assessed the BANCS framework in the Valley and …
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… significantly (at α=0.05) positively related to bankfull Shields stress (τ*bf, p=0.04) and bankfull Shields stress adjusted for grain stress only (τ**bf, p=0.02). In stream reaches hosting bull trout redds, reach-average redd density was significantly positively related to reach-average τ**bf …
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Multi-scale hydrogeomorphic influences on bull trout spawning habitat in snowmelt-dominated headwater streams
… significantly (at α=0.05) positively related to bankfull Shields stress (τ*bf, p=0.04) and bankfull Shields stress adjusted for grain stress only (τ**bf, p=0.02). In stream reaches hosting bull trout redds, reach-average redd density was significantly positively related to reach-average τ**bf …
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Systematic connectivity in single thread meandering alluvial rivers: statistical generalization of hydraulic geometry
… connective path were made dimensionless through bankfull hydraulic geometry. As these mean statistics scale with river discharge, connective paths should follow the same trends. Systematic connectivity was computed through a numerical calculation that determines the success rate for every …
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A Method for the Determination of Design Discharges for Urban Stream Restoration Projects in Northern Virginia
… return natural function to a stream. The design (bankfull) discharge for an NCD stream restoration project is the cornerstone of a restoration design. Existing methodologies for determining design discharges, such as hydrologic modeling and bankfull identification, have not worked well for NCD …
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