Topic
Stream power
About: Stream power is a research topic. Over the lifetime, 1135 publications have been published within this topic receiving 51324 citations.
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TL;DR: In this article, the importance of different stages of bed formation and transportation processes along the partly managed lowland section of Maros River (South Hungary) was determined, applying a series of cross-sectional data.
38 citations
TL;DR: In this paper, the physical principle of least action was applied to the determination of stable alluvial channel form, and both theoretical inferences and a case study showed that least action occurs when the criteria of minimum potential energy and maximum flow efficiency (MFE) are satisfied.
Abstract: Natural rivers exhibit regular hydraulic geometry relationships for which no widely accepted explanation has been given. This paper applies the physical principle of least action to the determination of stable alluvial-channel form. For steady, uniform alluvial-channel flow, both theoretical inferences and a case study show that least action occurs when the criteria of minimum potential energy and MFE (Maximum Flow Efficiency, defined here as the maximum sediment transporting capacity per unit available stream power) are satisfied. The consistency between bankfull hydraulic geometry relationships of natural channels and those of maximally efficient or 'least action' channels identified in this study demonstrates that alluvial channels commonly adjust to a maximally efficient section. Support for the use of the extremal hypotheses of maximum sediment transporting capacity and minimum stream power is provided by illustrating that they are essentially expressions of, and hence subsumed by, the more general p...
38 citations
TL;DR: In this article, the authors analyzed and interpreted vertical adjustments to the thalweg long profile at some 33 km river reaches redeveloped on the debris-avalanche deposit during the 30-year period since the 1980 Mount St. Helens eruption.
38 citations
TL;DR: In this article, a case study of the Raba River, a gravel-bed stream characterized by great variability of water stage and discharge, is presented, where up to 3 m of river incision has occurred since the beginning of the present century associated with an increase in stream power caused by river-control works, and reduction in bed-material load linked to changes in basin management.
Abstract: Timing and causes of the present-day channel downcutting of Carpathian tributaries to the Vistula River are exemplified by a case study of the Raba River, a gravel-bed stream characterized by great variability of water stage and discharge. Up to 3 m of river incision has occurred since the beginning of the present century associated with an increase in stream power caused by river-control works, and reduction in bed-material load linked to changes in basin management. Gravel extraction from the channel and modifications in flood flows have increased rates of incision over the last thirty years. Lowering of ground-water levels on the valley floor, increase in river-bank susceptibility to erosion, decrease or cessation of overbank-sediment accretion, and impoverishment of plant and animal communities of riverside biotopes are the principal environmental effects of channel downcutting.
38 citations
TL;DR: In this paper, it was shown that the number of anabranches increases with dimensionless discharge and stream power, which is governed mechanistically by the dynamics of bifurcations and avulsions.
Abstract: Recent research on braided river morphology shows that the intensity (number of anabranches) of braiding channels increases with dimensionless discharge and (or) stream power. This variation in intensity reflects the adjustment of total sinuosity of the river to imposed gradient at a given discharge and grain size. Only a subset of channels is active at a given time and this active braiding intensity reflects the limited number of channels that can sustain bed load transport as the flow is divided. This is governed mechanistically by the dynamics of bifurcations and avulsions. Braided channel networks also have a characteristic length scale (or scales) related to the wavelength of the bars from which braiding develops and to the scale of the bars and confluence–bifurcation units within the braided network. The range of scales is limited by the size (and, therefore, number) of the active channels within the network and the width of the entire river.
38 citations