Observations of Bed Load Transport and Channel Bed Changes in a Proglacial Mountain Stream

1992 ◽  
Vol 24 (3) ◽  
pp. 195 ◽  
Author(s):  
Jeff Warburton
Keyword(s):  
Mountain Stream ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport ◽  
Bed Changes

Coarse particle motion and resting times during bedload in a glacier-fed mountain stream of the central Chilean Andes

2020 ◽  
Author(s):  
Luca Mao ◽  
Ricardo Carrillo ◽  
Francesco Brardinoni ◽  
Matteo Toro ◽  
Luigi Fraccarollo
Keyword(s):  
Average Length ◽  
Mountain Streams ◽  
Mountain Stream ◽  
Bed Load ◽  
Pit Tags ◽  
Flow Energy ◽  
Load Transport ◽  
Bed Load Transport ◽  
Channel Slope ◽  
Chilean Andes

<p>Coarse bed load transport is a crucial process in river morphodynamics, but it is difficult to monitor in mountain streams. Predicting bed load is a difficult task especially in steep step-pool streams, where the critical dimensionless shear stress is affected by local channel slope and relative submergence, and only part of the flow energy is available to entrain and transport sediments as some is dissipated in local hydraulic plunging and jumps. Here we present a new sediment transport dataset obtained from two years of field-based monitoring (2014-2015) at the Estero Morales, a high-gradient stream in the central Chilean Andes. This stream features step-pool bed geometry and a glacier-fed hydrologic regime characterized by abrupt daily fluctuations in discharge. Bed load was monitored directly using Bunte samplers and by surveying the mobility of passive integrated transponder (PIT) tags. We used the competence method to quantify the effective slope, which is the fraction of the total slope responsible for bed load transport. This accounts for only 10% of the total slope, confirming that most of the energy is dissipated on macroroughness that characterize step-pool stream. We used the displacement lengths of PIT tags to derive the statistics of flight and resting times, observing that the average length of a flight scales inversely with grain size.</p>

scholarly journals Controls Over Particle Motion and Resting Times of Coarse Bed Load Transport in a Glacier‐Fed Mountain Stream

2020 ◽  
Vol 125 (4) ◽  
Author(s):  
Luca Mao ◽  
Matteo Toro ◽  
Ricardo Carrillo ◽  
Francesco Brardinoni ◽  
Luigi Fraccarollo
Keyword(s):  
Particle Motion ◽  
Mountain Stream ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport

Bed load transport under different streambed conditions – a field experimental study in a mountain stream

2012 ◽  
Vol 27 (4) ◽  
pp. 426-438 ◽  
Author(s):  
Guo-an YU ◽  
Zhao-yin WANG ◽  
He Qing HUANG ◽  
Huai-xiang LIU ◽  
Brendon BLUE ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mountain Stream ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport

scholarly journals The morphodynamics of a swash event on an erodible beach

2014 ◽  
Vol 762 ◽  
pp. 110-140 ◽  
Author(s):  
Fangfang Zhu ◽  
Nicholas Dodd
Keyword(s):  
Solitary Wave ◽  
Evolution Equations ◽  
Suspended Load ◽  
Bed Load ◽  
Advection Equation ◽  
Sedimentary Petrology ◽  
Load Transport ◽  
Bed Load Transport ◽  
Bed Changes ◽  
First Time

AbstractA high-accuracy numerical solution, coupling one-dimensional shallow water and bed-evolution equations, with, for the first time, a suspended sediment advection equation, thereby including bed and/or suspended load, is used to examine two swash events on an initially plane erodible beach: the event of Peregrine & Williams (J. Fluid Mech., vol. 440, 2001, pp. 391–399) and that of a solitary wave approaching the beach. Equations are solved by the method of characteristics, and the numerical model is verified. Full coupling of suspended load to beach change for Peregrine & Williams (J. Fluid Mech., vol. 440, 2001, pp. 391–399) yields only slightly altered swash flows, depending on beach mobility and sediment response time; a series of similar final beach change patterns results for different beach mobilities. Suspended- and bed-load transport have distinct morphodynamical signatures. For the solitary wave a backwash bore is created (Hibberd & Peregrine, J. Fluid Mech., vol. 95, 1979, pp. 323–345). This morphodynamical bore propagates offshore initially, and leads to the creation of a beach bed step (Larson & Sunamura, J. Sedimentary Petrology, vol. 63, 1993, pp. 495–500), primarily due to bed-load transport. Its height is directly related to bed-load mobility, and also depends strongly on the bed friction coefficient. The shock dynamics of this bed step is explained and illustrated. Bed- and suspended-load mobilities are quantified using field data, and an attempt is made to relate predictions to measurements of single swash events on a natural beach. Average predicted bed change magnitudes across the swash are of the order of 2 mm, with maximum bed changes of up to approximately 10 cm at the bed step.

Bed load transport in a steep snowmelt-dominated mountain stream as inferred from impact sensors

2008 ◽  
Vol 62 (2) ◽  
pp. 66-74 ◽  
Author(s):  
Geir Vatne ◽  
Øyvind Takøy Naas ◽  
Tommy Skårholen ◽  
Achim A. Beylich ◽  
Ivar Berthling
Keyword(s):  
Mountain Stream ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport

scholarly journals The macroinvertebrate fauna of the Młynne stream (Polish Carpathians) in the aspect of the bed load transport and water quality

2015 ◽  
Vol 47 (4) ◽  
pp. 321-332
Author(s):  
Paweł Oglęcki ◽  
Artur Radecki-Pawlik
Keyword(s):  
Water Quality ◽  
Biological Diversity ◽  
Mountain Stream ◽  
Bed Load ◽  
River Bed ◽  
Load Transport ◽  
Polish Carpathians ◽  
Bed Load Transport ◽  
River Valleys ◽  
Macroinvertebrate Fauna

Abstract The macroinvertebrate fauna of the Młynne stream (Polish Carpathians) in the aspect of the bed load transport and water quality. The qualitative composition of the bottom sediments and the bed load and suspended load transport along the mountain stream were presented. The studies were carried on the Młynne stream in Gorce (Polish Carpathians). The streams flows partially in the natural river-bed and partially in the regulated with rapids. The stream bed load is accumulated in the reservoir up to the check dam and is qualitatively different from the load deposited at the bars. The taxonomic richness of the Młynne stream is a little bigger compared with the other investigated mountain and sub-mountain streams, but lesser compared with bigger rivers. The number of taxa on the natural reaches is more than double than on the regulated ones, with more taxa of high environmental demands and high values of the BMWP-PL index. The paper brings up the question of the environmental friendly technical solutions in different human activities in the sub-mountain and mountain river valleys, advantageous for humans and the river biological diversity (or resistance for negative environmental factors) as well.

scholarly journals Bed load transport in a very steep mountain stream (Riedbach, Switzerland): Measurement and prediction

2016 ◽  
Vol 52 (12) ◽  
pp. 9522-9541 ◽  
Author(s):  
Johannes M. Schneider ◽  
Dieter Rickenmann ◽  
Jens M. Turowski ◽  
Bastian Schmid ◽  
James W. Kirchner
Keyword(s):  
Mountain Stream ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport
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