scholarly journals A probabilistic formulation of bed load transport to include spatial variability of flow and surface grain size distributions

2016 ◽  
Vol 52 (5) ◽  
pp. 3579-3598 ◽  
Author(s):  
Angel Monsalve ◽  
Elowyn M. Yager ◽  
Jens M. Turowski ◽  
Dieter Rickenmann
Keyword(s):  
Grain Size ◽  
Spatial Variability ◽  
Bed Load ◽  
Size Distributions ◽  
Probabilistic Formulation ◽  
Load Transport ◽  
Grain Size Distributions ◽  
Bed Load Transport

Measuring Bed Load Transport Rates by Grain-Size Fraction Using the Swiss Plate Geophone Signal at the Erlenbach

2016 ◽  
Vol 142 (5) ◽  
pp. 04016003 ◽  
Author(s):  
Carlos R. Wyss ◽  
Dieter Rickenmann ◽  
Bruno Fritschi ◽  
Jens M. Turowski ◽  
Volker Weitbrecht ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Fraction ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport

scholarly journals GRAIN-SIZE STATISTICAL PARAMETERS OF SANDY SEDIMENT IN KUALA GIGIENG, ACEH BESAR DISTRICT

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Syahrul Purnawan ◽  
Haekal A. Haridhi ◽  
Ichsan Setiawan ◽  
. Marwantim
Keyword(s):  
Grain Size ◽  
Sediment Load ◽  
Distribution Patterns ◽  
Sandy Sediment ◽  
Size Distributions ◽  
Statistical Parameters ◽  
Sediment Distribution ◽  
Coarse Grains ◽  
Load Transport ◽  
Grain Size Distributions

Study of sediment distribution at Kuala Gigieng was to assess the information of sediment related to the occurrence of hydro-oceanographic processes. The sediment samples were collected from nine stations using coring method. Granulometric method was used to analyze the grain size distributions. The results showed different sediment distribution patterns in each area at estuary Kuala Gigieng. The outer area of estuary indicated skewed to coarse grains, while at the inner area of estuary indicated skewed to fine grains. Different sediment load transport process was suggested as the cause of differentiated sediment characters.   Keywords: granulometry, grain size, sediment statistic, Kuala Gigieng

scholarly journals INFLUENCE OF GRAIN SIZE ON LITTORAL DRIFT

1970 ◽  
Vol 1 (12) ◽  
pp. 56 ◽  
Author(s):  
Jose Castanho
Keyword(s):  
Grain Size ◽  
Shear Stress ◽  
Bed Load ◽  
Flow Conditions ◽  
Littoral Drift ◽  
Flow Shear ◽  
Load Transport ◽  
Bed Load Transport ◽  
Flow Shear Stress ◽  
Load Discharge

Influence of grain size in sediment transport depends on flow conditions For bed load transport a maximum probably exists for load discharge as a function of gram size The important parameter seems to be the ratio To/T between the threshold shear stress and the flow shear stress.

scholarly journals GRAIN-SIZE STATISTICAL PARAMETERS OF SANDY SEDIMENT IN KUALA GIGIENG, ACEH BESAR DISTRICT

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Syahrul Purnawan ◽  
Haekal A. Haridhi ◽  
Ichsan Setiawan ◽  
. Marwantim
Keyword(s):  
Grain Size ◽  
Sediment Load ◽  
Distribution Patterns ◽  
Sandy Sediment ◽  
Size Distributions ◽  
Statistical Parameters ◽  
Sediment Distribution ◽  
Coarse Grains ◽  
Load Transport ◽  
Grain Size Distributions

<p><em>Study of sediment distribution at Kuala Gig</em><em>i</em><em>eng was to assess the information of sediment related to the occurrence of</em><em> </em><em>hydro-oceanographic processes. The sediment samples were collected from nine stations using coring method. Granulometri</em><em>c</em><em> method was used to analyze the grain size distributions. The results showed different sediment distribution patterns in each area at estuary Kuala Gig</em><em>i</em><em>eng. The outer area of estuary indicated skewed to coarse grains, while at the inner area of estuary indicat</em><em>e</em><em>d skewed to fine grains. Different sediment load transport process was suggested as the cause of differentiate</em><em>d</em><em> sediment characters.</em><em> </em></p> <p> </p> <strong><em>Keywords: </em></strong><em>granulometry, grain size, sediment statistic, Kuala Gigieng</em>

scholarly journals Controls on the rates and products of particle attrition by bed-load collisions

2020 ◽  
Author(s):  
Kimberly Litwin Miller ◽  
Douglas Jerolmack
Keyword(s):  
Mass Loss ◽  
Material Properties ◽  
Functional Dependence ◽  
Bed Load ◽  
Shape Effect ◽  
Double Pendulum ◽  
Attrition Rates ◽  
Load Transport ◽  
Grain Size Distributions ◽  
Bed Load Transport

Abstract. River rocks round through the process of impact attrition, where energetic collisions during bed-load transport induce chipping of the grain surface. This process is also important for bedrock erosion. Although previous work has shown that impact energy, lithology and shape are controlling factors for attrition rates, the functional dependence among these quantities is not settled. Here we examine these factors using a double-pendulum apparatus, that generates controlled collisions between two grains under conditions relevant for bed-load transport. We also determine the grain-size distributions (GSDs) of the attrition products. Two experimental results appear to support previous treatments of impact erosion as brittle fracture in the purely elastic regime: (i) mass loss is proportional to kinetic energy, and this proportionality is a function of previously identified material properties; and (ii) attrition product GSDs are well described by a Weibull distribution. Other observations, however, including the development of shallow and surface-parallel cracks, indicate that the common fatigue failure model is inappropriate. Rather, we propose that Hertzian fracture is the dominant mechanism that distinguishes chipping from fragmentation. We also identify an initial phase of rapid mass loss in which attrition is independent of energy and material properties; this is a shape effect associated with removal of very sharp corners. The apparent universality of both mass loss curves and attrition-product GSDs requires further investigation. Nonetheless, these findings are useful for interpreting the contribution of in-stream attrition to downstream fining and the production of sand, resulting from bed-load transport of river pebbles.

NUMERICAL MODEL TO SIMULATE THE EROSION ON THE SLOPE DUE TO OVERTOPPING

2010 ◽  
Vol 13 (3) ◽  
pp. 78-87
Author(s):  
Hoai Cong Huynh
Keyword(s):  
Numerical Model ◽  
Flow Model ◽  
Bed Load ◽  
Experiment Data ◽  
Step Method ◽  
Morphological Model ◽  
Load Transport ◽  
Bed Load Transport ◽  
The Finite Difference Method ◽  
Good Agreement

The numerical model is developed consisting of a 1D flow model and the morphological model to simulate the erosion due to the water overtopping. The step method is applied to solve the water surface on the slope and the finite difference method of the modified Lax Scheme is applied for bed change equation. The Meyer-Peter and Muller formulae is used to determine the bed load transport rate. The model is calibrated and verified based on the data in experiment. It is found that the computed results and experiment data are good agreement.

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