Estimation of fractional critical tractive stress from fractional bed load transport measurements of unimodal and bimodal sediments

Patel, Shaileshkumar B.; Patel, P. L.; Porey, P. D.

doi:10.1016/j.measurement.2013.08.025

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…The properties of the material mixtures in this study were significantly better represented by using d s as reference size. The depicted experiments and findings thereof in the present paper are in line with work conducted by Patel et al (2013Patel et al ( , 2014, and thus prove independently the approach of using d s as reference size to account for graded-material properties. In addition, Patel and Ranga Raju (1999) showed a strong decrease of t Ã c;i with increasing s g .…”

Section: Approaches Based On the Reference Size D Rsupporting

confidence: 87%

“…In view of nonuniform sediments the suitability of earlier approaches for the determination of incipient motion of graded or bimodal sediment mixtures is taken into focus in newer studies. The results of Patel and Ranga Raju (1999) and Patel et al (2013Patel et al ( , 2014 showed that approaches based on the median grain diameter as reference size are less accurate for the determination of fractional critical shear stress for nonuniform sediments. To account for the characteristics of graded sediments, they proposed a relationship that contains the geometric standard deviation s g within the reference size.…”

Section: Previous Workmentioning

confidence: 99%

“…To adapt critical shear stresses for specific fractions of a mixture in comparison with uniform sediments, hiding functions are generally implemented to describe how incipient motion for grain sizes in certain mixtures deviates from those of uniform beds. The prediction of the incipient motion of nonuniform sediments has been established in numerous studies for different sediments and test conditions (e.g., Egiazaroff 1965;Ashida and Michiue 1971;Hayashi et al 1980;Parker et al 1982b;Andrews 1983;Carling 1983;Kuhnle 1993;Wilcock 1993;Wu et al 2000, Patel et al 2014. Generally these approaches relate the specific fraction d i of the sediment mixture to a reference size fraction d R , often the median grain diameter d 50 , and are expressed as…”

Section: Incipient Motion Of Wide-graded Sediment Under Current Condimentioning

confidence: 99%

“…with d s as the product of the geometric mean size d g and the geometric standard deviation s g . In reference to Patel et al (2013Patel et al ( , 2014 the parameters d g and s g in this study have been calculated by using the c scale. For further details the authors refer to Patel et al (2013).…”

Section: Approaches Based On the Reference Size D Rmentioning

confidence: 99%

See 3 more Smart Citations

Erosion Stability of Wide-Graded Quarry-Stone Material under Unidirectional Current

Schendel

Goseberg

Schlurmann

2016

J. Waterway, Port, Coastal, Ocean Eng.

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Scour protection around hydraulic structures in fluvial, estuarine, and coastal waters is an essential component of a meaningful and durable design. The continuous optimization of scour protection systems and design approaches leads to faster and more cost-effective construction processes. Although scour protection now often consists of a two-layer design, approaches that incorporate only one layer depict a major step forward. Therefore, this research focuses on the stability of a wide-graded quarry-stone mixture consisting of crushed granodiorite (Jelsa quarry, Norway) with fractions ranging from 0.063 to 200 mm. The material was exposed to an incrementally increased unidirectional current in a closed-circuit flume. The induced flow field and leading parameters were measured at various positions horizontally and vertically, whereas the erosion rates were determined behind the test bed specimen. With increasing flow velocity the development of a static armor layer was observed at the bed surface. Bed-shear stresses were determined to be strongly variable across the rough test bed. Fractional critical shear stresses indicate highly selective mobility of individual fractions. Least-square fitting of the determined critical shear stresses based on the dimensionless reference grain size d i =d s (with d s as the product of the geometric mean size d g and the geometric standard deviation s g) is suitable for describing the stability behavior of the investigated material.

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Section: Approaches Based On the Reference Size D Rsupporting

confidence: 87%

Section: Previous Workmentioning

confidence: 99%

Section: Incipient Motion Of Wide-graded Sediment Under Current Condimentioning

confidence: 99%

Section: Approaches Based On the Reference Size D Rmentioning

confidence: 99%

See 2 more Smart Citations

Erosion Stability of Wide-Graded Quarry-Stone Material under Unidirectional Current

Schendel

Goseberg

Schlurmann

2016

J. Waterway, Port, Coastal, Ocean Eng.

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“…This ratio is severely changed in plain and mountainous regions because of potential changes in the sediment transport by currents. Observations and previous studies show that the BL transport rate varies depending on location, time, current status, and bed material [25][26][27][28][29], and therefore, does not have appropriate performance and offers different results. Many studies have examined the mode of transport and main factors on BL in rivers in different regions of the world.…”

Section: Introductionmentioning

confidence: 99%

Temporal Variation of Bed Load to Suspended Load Ratio in Kojour River, Iran

Sadeghi

Kheirfam

2015

CLEAN Soil Air Water

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Analysis of the river sediment transport variability under different temporal and hydrological conditions is important in hydraulics, hydrological, and soil and water conservation science and engineering. However, few studies have been conducted to study bed load (BL) and consequently BL to suspended load (SL) relationships and temporal variation of this ratio. The present study was, therefore, conducted to evaluate the temporal variation of the BL–SL ratio in the main river of the Educational and Research Forest Watershed of Tarbiat Modares University (Kojour), Iran. BL, SL, and discharge were simultaneously measured from July 2011 to June 2012, under different hydrological conditions, at a flume located at the main outlet of the watershed. The BL–SL ratios were then analyzed under different conditions, which showed that the discharge, SL, BL, and BL–SL ratio during the study period varied between 60 and 780 L s−1, 2 and 2786 mg L−1, 0.0005 and 13 mg L−1, and 0.01–8.1%, respectively. The mean ratios of the BL–SL ratio in summer, autumn, winter, and spring were 0.16, 0.86, 4.6, and 0.8%, respectively, with standard deviations of 0.067, 0.95, 2.73, and 0.56%, respectively. The mean ratio of BL–SL was about 1%, which is very low compared to figures off‐reported. Flow discharge, precipitation, and sand and gravel mining were also recognized as important factors affecting the temporal variability of BL–SL ratio in the study area.

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The Experimental Analysis of Incipient Motion Condition of Nonuniform Sediment

Kulkarni

Bhalerao

2023

Lecture Notes in Civil Engineering

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Estimation of fractional critical tractive stress from fractional bed load transport measurements of unimodal and bimodal sediments

Cited by 5 publications

References 15 publications

Erosion Stability of Wide-Graded Quarry-Stone Material under Unidirectional Current

Erosion Stability of Wide-Graded Quarry-Stone Material under Unidirectional Current

Temporal Variation of Bed Load to Suspended Load Ratio in Kojour River, Iran

The Experimental Analysis of Incipient Motion Condition of Nonuniform Sediment

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