Bedload Transport in Gravel-Bed Streams with Unimodal Sediment

Almedeij, Jaber; Diplas, Panayiotis

doi:10.1061/(asce)0733-9429(2003)129:11(896)

Cited by 54 publications

(37 citation statements)

References 13 publications

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“…The scatter of results by the proposed method as indicated by Fig. 8 albeit is large with R 2 ¼ 0.72 for data of clay-gravel mixture, and R 2 ¼ 0.597 for clay-sand-gravel mixture, but acceptable in the context of similar results generally reported in the literature on sediment transport studies (Yang et al 1996, Almedeij andDiplas 2003). Only one type of clay was however used in the present experiments.…”

Section: Computational Proceduressupporting

confidence: 83%

Influence of cohesion on suspended load transport of non-uniform sediments

Jain

Kothyari

2010

Journal of Hydraulic Research

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Experimental results are presented on suspended load transport rates of clay eroded from a channel bed made up of two types of cohesive sediment mixtures. The first mixture was prepared using fine gravel and clay with the clay proportion by weight varying from 10 to 50%. In the second mixture, equal proportions of fine gravel and fine sand were mixed with clay in proportions of 10 to 50%. Based on dimensional considerations a computational procedure was developed to estimate the rate of suspended load transport of the clay fraction eroded from the cohesive sediment mixtures. In the absence of cohesion, the proposed computational method transforms to a method for computation of suspended load transport rate of the cohesionless sediment mixtures. Studies on suspended load transport rates of cohesive sediment mixtures containing gravel as presented here were not reported so far in the literature to the best of our knowledge.

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Section: Computational Proceduressupporting

confidence: 83%

Influence of cohesion on suspended load transport of non-uniform sediments

Jain

Kothyari

2010

Journal of Hydraulic Research

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“…The mode is a less bias statistical parameter as by definition it has always the highest percentage of particles by weight and covers the largest portion of the bed surface area compared to any other size class. Relevant applications evaluating the efficiency of the mode parameter in the estimation of bedload transport rates is presented in details by Almedeij and Diplas (2003) and Almedeij et al (2006b) for the cases of unimodal and bimodal materials, respectively. As can be seen in Table 2, the average size parameters for the unimodal samples suggest the materials being in the sand range.…”

Section: Resultsmentioning

confidence: 99%

Representative Particle Size of Sediment in Storm Sewer Inlets

Almedeij¹,

Ahmad²,

Alhumoud³

2010

American J. of Environmental Sciences

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Problem statement: The aim of this study was examine the representative particle size of noncohesive sediment samples collected from different storm sewer inlets in residential catchments within Kuwait. Approach: A number of 25 sediment samples were collected from storm sewer inlets located in five residential areas in Kuwait: Bayan, Al-Nuzha, Al-Feiha, Al-Andalos and Al-Rumaithya. All the impervious areas for the selected sites are hydraulically connected to the drainage system, including the roofs for houses which are piped to the roads with gutters and thus have pronounced influence on catchment hydrology. Results: It was found that the sample median and mean particle sizes vary locally within each site and spatially compared to others, while the mode is invariant for most of the cases. This result suggests that the mode particle size is more stable in terms of magnitude than the median and mean and may constitute a robust estimator for sediment sizes reflecting the similarity found in watershed characteristics. Conclusion/Recommendations: This is the first such study conducted in Kuwait on sediment samples collected from five residential storm sewer inlets were employed to examine the average particle size readily available for transportation into the conduit.

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“…Average relation of bedload transport rates within a wide range of Shields stresses. The solid-line relation was plotted for gravel-bed streams using Almedeij and Diplas (2003) and the dash-line for pipes at the limit of deposition (LOD) using May [Ackers et al (1996)]. The relation of May is based on sediment particle d = 0.75 mm, pipe size D = 0.5 m and pipe roughness k 0 = 0.6 mm Science Publications…”

Section: Upper Limit Of Bedload Transportmentioning

confidence: 99%

Rectangular Storm Sewer Design Under Equal Sediment Mobility

Almedeij¹

2012

American Journal of Environmental Sciences

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Rectangular storm sewers are conduits delivering water to outfall locations and have sizes that are typically larger than standard pipes, by which they become subject to more sediment deposits during operation and thus require higher flow strengths to maintain the bed clean. This study suggests a design procedure of self-cleansing rectangular sewers based on maintaining a lower limit of Shields stress and an upper limit of dimensionless bedload transport capacity. The lower limit of Shields stress is proposed under two considerations: to sustain equal sediment mobility at the channel bottom instead of selective transport and to avoid progressive deposition of finer grains due to low and reducing flows. The upper dimensionless bedload capacity is determined rationally and confirmed by using experimental data obtained from the literature. An existing bedload transport equation developed under equal sediment mobility is modified to provide a basis for the design method. It is shown that the proposed design procedure can practically be applied for a channel to estimate sediment concentrations by setting the required flow strength of Shields tress and particle size. Charts are given as an example for determining explicitly the channel design parameters. The study demonstrates that despite the high flows imposed, the design specifications determined according to this criterion can reasonably be achieved in practice for a given project.

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Bedload Transport in Gravel-Bed Streams with Unimodal Sediment

Cited by 54 publications

References 13 publications

Influence of cohesion on suspended load transport of non-uniform sediments

Influence of cohesion on suspended load transport of non-uniform sediments

Representative Particle Size of Sediment in Storm Sewer Inlets

Rectangular Storm Sewer Design Under Equal Sediment Mobility

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