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Colby, Bruce R.; Hembree, C. H.

doi:10.1126/science.119.3097.657-a

Cited by 42 publications

(32 citation statements)

References 3 publications

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“…A method for estimating total sediment load that is appropriate for the characteristics of rivers in Korea has not yet been developed, and relevant research is also insufficient. Thus, among existing methods for estimating total sediment load, the modified Einstein method (Colby and Hembree [4]), which is relatively widely used in Korea, was selected, and was applied to the target spot. The modified Einstein method (Colby and Hembree [4]) was selected because this equation estimates total sediment load by reflecting measured suspended sediment load/hydraulic data and the characteristics of bed material.…”

Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

“…Thus, among existing methods for estimating total sediment load, the modified Einstein method (Colby and Hembree [4]), which is relatively widely used in Korea, was selected, and was applied to the target spot. The modified Einstein method (Colby and Hembree [4]) was selected because this equation estimates total sediment load by reflecting measured suspended sediment load/hydraulic data and the characteristics of bed material. In this study, a discharge-suspended sediment load rating curve and a discharge-total sediment load rating curve were developed as shown in Equation (1) using the suspended load and hydraulic data measured at each survey line of the river section and the discharge data calculated from the stage-discharge rating curve developed in 2008.…”

Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

“…The suspended sediment load was calculated through multiplying the measured suspended load concentration by the discharge that corresponds to the stage at the time of the measurement. For the total sediment load, the discharge-total sediment load relation was estimated using the modified Einstein method (Colby and Hembree [4]), which can reflect the characteristics of measured suspended sediment load. However, the modified Einstein method also has a low reliability when applied to rivers other than alluvial rivers.…”

Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

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Survey and Analysis of the Sediment Transport for River Restoration: The Case of the Mangyeong River

Kang¹,

Yeo²

2015

OJCE

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In a river, sediment discharge, which goes through erosion, transport, and deposition by flowing water, is important data for river projects. The transport of river sediment occurs depending on the conveyance of a channel as the basin sediment discharge, which has been introduced to the river via the outflow of the basin by the erosion of fertile topsoil or ground surface due to rainfall in the target basin, and the sediment eroded within the channel is mixed together. River sediment is a major factor for river formation and ecological habitat, and is a field that is difficult to analyze or predict. For the abandoned channel restoration of the Mangyeong River, this study aimed to develop a discharge-suspended sediment load rating curve by collecting suspended load and bed material at the Bong-dong gauging station, which is a test section. The developed discharge-suspended sediment load rating curve was proposed based on the existing discharge data and the measured sediment load. The measured data and the rating curve will be used as the major data for stability and habitat restoration during channel restoration.

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Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

Section: Development Of a Discharge-sediment Load Rating Curvementioning

confidence: 99%

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Survey and Analysis of the Sediment Transport for River Restoration: The Case of the Mangyeong River

Kang¹,

Yeo²

2015

OJCE

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“…많은 연구자들이 실제 하천에서 측정 한 유사량 자료와 유사량 공식으로 산정한 유사량 값을 비교하는 연구를 수행해 왔으며 이러한 연구 결과에 의하 면 어떠한 유사량 공식을 적용하는지에 따라 유사량이 다 르게 산정된다는 것을 알 수 있다 ASCE, 1982;한국건설기술연구원, 1989;이길성과 이남 주;1992 (Brown, 1950) 공식 등이 있다. 부유사를 산정하는 공식으로는 Lane and Kalinske(1941), Einstein(1942), Brooks(1963) 등이 있 고 총유사량 공식으로는 Einstein(1942), Modified Einstein (Colby and Hembree et al, 1955), Toffaleti (1969) 공식 이 있으며 수류력에 기초한 Bagnold(1966), Engelund and Hansen (1972), Ackers and White(1973), Yang (1973) (Garbrecht et al, 1995) (Fig. 6(b)).…”

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Numerical Analysis for Bed Changes due to Sediment Transport Capacity Formulas and Sediment Transport Modes at the Upstream Approached Channel of the Nakdong River Estuary Barrage

Ji¹,

Yeo²,

Han³

2010

Journal of Korea Water Resources Association

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The effects of the selection for sediment transport equations and advection-diffusion equations according to different sediment transport modes on the modeling results of bed changes were analyzed using the CCHE2D and compared with field data in this paper. The most suitable sediment transport equation and sediment transport mode for advection-diffusion equation were suggested for the upstream approached channel of the Nakdong River Estuary Barrage. The bed changes simulated by the Engelund and Hansen formula were very small in the modeling case for the low and high flow discharges compared with the case of the Ackers and White formula. Also, the numerical modeling with the actual hydraulic event in 2002 presents that the bed change result with the bed load transport type for advection-diffusion equation was close to the field measurement more than the suspended load type.

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“…From this, other researchers began to use the concept of probability in their studies. According to Paiva (2007), the most relevant ones were: Brown (1950) Einstein and Barbarossa (1952), Colby and Hembree (1955), Toffaleti (1969). The work of Toffaleti (1969) is based on the Einstein method and allows the separate calculation of suspended and trailing sediments.…”

Section: Introductionmentioning

confidence: 99%

Principle of maximum entropy in the estimation of suspended sediment concentration

Martins

Poleto

2017

RBRH

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The concern with water quality has been promoting development of better monitoring and control techniques every day. As sediments transport most of water contaminants, their study is fundamental. Given the large number of variables for estimating sediment concentration and high costs of monitoring campaigns, it becomes necessary to develop more accessible methods which bring satisfactory practical results. Therefore, this work deals with application of the principle of maximum entropy, a probabilistic method to determine concentration of sediments in river channels with various concentrations and particle sizes. For this purpose, it was proposed a relationship between the theory of entropy parameters in order to reduce the computational effort. The results were satisfactory at concentrations above 10 g/L with R 2 greater than 0.88. The calculated squared errors in this study were lower than those found when using the theory of entropy by Tsallis and the equation of Rouse, classic models for determining the sediment concentration profile. The applicability of the proposed model and the ease of using the probabilistic method, since it reduces the amount of data needed to perform the estimate, makes it feasible on a global scale.Keywords: Sedimentology; Water resources; Modeling. RESUMOA preocupação com a qualidade das águas vem promovendo o desenvolvimento de técnicas cada dia melhores de monitoramento e controle. Como os sedimentos transportam a maior parte dos contaminantes da água, seu estudo é fundamental. Diante do elevado número de variáveis existentes para a estimativa da concentração de sedimentos e elevados custos de campanhas de monitoramento, torna-se necessário o desenvolvimento de métodos mais acessíveis e que tragam resultados práticos satisfatórios. Para tanto, este trabalho trata da aplicação do princípio da entropia máxima, um método probabilístico, para determinar a concentração de sedimentos em calhas com diversas concentrações e granulometrias. Para isso, foi proposta uma relação entre os parâmetros do princípio da entropia máxima para determinar o índice entrópico e facilitar o cálculo. Os resultados mostraram-se satisfatórios para concentrações acima de 10 g/L com R 2 superiores a 0,88. Os erros quadráticos calculados neste trabalho foram inferiores aos encontrados quando utilizada a teoria da entropia por Tsallis e pela Equação de Rouse, modelos clássicos de estimativa do perfil de concentração de sedimentos. A aplicabilidade do modelo proposto e a facilidade da utilização do método probabilístico, já que reduz a quantidade de dados necessários para realizar a estimativa, torna-o viável em escala global.Palavras-chave: Sedimentologia; Recursos hídricos; Modelagem.RBRH, Porto Alegre, v. 22, e23, 2017Principle of maximum entropy in the estimation of suspended sediment concentration

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Rejoinder

Cited by 42 publications

References 3 publications

Survey and Analysis of the Sediment Transport for River Restoration: The Case of the Mangyeong River

Survey and Analysis of the Sediment Transport for River Restoration: The Case of the Mangyeong River

Numerical Analysis for Bed Changes due to Sediment Transport Capacity Formulas and Sediment Transport Modes at the Upstream Approached Channel of the Nakdong River Estuary Barrage

Principle of maximum entropy in the estimation of suspended sediment concentration

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