Characterizing Sediment Transport in Two Watersheds Using CCHE1D Sediment Transport Model PDF Download
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Author: Kezhen (Jenny) Wang
Publisher:
ISBN: 9780438629462
Category :
Languages : en
Pages :
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Book Description
Sediment is usually considered an integral part of water quality in river systems. Understanding sediment transport mechanisms is crucial for studying the fate and transport of sediment-facilitated contaminants. In order to understand sediment transport processes, a channel network model, CCHE1D, was first applied for a sensitivity analysis on simulation parameters and options at the Goodwin Creek watershed, Mississippi. The sensitivity analysis evaluated Manning's roughness coefficient, bed sediment class distribution, bankerosion and different sediment transport capacity formulas by comparing hydrology and sediment results with original data from model developers. A simulation model of the Cache Creek watershed, California was then developed to study the streamflow, and to estimate downstream sediment yield in the main channel between Rumsey and Yolo. A nonlinear relation between flow discharge and sediment yield was obtained by the sensitivity analysis, which also showed that different sediment size class had different sensitivity level towards simulation parameters and options. The sensitivity analysis results suggested that having sufficient and detailed sediment data, even in a short period of time, could be beneficial for obtaining accurate sediment yield estimation downstream. The simulation model at Cache Creek watershed was calibrated for hydrology with r2 value of 0.78; Nash-Coefficient of 0.78 and sediment yield with r2 value of 0.70; Nash-Coefficient of 0.70. It was then validated for hydrology with r2 value of 0.95; Nash-Coefficient of 0.93 and sediment yield with r2 value of 0.59; Nash-Coefficient of 0.57. The model was then applied to reconstruct 10-year suspended sediment data at Yolo based on available hydrology data and limited short-term sediment data. The results can be useful for studies at Cache Creek Settling Basin, which are important for controlling sediment entrapment and preventing spread of mercury contamination to San Francisco Bay-Delta area.
Author: Kezhen (Jenny) Wang
Publisher:
ISBN: 9780438629462
Category :
Languages : en
Pages :
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Book Description
Sediment is usually considered an integral part of water quality in river systems. Understanding sediment transport mechanisms is crucial for studying the fate and transport of sediment-facilitated contaminants. In order to understand sediment transport processes, a channel network model, CCHE1D, was first applied for a sensitivity analysis on simulation parameters and options at the Goodwin Creek watershed, Mississippi. The sensitivity analysis evaluated Manning's roughness coefficient, bed sediment class distribution, bankerosion and different sediment transport capacity formulas by comparing hydrology and sediment results with original data from model developers. A simulation model of the Cache Creek watershed, California was then developed to study the streamflow, and to estimate downstream sediment yield in the main channel between Rumsey and Yolo. A nonlinear relation between flow discharge and sediment yield was obtained by the sensitivity analysis, which also showed that different sediment size class had different sensitivity level towards simulation parameters and options. The sensitivity analysis results suggested that having sufficient and detailed sediment data, even in a short period of time, could be beneficial for obtaining accurate sediment yield estimation downstream. The simulation model at Cache Creek watershed was calibrated for hydrology with r2 value of 0.78; Nash-Coefficient of 0.78 and sediment yield with r2 value of 0.70; Nash-Coefficient of 0.70. It was then validated for hydrology with r2 value of 0.95; Nash-Coefficient of 0.93 and sediment yield with r2 value of 0.59; Nash-Coefficient of 0.57. The model was then applied to reconstruct 10-year suspended sediment data at Yolo based on available hydrology data and limited short-term sediment data. The results can be useful for studies at Cache Creek Settling Basin, which are important for controlling sediment entrapment and preventing spread of mercury contamination to San Francisco Bay-Delta area.
Author: K. Malcolm Leytham
Publisher:
ISBN:
Category : Erosion
Languages : en
Pages : 382
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Book Description
Author: Andrew Manning
Publisher: BoD – Books on Demand
ISBN: 953511039X
Category : Science
Languages : en
Pages : 392
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Book Description
Sediment Transport Processes and their Modelling Applications is a book which covers a wide range of topics. The effective management of many aquatic environments, requires a detailed understanding of sediment dynamics. This has both environmental and economic implications, especially where there is any anthropogenic involvement. Numerical models are often the tool used for predicting the transport and fate of sediment movement in these situations, as they can estimate the various spatial and temporal fluxes. However, the physical sedimentary processes can vary quite considerably depending upon whether the local sediments are fully cohesive, non-cohesive, or a mixture of both types. For this reason for more than half a century, scientists, engineers, hydrologists and mathematicians have all been continuing to conduct research into the many aspects which influence sediment transport. These issues range from processes such as scour, erosion and deposition, to how sediment process observations can be applied in sediment transport modelling frameworks. This book reports the findings from recent research in applied sediment transport which has been conducted in a wide range of aquatic environments. The research was carried out by researchers who specialise in the transport of sediments and related issues.
Author: Andrew Manning
Publisher: BoD – Books on Demand
ISBN: 9533075864
Category : Science
Languages : en
Pages : 347
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Book Description
Sediment Transport in Aquatic Environments is a book which covers a wide range of topics. The effective management of many aquatic environments, requires a detailed understanding of sediment dynamics. This has both environmental and economic implications, especially where there is any anthropogenic involvement. Numerical models are often the tool used for predicting the transport and fate of sediment movement in these situations, as they can estimate the various spatial and temporal fluxes. However, the physical sedimentary processes can vary quite considerably depending upon whether the local sediments are fully cohesive, non-cohesive, or a mixture of both types. For this reason for more than half a century, scientists, engineers, hydrologists and mathematicians have all been continuing to conduct research into the many aspects which influence sediment transport. These issues range from processes such as erosion and deposition to how sediment process observations can be applied in sediment transport modeling frameworks. This book reports the findings from recent research in applied sediment transport which has been conducted in a wide range of aquatic environments. The research was carried out by researchers who specialize in the transport of sediments and related issues. I highly recommend this textbook to both scientists and engineers who deal with sediment transport issues.
Author: Qianru Lin
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
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Book Description
Abstract: Fine-grained, cohesive sediments, widely existing in rivers, lakes, reservoirs, estuaries, etc., not only harmfully influence environment and ecosystems, but also cause problems to many types of structures, e.g., siltation in harbor entrance channels, docks and reservoirs. It has been recognized that when the fraction of fine-grained sediments is larger than about 10%, sediment mixtures consisting of cohesive and non-cohesive particles may exhibit cohesive properties, which gives a result that transport that transport processes of such mixtures are more complicated than those of coarse grained, non cohesive sediments. In an effort to understand and quantitatively predict the transport of sediment mixtures with cohesive and non-cohesive particles, a one-dimensional cohesive sediment transport model has been developed and integrated with the existing CCHE1D non-cohesive sediment transport model into a new sediment transport module, which calculates the concentrations of both cohesive and non-cohesive sediments using the same solver. Thereafter, the new sediment transport module has been incorporated with the hydrodynamic model into a newly enhanced CCHE1D model framework. A detailed mathematical description, numerical discretization, and solutions of the governing equations of the new sediment transport model are presented in this thesis. The cohesive sediment transport model simulates the deposition and erosion of cohesive sediments considering the effects of flocculation and consolidation. It relates the flocculation to the sediment size, sediment concentration, salinity, and turbulence intensity, and represents the consolidation of cohesive bed material through the temporal variation of dry bed density. The new sediment transport model takes into account the interactions between cohesive and non-cohesive sediments exceeds certain limits. The developed cohesive sediment transport model has been validated using two single-sized cohesive transport experiments conducted by Hayter (1983) and Dixit ((1982). The entire integrated sediment transport model has been tested by three real-world cases: the lower Fox River in Wisconsin, U.S., the Three Gorges Reservoir in China, and the Danjiangkou Reservoir in China. The model shows a good agreement between simulated results and measured data. After having been validated by a variety of laboratory and field cases, the new model can be applied to studies of real-world problems related to cohesive and non-cohesive sediments, with high efficiency and reliability.
Author: Latif Kalin
Publisher:
ISBN:
Category : Computer software
Languages : en
Pages : 73
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Book Description
Author: James P. Bennett
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 46
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Book Description
Author: A. Gyr
Publisher: Springer Science & Business Media
ISBN: 9781402012662
Category : Science
Languages : en
Pages : 292
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Book Description
It is evident, that for a number of ecological and technical problems in rivers and lakes a better knowledge of sediment transport and sedimentation is needed together with the ability to predict and simulate sediment behaviour. On the other hand, a stagnation of research in these topics could be observed in the last decades. At the Symposium an attempt was made to present new results in mathematics and natural sciences relevant for the sediment problem. New strategies were discussed to tackle the complexity of the problem. Basic theoretical research and laboratory experiments alone are incomplete without a feedback from field observations and measurements. For that reason well-known researchers from both basic and engineering sciences were invited. Turbulence, non-local phenomena, stability, interaction, feedback systems, self-organization, two-phase flow and chaotic processes, numerical simulations as well as measurement techniques and field results were the keywords of the Symposium. This proceedings are a good source for those interested in the state of the art.
Author: Vikas Singh
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Andrew Manning
Publisher: IntechOpen
ISBN: 9789533075860
Category : Science
Languages : en
Pages : 346
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Book Description
Sediment Transport in Aquatic Environments is a book which covers a wide range of topics. The effective management of many aquatic environments, requires a detailed understanding of sediment dynamics. This has both environmental and economic implications, especially where there is any anthropogenic involvement. Numerical models are often the tool used for predicting the transport and fate of sediment movement in these situations, as they can estimate the various spatial and temporal fluxes. However, the physical sedimentary processes can vary quite considerably depending upon whether the local sediments are fully cohesive, non-cohesive, or a mixture of both types. For this reason for more than half a century, scientists, engineers, hydrologists and mathematicians have all been continuing to conduct research into the many aspects which influence sediment transport. These issues range from processes such as erosion and deposition to how sediment process observations can be applied in sediment transport modeling frameworks. This book reports the findings from recent research in applied sediment transport which has been conducted in a wide range of aquatic environments. The research was carried out by researchers who specialize in the transport of sediments and related issues. I highly recommend this textbook to both scientists and engineers who deal with sediment transport issues.
