scholarly journals A Two-Dimensional Depth-Averaged Sediment Transport Mobile-Bed Model with Polygonal Meshes

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1032
Author(s):  
Yong G. Lai
Keyword(s):  
Sediment Transport ◽  
Numerical Method ◽  
Model Verification ◽  
Two Dimensional ◽  
Polygonal Mesh ◽  
Mobile Bed ◽  
Wide Range ◽  
Flow And Sediment Transport ◽  
Bed Changes ◽  
Stream Bed

A polygonal-mesh based numerical method is developed to simulate sediment transport in mobile-bed streams with free surfaces. The flow and sediment transport governing equations are depth-averaged and solved in the two-dimensional (2D) horizontal space. The flow and sediment transport are further coupled to the stream bed changes so that erosion and deposition processes are simulated together with the mobile bed changes. Multiple subsurface bed layers are allowed so that bed stratigraphy may be taken into consideration. The proposed numerical discretization is valid for the most flexible polygonal mesh type which includes all existing meshes in use such as the quadrilateral-triangle hybrid mesh. The finite-volume method is adopted such that the mass conservations of both water and sediment are satisfied locally and globally. The sediment transport and stream bed processes are formulated in a general way so that the proposed numerical method may be applied to a wide range of streams and suitable for practical stream applications. The technical details of the numerical method are presented; model verification and validation studies are reported using selected cases having physical model or field measured data. The developed model is intended for general-purpose use available to the public.

Two dimensional river flow and sediment transport model

2014 ◽  
Vol 15 (3) ◽  
pp. 595-625 ◽  
Author(s):  
Zoltan Horvat ◽  
Mirjana Isic ◽  
Miodrag Spasojevic
Keyword(s):  
Sediment Transport ◽  
River Flow ◽  
Transport Model ◽  
Two Dimensional ◽  
Sediment Transport Model ◽  
Flow And Sediment Transport

A two-dimensional computational model to simulate suspended sediment transport and bed changes

1999 ◽  
Vol 37 (3) ◽  
pp. 327-344 ◽  
Author(s):  
Reinaldo Garcia-Martinez ◽  
Ivan C Saavedra ◽  
Beatriz Febres De Power ◽  
Eduardo Valera ◽  
Carlos Villoria
Keyword(s):  
Sediment Transport ◽  
Computational Model ◽  
Suspended Sediment ◽  
Suspended Sediment Transport ◽  
Two Dimensional ◽  
Bed Changes

scholarly journals Non-linearity and spatial resolution in a cellular automaton model of a small upland basin

1998 ◽  
Vol 2 (2/3) ◽  
pp. 257-264 ◽  
Author(s):  
T. J. Coulthard ◽  
M. J. Kirkby ◽  
M. G. Macklin
Keyword(s):  
Sediment Transport ◽  
Cellular Automaton ◽  
Cross Sections ◽  
Transport Processes ◽  
Small Scale ◽  
Discrete Dynamic System ◽  
Wide Range ◽  
Linear Behaviour ◽  
Flow And Sediment Transport ◽  
River Reach

Abstract. The continuing development of computational fluid dynamics is allowing the high resolution study of hydraulic and sediment transport processes but, due to computational complexities, these are rarely applied to areas larger than a reach. Existing approaches, based upon linked cross sections, can give a quasi two-dimensional view, effectively simulating sediment transport for a single river reach. However, a basin represents a whole discrete dynamic system within which channel, floodplain and slope processes operate over a wide range of space and time scales. Here, a cellular automaton (CA) approach has been used to overcome some of these difficulties, in which the landscape is represented as a series of fixed size cells. For every model iteration, each cell acts only in relation to the influence of its immediate neighbours in accordance with appropriate rules. The model presented here takes approximations of existing flow and sediment transport equations, and integrates them, together with slope and floodplain approximations, within a cellular automaton framework. This method has been applied to the basin of Cam Gill Beck (4.2 km2 ) above Starbotton, upper Wharfedale, a tributary of the River Wharfe, North Yorkshire, UK. This approach provides, for the first time, a workable model of the whole basin at a 1 m resolution. Preliminary results show the evolution of bars, braids, terraces and alluvial fans which are similar to those observed in the field, and examples of large and small scale non-linear behaviour which may have considerable implications for future models.

scholarly journals theory of generalized diffusion on suspended sediment transport in the flows with mobile bed

1990 ◽  
Vol 12 (1) ◽  
pp. 7-13
Author(s):  
Nguyen Van Diep ◽  
Dang Huu Chung
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Suspended Sediment Transport ◽  
Bed Load ◽  
Two Dimensional ◽  
Mobile Bed ◽  
Dimensional Models ◽  
The One

In this work the authors have used the theory of generalized diffusion to establish the one and two-dimensional models describing suspended sediment transport in the flows with mobile bed. Here the exchange between suspended sediment and bed-load is taken into account. The set of equations obtained is closed by using the known experiment formulas.

Aromatic Volatile Composition of Celery and Celeriac Cultivars

HortScience ◽  
1990 ◽  
Vol 25 (5) ◽  
pp. 556-559 ◽  
Author(s):  
Fredy Van Wassenhove ◽  
Patrick Dirinck ◽  
Georges Vulsteke ◽  
Niceas Schamp
Keyword(s):  
Volatile Compounds ◽  
Chromatographic Method ◽  
Apium Graveolens ◽  
Volatile Components ◽  
Two Dimensional ◽  
Qualitative Composition ◽  
Volatile Composition ◽  
Wide Range ◽  
Gas Chromatographic Method ◽  
Identification And Quantification

A two-dimensional capillary gas chromatographic method was developed to separate and quantify aromatic volatiles of celery in one analysis. The isolation, identification, and quantification of the volatile compounds of four cultivars of blanching celery (Apium graveolens L. var. dulce) and six cultivars of celeriac (Apium graveolens L. var. rapaceum) are described. The qualitative composition of Likens-Nickerson extracts of both cultivars is similar. The concentration of terpenes and phthalides, the key volatile components, found in various cultivars of both celery and celeriac varied over a wide range.

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