SPATIAL VARIATIONS OF SHEET FLOW AND SEDIMENT TRANSPORT ON AN AGRICULTURAL FIELD

A spatially integrated one-dimensional numerical model of inlet bay hydraulics has been combined with a simple sediment transport model to investigate selected tidal inlet-bay system characteristics. A parametric study has been performed using the models to determine the effect of various factors on the net direction and order of magnitude of inlet channel flow and sediment transport. Factors considered include astronomical tide type, storm surge height and duration, variation in bay surface area, time-dependent channel friction factor, and the addition of a second inlet connecting the bay and sea.

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Sediment Transport Dynamism in the Confluence Area of Two Rivers Transporting Mainly Suspended Sediment Based on Sentinel-2 Satellite Images

Water ◽

10.3390/w13213132 ◽

2021 ◽

Vol 13 (21) ◽

pp. 3132

Author(s):

Ahmed Mohsen ◽

Ferenc Kovács ◽

Gábor Mezősi ◽

Tímea Kiss

Keyword(s):

Sediment Transport ◽

Suspended Sediment ◽

Temporal Dynamics ◽

Pearson Correlation ◽

Unsupervised Classification ◽

Mixing Process ◽

Hydrological Parameters ◽

Flow And Sediment Transport ◽

Spatio Temporal ◽

Sentinel 2

Downstream of the confluence of rivers, complex hydrological and morphological processes control the flow and sediment transport. This study aimed to analyze the spatio-temporal dynamics of suspended sediment in the confluence area of the Tisza and its main tributary Maros River using Sentinel-2 images and to reveal the correlation between the hydrological parameters and the mixing process through a relatively long period (2015–2021). The surficial suspended sediment dynamism was analyzed by applying K-means unsupervised classification algorithm on 143 images. The percentages of the Tisza (TW) and Maros (MW) waters and their mixture (MIX) were calculated and compared with the hydrological parameters in both rivers. The main results revealed that the areal, lateral, and longitudinal extensions of TW and MIX have a better correlation with the hydrological parameters than the MW. The Pearson correlation matrix revealed that the discharge ratio between the rivers controls the mixing process significantly. Altogether, 11 mixing patterns were identified in the confluence area throughout the studied period. The TW usually dominates the confluence in November and January, MW in June and July, and MIX in August and September. Predictive equations for the areal distribution of the three classes were derived to support future water sampling in the confluence area.

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Calculation of Flow and Sediment Transport in the Lower Yellow River Using CCHE2Dfvm Model

Critical Transitions in Water and Environmental Resources Management ◽

10.1061/40737(2004)321 ◽

2004 ◽

Cited By ~ 1

Author(s):

Enhui Jiang ◽

Weiming Wu ◽

Sam S. Y. Wang

Keyword(s):

Sediment Transport ◽

Yellow River ◽

Lower Yellow River ◽

The Lower Yellow River ◽

Flow And Sediment Transport

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River flow and sediment transport simulation based on a curvilinear and rectilinear grid modelling approach – a comparison study

Water Science & Technology Water Supply ◽

10.2166/ws.2017.031 ◽

2017 ◽

Vol 17 (5) ◽

pp. 1325-1334 ◽

Cited By ~ 1

Author(s):

G. G. Morianou ◽

N. N. Kourgialas ◽

G. P. Karatzas ◽

N. P. Nikolaidis

Keyword(s):

Sediment Transport ◽

River Flow ◽

Morphological Changes ◽

Field Measurements ◽

Grid Model ◽

Curvilinear Grid ◽

Saint Venant Equations ◽

Flow And Sediment Transport ◽

Downstream Section ◽

The Difference

In the present work, a two-dimensional (2D) hydraulic model was used for the simulation of river flow and sediment transport in the downstream section of the Koiliaris River Basin in Crete, Greece, based on two different structured grids. Specifically, an important goal of the present study was the comparison of a curvilinear grid model with a rectilinear grid model. The MIKE 21C model has been developed to simulate 2D flows and morphological changes in rivers by using either an orthogonal curvilinear grid or a rectilinear grid. The MIKE 21C model comprises two parts: (a) the hydrodynamic part that is based on the Saint-Venant equations and (b) the morphological change part for the simulation of bank erosion and sediment transport. The difference between the curvilinear and the rectilinear grid is that the curvilinear grid lines follow the bank lines of the river, providing a better resolution of the flow near the boundaries. The water depth and sediment results obtained from the simulations for the two different grids were compared with field observations and a series of statistical indicators. It was concluded that the curvilinear grid model results were in better agreement with the field measurements.

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