Studies on River Training

Mosselman, E.

doi:10.3390/w12113100

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…The first Chinese emperor Yu the Great developed a strategy to regulate floods by giving the river additional space rather than only erecting dikes and dams along its banks around 2200-2100 BC. [10] Employees dug the riverbeds, redirected floodwater into a network of irrigation canals, and widened a Yellow River bottleneck at Mount Longmen. [11] Describes how rivers were modified in classical antiquity for military purposes although the precise truth of his accounts is debated.…”

Section: Introductionmentioning

confidence: 99%

“…The structures used for river training include longitudinal structures such as bank revetments and guide bunds, as well as transverse structures such as groins, and spur dikes. Some useful advice that is not immediately apparent to beginners or laypeople is shared by seasoned river engineers [10]. For example, groins or spurs pointing downstream draw flows to the river bank instead of deflecting them away from it.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modelling of River Training Work: A review

Jaafar,

Sayl,

Kamel

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The construction of river training structures has a local influence on hydraulic and sediment regimes. River training is simply to modify the dimensions and patterns of channels, bars, and pools. Many scientists have applied and developed methods to identify suitable techniques for river training. In this paper 60 scientific papers were reviewed, and through this review, the researchers were divided according to the method of using the model and according to the problem that the researcher addressed, as 22% of the researchers tended to solve the sediment problem using the HEC-RAS model, and 45% of the researchers tended to solve the problem floods using the HEC- RAS model, as well as 23% of the researchers tended to refine the river section, while the last part of the researchers, who accounted for 10%, worked to solve the navigation problem by increasing the depth, and the most used model was obtained by the researchers, which is HEC- RAS, and reached. The percentage of researchers who used the model is 93%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of River Training Work: A review

Jaafar,

Sayl,

Kamel

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…To minimize artificial influences on the occurrence of bedforms, a erosion zone of 2 m in length was placed at the upstream end of the channel. These are the so-called free bars conditions 27,28 . Water supply was provided from the upstream end, the flow rate Q was assumed to be steady, and an electromagnetic flow meter was used to confirm that the steady state was maintained.…”

Section: Introductionmentioning

confidence: 99%

Novel hypothesis on the occurrence of sandbars

seki,

Seki,

Moteki

et al. 2023

Preprint

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The mechanism of sandbars initiation and formation is unresolved. The occurrence of sandbars has been investigated using stability analysis, which assumes that sandbars occur due to the inherent instability of a riverbed. However, there are no data, either from riverine observations or model experiments, to support this assumption. Here, we conducted flume experiments in which sandbars were formed from a flatbed by simultaneously measuring the water surface and bottom surface. The results showed that the process of sandbars initiation and formation first involves the generation of small periodic bedforms; then, the bedforms transition to small three-dimensionally shaped rhomboid bars, and finally the rhomboid bars transition to sandbars. The measurements also suggested that wave trains occurred on the water surface. We then conducted fixed-bed experiments under the same conditions as a moving bed to ascertain the behavior of the water surface. The results of these fixed-bed experiments showed that standing waves were observed on the water surface even when the experimental conditions were steady and the flatbed channel was straight. A two-dimensional wavenumber analysis showed that the dominant wavenumbers of the standing waves and initial small bedforms were in good agreement. The whole set of results indicated that standing waves were already present on the water surface before bedforms occurred and that one of the factors in sandbars initiation was the presence of standing waves on the water surface.

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“…El desarrollo urbano y la necesidad de espacio para infraestructura ha confinado muchos ríos y limitado su posibilidad de divagación, entre ellos el río Medellín, razón por la cual el único grado de libertad disponible para este es la vertical, generado así procesos de erosión y socavación que resultan a largo plazo en modificaciones de la pendiente longitudinal del canal (Mosselman, 2020). Dicha situación ha generado la necesidad de evaluar el comportamiento hidráulico del canal y de obras de mitigación para diferentes escenarios hidrológicos (Universidad Nacional, 2013).…”

Section: Introductionunclassified

Comparación de los modelos hecras 1D y 2D para la simulación de ríos urbanos

Rios Arboleda

2023

reveia

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En este trabajo de investigación se realiza un análisis comparativo entre los resultadosde velocidad de flujo y profundidad del agua obtenidos mediante la implementación de dos conocidos software de uso libre, el HEC-RAS 4.1 versión unidimensional y el HECRAS 6.0 versión bidimensional. La simulación hidráulica se realizó en un tramo recto y de geometría trapecial uniforme del canal del río Medellín donde se contaba con topobatimetría y caudales de diseño. Los resultados preliminares obtenidos con el modelo HECRAS 6.0 versión bidimensional sugieren que para tramos rectos y uniformes los resultados de la simulación son bastantes similares a los obtenidos con el HEC-RAS 4.1 versión unidimensional. Se concluye que la elaboración de ambos tipos de modelos exige un grado de experiencia importante, sin embargo, el modelo unidimensional arroja valores de las variables hidráulicas sin un grado de esfuerzo y coste computacional tan alto, sin embargo, es evidente que para efectos de manchas de inundación y definición de profundidades es más conveniente el uso del modelo bidimensional pues permite obtener profundidades mayores.

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Studies on River Training

Cited by 12 publications

References 15 publications

Numerical Modelling of River Training Work: A review

Numerical Modelling of River Training Work: A review

Novel hypothesis on the occurrence of sandbars

Comparación de los modelos hecras 1D y 2D para la simulación de ríos urbanos

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