River hydraulics – a view from midstream

Knight, Donald W.

doi:10.1080/00221686.2012.749431

Cited by 31 publications

(12 citation statements)

References 38 publications

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“…Many readers will certainly agree that "river engineering is an art as well as a science, and that modelling should therefore take into account two distinct elements: theoretical fluid mechanics and a multitude of practical issues", as Knight (2013) claimed. By "art", one usually emphasizes that hydraulics does not rely solely on explicit knowledge -that is, a collection of equations, rules and diagrams -but also on the implicit knowledge gained through personal experience and interaction with highly practised peers.…”

Section: Educationmentioning

confidence: 99%

Bedload transport: a walk between randomness and determinism. Part 2. Challenges and prospects

Ancey

2020

Journal of Hydraulic Research

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By the late nineteenth century, the scientific study of bedload transport had emerged as an offshoot of hydraulics and geomorphology. Since then, computing bedload transport rates has attracted considerable attention, but whereas other environmental sciences have seen their predictive capacities grow over time, particularly thanks to increased computing power, engineers and scientists are unable to predict bedload transport rates to within better than one order of magnitude. Why have we failed to improve our predictive capacity to any significant degree? A commonly shared view is that the study of bedload transport has more in common with the earth sciences than hydraulics: bedload transport rates depend on many processes that vary nonlinearly, involve various time and space scales, and are interrelated to each other. All this makes it difficult to view bedload as merely particle transport in a turbulent flow -something which can be studied in the laboratory in isolation from the natural environment. Over the last two decades, more emphasis has been put on the noisy dynamics characterizing bedload transport. This Vision Paper makes a strong case for recognizing noise (e.g. bedload transport rate fluctuations) as an intrinsic feature of bedload transport. Improving our predictive capacities requires a better understanding of the origins and nature of noise in bedload transport. This paper also reviews some of the challenges that need to be addressed in current research and teaching.

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Section: Educationmentioning

confidence: 99%

Bedload transport: a walk between randomness and determinism. Part 2. Challenges and prospects

Ancey

2020

Journal of Hydraulic Research

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“…Estos riesgos vienen asociados a la facilidad de uso de los actuales paquetes de cálculo, ya sean comerciales o no. La gestión del riesgo de inundación y los estudios eco-hidrodinámicos y geomorfológicos han sufrido una considerable transformación en los últimos años precisamente debido a las potentes herramientas numéricas (Knight 2013). Sin embargo no se puede olvidar, como puntualiza Cunge (2014), que hoy más que nunca lo que debería prevalecer es el conocimiento de la física del fenómeno y una clara definición del objetivo ingenieril frente al modelo, que es una herramienta.…”

Section: Introductionunclassified

Numerical modelling of river inundations

Castellet¹,

Cea

Corestein

2014

ing.agua

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La modelización numérica del flujo de agua en ríos es una herramienta que ayuda a dar respuesta a la legislación vigente europea y española referida a riesgo de inundación. Los modelos numéricos disponibles actualmente se encuentran en constante evolución. Mientras hace una década la modelización unidimensional era prácticamente la única alternativa, en el presente se han generalizado los modelos bidimensionales y se empiezan a utilizar los tridimensionales. Gracias a las actuales herramientas SIG, los resultados de la modelización numérica se pueden combinar con datos georreferenciados para realizar una cuantificación sistemática del riesgo de inundación. En este proceso existen aún una serie de desafíos como la consideración de los caudales sólidos y sus efectos en la morfología del cauce, una correcta descripción del flujo en puentes y estructuras, la integración de modelos hidrológicos con los modelos hidráulicos para una mejor consideración de las condiciones de contorno, y finalmente la optimización de las herramientas para disminuir los tiempos de cálculo actuales. Palabras clave | Inundaciones fluviales; riesgo de inundación; modelización numérica; ríos; modelos bidimensionales; transporte de sedimentos.

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“…La flexibilidad de los métodos utilizados hace fácilmente adaptable el análisis a otros objetivos, como la evaluación de escenarios de cambios de usos del suelo, fases de proyectos de infraestructuras, etc. Sin embargo, los modelos son representaciones abstractas de nuestro conocimiento sobre un proceso determinado y están limitados intrínsecamente por la información con la que se desarrollan (Knight, 2013). Por tanto, el máximo potencial se conseguirá combinando el poder de ambos, modelos (numéricos) junto con observaciones y datos de campo.…”

Section: Breve Discusión Y Conclusionesunclassified

Avances en el análisis del material leñoso en ríos: incorporación, transporte e influencia en el riesgo por inundaciones

Ruíz-Villanueva

Díez‐Herrero

Pozo

et al. 2015

CyG

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de Gredos (Sistema Central), presentándose una síntesis de algunos de los resultados principales obtenidos. Como conclusión fundamental, se puede afirmar que una correcta gestión de los ríos requiere a su vez de una apropiada gestión de la vegetación de ribera y el material leñoso transportado y depositado en los mismos; y esta gestión debe encontrar el compromiso para mantener las buenas condiciones ecológicas, reduciendo en lo posible los potenciales riesgos.Palabras clave: material leñoso; detritos leñosos; riesgo de inundación; avenida. AbstractThe presence of large wood (logs, trees, branches and roots) in rivers may aggravate the consequences of flood events. This material may affect infrastructures such as bridges, weirs, etc., especially those intersecting forested mountain rivers. Until recently, a widely accepted practice (in Spain) was to systematically remove wood from river channels as a preventive measure. However, it is well known now that this practice may be useless as the material is transported and deposited after each flood. In addition, this practice might be not beneficial for the natural balance of the river ecosystem in a long term perspective. Therefore, the presence of this woody material in rivers must be managed and included in flood hazard and risk analysis. However, there is lack of studies in this respect in Spain, and therefore there is a lack of related bibliography in Spanish. In this paper we present a detailed review of recent methods proposed to analyse large wood in rivers, and in addition we propose a comprehensive methodological approach to study the role of large wood in rivers, with a focus on flood hazard. First, to understand the dynamics of wood recruitment, the contributing areas delivering wood to the streams have to be delineated and the recruitment processes studied. Thus, an estimate of the potential volume of deliverable wood can be obtained. To analyse wood transport we present a numerical model, which allows simulating the behaviour of individual pieces of wood together with hydrodynamics. These methods have been tested in several rivers in Gredos Mountain Range (Ávila, Spain), and we present here a synthesis of the main obtained results. As a final conclusion of these results we can affirm that a good river management requires a proper management of the riparian vegetation and in-stream large wood, and this management should find the equilibrium between the good ecological conditions and the potential risks.

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River hydraulics – a view from midstream

Cited by 31 publications

References 38 publications

Bedload transport: a walk between randomness and determinism. Part 2. Challenges and prospects

Bedload transport: a walk between randomness and determinism. Part 2. Challenges and prospects

Numerical modelling of river inundations

Avances en el análisis del material leñoso en ríos: incorporación, transporte e influencia en el riesgo por inundaciones

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