Discussion of “White on Energy Loss”

White, Merit P.; Bakhmeteff, Boris A.; Feodoroff, N. V.; Kindsvater, Carl E.; Christiansen, J. E.; Hall, L. Standish; Rouse, Hunter

doi:10.1061/taceat.0005672

Cited by 6 publications

(3 citation statements)

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“…1, the most effectual parameters of flow through drops and related structures are; the drop vertical height (h), the depth of flow at the edge of the drop (Y b ), the depth of flow in the generated downstream pool (Y P ), the length of the downstream pool (L P ), the length of the created hydraulic jump (L B ) and the downstream channel tail water depth (Y t ). The first rational approach for investigating the hydraulics of flow through vertical drops was performed by White (1943). He offered different equations for estimating the features of flow over drops and downstream basins.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Netting Dissipaters on Increasing the Efficiency of Energy Dissipation in Vertical Drops

Bakhshian

Kabiri-Samani

2011

AMM

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Abrupt changes of the channel bed elevation in hydraulic systems, e.g. in chutes, drops and steeped spillways, results to create a sever flow kinematic energy. This excess energy, can tend to different phenomena, such as tremendous forces, scouring and degrading the channel bed, resulting to destruction of the downstream hydraulic structures. The most important source to cause this phenomena is the the existence of sequent vertical drops along the the channel. In this study, the energy dissipation efficiency was increased by installing a new type of dissipaters namely netting dissipater on the crest of the vertical drops based on model experimtation. Also, the features of hydraulic jump, created in the stilling basin, were compared to those of a simple vertical drop. By assembling the above mentioned structure to the top of the stilling basin, the jet flow direction is changed, the degree of turbulence is increased and as the results, the kinematic energy loss increases and the length of the hydraulic jump decreses. The enhanced efficiency of the proposed structure was quantified based on the achieved experimental data.

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Section: Introductionmentioning

confidence: 99%

“…Among them, equation 1 is presented to calculate energy loss between sections C and 1 (see Fig. 1) [1]. (1) where E 1 is the total energy at section 1 and Y c is the flow critical depth.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Netting Dissipaters on Increasing the Efficiency of Energy Dissipation in Vertical Drops

Bakhshian

Kabiri-Samani

2011

AMM

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“…Entre los primeros estudios sobre el análisis de la disipación en chorros de vertido libre están los realizados por White (1943) y Moore (1943) que analizan la disipación de energía en la base de una caída vertical de un escalón o grada. Moore (1943) En base a dicho análisis, Moore (1943) propone la siguiente expresión:…”

Section: Disipación De Energíaunclassified

Analysis of rectangular free-falling jets in overtopping of concrete dams

Lara¹

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La siguiente obra literaria ya ha aparecido en trabajos previos (García 2016, Valero 2018. Sin embargo, creo es necesario citarla, dada su trascendencia e interpretación literaria a la mecánica de fluidos. "Contempló con ternura la corriente, su transparencia verde, las líneas cristalinas de su misterioso dibujo. Vio surgir perlas brillantes desde el fondo y flotar quietas burbujas en la superficie, que reflejaba el azul del cielo. Con miles de ojos lo miraba a su vez el río: verdes, blancos, cristalinos, celestes. ¡Con qué fascinación y gratitud amó aquella agua! En su corazón oyó la voz, que había vuelto a despertar y le decía: «¡Ama estas aguas! ¡Quédate a su lado! ¡Aprende de ellas!». Sí: quería aprender de ellas, quería escucharlas. Quien lograra comprender aquellas aguas y sus misterios -así lo parecióentendería también muchas otras cosas, muchos misterios, todos los misterios. Pero de los misterios del río no vio más que uno ese día, un misterio que lo impresionó vivamente. Vio lo siguiente: aquella agua fluía y fluía sin cesar, y a la vez estaba siempre ahí, ¡era siempre la misma aunque se renovara a cada

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Modeling energy dissipation and hydraulic jump regime responses to channel nonuniformity at river steps

Wyrick¹,

Pasternack²

2008

J. Geophys. Res.

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[1] The river step is an important driver for geomorphic evolution in bedrock rivers, but the effect that variations in channel geometry upstream and downstream of a river step have on hydraulic jump regime and energy dissipation has not previously been investigated. The associated hydraulic jump is inherent to a river step and its regime is a primary control on step morphodynamics. In turn, the hydraulic jump regime is controlled by several variables as detailed in a new conceptual framework herein. Also in this study, a parsimonious semianalytical numerical model of step hydraulics is developed to quantify energy dissipation and delineate hydraulic jump regimes, accounting for discharge, jump submergence, and nonuniform channel geometry through a step. Despite remaining limitations in step theory, the model simulates how natural steps respond to a wide range of conditions. The model shows that hydraulic jump regime and energy dissipation exhibit greater sensitivity to channel nonuniformity as discharge increases and/or step height decreases. Also, channel conditions that create greater jump submergence lead to decreased energy dissipation, regardless of the discharge regime. The model also reinforces the common observation about gully erosion that downstream channel widening enhances upstream knickpoint migration. The new algorithm may be used to aid river engineering involving steps and could be useful for landscape evolution modeling.Citation: Wyrick, J. R., and G. B. Pasternack (2008), Modeling energy dissipation and hydraulic jump regime responses to channel nonuniformity at river steps,

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Discussion of “White on Energy Loss”

Cited by 6 publications

References 0 publications

The Effect of Netting Dissipaters on Increasing the Efficiency of Energy Dissipation in Vertical Drops

The Effect of Netting Dissipaters on Increasing the Efficiency of Energy Dissipation in Vertical Drops

Analysis of rectangular free-falling jets in overtopping of concrete dams

Modeling energy dissipation and hydraulic jump regime responses to channel nonuniformity at river steps

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