A one-dimensional flood routing model for rockfill dams considering exit height

Sarkhosh, Payam; Samani, Jamal Mohammad Vali; Mazaheri, Monir

doi:10.1680/jwama.16.00015

Cited by 4 publications

(2 citation statements)

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“…Using these structures, the flood is temporarily stored in the reservoir of rockfill dams which then discharges to the downstream at a safe discharge automatically by seepage flows without needs for operational management. Since the body of these types of dams are constructed through the use of the coarse rock particles, the flow through these coarse pores will deviate from Darcy's law and generally be turbulent and the variation of flow velocity (V) with hydraulic gradient (i) will be a non-linear relation (Legrand, 2002;Sarkhosh, Samani, & Mazaheri, 2017). Where the flow in coarse porous media of rockfills is non-Darcian and turbulent, determination of seepage discharge, seepage force, flow net, and outlet discharge requires the use of non-linear relations of gradient hydraulic with flow velocity (Qian, Zhan, Zhao, & Sun, 2005).…”

Section: Introductionmentioning

confidence: 99%

Developing a mathematical framework in preliminary designing of detention rockfill dams for flood peak reduction

Riahi-Madvar

Dehghani

Akib

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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Hydraulic designing of rockfill detention dam is based on the treatment of nondarcian and non-linear turbulence flow in coarse porous media. Previous literature focused only on the regular outlet ponds, and there is a shortcoming in the design methodology for detention rockfill dams. So, this paper develops a simple novel design framework by combining the governing equation of non-linear and non-darcian flow through rockfill dams with the hydrologic flood routing in reservoirs and hydraulic rules of storage dams. An innovative mathematical framework developed for preliminary designing of detention rockfill dams. The effects of type and size of rock fill materials, the shape of reservoir, shape, and intensity of inflow hydrograph on the peak of outflow, the volume of a stored flood, coefficients of flood peak and storage are investigated by parametric study in 36000 simulations. A simple design equation for preliminary designing of detention rockfill dams is provided and its applications in two design examples are presented. Its results indicate that the developed design equation (with R 2 = 0.996, MAE = 0.008, and RMSE = 0.0041) is superior to the previous equations and can be used in preliminary designing of detention rockfill dams for flood peak reduction.

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Section: Introductionmentioning

confidence: 99%

Developing a mathematical framework in preliminary designing of detention rockfill dams for flood peak reduction

Riahi-Madvar

Dehghani

Akib

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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“…Finally, Sarkhosh et al (2018) present an attempt of onedimensional hydraulic modelling of the flow through a rockfill dam, considering non-standard boundary conditions and building upon earlier work by Hansen et al (2005).…”

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confidence: 99%

Editorial

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2018

Proceedings of the Institution of Civil Engineers - Water Manag

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This issue of Water Management brings you five inspiring papers on a broad spectrum of topics, ranging from weirs to innovative fish pass, water intakes, urban drainage networks and rockfill dams. These papers showcase the variety of tools and methods deployed in hydraulic engineering, such as advanced laboratory measurements, complex threedimensional (3D) numerical simulations and optimisation techniques, as well as good practice derived from field experience. These tools and methods synergistically combine to make our profession, water management, uniquely stimulating from both the practical and the scientific perspectives.In their Briefing article, Kitchen et al. (2018) draw attention to a recently published technical guide that provides guidance on the design and management of weirs. Weirs are common structures in the UK as well as overseas. They provide a number of services by enabling water level management for shipping, flood control, flow measurement, channel stabilisation, or hydropower, among others. However, weirs raise safety issues for water-and land-users; they may induce geomorphological impacts and they impede fish migration. Therefore, the design, operation, maintenance and adaptation of weirs require a holistic approach addressing the hydraulic, structural, environmental and safety components of weir performance. Such an approach is presented in the new guide, together with guidance on alternatives to weirs (for example, rock ramps) as well as on weir removal, which may be considered as an option for weirs that have ceased to function properly or are not needed anymore. Weir removal is beneficial in terms of fish pass, sediment continuity and river restoration as a whole; but caution must be taken in assessing and mitigating possible geomorphological consequences such as bed degradation and bank undermining upstream.Fish migration in a regulated water course may be enhanced by means of fish pass. Kucukali and Hassinger (2018) present rigorous flow and turbulence measurements in an innovative and cost-effective fish pass, which enables migration for a wide range of fish species characterised by high to low swimming capacity. The fish pass combines the features of traditional baffle fishways with those of brush-furnished fishways, without the need for resting pools (Kucukali and Hassinger, 2015). Unlike previous model tests conducted at a reduced scale, those presented by Kucukali and Hassinger (2018) were performed at a scale of 1:1 to avoid viscosity scale effects. In the tested fish pass with a bed slope of 4%, multiple continuous migration corridors were found, without obstructions for the fish to overcome or flow regime changes.Complementary to laboratory experiments, advanced 3D numerical modelling was used by Khadem Rabe et al. (2018) to simulate the flow near an anti-vortex system at a water intake. Although avoiding vortices at water intakes is of utmost importance (as they can suck surface debris and air into the pressurised flow system), considerable gaps in knowledge remain regarding ...

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