Experimental and Numerical Study of Discharge Capacity and Sediment Profile Upstream of Piano Key Weirs with Different Plan Geometries

Abhash, Amiya; Pandey, K. K.

doi:10.1007/s11269-021-02800-y

Cited by 20 publications

(4 citation statements)

References 17 publications

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“…The primary objective of such water diversion structures is to withdraw water from the main flow and divert it to water deficit regions, but a side-effect of these structures is that they intercept incoming sediment flows (Foufoula-Georgiou, 2013). The conventional head control structures for water and sediment flows over the diversion structures can be revised through introducing nature-friendly technology, for example Piano Key Weirs (PKW) over which sediments can be lifted by turbulence to reduce sediment interception (Machiels et al, 2010;Abhash and Pandey, 2021). Likewise, more innovative basic research is required to adopt appropriate head control elements over the existing and upcoming water control infrastructure.…”

Section: Potential To Increase Basin Scale Incoming Sediment Fluxmentioning

confidence: 99%

Sustainability of the coastal zone of the Ganges-Brahmaputra-Meghna delta under climatic and anthropogenic stresses

Rahman

Haque

Nicholls

et al. 2022

Science of The Total Environment

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Section: Potential To Increase Basin Scale Incoming Sediment Fluxmentioning

confidence: 99%

Sustainability of the coastal zone of the Ganges-Brahmaputra-Meghna delta under climatic and anthropogenic stresses

Rahman

Haque

Nicholls

et al. 2022

Science of The Total Environment

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“…The hydraulic performance of measurement structures is being improved to avoid unconventional increases in water depth in the structure upstream during high discharges and floods. The hydraulic performance of impenetrable weirs is enhanced by reducing the separation area at the upstream crest and increasing the effective length, similar to labyrinth or piano key weirs (Abhash and Pandey 2021;Mirzaei and Sheibani 2021;Roushangar et al 2021;Behroozi and Vaghefi 2022;Khowr et al 2022). In this research, attempts have been made to enhance the hydraulic performance of the PBCW by (1) reducing the effective crest length and (2) reducing the length of the flow path inside the weir and hence reducing the path loss.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Hydraulic Performance of Porous Broad-Crested Weirs with Sloping Crests

Doustkam,

Rahmanshahi,

Fathi-Moghadam

et al. 2024

Water Resour Manage

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Due to the high technical and hydraulic performance and negligible environmental adverse impact of a porous weir, this structure is a reasonable substitute for conventional impermeable solid weirs in water transmission and distribution systems. This research focused on the hydraulic performance of porous broad-crested weirs (PBCWs) with sloping crests. To this end, 30 PBCWs models in free and submerged flow conditions were designed and examined under different operation conditions. In particular, a comparative study was performed between PBCWs with and without sloping crests, the performance of which were then compared with a solid broad-crested weir (SBCW) model. Based on the results and analysis, the PBCWs with sloping crests have a more significant discharge coefficient than common PBCWs (without sloping crests), and the upstream slope has a more significant impact on the discharge coefficient than the downstream slope. In addition, the PBCWs with sloping crests are more sensitive to tailwater than common PBCWs, and thus the discharge reduction factor of the weir with the upstream crest slope is lower than that of the downstream. Finally, based on the extensive experimental results, both nonlinear multivariable regression and gene-expression programming approaches were applied to extract empirical equations for expressing the free flow discharge coefficient and submerged flow discharge reduction factor.

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“…Recently, there have been various investigations concerning porous weirs, both through experiments and numerical simulations based on computational fluid dynamics. These studies can be grouped into two main categories: 1) most of them have focused on analyzing the hydraulic performance of the weirs (Fritz and Hager 1998;Ferreira 2002;Azimi et al 2014;Salmasi and Sattari 2017;Felder and Islam 2017;Abhash and Pandey 2021;Biabani et al 2022), and 2) the second category has examined the flow patterns around them (Leu et al 2008;Mohammadpour et al 2013;Safarzadeh and Mohajeri 2018;Fathi-moghaddam et al 2018;Biabani et al 2022). The studies on hydraulic performance can be further divided into two types of weirs: those that allow flow solely through them (Michioku et al 2005;Shariq et al 2020) and those that permit both through flow and overflow (Salmasi and Sattari 2017;Safarzadeh and Mohajeri 2018;Shariq et al 2022;Hasanian Shirvan et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Multi-approach assessment for predicting submerged discharge reduction factor in porous broad-crested weirs

Seif,

Arman,

Rahmanshahi

2024

Preprint

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Environmentally friendly porous weirs have attracted the attention of researchers and engineers due to their favorable characteristics, surpassing solid weirs in terms of environmental impact, hydraulic performance, and stability. However, accurately estimating the submerged discharge coefficient for porous weirs is challenging due to the complex flow mechanisms involved, particularly under submerged conditions. The discharge under submerged conditions is typically expressed as a multiple of the free flow discharge, along with a coefficient representing the submerged discharge reduction factor (SDRF). This study aims to propose a novel artificial intelligence framework that incorporates metaheuristic techniques to predict SDRF for porous broad-crested weirs (PBCWs). The research utilized generalized normal distribution optimization (GNDO) to optimize the multilayer perceptron (MLP) model, enabling more precise predictions. The performance of the hybrid MLP-GNDO model was compared to that of an MLP, gene-expression programming (GEP), and standard nonlinear regression (SNR) models. A dataset comprising 966 observed experiments was employed to evaluate the proposed models. The results demonstrated that the hybrid MLP-GNDO model outperformed the MLP, GEP, and SR models, achieving a root mean square error of 0.021 and 0.022 and an R2 value of 0.964 and 0.954 for the training and test datasets, respectively. This model accurately predicted the train and test datasets with an average error rate of less than 2%. Regarding accuracy, the models ranked in the following order: MLP, GEP, and SNR.

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Experimental and Numerical Study of Discharge Capacity and Sediment Profile Upstream of Piano Key Weirs with Different Plan Geometries

Cited by 20 publications

References 17 publications

Sustainability of the coastal zone of the Ganges-Brahmaputra-Meghna delta under climatic and anthropogenic stresses

Sustainability of the coastal zone of the Ganges-Brahmaputra-Meghna delta under climatic and anthropogenic stresses

Experimental Study on the Hydraulic Performance of Porous Broad-Crested Weirs with Sloping Crests

Multi-approach assessment for predicting submerged discharge reduction factor in porous broad-crested weirs

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