Hydraulics of free overfall in smooth triangular channels

Muhsin, Karzan Abdullah; Noori, Bahzad M. A.

doi:10.1016/j.asej.2020.11.022

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…Muhsin and Noori (2021) made an essential conclusion that the main bed slope had a great influence on both (EDR) and (EDD). They presented the following expression for the variation of (𝑑 𝑒 /𝑑 𝑐 ) with the main bed slope (𝑆 𝑜 ) as: All results obtained by Muhsin and Noori (2021) were verified using the theoretical and experimental results of previous researchers prevailing well agreements. Muhsin (2021) carried out an experimental study on the flow measurement in rough triangular free end drop channels by experimenting twelve different physical models.…”

Section: Channels Of Triangular Sectionssupporting

confidence: 62%

“…They presented the following expression for the variation of (𝑑 𝑒 /𝑑 𝑐 ) with the main bed slope (𝑆 𝑜 ) as: All results obtained by Muhsin and Noori (2021) were verified using the theoretical and experimental results of previous researchers prevailing well agreements. Muhsin (2021) carried out an experimental study on the flow measurement in rough triangular free end drop channels by experimenting twelve different physical models. The models were roughened with strips of 1cm x 1cm cross sections fixed on the model sides in order to have seven patterns of strips of concentrations 0.5, 0.25, 0.125, 0.0625, 0.03125, 0.015625 and 0.0078125.…”

Section: Channels Of Triangular Sectionssupporting

confidence: 62%

“…During the experimental program, three different side slopes and four various channel bed slopes were experimented. Muhsin (2021) observed that the correlations between (𝑑 𝑒 ) and (𝑑 𝑐 ) were straight lines and values of (𝑑 𝑒 /𝑑 𝑐 ) increased with the decrease of concentration reaching a maximum value at concentration 0.125. A quadratic equation was presented for the variation of (𝑑 𝑒 /𝑑 𝑐 ) with (𝑆 𝑜 /𝑛) of the form:…”

Section: Channels Of Triangular Sectionsmentioning

confidence: 88%

“…The outcome results of the proposed model were compared with the results of previous researchers prevailing quite good agreements. Muhsin and Noori (2021) conducted an intensive laboratory study on the characteristics of free end drop in triangular channels of smooth beds via experimenting different models having various channel side slopes and different main slopes of the channel concluding that the correlations for (EDR) were straight lines relationships for all bed slopes and a wide range of (𝐹 𝑟𝑛 ) between 0.64 and 4.15. They determined the value of (EDR) = 0.804 for unconfined horizontal and smooth triangular free end drop channels of side slopes (z) = 1.0.…”

Section: Channels Of Triangular Sectionsmentioning

confidence: 99%

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Free Overfall for Discharge Measurement in Channels of Different Shapes: A Review

Jalal Mohammed,

Mohammad Ali Noori

2024

ACAD J NAWROZ UNIV

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The end drop in open channels can be considered as a simple and useful tool for the measurement of flow rates flowing in open channels of different shapes. The depth at channel end can be related to the critical depth in the approaching channel and denoted as (EDR). The (EDR) is an essential parameter for measuring end drop discharge (EDD) in open channels. The main target of this paper is to review the previous works done on the end drop in different shapes of channels using the properties of the free end drop flow as basic criteria for the estimation of (EDR) and (EDD). Useful relationships between (EDR) and channel slope are presented which are the outcome results of previous researches done on smooth and rough open channels of different shapes (rectangular, trapezoidal, circular and triangular). Moreover, the correlations of (EDD) depending on end drop depth and characteristics of the upstream approaching channel are presented for channels of different shapes for subcritical and supercritical states of flow. Still there is no unique theoretical solution for the problem of using end depth of free drop as a key for the estimation of flow rates in open channels which needs more theoretical and experimental studies and works on this important field of research.

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Section: Channels Of Triangular Sectionssupporting

confidence: 62%

Section: Channels Of Triangular Sectionssupporting

confidence: 62%

Section: Channels Of Triangular Sectionsmentioning

confidence: 88%

Section: Channels Of Triangular Sectionsmentioning

confidence: 99%

See 2 more Smart Citations

Free Overfall for Discharge Measurement in Channels of Different Shapes: A Review

Jalal Mohammed,

Mohammad Ali Noori

2024

ACAD J NAWROZ UNIV

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“…If the weir separates surface jump clear of thickness, it is called sharp crested (Subramanya, 2009). Moreover, weirs with sharp crests are extensively used as flow measuring devices in laboratories and irrigation projects especially when the flow rate discharge are limited from their resources and the farmers must pay for their water shares (Muhsin and Noori, 2021). In some cases of design, normal sharp crested weirs would not have the capacity of overpassing high flow rate discharges which can be a possible danger and threat to the adjacent private lands.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

Aaref

Noori

2021

juod

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The current research aims to get better performance and capacity of discharge of sharp crested oblique weirs by providing veins perpendicular to weir crest in order to deflect the water jet perpendicular to the weir axis. Seven weir models have been constructed and experimented in which the weir height and the oblique angle are kept constants as (P = 25cm) and (α = 40 o ), respectively, during the whole experimental work. Three oblique weir conditions are tested, the first one was testing oblique weir with no veins, while, the second condition was by providing one vein at the middle of crest length and changing vein height three times as (Pv = 25, 20 and 15cm) and the third condition studied was by providing two veins to the oblique weir. From the study of surface profiles, it was realized that the maximum X-distance for the water depth above crest to become horizontal was X = 4.93h from the center of oblique weir with no veins, while, X = 4.59h for oblique weir equipped with one vein and X = 4.93h for oblique weir equipped with two veins (h = upstream water depth above crest). The results of discharge coefficient showed that the ratio of vein height to oblique weir height (Pv/P) has a major role on increasing the discharge coefficient and it was observed that the ratio (Pv/P = 0.6) offers the best performance of the weir. A straightforward power equation is recommended for the relation of (Cd) with (h/P) for sharp crested oblique weir equipped with two veins with high correlation coefficient and low mean percentage error. The capacity of discharge of the oblique weir was increased by 69.6% for a weir equipped with one vein, while, the discharge capacity was increased up to 73.5% for a weir equipped with two veins. The limitations of this study are that testing one oblique angle and keeping the weir height as constant for the range of (h/P) between 0.08 and 0.32.

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Flow Rate Capacity Improvement of Triangular Plan Form Sharp Crested Weirs

Noori,

Aaref

2024

Arab J Sci Eng

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Hydraulics of free overfall in smooth triangular channels

Cited by 11 publications

References 16 publications

Free Overfall for Discharge Measurement in Channels of Different Shapes: A Review

Free Overfall for Discharge Measurement in Channels of Different Shapes: A Review

Performance Improvement of Sharp Crested Oblique Weirs by Using Veins

Flow Rate Capacity Improvement of Triangular Plan Form Sharp Crested Weirs

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