Novel Approach to Computing Critical and Normal Depth in Circular Channels

Mohammed, Akram K.; Irzooki, Raad Hoobi; Jamel, Asmaa Abdul Jabbar; Mohammed-Ali, Wesam S.; Abbas, Suhad S.

doi:10.18280/mmep.080611

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The operating flume as well as the experimental equipment are shown in Figure 2. The critical depth in semicircular channel was calculated using the following empirical equation that was proposed by (Mohammed, et al, 2021) [20]:…”

Section: Experimental Workmentioning

confidence: 99%

Experimental Investigation for Free Overfall of Flow in Semi-circular Channels

Irzooki

Najem²

2022

IOP Conf. Ser.: Earth Environ. Sci.

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In the present paper, the effects of diameter, bed slopes, and bed roughness on free overfall flow of semi-circular channels were investigated experimentally. For this purpose, three models of semi-circular channels with free overfall were built and installed in a 6m long laboratory flume. These three models were 250 cm long and had varying diameters 160, 200, and 250 mm. Four different bed slopes (S) were used in each of these models (0, 0.004, 0.008, and 0.012). For each bed slope, three sand particle sizes were used to roughen the bed (1.18mm, 2.36mm, and 4.75mm). For each model, the experimental testing program contained sixteen series of experiments. They were divided into two categories: four smooth beds and twelve rough beds. Different rates of discharge (Q) were examined in a total of 192 tests. According to the experimental results of all models, the Froude number (F r ) of flow decreases as the end depth ratio ( y b / y c ) increases for various bed roughnesses. For varying bed slopes and bottom roughness, a simple linear formula was developed to relate the brink depth ( y b ) with the critical depth ( y c ). For various bed slopes and roughness conditions, simple empirical equations for the flow over the free overfall in semi-circular channels were found. The results demonstrate a good level of agreement.

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Section: Experimental Workmentioning

confidence: 99%

Experimental Investigation for Free Overfall of Flow in Semi-circular Channels

Irzooki

Najem²

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Geo-Studio is one the advanced software that has been developed based on the finite element methods to analyze different seepage and slope stability problems. Specifically, SEEP/W model, which is one of the Geo-Studio models, has been an effective tool to determine the flow lines, quantity of seepage, pore water pressure, and hydraulic gradient of flow [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Seepage Problem Through the Foundation of a Spillway with Selected Treatment Methods

Mahmood¹,

Alboresha²,

Sulaiman³

et al. 2022

MMEP

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One of the main concerns for engineers, during operation of dams, is uncontrolled seepage though the foundations of dams and hydraulic structures which is mainly resulted from poor geological conditions and lead to undermine erosion or piping that may endanger the safety of dam. In this study, numerical models were utilized to evaluate the excessive seepage problem underneath the spillway of Horan 2 Dam in Iraq as the seepage have led to dissipate storge and malfunction the dam. Two treatment methods were proposed to reduce the quantity of seepage by using a cutoff wall and a clay blanket. The results of the models indicated that the foundation of the spillway was unsafe against piping, as the calculated factor of safety was less than the allowable value. A clay blanket of 6 m long is recommended to sufficiently reduce the quantity of seepage and maintain the factor of safety within the allowable limits. As the cut off wall and clay blanket were used, the quantity of seepage decreased up to 73% and 96%, respectively, and the safety factor increased up to 100% and 110%, respectively. As discussed herein, using a clay blanket is the most cost-effective method comparing to using a cutoff wall.

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Novel Approach to Computing Critical and Normal Depth in Circular Channels

Cited by 2 publications

References 11 publications

Experimental Investigation for Free Overfall of Flow in Semi-circular Channels

Experimental Investigation for Free Overfall of Flow in Semi-circular Channels

Seepage Problem Through the Foundation of a Spillway with Selected Treatment Methods

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