Investigating the Effects of the Block Geometries and Sidewall Divergences on the Local Scour Downstream of Baffled Chute Spillways

Joint Authors

Karimi Chahartaghi, Morteza
Nazari, Sohrab
Babarsad, Mohsen Solimani

Source

Advances in Civil Engineering

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-10-15

Country of Publication

Egypt

No. of Pages

14

Main Subjects

Civil Engineering

Abstract EN

Due to the lack of any specific study about the sidewalls and other blocks’ changes in the case of hydraulic and scour downstream, the present study was conducted to investigate this issue.

For this purpose, drainage projects and spillway chutes, as well as many baffle block chutes, were designed and constructed with the parallel sidewalls and trapezoidal shape using the U.S.

Bureau of Reclamation (USBR) instructions.

Three divergence ratios of b1/b2=1.45,1.75, and 2.45, a parallel sidewall of b1/b2=1, and also three geometry blocks including trapezoidal USBR, trihedral, and semicircle blocks were applied and tested in the hydraulic laboratory using a baffle chute with the slope of (2 : 1), (H : V).

The material used in this study was sediment sand with a uniform grain size of d50 = 1.2 mm, 15 cm of thickness, and 2 m of length.

The experiment was conducted with seven different discharges in lasting condition, and the flow characteristic and scour hole dimensions were measured.

The results revealed that in comparison with the USBR blocks, changes in the baffle sidewall and block shape made an approximate 50% reduction in the maximum depth of the scour hole.

Thus, increasing the divergence ratio from 1 to 2.45 had a significant effect on reducing the maximum depth and the topographic shape of the scour hole.

According to the range mentioned in the literature for the Weber number, the scale effect was negligible for the chute with baffle blocks.

Generally, it can be concluded that the sidewall changes also can make a reduction in the number of overbaffle blocks, causing a reduction in the construction cost.

American Psychological Association (APA)

Karimi Chahartaghi, Morteza& Nazari, Sohrab& Babarsad, Mohsen Solimani. 2020. Investigating the Effects of the Block Geometries and Sidewall Divergences on the Local Scour Downstream of Baffled Chute Spillways. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1121227

Modern Language Association (MLA)

Karimi Chahartaghi, Morteza…[et al.]. Investigating the Effects of the Block Geometries and Sidewall Divergences on the Local Scour Downstream of Baffled Chute Spillways. Advances in Civil Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1121227

American Medical Association (AMA)

Karimi Chahartaghi, Morteza& Nazari, Sohrab& Babarsad, Mohsen Solimani. Investigating the Effects of the Block Geometries and Sidewall Divergences on the Local Scour Downstream of Baffled Chute Spillways. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1121227

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1121227