Non-Linear Scour Calculator of Skewed Piers
M. A. Nassar

M. A. Nassar, Associate professor, Dep. of Construction Eng., College of Eng. in Al-Qunfudhah, Umm Al-Qura University, KSA, on leave from Water Eng. and Water Structures Dep., Faculty of Eng., Zagazig University, Egypt.

Manuscript received on January 18, 2020. | Revised Manuscript received on January 23, 2020. | Manuscript published on February 10, 2020. | PP: 1147-1155 | Volume-9 Issue-4, February 2020. | Retrieval Number: B6705129219/2020©BEIESP | DOI: 10.35940/ijitee.B6705.029420
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Abstract: This paper investigates the impact of skewed piers and their geometrical shape on the scouring. A non-linear equation estimating scour depths around skewed piers (i.e. Piers Scour Calculator PSC) is established experimentally. The rectangular, semicircle and curvilinear piers are investigated. PSC Eq. gives reasonable values compared to formulas of Froechlich (1988), Chitale (1962), Ahmad (1962) and Inglis-Poona (1949). RSQ values equal 92.5%, 83.5% of the training and validating data, respectively. PSC results are convenient with measurements compared to equations of (Richardson & Davis, 2001) and (Melville & Sutherland, 1988). The experimental results showed that values of the scouring parameter 𝒅𝒔 𝒚𝟑 increase by 200%, 270% and 238% for the rectangular, the semicircle, and the curvilinear piers, respectively as the skewed angle increases from 0o to 16.7o . Two empirical equations presenting flow angles and shape factors are developed. 
Keywords: Skewed, Scour, Erosion, Equation and Piers.
Scope of the Article:  Natural Language Processing