Hydraulic Characteristics of Gabion-Stepped Weirs

by Chaiyuth Chinnarasri, (corresponding author), Assoc. Prof.; Water Resour. Engrg. Res. Lab. (WAREE), Dept. of Civ. Engrg., King Mongkut's Univ. of Technol. Thonburi, Bangkok 10140, Thailand, chaiyuth.shi@kmutt.ac.th,
Somchai Donjadee, Lectuer; Dept. of Irrigation Engrg., Kasetsart Univ., Kampaeng Saen Campus, Nakorn Pathom 71340, Thailand., t_donjadee@yahoo.com,
Udomsak Israngkura, Asst. Prof.; Dept. of Civ. Engrg., King Mongkut's Univ. of Technol. Thonburi, Bangkok 10140, Thailand., udomsak.isr@kmutt.ac.th,

Serial Information: Issue 8, Pg. 1147-1152

Document Type: Journal Paper

Closure: (See full record)
Discussion: Tatewar Sandip P. (See full record)

Abstract: Experimental studies on the hydraulics of flow through and over gabion-stepped weirs are presented. Two flow components were observed, i.e., base flow through the void between filled stones and overflow on the gabions. The energy loss ratios in the gabion-stepped weirs are greater than those in the corresponding horizontal stepped weirs by approximately 7, 10, and 14% for weir slopes of 30, 45, and 60°, respectively. As a result, the velocity at the outlet is lower. Stone size and shape have little influence on the energy loss and flow velocity as compared to the increasing effect of the weir slope. The pressure acting on the step face for the gabion-stepped weirs is less than that of the horizontal steps owing to the cushioning effect generated by filled stones. To reduce pressure on a step face at a fixed discharge for different weir slopes, the void ratio of the filled stones should be low to allow a small amount of base flow. The pressure distribution pattern on the horizontal face of a step is provided.

Subject Headings: Hydraulics | Weirs | Stones | Base flow | Slopes | Pressure distribution | Energy loss | Voids |

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