The Effect of Check Dam Stones Installation and Gabions with Combination Variations in River Bends Using a Laboratory Model Test

Abstract

Scour or landslide has been a frequent problem at river bends. The common protection for this area is an installation of check dam stones at 90° and gabions at 45° at the outer cliffs of the channel. This study aims at determining the effect of variations in the placement of check dam stones and gabions on river bends through an experimental test of the hydraulic model. It used a river model flume with a curve length of 5 m, a width of 0.8 m, a height of 0.5 m, and a constant flow rate of 7.07 lt/sec. Variation of placement was done twice with the first variation of 3 check dam stones, 4 gabions, 3 check dam stones, and the second variation of 3 gabions, 4 check dam stones, 3 gabions. The test results showed that the scour in variation 1 for STA 01 was -0.8 cm, STA 11 was -0.4 cm, STA 19 was -2.3 cm, respectively. The analysis results indicate that it is effective to use check dam stones for STA 00 to STA 07, gabions for STA 08 to STA 17, but STA 18 to STA 24 is not effective using check dam stones.