Keywords : Weir
journal of kerbala university,
Volume 11, Issue 0, Pages 193-205
Gravel and Rockfill gabions are commonly used in hydraulic structures such as self-spillway dams, cofferdams, and head regulators for water distribution or other purposes. A laboratory experiments were conducted to study the influence of gravel mean size, which consists of gabion, length and height of gabion on its upstream water depth. The present study included two cases of flow regimes, through and transient flow. In this study, different gravel gabion weir models were tested in horizontal laboratory flumes of 10m length, 0.3m width, and 0.5m depth, for various weir lengths and heights using a wide range of discharges. Monosized gravel was used as filling material for the weir models. The gravel samples used in this study were three monosized gravel samples with diameters (-14+10), (-20+14), and (-25+20) mm. The results showed that for throughflow regime; upstream water depth of the gabion weir increases by decreasing the gravel mean size for the same weir length. In addition, for same gravel size, upstream water depth of the gabion increases by increasing the weir length. The results indicated that the relation between upstream water depth and unit discharge passing through gabion weir is linear for through and transient flow regimes. A positive and significant correlation was found between upstream water depth and unit discharge with an average R2of 0.99 and 0.97 for through and transient flow regimes respectively. Based on dimensional analysis concept, multiple regression analysis equations were developed for computing the upstream water depth of the gabion weir at throughflow and transition flow regimes.