Gate Lip Hydraulics under Sluice Gate

Abstract

This paper present the effect of the lower gate lip on the coefficient of contraction, velocity and discharge which have been made in a rectangular flume with four gates opening from (2 to 4.5) cm, five different discharges from (6.2 to 18.15) l/s and five different gate cases (vertical and inclined vertically) by angle (45)˚ with and opposite flow direction with horizontal and sharp lower lip. The values of coefficients of contraction (C c) and discharge (C d) increases when gate slope increases with flow direction and the lower lip is horizontal, these increases are (16)% and (18)% respectively, while these values decreases when gate slope increases opposite flow direction and the lower lip is horizontal these decreases are (13)% and (11)% respectively. The values of coefficient of velocity (C v) remain constant and don't effect with changes of gate slope or gate lip.

Hydraulic Properties Downstream Multi-Opened Sluice Gate

“…The value of the discharge coefficient (Cd) decreases by increasing the water level at the upstream of the gate, where it was the lowest possible at the level (35) cm, and the highest possible at the level (15) cm, because lowering the water level upstream of the gate means less discharge passing through it, thus increasing the value of the discharge coefficient (Cd) and vice versa, as in Figure 15) cm, because at the high depths, the discharge is high as well as the average velocity is high and Fr1 is high too and therefore a lower value for (Cc) as shown in Figure (6).…”

“…Whereas, the nonlinear equation performed better than the linear equation. Mohammad and Khalil [6] tested the effect of five states on the level of the lower edge of one-open gate and the angle of the gate slope on contraction, discharge, and velocity coefficients, for different discharges and a variable gate opening, they concluded that the value of both contraction coefficient (Cc) and discharge coefficient (Cd) increase with increasing slope of the gate towards the direction of flow and at the horizontal edge level, and it decreased with the slope of the gate against the flow direction with horizontal plane of the lower edge. The study showed that velocity coefficient (Cv) was not affected and its value remained constant.…”

Laboratory Study of Flow Characteristics Through three Baffle – Sluice Gates.

“…(9&10) shows that the value of discharge coefficient Cd decreases with the increase of , and its value increases with the increase distance between baffles. Comparing figure (9) with figure (10) it can be noted that the channel slope has a negative effect on the value of Cd which shows less values of discharge coefficient Cd for the same geometric combinations.…”

“…Lin, et al, (2002) presents a theoretical formula and some experimental graphs to determine maximum allowable tail water depth for free flow (or minimum allowable tail water depth for submerged flow). The effect of lower gate edge on water surface profile has been studied in rectangular flume by (Mohammed & Khaleel, 2013).The discharge coefficient for the free flow through three baffle sluice gates in horizontal and inclined channel was investigated in this study.…”

Analisis Stabilitas Desain Bendung Pada Gerbang Radial Sungai Parit (Studi Kasus Banjir Rob di Kawunganten-Cilacap Jawa Tengah)

“…Berdasarkan hal di atas, maka salah satu alternatif yang dapat dilakukan adalah pembangunan suatu bendung gerak sebagai pengendali banjir tampungan air di musim hujan dan dapat digunakan secara efisien di musim kemarau (Kamiana, 2011). Tersedianya bangunan Bendung Gerak Radial Gate Sungai Parit tersebut diharapkan dapat mengurangi bencana banjir di wilayah Kecamatan Kawunganten dan sekitarnya, serta secara tidak langsung akan meningkatkan taraf hidup masyarakat setempat (Mohammed, Y., Khaleel, & S, 2013).…”