If the gate opening is equal or greater than the critical water depth,
no hydraulic jump would occur
, and the gate will not able to regulate the flow in that case (Yen et al.
How is critical depth affected by flow rate?
Critical depth is a
quantity of fundamental importance to understanding the flow characteristics
. If the actual depth is greater than critical depth, then the flow is considered “subcritical”. Subcritical flow is “slow flow” and is impacted by downstream conditions.
Why is critical depth important?
Critical depth is an important value in hydraulic analysis
because it is a control in reaches of non-uniform flow whenever the flow changes from subcritical to supercritical
.
When the depth of flow is greater than the flow is called subcritical?
Subcritical
occurs when the actual water depth is greater than critical depth. Subcritical flow is dominated by gravitational forces and behaves in a slow or stable way. It is defined as having a Froude number less than one. Supercritical flow is dominated by inertial forces and behaves as rapid or unstable flow.
Why the pressure distribution along the surface of the sluice gate is not hydrostatic?
The pressure distribution on the gate cannot he hydrostatic, as
the pressure must be atmospheric at both the upstream water level and at tile point where the jet springs clear of the gate
. i. To determine the discharge beneath the sluice gate.
How do you find critical depth?
The critical depth for a rectangular channel can be calculated
from the fact that the Froude number is equal to one at critical flow conditions
. For a rectangular channel , this fact leads to the equation: Vc/(gyc)1/2 = 1, where the subscript c is used to indicate critical flow conditions for the velocity and depth.
What is the difference between compensation depth and critical depth?
In Sverdrup’s words, the compensation depth is defined as the depth at which the energy intensity is such that the production by photosynthesis balances destruction by respiration. The critical depth is
the depth above which daily integrated net production is zero
.
What is critical depth formula?
The governing equation for critical depth computation is
[1](1) Q 2 g = A 3 B
, where is the discharge given to compute the corresponding critical depth, is the gravitational acceleration, is the cross section area, and is the top width at the water surface.
When the depth is normal which parameter is zero?
When the depth is normal, which parameter is zero? Explanation: Normal depth is
a depth of flow in the channel
. It is created when the slope of the water surface and channel bottom is the same and the water depth remains the same throughout the entire flow.
How do you calculate critical depth of flow?
VT gA = • F, = 1
Thus, when the specific energy is minimum for a given discharge flow will be critical flow and depth of flow will be called as critical depth of flow (y) and velocity of flow will be called as critical velocity.
What is normal depth of flow?
Normal depth is the depth of flow in a channel or culvert when
the slope of the water surface and channel bottom is the same
and the water depth remains constant. Normal depth occurs when gravitational force of the water is equal to the friction drag along the culvert and there is no acceleration of flow.
When the Mach number is more than 6 the flow is called?
(d) When the Mach number is more than 6, the flow is called
hypersonic flow
.
Is Froude number dimensionless?
Froude number (Fr), in hydrology and fluid mechanics,
dimensionless quantity used
to indicate the influence of gravity on fluid motion.
How do sluice gates work?
Sluice gates
open to let water flow in during the rising tide and then close with the returning tide as water is directed through
a standard hydroturbine.
What is the main effect of a sluice gate as a channel control?
A sluice gate is traditionally a wooden or metal plate which slides in grooves in the sides of the channel. Sluice gates are commonly used to
control water levels and flow rates in rivers and canals
.
How does hydrostatic pressure work?
Hydrostatic pressure is the pressure that
is exerted by a fluid at equilibrium at a given point within the fluid
, due to the force of gravity. … The more dense the fluid above it, the more pressure is exerted on the object that is submerged, due to the weight of the fluid.
