Flow discharge between 2 open water bodies connected by a concrete sluice

In summary, the flow discharge between two open water bodies connected by a concrete sluice involves the transfer of water influenced by factors such as hydraulic gradient, sluice gate design, and environmental conditions. The concrete sluice facilitates controlled water movement, ensuring efficient management of water levels and ecological balance between the connected bodies. Key parameters include discharge rate, sluice dimensions, and flow dynamics, which are crucial for effective water resource management.
  • #1
krissturm
1
1
Hello,
Looking for help with a physics problem.

I am dealing with a problem regarding the flow discharge between 2 open water bodies connected by a concrete sluice with gates. The issue is that the channel is not straight but rather a trapezoid (image of the cross-section below). The discharge from 1 of the gates is said to be ~50m^3/s and the average velocity is between 3-5 m/s.

I would like to know what kind of formulas should I be looking for when dealing with such a shape. In the middle of the dike, there is a vacuum suction divide that creates a vacuum so that the water can flow freely. Additionally, a vertical axis turbine will be installed there so how should I approach the losses that the turbine will add to the flow rate?

The length from 1 basin to the other is 65m. The openings are 3.2m x 3.2m and the water level on one side is approx. -80cm NAP and on the other side approx. -30cm NAP

Picture 1.jpg
 
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  • #2
Is this a professional engineering question?
 
  • #3
Take a look at HDS5 Hydraulic Design of Highway Culverts. It's a free PDF, but be aware that at least one of the nomographs is seriously in error. Use the equations, those are correct.

Hint 1: It's under inlet control.

Hint 2: Calculate a system curve. That will tell you exactly how much head loss you can add with a turbine at your desired flow rate.
 

FAQ: Flow discharge between 2 open water bodies connected by a concrete sluice

What is flow discharge in the context of two open water bodies connected by a sluice?

Flow discharge refers to the volume of water that passes a given point in a specific period of time. In the context of two open water bodies connected by a concrete sluice, it is the rate at which water flows from one body to another through the sluice, influenced by factors such as the hydraulic gradient, sluice dimensions, and water levels in both bodies.

What factors influence flow discharge between the two water bodies?

Several factors influence flow discharge, including the difference in water levels between the two bodies (hydraulic head), the geometry of the sluice (width, height, and length), the roughness of the sluice surface, and the viscosity of the water. Additionally, environmental factors like rainfall, evaporation, and upstream inflows can also affect flow rates.

How is the flow discharge calculated for a sluice?

Flow discharge can be calculated using the formula Q = A × V, where Q is the discharge, A is the cross-sectional area of the sluice opening, and V is the velocity of the water flowing through it. The velocity can be determined using empirical equations such as the Manning's equation or the Bernoulli equation, depending on the specific conditions of the flow.

What are the implications of flow discharge for water management?

Understanding flow discharge is crucial for effective water management, as it helps in regulating water levels, maintaining ecological balance, and preventing flooding. It also aids in the design of hydraulic structures, ensuring they can handle expected flow rates and minimizing erosion or sedimentation issues downstream.

What are common challenges associated with managing flow discharge through sluices?

Common challenges include accurately predicting flow rates under varying conditions, managing sediment transport which can clog sluices, maintaining structural integrity of the sluice, and addressing ecological impacts on aquatic habitats. Additionally, fluctuations in upstream and downstream water levels due to weather events or human activities can complicate management efforts.

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