Summary with 6 pipe diameters

A summary is given of some graphs for pipe diameters of 1 inch, 2 inch, 4 inch, 8 inch, 0.4 m and 0.8 m. These graphs are:

  1. The Relative Excess Hydraulic Gradient for constant spatial volumetric concentration curves of 17.5% for uniform sands and gravels.
  2. The Relative Excess Hydraulic Gradient for constant transport volumetric concentration curves of 17.5% for uniform sands and gravels.
  3. The Limit Deposit Velocity for uniform sands and gravels.
  4. The Durand Froude number for the limit deposit velocity for uniform sands and gravels.
  5. The Bed Height and Slip Factor for uniform sands and gravels.
  6. The Relative Excess Hydraulic Gradient for both constant spatial (A) and transport (B) volumetric concentration curves of 17.5% for graded sands and gravels for a 1 mm particle d50.
  7. The Bed Height and Slip Factor for graded sands and gravels for a 1 mm particle d50.
  8. A comparison of 12 models based on the transition velocity between the heterogeneous and the homogeneous regime.
  9. A comparison of 22 models based on the Relative Excess Hydraulic Gradient.
  10. A comparison of Heterogeneous models based on the Relative Excess Hydraulic Gradient.

Material from this website is free to use, but if you use it in a publication or report please add the following reference:
Miedema, S.A., "The Delft Head Loss & Limit Deposit Velocity Model". www.dredgingengineering.com. Delft, The Netherlands, 2012-now.



   01 The Relative Excess Hydraulic Gradient, Cvs, Uniform Sands & Gravels

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a constant spatial volumetric concentration of 17.5%.

Uniform Sands & Gravels.


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   02 The Relative Excess Hydraulic Gradient, Cvt, Uniform Sands & Gravels

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a constant transport volumetric concentration of 17.5%.

Uniform Sands & Gravels.


>> Read more

   03 The Limit Deposit Velocity, Uniform Sands & Gravels

The Limit Deposit Velocity versus the Particle Diameter for different  spatial volumetric concentrations.

Uniform Sands & Gravels.


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   04 The Durand Froude number FL for the Limit Deposit Velocity, Uniform Sands & Gravels

The Durand Froude number FL versus the Particle Diameter for different  spatial volumetric concentrations.

Uniform Sands & Gravels.


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   05 The Bed Height & Slip Factor, Uniform Sands & Gravels

The Bed Height & Slip Factor for different  Particle Diameters.

Uniform Sands & Gravels.


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   06A The Relative Excess Hydraulic Gradient, Graded Sands & Gravels, Cvs

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a 17.5% Spatial or transport volumetric concentration.

Graded Sands & Gravels.


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   06B The Relative Excess Hydraulic Gradient, Graded Sands & Gravels, Cvt

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a 17.5% Spatial or transport volumetric concentration.

Graded Sands & Gravels.


>> Read more

   07 The Bed Height & Slip Factor, Graded Sands & Gravels

The Bed Height & Slip Factor versus the Line Speed for a 17.5% Spatial or transport volumetric concentration.

Graded Sands & Gravels.


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   08 Comparing 12 Models based on the transition heterogeneous-homogeneous

The Transition Velocity Heterogeneous-Homogeneous versus the Particle Diameter for a constant spatial volumetric concentration of 17.5%.

Some Uniform Sands & Gravels, Others Graded Sands & Gravels.


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   09 Comparing 22 Models based on the Relative Excess Hydraulic Gradient

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a constant spatial volumetric concentration of 17.5%.

Some Uniform Sands & Gravels, Others Graded Sands & Gravels.


>> Read more

   10 Comparing Heterogeneous Models based on the Relative Excess Hydraulic Gradient

The Relative Excess Hydraulic Gradient versus the Hydraulic Gradient for a constant spatial volumetric concentration of 17.5%.

Some Uniform Sands & Gravels, Others Graded Sands & Gravels.


>> Read more



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