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Products  |  Fluid Mechanics  |  Hydraulics for Civil Engineering  |  HM 140
HM 140 Open-Channel Sediment Transport Show data sheet (pdf file) Print page
Technical Description

  HM 140 uses sand as an example to demonstrate important phenomena of bed-load transport in the area near the bottom. Open-channel flow without sediment transport is also possible. Discharge can be subcritical or supercritical.
  The core element of the HM 140 experimental flume with closed water circuit is the inclining experimental section. The side walls of the experimental section are made of tempered glass, which allows excellent observation of the experiments. All components that come into contact with water are made of corrosion-resistant materials (stainless steel, glass reinforced plastic). The inlet element is designed so that the flow enters the experimental section with very little turbulence and no sediment can flow back. The tank after the water outlet contains a sediment trap for coarse sand.
  The inclination of the experimental flume can be finely adjusted to produce slope and to create a uniform flow at a constant discharge depth.
  In addition to bed-load transport in open channels, some models can also be used to observe fluvial obstacle marks, namely scour formation and siltation at structures. A rounded-nosed pier, a broad-crested weir or a sluice gate can be inserted into the experimental section.
  The discharge is measured via a measuring weir in the water outlet and a level gauge. The level gauge is also used for profile measurement in the sediment and to determine the discharge depth at each point of the experimental section.

  Ink can be injected as a contrast medium to visualise the flow conditions.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- bed-load transport in open channels
  * subcritical and supercritical flow
  * formation of ripples, dunes and antidunes
- how flow velocity affects bed-load transport
- fluvial obstacle mark (siltation/scour formation)
  * bridge pier
  * sluice gate
- bed-load transport formulae
  * Meyer-Peter and Müller formula
  * Einstein's formula
  * determining the transport rate
- visualisation of the flow

- open-channel flow without sediment transport
  * subcritical and supercritical flow
  * control structures: sluice gate, broad-crested weir
  * discharge measurement on the sharp-crested



* Flow in an inclinable flume with and without

  bed-load transport1
* Subcritical and supercritical flow1
* Visualisation of flow with contrast medium

Alternative products
HM 160 -- Experimental Flume 86x300mm
HM 166 -- Fundamentals of Sediment Transport
HM 168 -- Sediment Transport in River Courses
Fundamentals of Sediment Transport

[1] investigation of open-channel flow with and without bed-load transport
[2] experimental flume, consisting of experimental section, inlet element, water outlet and closed water circuit
[3] smoothly adjustable inclination of the experimental section
[4] side walls of the experimental section are made of tempered glass for excellent observation of the experiments
[5] all surfaces in contact with water are made of corrosion-resistant materials
[6] flow-optimized inlet element for low-turbulence entry to the experimental section; inlet element with sediment trap to prevent sediment flowing back
[7] closed water circuit with water tank with sediment trap for coarse sand, pump and manual flow rate adjustment
[8] sluice gate, bridge pier and broad-crested weir for experiments with and without sediment transport
[9] visualisation of the flow using ink as a contrast medium
[10] discharge measurement via measuring weir in the water drain
[11] level gauge for measuring the discharge depth and the height of the sediment surface


Technical Data

Experimental section
- length: 1.600mm
- flow cross-section WxH: 300x86mm
- inclination adjustment: -1...+3%
Tank: 280L
- power consumption: 1,02kW
- max. flow rate: 22,5m³/h
- max. head: 13,7m
Sediment trap filter element: 49mesh


Dimensions and Weight
LxWxH: 3.000x660x1.600mm
Weight: approx. 215kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Sediment: coarse sand (>0,63mm grain size)
Scope of Delivery
1 experimental flume
1 sluice gate, 1 rounded-nosed pier, 1 broad-crested weir, 1 system for flow visualisation, 1 level gauge, 1 tool for smoothing sand
1 set of instructional material
Order Details

070.14000  HM 140  Open-Channel Sediment


© 2005 G.U.N.T. Gerätebau GmbH