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New research flumes available as standard
Laboratory Flumes and Channels for Hydraulic Teaching and Research Studies
Standard Flumes
Special Flumes, Tanks and Basins
Mono and Random Wave Makers
Ancillary Equipment
Sediment Transport Facilities.
A simple and robust system for the measurement and recording of water wave profiles, which uses the principle of measuring the electrical conductivity between two parallel wires. Each probe consists of a pair of stainless steel wires which dip into the water waves. The electrical conductivity between them is measured, and is linearly related to their depth of immersion hence to wave height. The method is free of meniscus and `wetting effects.
The system is available in 1, 2 or 3 channel form and can display data by high speed recorder or input to a data logger. Alternative lengths of probe are 300mm or 500mm.
The probe consists of two 1.5mm diameter stainless steel wires spaced 12.5mm apart and 300mm long or 500mm long as required. Each probe is connected to its own wave monitor module in the electronic console by a twin core flexible cable 10m long. The distance between the console and probe may be increased up to 100m using commonly available low current cables.
Energization is conducted by means of an audio frequency drive signal which avoids all polarization effects at the wire interface. The signal is balanced relative to earth, to render the system immune to common mode voltages between the water and instrument earth. The frequency can be altered to permit two or more sensors to operate in close proximity without mutual interference.
The power supply module and appropriate number of wave monitor modules are mounted in a console, finished in matte textured blue paint and fitted with four rubber feet and carrying handle.
The result is a system giving high dynamic accuracy over a wide range of wave heights and frequencies.
The tank is manufactured from glass reinforced plastic and all components in contact with water are of non-corroding materials.
A self contained recirculating water tank for flow visualisation and mobile bed studies.
All controls are housed in a portable console which includes a flexible cable and water safe connectors.
Fifteen models and accessories are included as standard and a sheet of coloured glass allows rapid changeover from mobile bed to flow visualisation mode.
The working section has minimum dimensions of 2m(4m) x 610mm and the flow range is 0-3.5 litres/sec.
The equipment is self-contained and may be bench-mounted in either the classroom or laboratory by virtue of its portability.
A model undershot weir and bridge pier are included for local erosion demonstrations.
A transparent, inclinable flow channel through which water can be re-circulated by a pump over a mobile bed to demonstrate the whole range of bedforms from incipient particle movement to bed wash-out.
The working section of the channel is 1.55m long, 78mm wide and 110mm deep.
A water level gauge is supplied to calibrate the overshot weir.
Three different discharge rates can be selected (and measured) within the range 0.2 to 0.6 litres/sec.
The channel slope can be adjusted within the range 0-10%.
Description:
The unit consists of an inclinable channel mounted on a frame, together with a discharge tank and recirculating pump. The channel slope is adjusted by means of a fine screw jack to which an accurate slope indicator is attached. To commence a demonstration, sand is placed evenly along the channel bed, between the inlet tank and the overfall discharge weir. The channel sides are transparent in order that bed profile changes can be observed, and a section of one side is provided with graphical grid markings to permit quantitative assessments to be made of bedform dynamics. Water is circulated around the system at one of the three selectable flow rates.
An insulated gold electrode terminates 0.1mm from the tip of the rotating blades and detects the change in electrical impedance as each blade passes. The sensing head consists of a 5-bladed propeller that runs in jewelled bearings. As there is no physical contact between the electrode and blade, the propeller can rotate freely and respond to low velocity of the surrounding fluid. The propeller is able to rotate freely within a protective shrouded cage.
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Suitable for both laboratory and field applications battery powered (rechargeble) and fully portable Measurements are indicated on the digital and may be connected to a data logger for later analysis. Propeller Velocity Flowmeter Measurement of velocities in clean conductive fluids within the range 25 to 1500mm/sec (up to 3000mm/sec with high speed probe) Operation in confined spaces with limited intrusive effects.
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A unit designed to obtain catchment rainfall and runoff values as functions of time.
A motor driven traversing vessel with seventeen compartments is moved by timer beneath the outlet at a preselected rate to collect the runoff and provide an immediate display of the hydrograph.
Comprising a bench- or floor-standing tank with two overhead square pattern spray nozzles supplying water via a flow control valve, flow meter and solenoid valve.
The flow range is 0.4 to 4.4 litres/minute.
A comprehensive user manual is included in the supply.
The tank is 1.2m in length x 0.8m wide x 0.2m deep.
A mounting tripod constructed from aluminium alloy is supported on three stainless steel rods secured by thumbscrews. The rods are adjustable allowing the stand to be made level.
An adjustable mounting tripod constructed from aluminium alloy, supported by three stainless steel rods secured by thumbscrews. For use with Hook & Point Gauges and Pitot Tubes.
The whole assembly may be adjusted for height on the support rods. A carrier plate mounted on the tripod supports the gauge.
Levelling is assisted by use of a Bullseye spirit level mounted on the top plate.
A steel point or hook is attached to the bottom end of the shaft and is used to locate the water surface.
A quick-release mechanism permits large changes to be rapidly accommodated, and a screw adjustment is provided for accurate final positioning.
A push button sets the display to zero at any position, so that relative movements compared with a datum can be easily measured.
The gauging unit consists of a liquid crystal electronic display, which indicates the movements of the shaft.
This gauge is easy to use and minimises potential errors resulting from reading vernier scales.
A mounting plate is clamped to a suitable support structure and a flat vertical shaft retained by the gauging unit is free to slide up and down over the water surface.
The sides of the tank are supported and sealed by a well proven method which allows free access to the interior and results in minimum sight obstruction. The bed of the tank is made from painted mild steel. The ends of the tank are made of steel plate. One side is of toughened glass to give good scratch-free visibility over a long period of use while the other is made of aluminium which permits the insertion of pressure tapping points as required.
The equipment is self-contained, requiring only an initial fill with cold water and connection to the electricity supply. The sump tank can be emptied to a laboratory drain. These may be lowered to a position close to the bed of the tank for some experiments to provide sub-soil drainage. Adjustable overflows are provided close to each end of the tank so that constant water levels may be maintained in each half of the tank.
Camera
Super-sensitive VGA CMOS sensor:
75 - 110 dB dynamic range;
4.8 V/lux·sec sensitivity.
640 480, 6.0 µm pixels (1/3 format);
~50% quantum efficiency at 660 nm;
Trigger input enables image pair acquisition to be synchronised with external events.
Accepts standard CS- or C-mount lenses (12.5mm f/1.4 lens supplied).
Camera exposure can be linked to the lasers pulsing, thereby enabling operation in a lit room.
Laser
Solid-state air- cooled 200 mW, 660 nm laser diode (Class 3b).
Standard optics produce a c. 3 mm thick, 45° light sheet (c. 200 mm wide at 250 mm).
Interchangeable 20° light sheet optic available (item H41-3).
Pulse separation (t) of between 100 µs - 5 s (in steps of 10 µs).
Pulse width of between 10 µs - 32 ms (in steps of 10 µs).
Based On:
User-supplied velocity limits;
RMS of neighbouring vectors values.
Calculation of the following derived scalars:
Vector angle and magnitude;
Vorticity and swirl;
Time-averaged mean velocity;
RMS and turbulence intensity.
Where applicable, vector component and statistical sample number are user-defined.
Software Processing
Data refresh and recording rate up to 16Hz (dependent on the computer speed, the selected acquisition and PIV analysis parameters and the recording taking place)
Real-time, or offline, 2-component vector calculation.
Single pass or adaptive multi-pass cross-correlation with 8, 12, 16, 24, 32 or 64 pixel window sizes.
0% or 50% window overlap (i.e. maps of up to 19,000 vectors).
Optional vector interpolation and filtering.
The water is output either from an outlet tank and flow measurement system located at the end of the main sand tank, from one or both of the two wells located in the tank, or one or both of the French drains. The unit comprises a sand tank, made of stainless steel, measuring 2 meters by 1 meter. A large plastic sump tank is located under the sand tank. Water may be input to the sand tank from spray nozzles located above the tank (simulating rainfall), from an inlet tank simulating a river flow or from two french drains buried in the sand at either end of the tank.
Capabilities:
Hydraulic gradients in ground water flow .Investigation of model stream flow in alluvial material
Determination of run-off hydrographs from model catchments including multiple storms, moving storms, effect of reservoir storage and land drains
Sediment transport, bed load motion, scour and erosion
Formation of river features and development over time
Construction of draw-down curves for one or two well systems in a sand bed.
Features:
Stilled inlet tank provides developed river flow conditions, allowing the full length of the tank to be used for river simulations
Control and measurement of inlet flows
Flexible configuration allows a wide range of simulations
Flexible configuration allows a wide range of simulations
Novel outlet tank design for water flow and sediment flow measurement
Stainless steel sand tank
Dual jacks provide adjustable tilt
Use of fine grade sand allows detailed feature development
Adjustable spray nozzle height
Computer data logging option for sediment and water outlet flow measurement.
Single grade of sand for all defined demonstrations, no need to change the sand.
A glass sided tilting flume with fabricated all stainless steel bed. Completely self-contained and comprising the working section, moulded inlet and discharge tanks, a series of sump tanks, a pump, an electronic flow meter, a jacking system and a control console. The channel section is fully glazed with large clear panels of toughened glass. A working cross-section of 300mm wide by 450mm deep and available in standard working lengths of 5m, 7.5m, 10m, & 15m. Longer lengths are available to special order in increments of 2.5m. The glass panels are sealed using a rubber section compressed by an aluminum alloy clamping strip. The flume bed is manufactured to high tolerances and designed with an integral web support frame to give the flume a high degree of rigidity and stability. This is coupled with careful design of the side support profiles to provide excellent visibility and allow flow visualization of the full working height of the flume. No under frame or support structure other than jacks is necessary. Rigid dowelled joints are used to connect the sections. The overall strength and rigidity of the design allows excellent stability figures to be achieved and eliminates the need to provide adjusting screws or to perform periodic setting up of the flume to maintain its specification.
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A self-contained river flow simulator for the study and visualization of river formations, bed load studies and fluvial geomorphology
Tank mounted on a steel frame with jacking system to easily and safely adjust the tank slope while fully loaded
Uses sand as the media for detailed feature development and bed load motion studies
Stainless steel tank with a 2150mm x 900mm working area
Water reservoir, submersible pump, variable area flow meter and control valve giving flows from 1.5 to 15l/min
Water inlet vessel with stilling can be positioned anywhere in the tank
Supplied with comprehensive instruction manual.
Features:
Sturdy frame with dual jacks to vary slope
Stilled water inlet vessel, featuring variable positioning
Robust stainless steel tank
Variable flow, with flow meter
Uses sand for realistic and highly detailed feature formation
Self-contained, includes pump and water reservoir
Variable height exit.
A range of manometers measuring differential water pressures up to approximately 12.5m H2O. Scales are graduated in 1mm divisions.
1 meter scale differential pressurized water manometer (the air space above the tubes can be pressurized with the pump supplied)
1 meter scale differential open water manometer
1 meter scale differential water over Mercury manometer
500mm scale differential kerosene over water manometer
500mm scale differential water over Mercury manometer
A stainless steel hook or point is attached to the bottom end of the rod and is used to locate the water surface. A mounting frame is clamped to a suitable support structure and a gauging rod is free to slide up and down over the water surface.
Capabilities:
Measurement of slowly changing water levels in flumes and hydraulic models.
Location of air-water surface boundaries with high resolution.
Measurement of mechanical deformation.
