Instruments
Instruments
Wave Maker
The Emriver Wave Maker is a mechanical wave generator specifically designed to study coastal geomorphology in our models. A large stepper motor drives an oscillating paddle on a shaft. The Wave Maker is driven by our custom processor board giving precise control of wave stroke speed, stroke length, and pause between strokes. The controller also tallies run time and wave count. The Wave Maker is designed for ease of use and very long, maintenance-free life.
The Wavemaker can simulate a large array of processes, including longshore drift, sediment delivery from river mouths, and, with our color coded media, particle sorting by these processes.
We have wave makers sized for the Em2, Em3, and Em4.
K500 Flow Controller
The K500 is our flagship digital flow controller, and a step up from our K28 slow controller.
With its unique software and digital display, the K500:
- Provides precise measurement of flow rates from 25 ml/sec to 210 ml/sec
- Meters and displays current flow rate in milliliters/second
- Shows accumulated run time and flow in liters
- Automatically runs hydrographs
The K500 is compatible with the Em2, Em3, and Em4.
Dye Injector
Our Dye Injector system dispenses two separate colors of dye (commonly blue and green). Dye pulses can be injected at programmed intervals using the controller, or manually by pushing buttons.
Dye pulses allow for effective visualizations of water movement in the model, and also show relative depth of flow. Dye allows both flow patterns and velocity to be visualized. Use of dye is also greatly enhances the utility of photo and video documentation. The programmable controller allows for precise injection intervals that are very useful in time lapse photography.
We make dye injectors for the Em2, Em3, and Em4.
Groundwater/Rainwater System
The Groundwater/Rainwater system allows for injection and extraction of subsurface flow from the model, making possible a wide array of experiments and demonstrations. A high pressure pump supplies a spray bar at the upstream end of the table to produce groundwater flow. Extraction filters are installed at the downstream end of the table and return groundwater to the reservoir. The extraction filters have valves allowing the user to increase, decrease, or turn off groundwater extraction.
The Groundwater/Rainwater system produces parallel and uniform groundwater flow lines in the model; without it, flow must diverge from the upstream supply and converge to reach the downstream standpipe outlet. This system also allows groundwater and channel flow to be known and precisely partitioned, facilitating research on groundwater/surface water interactions.
The groundwater/rainwater system is compatible with the Em2, Em3, and Em4.
Tilting Base
Tilting bases give you the ability to adjust one or both axes of the table to simulate river processes on a greater variety of landscapes. The tilting base allows rapid changes in river valley slope and flow velocity which expand the capabilities of our models, including the study of sedimentology, delta geomorphology, and tectonic controls on river form.
A single-tilt base allows modification of the box slope. A dual-tilt base allows modification of the slope and roll. Tilting is controlled by hand cranks.
Our Em3 and Em4 stream tables are compatible with tilt bases.