The Laboratory is utilizing new, low-cost technology for measuring instantaneous water surface elevation profiles in laboratory flumes. The system currently implemented was designed, built and installed on the Kinoshita Flume. The system uses commercial off-the-shelf technology, namely several MiloneTech eTape™ liquid level sensors which rely on changes in resistance to obtain a water elevation. All sensors are hooked up to an Arduino Mega and the water surface elevation profile is continually output to screen via MATLAB.
A screenshot with example output is shown below. The instantaneous water surface is shown every 5-10 seconds and an average of the last readings is also plotted for comparison purposes. The instantaneous and historic water elevation at the location of every tape is also plotted.