University of California, Davis: 2020 Lake Tahoe Clarity Report
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Photo from UC Davis TERC
Lakes are always in motion. Whether you re kayaking, paddleboarding or simply floating, you may have felt currents or seen waves moving across the surface. Are these motions important for lake health? Surprisingly these specific motions have little effect on the biota, the clarity, or the water quality. The motions that really matter are the tiniest motions, known as turbulence.
Turbulence:
Transports oxygen into the sediments
Allows clarity-impeding fine particles to aggregate together and settle quicker
What do we know about turbulence in Lake Tahoe? Actually, very little.
Although some of the earliest lake turbulence measurements were done in the 1970s at Lake Tahoe, little has been done since then. One reason is that these minute motions are difficult to measure and the necessary equipment is expensive and fragile. Measurements need to be made continuously every 1/100th of a second and be able to resolve temperature changes of 1/1000th of a degree.