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RELATIONSHIPS BETWEEN WIND VELOCITY AND UNDERWATER IRRADIANCE IN A SHALLOW LAKE (LAKE OKEECHOBEE, FLORIDA, USA) 1
Author(s) -
Hanlon Charles G.,
Miller R. L.,
McPherson B. F.
Publication year - 1998
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1998.tb01528.x
Subject(s) - irradiance , wind speed , environmental science , sediment , hydrology (agriculture) , underwater , magnitude (astronomy) , atmospheric sciences , oceanography , geology , geomorphology , physics , geotechnical engineering , quantum mechanics , astronomy
Relationships between wind velocity and the vertical light attenuation coefficient (K 0 ) were determined at two locations in a large, shallow lake (Lake Okeechobee, Florida, USA). K 0 was significantly correlated with antecedent wind conditions, which explained as much as 90 percent of the daily variation in K 0 . Sub‐surface irradiance began to change within 60 to 90 minutes of the time when wind velocity exceeded or dropped below a threshold value. Maximum one hour changes in K 0 were > 50 percent, however, 20 to 30 percent changes were more common. The magnitude of change in K 0 varied spatially based on differences in sediment type. K 0 never exceeded 2.8 at a location where bottom sediments were dominated by a mixture of coarse sand and shells. In comparison, K 0 exceeded 9 during episodic wind events where the bottom sediment was comprised of fine grain mud. Underwater irradiance data can be used to determine threshold wind velocity and account for the influence sediment type has on K 0 . Once a threshold velocity has been established, the frequency, rate, and duration of expected change in underwater irradiance can be evaluated. This is critical information for scientists who are studying algal productivity or other light‐related phenomena.