Thermal and Chemical Properties of Waldo Lake, Oregon
Titel:
Thermal and Chemical Properties of Waldo Lake, Oregon
Auteur:
Salinas, John
Verschenen in:
Lake and reservoir management
Paginering:
Jaargang 16 (2000) nr. 1-2 pagina's 40-51
Jaar:
2000-06-01
Inhoud:
Thermal and chemical profiles were obtained periodically in ultraoligotrophic Waldo Lake, Oregon during years 1986 through 1999. Profiling was done on a seasonal basis between May and October. During this period the lake becomes thermally well-stratified. Epilimnetic temperatures peak in August, then rapidly diminish in response to decreasing solar radiation. By October, the lake nears autumnal turnover. During winter, the lake freezes over. The lake features an orthograde oxygen profile, and is well-oxygenated to all depths. The lake is highly dilute, as indicated by extremely low values for specific conductance (2.9-5.2 μmhos cm-1) and alkalinity (0.39-0.71 mg·L-1 as HCO3). pH readings were nearly all less than 7.0. Inorganic phosphorus and nitrogen concentrations were mostly less than the minimum detection limit of 1.0 μg·L-1. Dissolved silica concentrations ranged between 0.12 and 0.34 mg·L-1. TDS concentrations averaged 4.04 mg·L-1, with roughly 10% of all test results reported as 0.000 mg·L-1. The cause of the lake's extreme dilution is uncertain, but a major contributing factor may be the fact that the lake is fed entirely by direct precipitation and runoff, with no rivers or permanent streams entering the lake.
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