The sink of sediments suspended by waves in Lake Pyhäjärvi

TL;DRAbstract

A field survey was conducted in Lake Pyhajarvi, South-West Finland. Measured wave lengths were not long enough to cause active suspension of sediment at the bottom but surface seiches as ultra-long waves due to the same wind certainly could touch the bottom only around the nodal lines. However it was confirmed after reading the water level records. There were probably simultaneous currents induced by the wind which generated waves and excited seiches. These combined processes would disturb the bottom and produce turbidity. Suspended sediment should have arrived from sources taking time to travel over half width of 4 km. The CTD profiles around the deepest point of the lake were taken and compared with the nearest cast in the talweg. A thermally unstable intermediate layer was consistently found from an array of temperature loggers in the valley, and the anomaly was just below the average depth of 5 m in temperature profiles. Thermal inversion in the intrusive layer was about 0.1C at 15

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