Abstract
We done observation in Lake Biwa, to detect bottom density currents in winter, at embouchure of Ane River which is caracterized by a heavy snow catchment's area. We use 6 mooring systems with thermistor loggers, electromagnetic current meters and dissolved oxygen sensors.
We found heterogeneitic water mass at bottom in front of the embouchure, which last 3~4 days. This water mass was higher oxygen, higher conductivity and lower temperature than surrounding water mass. This caracter is not accord with lake water and ground water, so this water mass seems originated snow melting water from Ane River.
