琵琶湖における水温・濁度の変動機構

Abstract

Variations of water temperature and turbidity were measured in Lake Biwa during the field experiment in the summer of 1993. Thermal destratification as a boundary mixing, effects of heat exchange with the air and sediment under the enhanced discharge condition in the shallow South Basin were discussed.While in the deeper NorthBasin, vertical transport processes of double diffusive scalars, including convection, settling and internal seiching were investigated by comparing the temperature profiles in and outside the enclosure.Strong tendencies for resuspension of fine sediment were observed in an embayment affected by the typhoon, in a benthic boundary layer where the internal wave breaking was taking place and in an intrusive turbid layer above the seasonal thermocline.A mechanism through which sediment fluxes are controlled by the thermal stratification has been suggested.