Abstract
River outflow and depositional processes of the river Solo (East Java, Indonesia) have been studied. Mud deposition and delta growth are essentially the result of river outflow in the wet season. Outflow mainly has the character of a buoyant jet with a lateral spreading and vertical thinning of the fresh water plume. The large supply of sediment in combination with decreasing flow velocities, due to entrainment and vertical mixing, causes a rapid settling and deposition. Maximum fresh water discharge is at high water and riverborne sediment is trapped by a monsoon-induced inflow beneath the plume in combination with tidal currents. The lack of strong tidal currents and the presence of old river plumes with a significant residence time within the coastal zone further enhance sedimentation.
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