Wind-driven circulation in unstratified lakes

Observations of the wind-driven circulation in the vertical plane of unstratified lakes, including some new results indicating a logarithmic current profile near the lake surface, are prescntcd. A thcorctical velocity profile that is in fair agreement with a stress-driven laboratory flow, and that may approximate to the steady circulation in the central section of lakes of nearly uniform depth, is also dcvcloped. From this profile, an estimate is made of the effect on the wind setup of a gently sloping lake bottom. INTHODUCTION The purpose of this article is to review existing observations of wind-driven fully turbulent circulation in the vertical plane of unstratified lakes of constant depth and to develop a theoretical velocity pro& based on the similarity theory of turbu-lencc, This profile is shown to be in fair agreement with a laboratory stress-driven flow and may approximate to conditions in the central section of lakes of nearly uni-form depth. For such lakes, an estimate is made of the effect on the wind setup of a gently sloping lake bottom. OBSERVATIONS The surface current. The relation be-tween the surface current ( U, ) and the surface wind ( U,) has been investigated by many workers. It appears to be ade-quatcly known up to wind speeds of 15 m/set