成層密度流の流速分布則に関する研究

Abstract

It is one of the main problems to predict the velocity distribution in order to analize the trans-port phenomina in a density stratified reservoir. The velocity profiles are discussed based on themixing length theory.In a case of the upper layer flow, we often call it a surface layer flow as the same mean, thetheory of the velocity profile is developed, assuming the mixing length, l=lo+kywhere lo is the mixing length at interface of thermocline.The nondimensional mixing length defined as β=lo/d, where d is the thickness of the mainflow, is determined as a function of velocity coefficient, U/u*.Following the upper layer flow, the equation concerning the velocity profile of a middle layerflow is presented. The theory comprizes the method to predict the maximum velocity and thedepth where the maximum velocity occurs. The depth is evaluated from the density differencesbetween the main flow region and the other ones.These theories discussed in this paper show a good agreement with the experimental results.