密度躍層のある場における濁水の挙動に関する研究(1) ―躍層における拡散係数を中心として―

Abstract

One of the main purposes of our present investigation is to bring light on the streampollution due to very fine particles in reservoirs and downstreams of dams.For the first step to solve this problem, we mainly deal with the prediction of turbulentdiffusion coefficient in a density stratified layer. Based on the one-dimensional continuityequation and density defect law in the two-layered model and on the two dimensional diffusionequation in the continuous model, the predictive equation of diffusion coefficient in athermocline was theoretically derived.We also describe the degradation of the thermocline due to turbulent entrainment undertheoretical and experimental considerations. Moreover, the analytical approach for turbidityflows in stratified reservoirs was discussed based on the diffusion equation with the repre-sentative three layered model.