Abstract
In winter seasons, snow clouds are often caused on the tip of a cold air flow by an ascending wind around Ishikari Bay. The extended distance of the cold air flow over Ishikari Bay is determined by the interfacial friction between the cold air flow and the upper wind. In order to estimate the coefficient of the interfacial friction, density current experiments of the cold air flow were carried out using the difference of the temperature, and its coefficient was derived on Re≤2×105 and Re>2×105, respectively. Using this coeffient and proposing the cold air flow model, we can reproduce the extended cold air flow on Feb. 18, 1996 which snow clouds occured on the tip of the cold air flow.
