密度流先端部の解析における相似理論の適用性

Abstract

When the behavior of a density current head is analyzed theoretically, the similarity theoryconcerning to the velocity, density and shape of the head is often introduced. At first, previousstudies having used this theory were taken up, then the points at issue and applicability of thesestudies were examined.We presented conservation equations of volume, mass and momentum. By using similarityparameters related to the velocity, density and geometric shape, analytical solutions were given andcompared them with previous studies for the maximum thickness, density increment and advancingvelocity of the head of a density current without suspended sediments.Moreover, we guessed the values of these parameters theoretically and experimentally, andby using these parameters, applicability of our theory was investigated by experiments concerningto density currents and turbidity current surges.In results, for not only density currents without suspended sediments but also turbidity currentsurges with suspended sediments, our theory proposed here agreed fairly well with experimentalresults by considering the net deposition of the suspended sediments if the currents are composedof them.