日本地球惑星科学連合2016年大会

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インターナショナルセッション(口頭発表)

セッション記号 H (地球人間圏科学) » H-GM 地形学

[H-GM01] Geomorphology

2016年5月23日(月) 13:45 〜 15:15 301B (3F)

コンビーナ:*島津 弘(立正大学地球環境科学部地理学科)、瀬戸 真之(福島大学うつくしま福島未来支援センター)、座長:瀬戸 真之(福島大学うつくしま福島未来支援センター)、島津 弘(立正大学地球環境科学部地理学科)

14:45 〜 15:00

[HGM01-05] Velocity and Sediment Concentratin Distributions of Turbidity Currents

*Sytharith Pen1Norihiro Izumi1 (1.Hokkaido University)

キーワード:turbidity current

Abstract. In this work, we present a mathematical model to describe the
distribution of the velocity and the particle concentration of the turbidity
currents. The turbidity current is described by the Navier-Stokes equations
with the use of Boussinesq approximation to approximate the e ect of sed-
iment concentration on the
ow, the di usion/dispersion equation for the
sediment transport, and k- turbulence model for the problem closure. The
model is simpli ed by a roof-like con guration which allows a steady equilib-
rium state of the
ow. The numerical solution of the distribution of the
ow
velocity, the sediment concentration, the turbulence energy, and the dissipa-
tion rate are obtained by the nite-di erent numerical scheme. The study
shows that the entrainment capacity of sediment due to turbulence and the
dampening characteristic of turbulence is aliated with Richarson number
and non-dimensional settling velocity. The model is capable of capturing the
fundamental characteristics of the turbidity current which provides a vital
base state for the analysis of morphodynamics generated by the turbidity
current.