Author(s): S. Nomura; H. Sakaguchi; G. D. Cesare; S. Venuleo; J. Hitomi; Y. Murai; Y. Tasaka; Y. Takeda

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Keywords: Turbidity current; Saline density current; Velocity profile; Lock-gate flume; Ultrasound Doppler velocity profiler

Abstract: The flow field of turbidity current and saline density current in lock-gate flume is measured by the ultrasound Doppler velocity profiler. The horizontal and vertical velocity and their fluctuations are discussed. Turbidity currents (TC) travelling over the seafloor have huge impact on submarine topography. Their flow structure has several similarities with saline density current (SC), however some differences are observed mainly due to the fact that in TC particle interaction occurs while it does not in SC. To observe these differences the horizontal and vertical velocity structure of TC and SC are measured by ultrasound Doppler velocity profilers (UVPs) in a lock-gate type flume. Three initial densities are chosen. It is found that TC and SC have similar flow structure despite of density differences, while they present somewhat different flow systems induced by the presence or absence of particle-fluid interaction.

DOI: https://doi.org/10.3850/978-981-11-2731-1_105-cd

Year: 2018