Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

H (Human Geosciences ) » H-CG Complex & General

[H-CG27] Turbidity current: from triggers for the generation to the depositional and morphologic al processes

Mon. May 27, 2019 9:00 AM - 10:30 AM 301B (3F)

convener:Miwa Yokokawa(Osaka Institute of Technology), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Norihiro Izumi(Faculty of Engineering, Hokkaido University), Ken Ikehara(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Chairperson:Miwa Yokokawa(Osaka Institute of Technology), Norihiro Izumi(Hokkaido University)

9:30 AM - 9:45 AM

[HCG27-03] Conditions for development of depositional submarine channels: examination by flume experiments

*Justine Poppeschi1, Kazushi Nakata1, Hajime Naruse1 (1.Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University )

Keywords:turbidity currents, flume experiment, submarine fan

Although submarine channels are ubiquitously observed in various submarine fans, it is also known that submarine fans lacking continuous leveed channels are common depending on regions. However, the governing parameters to determine this diversity in developments of leveed channels has not been clarified yet. This is because there has been no previous researches that successfully reproduced depositional leveed channel topography in experimental flumes. Therefore, the formative conditions of depositional submarine channels have not been clarified yet. Here, we conducted flume experiments, aiming to reproduce depositional submarine channels for understanding their formative conditions. As a result, we succeeded to form experimental topography that resemble natural depositional submarine channels showing a ceiling river structure with levees in all five experiments. Comparing the experimental topography with the actual submarine fans, the relative depth of the experimental channel was slightly shallow, but features such as the spatial variation of the channel width showed similar trends to those of the actual submarine channels. Thus, we imply that purely depositional submarine channels can be formed without presence of precursor of erosive features. Furthermore, experimental conditions of this study were in the region where the previous study predicted that submarine channels cannot be formed, suggesting that further investigation is needed to discover the governing parameters for developments of submarine leveed channels.