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2017/01/03 14:00 Assistant Prof. Yueh-Jen Lai（Department of Hydraulic and Ocean Engineering, NCKU）
Seminar
Poster： ╱ Post date：2016-12-28NCU IHOS Seminar Announcement
Speaker：Assistant Prof. Yueh-Jen Lai
Place：S-325, Science Building 1
Abstract：
Title：Experiments of submarine braided channels
Speaker：Assistant Prof. Yueh-Jen Lai
Department of Hydraulic and Ocean Engineering, NCKU
Time：01/03（Tue.）14：00
Place：S-325, Science Building 1
Abstract：
Recent advances in deep-water measurement techniques and physical experiments have uncovered new insights into the planform geometry, flow patterns, evolution, and stratigraphic record of deep-water sinuous channels. These channels appear similar to their meandering river counterparts on land, but exhibit several key differences in their behavior and evolution. In contrast, few studies have compared the characteristics of submarine braided channels to subaerial braided rivers. In this study, we use six physical experiments to investigate the evolution of submarine braided channels driven by saline density currents in response to varying inflow discharge and basement slope. We find (1) the braiding intensity, defined as either the number of active channels or total channels, scales linearly with discharge and basement slope, similar to experimental subaerial channels; (2) the ratio of active transport channels to total channels is 0.5 in submarine braided systems regardless of discharge and slope, which is similar to natural and experimental braided rivers; (3) the active braiding intensity scales linearly with dimensionless stream power. Thus, it appears braided submarine channels and braided rivers are similar in some important aspects of their behavior and responses to stream power. The data contribute to a predictive framework for the channelization of submarine density currents. In light of the scale independence of braided channel planform organization, these results are likely to apply beyond experimental scales.
Last modification time：2016-12-28 AM 9:23
