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106/01/03 14:00 成功大學水利及海洋工程學系賴悅仁助理教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2016-12-28演 講 公 告
主講人：賴悅仁 助理教授
地點：中央大學科學一館S-325教室
摘要：
講題：Experiments of submarine braided channels
主講人：賴悅仁 助理教授
成功大學水利及海洋工程學系
時間：01月03日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
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.
最後修改時間：2016-12-28 AM 9:23
