碩士 / 國立成功大學 / 水利及海洋工程學系 / 104 / Submarine canyon is the main channel to transport material from continental shelf to abyss plan. Interaction between turbidity currents and submarine landscape is important for canyon evolution. But the origin of submarine canyon is not well understood. In this study, we start with an experiment about how the turbidity currents eroded submarine canyon. We substituted turbidity currents with saline flow and gradually increased the relief to evolve both drainage area and channels. The experiment processes are recorded by time-lapse photography. Topographic imaging system is used to construct the DEM for each experiment stage. We use orthophoto for plan-view observation and calculating the area of drainage system. We slice DEMs for longitudinal profiles. The results of normalized longitudinal profiles for each stage shown highly self-similar to each other. We defined the excavated canyon volume and thus derived the simplified geometric equation to estimate canyon volume in the pass and future. We also construct a flow accumulation model through the DEMs to acquire the discharge profile of turbidity currents. Look forward to that our experiment results are not only promoting the studies of canyon evolution, but also inspiring other people to investigate the origin of submarine canyon.
| Identifer | oai:union.ndltd.org:TW/104NCKU5083010 |
| Date | January 2016 |
| Creators | Jyun-FongJiang, 江駿豐 |
| Contributors | Yueh-Jen Lai, 賴悅仁 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 147 |
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