4th International Submarine Canyon Symposium (INCISE2018)
5-7 November 2018, Shenzhen, CHINA
This is the detail of DSV-based observation in Taiwan submarine canyon in South China Sea by Chinese submersible Jiaolong
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DSV-based observation in Taiwan submarine canyon in South China Sea by Chinese submersible Jiaolong
Submarine canyon systems in the northern South China Sea are a natural laboratory for studying turbidity currents and other gravity flow processes. With supports from the Qingdao National Laboratory for Marine Science and Technology, a DSV (Deep submersible vehicle)-based observation was carried out by the submersible Jiaolong in 2017, reaching a maximum water depth of 2980 meters in the Taiwan Submarine Canyon. Multibeam echo sounder and side-scan sonar on board the DSV were used to collect canyon morphologic data. In addition, high-definition photos and video footage near the canyon floor were acquired, and samples of sediment, seawater and organisms were also collected. This study shows that the morphologic changes along as well as across the canyon axis in the middle reaches of the Taiwan Canyon are very different from previous acoustic results based on shipboard multibeam observations. The microtopography of the canyon suggests historical occurrences of large turbidity currents in the middle reaches of the canyon. However, an exposed boulder on the canyon floor and live organisms attached to the surface of the boulder implies the absence of modern turbidity currents in the past hundreds of years.
Special Session: Canyons and trenches in the South China Sea and West Pacific