Sea Technology

SEP 2017

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www.sea-technology.com September 2017 / st 37 demonstrating that the sampling device was simple to oper- ate during the testing. The device was first attached to the steel cable of a crane on a boat, and then lowered slowly until it reached the seafloor. The cable was then shaken to judge whether the device had reached the seabed, and the sample collection process was performed by moving the boat forward by 5 to 10 m. Tens of sampling experiments were performed in this area. The results show that the differences between sand samples collected from different water depths are easily dis- tinguishable. These samples also fulfilled the requirements for usage in follow-up experimental studies of hydrodynam- ics and geological research in the Taiwanese shoal where the device was tested, as the samples were highly distin- guishable and in a complete state. A comparison of the seabed sample data of two highly disparate sampling sites indicates that the water depth dif- ferences between these two sites ranged up to 40 m, ap- proximately. The sample collected from the 23-m depth site is composed of fine sand, while the sample collected from the 65-m depth site is composed of fine sand mixed with some mud and is darker in color by comparison. The results of testing show that the seabed surface sam- pling device is able to perform in a variety of water environ- ments and seabed conditions to obtain complete samples in sufficient quantities. Conclusion The seabed surface sand sampling device presented here has gone through tens of experiments in a Taiwanese shoal, with samples obtained from depths ranging from 20 to 65 m. Each of these samples were of sufficient quantity and desired quality, and the sampling device was unaffected by the different flow velocities in the sampling areas. The sam- pling device is relatively light and small in size and is eas- ily launched from small boats or other floating equipment. The op- erational reliability of this device for the collection of seabed surface sand samples has been established with testing operations in the Taiwanese shoal, which dem- onstrated that the device creates only small levels of dis- turbance on the seabed. This device provides smooth and stable operation in a wide variety of water depths. Acknowledgments We would like to thank the reviewers for their sugges- tions on this article. We would also like to thank the Na- tional Natural Science Foundation of China (Grant Nos. 41374043, 41574015 and 41476049) and the Chinese Po- lar Environment Comprehensive Investigation and Assess- ment Programmes CHINARE (2017-01-03 and 2017-03-03) for financial support, as well as the Public Projects of Zheji- ang Province (2016C31120). ST Dr. Xiaowen Luo, from Jinsha, Guizhou, China, is a research associate at the Second Institute of Ocean- ography of the State Oceanic Administration, where he focuses on research related to marine surveying and mapping and integrated navigation. Dr. Ziyin Wu, from Xinyang, Henan, China, is a pro- fessor and works at the Second Institute of Oceanog- raphy of the State Oceanic Administration, where he focuses on research related to marine surveying and mapping and terrain and landform. Lingkun Deng, from Nanchang, Jiangxi, China, is a master's student at Nanchang University who focus- es on positioning and integrated navigation. (Clockwise) The seabed surface sam- pling device. A comparison of the seabed sample data from two sam- pling sites with different depths. A comparison of samples that were collected from two sites of different depths.

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