The Study of Seabed Morphological Classification in the Eastern Offshore of Tungpanyu (Penghu)

• Main Authors: Yu-Han Lee, 李玉涵
• Other Authors: Gwo-Shyh Song
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/22011765670042093427

碩士 === 國立臺灣大學 === 海洋研究所 === 100 === At present, the acoustic instrument mainly used for the researchs of seabed morphology and habitat classification is side-scan sonar, to get the informations of seabed morphology and habitat by using artificial identification for the acoustic images with back-scatter energy intensity and texture patterns.This method is effective but lack objectivity. Therefore,we use SwathView which produced by QTC in Canada to process acoustic classification.The main feature of SwathView is segmentation method.We apply SwathView to analyze the side-scan sonar data of Eastern Offshore of Tungpan Yu, Penghu,with the result of topography investigation、morphology survey ,sample of habitat sediments and underwater photography to discuss the accuracy of seabed classification by using SwathView, specifically distinguish the coral rocky seabed and the no-coral rocky seabed.We also compare the SwathView analysis results and the side-scan sonar images,to evaluate the feasibility for using the side-scan sonar images to distinguish the coral rocky seabed and the no-coral rocky seabed. The results show that the study area depth ranges between 0 and 60m,and the study area can be divided into Fongguei Coastal Zone , Central Channel Zone and Tungpan Coastal Zone.And the habitat types of the study area consists of sand,rock and coral. The habitat type of Fongguei Coastal Zone is sand mainly,and the seabed is very flat. The habitat type of Central Channel Zone is rock mainly,there are many gravels and shell scraps on the seabed, part of the zone has some coral,and the seabed is rugged. The habitat type of Tungpan Coastal Zone is coral mainly,the seabed is very rugged ,and the seabed has many corals,less semidents. Comparison of the analysis results by using QTC SwathView for the side-scan sonar data ,sample of habitat sediments and underwater photography images,we get the conclusion that QTC SwathView can classify the habitat types which have different acoustic characteristics effectively if the software have enough image resolution.In addition, comparing the SwathView analysis results and the side-scan sonar images,we get the conclusion that the way of using the side-scan sonar images to distinguish the coral rocky seabed and the no-coral rocky seabed is feasible.