碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 94 / With the increasing of population and the improvement of industrial and/or commercial activities, coastal zone’s usage has been put on more emphasis in Taiwan. Due to the limit territory and ocean surrounding environment, it is necessary to ensure the efficient usage of space and avoid the negative affections caused by human over-developed in coastal zone. So, nearshore current survey and marine data collections such as wind, wave, and depth were indispensable on the characters studing of coastal zone.
The relative low price free drift float which is based on GPS positioning and Radio transmission technique carried out the measuring operation instead of using the precious bottom assembled ADCP/current meter to describe the marine flow field characters. Operation risk so, could be reduced by using several free drift floats and few of precious equipment to pick up the current data in marine environment. Theoretically, similar measuring results (false in reality) should be obtained with Eulerian type measuring (ADCP/current meter) and Lagrangian type (free drift float) procedure under the stationary assumption. These studies focus on the wind effect research of interfering the drift tracking and to evaluate the positioning accuracy of this custom-built free drift float.
The coastal zone in between southern(Ching Shuei) and northern(Gong Guan) coast of Lan Yang River in YiLan has been selected as the test environment. According to the test results, the free drift float can response the nearshore current field character in 3m/s less of wind velocity and begin gradually the interfering in 1.5m/s up of wind velocity. The average longshore current velocity estimated by both Sato and Eagleson(1965) formula provided a verification datum of current measuring by the free drift float and being identical in speed and, the deviation of 28% in speed has been found which could be affected by wind. Through the measuring data corrected by environmental interfere factors, the free drift float can be applied in field measuring operation and offer the accurate current data as references on coastal engineering planning, designing, evaluating and managing.
| Identifer | oai:union.ndltd.org:TW/094NCKU5083051 |
| Date | January 2006 |
| Creators | Ming-Chien Lu, 呂明杰 |
| Contributors | Pei-Hua Yen, 顏沛華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 91 |
Page generated in 0.0137 seconds