碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 101 / This paper aims to study the use of experimental base of offshore wind turbine casing underwater influenced by waves and stream suffered erosion around the base case . And with the use of offshore aquaculture structures , Cage structure, on the surface facing the stream and wave , compare the difference of the surrounding base of the topography be scoured for cage.
Test at National Cheng Kung University Hydraulics Laboratory plane tanks. First , the test carried out hydrodynamic tests discussing the different positions and length of cage netting, effecting of stream mitigation and reduction of wave height , find the optimum conditions for cage. Then fixed rule wave height and different wave periods, the experiments of wave attenuation were conducted. According to the above experimental results, two cases were taken the best cage condition to test for terrain erosion, and the situation of the topography scouring were investigated.
According to wave attenuation and slow down on test results, after placed cages in facing wave side, the wave attenuation was little affect. When the cage is placed in facing stream surface, stream rate has been significantly decreased. under low stream rate , cage placement closer , netting the longer the length , the better the effect of slowing down the stream rate. Experimental results in terms movable bed for pure stream, it is found that in the absence of cages the erosion affect large regions are mainly located in the surface facing the stream. The greater the rate the greater the depth of maximum scour will be, the greater the impact of scour range and due to the base effect the flow field the larger the range of deposition will be. After using cages , each of the stream rate has improved maximum scour depth and greater depth range is reduced erosion and other effects. Due to the base and the cage effect the flow field and the formation of sediment range is larger than those without cages , especially under the high rate, the deposition ranges formed by the base and the cage effect is larger. In wave-current interaction system, the scour affect large regions are mainly located facing the wave side and the facing stream side. After using cages in facing the stream, has decreased maximum scour depth and range of larger scour depth on the base of the pile facing the stream ,and in the back wave side there are siltation because the stream field affected by cage resulting. When using cage facing the wave side and the stream side, the cage of facing the wave side the maximum scour depth and greater depth of scour range has also improved.
| Identifer | oai:union.ndltd.org:TW/101NCKU5083019 |
| Date | January 2013 |
| Creators | Jian-WeiLi, 李建緯 |
| Contributors | Huei-Huang Hwung, 黃煌煇 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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