碩士 / 國立臺灣師範大學 / 地理研究所 / 92 / Abstract
Estuary is an important channel to connect the land and oceans , including three aspects: river、mainland and coast；under the influence of mainland and ocean physical strength ,estuary apparently is an motive turning point of flowing water and silt, presenting its complexity and sensitivity.
Shuang-xi Estuary is a famous bathing beach in North Taiwan. Recently,with the noticeable changes in the shape of spit, Zhong- jian dock established in 1999 becomes a target of the public criticism.There are many reasons to cause changes in coast topography and must make much research to make out.According to the findings of the one-year field work and in comparison with the aerial photographs,we attempt to find the key points that change Shuang-xi Estuary’s landform.
Based on the result of the research,we conclude four factors that changed Shuang-xi Estuary’s landform. 1.Typhoon’s intensity、path、season and interval time between two typhoons 2. cloudburst 3.wave arising from northeast monsoon 4. Fu-Long fishery harbor. Strong run-off and wave that arise from typhoon will bring about some variation in the sites of erosion and aggradation on right and left banks at Shuang-xi Estuary,occasionally even making old outlet deposition and then forming new outlet. According to the one-year field work and in comparison with the aerial photographs,if there are no successive typhoons attacking, geomorphological cycle of this estuary is supposed to be 3-4 years or so.Besides ,strong run-off arising from cloudburst always destroy the spit on the left bank ,and it needs 3-5 months to recover its former landform. Based on the research,when the wave height is over 2 m,it will cause some changes in the beach’s landform such as reducing volume of the sandbar,beach retreat and become steep；besides , the wave height and the volume of the sandbar are in an inverse proportion.As to the other engineering along the bank, in 1993 ,Fu-Long fishery harbor was built on the right bankof Shuang-xi Estuary, after that,aggradation of its area has become larger and larger on the west side of the harbor year after year.It demonstrates that Fu-Long fishery harbor had much influence on Shuang-xi Estuary’s landform.
At Shuang-xi Estuary ,the landform change is related to natural and man-made projects .In this study,we analyze alterant characteristics of Shuang-xi Estuary in one year、the effects and recovery by typhoon events and to differentiate each effect from various river and coast engineering. The results we get could provide insights to schemes and developments at estuaries by the operation of bathing beach and the public river and coast engineering.
| Identifer | oai:union.ndltd.org:TW/092NTNU0136013 |
| Date | January 2004 |
| Creators | Jun-zhang Huang, 黃俊彰 |
| Contributors | Hsueh-mei Lin, 林雪美 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 0 |
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