碩士 / 國立臺灣大學 / 地理環境資源學研究所 / 90 / Estuary is located on the interface of river and sea, the morphology of estuary is influenced by the factors coming from both environments and human activities. The study intends to analyze morphological change of bank along Tamsui Estuary.
The study method is conclusion and analysis. By using topographical maps, aerial photo interpretation and estuarine cross-section data, the change of estuary is mapped, and collecting environments data to discuss the relation to morphological change trend. Results show that:
(1) The zone from Chuwei to Watzewei is the most abundant deposition zone in estuary , bank form change is related to channel width and lateral erosion.
(2) In plane, the shoreline change trend was retreat-advance-retreat in 1904-1980.In recrent decades, the shorelines change trend on Watzewei was retreat to advance,and these on Chuwei were etreat to stable.In profile, these were erosion to slight deposition.
(3)”Sediment budget lack” on estuary was primarily due to miming . After1986, the human reduced to influence on the supply of upstream sediment and the groins of Taipeiport,nearby estuary mouth, captures some terrigenous sediments.The combination of these factors made estuary deposition. Flooding was not outstanding factor to long-term morphological change .
(4)The estuarine bank retreat threatened human inhabit security and made land-use landward, the erosion threat reduced after 1986.In the meanwhile, the slight deposition of banks are use for mangroves distribution.
| Identifer | oai:union.ndltd.org:TW/090NTU00136004 |
| Date | January 2002 |
| Creators | Chang,Wan-wen, 張菀文 |
| Contributors | Lin,Jiun-Chuan, 林俊全 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 85 |
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