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題 名 | 臺灣西南部嘉南平原的海岸變遷研究=A Study on Coastal Changes of Chianan Plain in Southwestern Taiwan |
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作 者 | 張瑞津; 石再添; 陳翰霖; | 書刊名 | 國立臺灣師範大學地理研究報告 |
卷 期 | 28 1998.05[民87.05] |
頁 次 | 頁83-105 |
分類號 | 351.3 |
關鍵詞 | 臺灣; 西南部; 嘉南平原; 海岸變遷; |
語 文 | 中文(Chinese) |
中文摘要 | 嘉南海岸平原形成於晚更新世,海岸線的變遷與海水進退相對應,近三百多年來 整體呈現向西推移的趨勢,古笨港、魍港(蚊港)及倒風內海已逐漸淤填,並被大量圍墾開 發為魚塭或鹽田。濱外沙洲西側海岸除河口地區外,均向內侵蝕,在海汕洲及王爺港汕西側 最大侵蝕率約達 12mn/yr。 外傘頂洲整體向東南方陸地漂移, 沙洲北段漂移速率甚至達 58mn/yr。 沙丘主要分布於新港、鹿草一線以西,其中北港地區因濁水溪供沙充足,較嘉義 沿海發達。 北港以西的海岸沙丘,大致分布在 7mn 以下,呈四列南北帶狀分布,隱示不同 時期的海岸線位置, 應形成於大湖期海侵( 3500-4000yr B.P. )之後。 比較 1904-1926 及 1990 年各時期之沙丘,其規模大致逐漸減小,係受人類開發利用影響所致。海岸平原地 區向為人口稠密地帶,地形變遷常造成洪患威脅、丘沙漂移、土地利用改變、沿岸聚落興衰 、土地權屬爭議及行政區劃定等之衝擊。相反的,人類擴張聚落、興建水庫、修築堤防、開 鑿渠道、圍墾海埔地、取直河道等作為,也造成天然地形之改變,地形變遷與人類生活息息 相關,其研究正可提供為土地規劃與開發利用的參考。 |
英文摘要 | Chianan Coastal Plain had been built since late Pleistocene. It was marked by the lagoons and offshore bars. The coast has been changed coincidently with transgression and regression. Since last three hundred years, it has prograded westward due to rapid sedimentation. Lagoons of Benkang, Wangkang and Taofeng have been filled up and reclaimed as fish ponds or salt pans. However ,the west coast of offshore bars, Haishan and Wangyeh, have been eroded with a maximum rate of 12m/yr in average. In addition, the offshore bar migrated landwardly, such as the northern section of Waishanting bar moved toward the land with a rate of 58 m/yr during 1904-1990. Responding to the abundant sand supply from Choshui River, the sand dunes distributed in Peikang coastal plain are wider than those in Chiayi. They scattered on the coast plain below 7m and could be built after Tahu transgress (3500-4000 yr B. P.). They lie in four bands approximately, which might indicate four different stages of coastline. Most of the sand dunes decreased in altitude caused by humans modification in 1990 comparing with 1904 and 1926, which become cemetery field in landuse. Overall, bi-directional relationship existed between human and landform in the coastal plain since last three hundred years. The coastal changes produced some impact on human beings including the decline of small sea ports, changes of landuse and threat of flood. In contrast, the human activities influenced the geomorphological change such as reclamation of tidal flat, construction of dike and reservoir, etc. |
本系統中英文摘要資訊取自各篇刊載內容。