臺灣西北海岸後退之研究淡水河口至頭前溪口段

A Study of Coastal Retreat, from Tanshuiho to Touchianhsi Section Northwestern Coast, Taiwan

許民陽(Ming-Yang Hsu) ； 張智原(Chih-Yuan Chang)

《中國地理學會會刊》 38期 (2007/03) Pp. 1-22

https://doi.org/10.29972/BGSC.200703.0001

摘要

海岸後退為臺灣西北海岸最明顯的地形變遷，本研究進行不同年代的航照和地圖比對，現地觀察、測量和訪談，並採集標本定年等工作，發現淡水河口至頭前溪口海岸至少有四處嚴重後退的地段，臺北縣八里鄉所在的淡水河口以南海岸，20年來的累計後退量可達306公尺左右，大園鄉潮音至草漯一帶也有100公尺左右，其他各段也有50公尺不等的後退量。
颱風帶來的暴浪侵蝕沙丘崖腳，以及東北季風和颱風帶來的強風使沙丘沉積物由迎風側搬至背風側，使沙丘內移，加上河床採砂導致陸源沉積物供應的減少，使沿海沉積物收支不平衡皆為海岸後退的主因。

關鍵字

西北海岸 ； 海岸後退 ； 沙丘侵蝕

並列摘要

Coastal retreat is the most obvious destructive processes along the northwestern coast of Taiwan. Between the river mouth of the Tanshui River and the Touchian River, at least 4 coastal sections which have experienced severe retreat were identified by comparing two sets of aerial photos taken twenty years apart and by field investigation. The most typical retreat area located at the northern end of study area has retreat at least 306 m over past twenty years.
Typhoon induced storm wave attack the foot of sand dunes, and strong wind of northwestern and typhoon transport the deposits of sand dunes from windward to leeward, make the sand dune shifting landward. Otherwise, collection of channel sediment in the river caused the decrease of land-origin sediment along the coast, results the unbalance sediment budget along the coast are the main factors that make the coast recession.

並列關鍵字

Northwestern Coast ； coastal retreat ； erosion of sand dune

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