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地層下陷

地層下陷.

edan-odonnell
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地層下陷

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  1. 地層下陷 一般的地層下陷可以說是自然現象，從河流所沖積下來的沙石所構成的沖積平原，當沙石的顆粒愈小，壓實的程度就愈明顯，這是屬於自然的地層下陷。當外力的作用，例如車子震動，施工震動，建築物的重量等，都會壓密地層，這是第二種無法避免的地層下陷。至於過度抽取可撐住土壤層的地下水所造成地層下陷，就屬於人為的破壞了。根據經濟部調查，目前台灣沿海地層下陷面積達1700平方公里，相當於6個台北市，主要分布在西南沿海及宜蘭沿海，地層下陷最嚴重的屏東佳冬鄉塭豊村，25年來累積下陷達2.26公尺。而地層下陷所帶來的災害包括建築物與管線的變形拉裂、排水溝渠功能喪失、淹水、土壤鹽化、沙漠化、含水層機能喪失與海水入侵等等，影響範圍與程度相當廣大，不可不慎。

  2. 地層下陷 資料來源： 經濟部水利署—地陷資料庫 http://www.subsidence.org.tw/ 地層下陷防治資訊網 http://www.water.tku.edu.tw/sub91/

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