photo2nd
DESCRIPTION
photo of erosion preventingTRANSCRIPT
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減能柔性保護工施工前、後的比對分析:
一、安裝完成之減能柔性保護工
照片顯示為安裝後之柔性海岸保護工,已經在台南縣北門鄉雙春海岸
獲得成功的成果。其作用介紹如下:
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1.鋼索石籠:提供裝置的穩定。
2.柔性葉片環圈:保護裝置、改變水流方向、減能。
3.柔性葉片網:減緩海浪的能量,形成「減能流」,使海水中挾帶的
砂因能量消減而落下,故「減能流」流經範圍的海岸,均能因落砂緣
故而使海岸逐漸增高,除防止海岸侵蝕外,尚可達到恢復海岸之目的。
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二、施工前、後的比對分析
現勘(距南側 350M)自 A 向南攝影
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2010/1/18 同一地點自 A向南攝影,該處被侵蝕部位已淤積恢復原狀.
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2009/1/5 現勘(距南側 350M)自 A向北攝影
2010/1/18 同一地點自 A向北攝影,該處被侵蝕部位已淤積恢復原狀.
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2009/6/22 蓮花颱風後海灘侵蝕樹根裸露
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2010/2/2 掩埋至樹腰外,整個樹林帶內形成許多平行沙丘,沙丘方向自西南往東北
方向,,與西北浪方向成垂直.
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2009/6/24 蓮花颱風後,於保護工正後面,自 B往北攝影裸露四排竹子
2009/08/15 莫拉克颱風後,同一地點自 B往北攝影,稍微淤積.
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2010/2/2 同一地點,自 B往北攝影,原先侵蝕裸露之竹子原四排僅剩半排.
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2009/6/24 蓮花颱風後,自 B向南攝影,裸露四排竹子
2010/2/2 自 B 往南攝影,原先侵蝕裸露之竹子原四排僅剩一排.
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2009/8/15 莫拉克颱風後,自 C往北攝影竹子裸露情形.
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2010/2/5 自 C 往北攝影,堆積成弧形.
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2009/8/15 莫拉克颱風後,自 C往南攝影竹子裸露情形
2010/2/5 自 C 向南攝影,堆積成弧形.
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2008/8/30 於曾文溪曾文二號橋下 P5 橋墩前施做橋墩保護工
2008/8/30 於曾文溪曾文二號橋下 P5 橋墩後施做橋墩保護工
2008/8/30 於 P5 橋墩保護工完成時之側照
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2008/9/16 於辛樂克颱風洪水之退水段
2009/8/13 於莫拉克颱風洪水之退水段已接受 8300CMS 之考驗
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2009/8/26 於莫拉克颱風後洪水退後該橋墩保護工完整
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2001/5/30 於雲林縣古坑鄉華山村完成格柵欄安裝(第一代防治土石流裝置)
2001/8/3 桃芝颱風攔截到之土石流
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2007/4/30 於南投縣水里鄉三廍坑安裝柔性攔阻網(第二代防治土石流裝置)
2007/4/30 完工時之情況(由上游往下游攝影)
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2007/8/14 帕布、梧提颱風後土石流發生後之情況(由上游往下游攝影)
2m
40 cm
2m
40 cm
2007/8/14 帕布、梧提颱風後攔截土石流堆積情況
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2007/8/14 人由側網翻越情況