旗津的沙灘不見了 - 高雄
By Hamiltion
at 2009-01-09T01:14
at 2009-01-09T01:14
Table of Contents
突堤效應:
簡單說,就是攔住「漂沙」。隨著堤的走向有兩種態樣:
1. 堤與海流垂直:
原始海岸 → 建了堤岸 → 產生突堤效應
| 堆積|侵蝕
→海流方向→ →海流方向→
2.堤與海流平行:
堆積
——
→海流方向→
※ 引述《liangcheng (人半醉)》之銘言:
: 應該是因為北方防波堤的興建
這個理由,看似正確;我不敢說它沒有,但是影響應該非常非常小。
理由一、
民國87年耗資8億多元、費時8年才興建完成的海岸公園、高雄市政府工務局
下水道工程處為搶救觀海平台及遊客中心,在92年中耗費二千多萬元鋪上大批
鵝卵石與消波塊固基護灘。會笨到在北邊蓋垂直洋流的堤岸理由要非常堅強。
理由二、
從形成背景來看,旗津本來就是突堤效應下的產物。先複習一遍:
簡單說,就是攔住「漂沙」。
高
屏
溪(提供漂沙)
旗后山
↑ ←夏季海流方向
形同堤岸
1.攔住:
http://tinyurl.com/8etmng 這個計畫,就是那個去作蠢事的堅強理由。
旗后山
旗津
侵蝕轉強 填海造陸 堆積轉強
←海流方向
2.漂沙:
高屏溪上游開發不如從前,加上興起攔沙壩,提供漂沙量不可同日而語。
還有一個我不甚確定的說法。日人造港,大量運用炸藥,導致旗津海域
海底環境大變,影響海底海流。
總結:
旗津(海灘)因突堤效應而生,現在因人類介入而消失。突堤的堤,在南
邊而非北邊。鄉親啊!記得好好檢視那個去作蠢事的堅強理由,最後有沒有
符合政府所說的願景。那可是用旗津海灘作賭注的。
: 所帶來的突堤效應 使旗津的漂砂減少
: 導致海岸線縮減...吧
: 印象中是這樣
PTT就是一個不斷證明印象不可靠的所在。
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