路廊評選之遙測地質災害調查

Remotely-sensed Geohazards for Assessing Alternative Corridors

劉進金(Jin-King Liu)

《航測及遙測學刊》 3卷4期 (1998/12) Pp. 53-61

https://doi.org/10.6574/JPRS.1998.3(4).4

摘要

台灣的三分之二以上地區為坡地，橫跨山區是建設國道系統的關鍵。因為台灣處於板塊的衝撞地帶，所以克服複雜的地質條件是國道興建在技術上最困難的問題。這些地區過去地質資料匱乏，又高山阻隔，傳統方法作大面積調查缺乏時效。因此，衛星影像與航照之判釋分析的成果圖成為國道初期規劃重要的參考來源。1989年之後遙測技術陸續應用於國內國道初期規劃的地質潛在災害調查。根據六個應用案例，在國道規劃初期最有實效的遙測成果為潛在山崩圖與主要線型構造圖。在平坦地區，三四十年前的航照可以顯示古河道、古池塘、以及都市開發前的地表狀態。至於丘陵地與山區，因為地質破碎，破碎帶之岩體的強度很低，而且易於有地下水流動，使地層極度不穩，所以潛在山崩圖與主要線型構造圖的測繪有助於路廊的評選。因此，遙測地質災害圖在資料匱乏的台灣可以提供國道建設初期規劃之路廊評選重要的參考。

關鍵字

路廊 ； 遙測 ； 地質災害 ； 地質敏感區

並列摘要

More than two thirds of Taiwan Island are covered by rugged terrain. The most difficult part of constructing a sound national highway system in Taiwan is to manage the difficulties of crossing the mountainous terrain, where geological hazard-prone areas are expected but existing geological information are still lacking. Therefore, remotely-sensed data have been employed very extensively since 1989 to give information on geo-hazards. It was also found that the usage of air-photos taken 40 years ago, can be readily identified to give indications of geological sensitive areas such as abandoned river courses and ancient ponds in the level and hilly terrain, where now are covered by recent deposits and are highly cultivated. It is, therefore, concluded that when conventional aerial photographs are employed together with satellite images, the best benefit by using remote sensing techniques can be gained. In mountainous terrain, images can be used to locate potential landslides; and, in hilly or level terrain, images can be used to identify weak and sensitive geological units. This information is valuable for assessing alternative highway corridors.

並列關鍵字

Corridor ； remote sensing ； geohazard ； geological sensitive areas