Due to the terrace scarps are usually well vegetated or covered by colluvial and the terrace sediments are highly permeable, to investigate the properties of fluvial terraces is very difficult in Taiwan, especially the dates of their sediments.

• 摘要台湾的河阶地因爲植被覆盖，经常缺乏良好的露头，且沉积物富含砾石，透水性佳，以致于年代资料获得非常困难。