由於受到天體引力的影響,使得感潮河段的水文水理現象尤其複雜,加上上游河川水流下瀉,使之形成週期性的漲退關係,而難以用時間序列方式推求感潮河段流量之大小,亦不同於非感潮河段的單一水位對應單一流量的關係。面對氣候變遷與極端水文事件逐漸上升的狀態下,感潮河段水位-流量之關係勢必為未來災害探討的重要因素。 不同以往使用既有水理模式之方法,本研究將具有訊號特性之感潮河段水位數據利用時頻分析方法Hilbert-Hung Transform(HHT),做為感潮河段水位分析之工具,選取台北與三重之重要溝通橋梁—台北橋作為主要分析地點,將水位訊號所分解之本質分量函數(Intrinsic Mode Functions,IMF)做進一步的分析,並蒐集年度實測流量,共同探討HHT於製作感潮河段率定曲線之可行性,一旦關係建立,於未來即可發展具即時性之流量推估方法,更可有效減少施測次數而得到準確之流量,達到事半功倍的效果。
Because of astronomical phenomena, it’s complicated to explain the hydraulic variability on the tidal reaches. The periodical relation which up and down is difficult to estimate the discharge timely, however it’s different with the nontidal reaches that exist the relation one-by-one. The extreme hydraulic events will occur frequently in the change of climate. Therefore, it’s important component to discuss the relationship on tidal reaches. Unlike other model method, this study used Hilbert-Hung Transform method (HHT) to analysis the stage of tidal reach. Accorading to the tidal stage and observed discharge in Taipei Bridge, we can obtain IMF to establish the relationship between the stage and discharge. After defind the relationship, we can perform other similar study. It certainly be helpful to estimate the timely discharge in the future.