漂流木材積攔截量模式評估之探討

Study of Evaluating Model on Intercepted Volume of Driftwoods

本研究利用2004年敏督利颱風侵襲後大甲溪德基壩下游至出海口間所打撈到河床上之漂流木為樣本，建立其「長度與累計材積量」及「長度與累計平均徑」之數學模式，再以此方程式求出滯洪池攔截漂流木的長度，檢核有橋涵通過其下游的滯洪池，並分析其攔截的容量是否足夠。本研究所獲得之漂流木的長度、徑長的統計分析結果，可供公路等設計單位之參考，以期能減輕漂流木所引發之各種災害。 The study takes driftwoods intercepted in Da-jia River basin from De-ji Reservior down to outfall as samples after Typhoon Mindulle. We established numerical models to evaluate the relationships of driftwoods, such as length vs. accumulative volumes and length vs. accumulative average diameters. Finally we find out two models, one of driftwood length to fit detention pond and the other to check the capacity of detention ponds. The study also provides with the analytic results of driftwood length, diameter by statistical techniques to some departments like road-designing as references, and it is anticipated that the study is able to reduce damages from driftwoods.

The study takes driftwoods intercepted in Da-jia River basin from De-ji Reservior down to outfall as samples after Typhoon Mindulle. We established numerical models to evaluate the relationships of driftwoods, such as length vs. accumulative volumes and length vs. accumulative average diameters. Finally we find out two models, one of driftwood length to fit detention pond and the other to check the capacity of detention ponds. The study also provides with the analytic results of driftwood length, diameter by statistical techniques to some departments like road-designing as references, and it is anticipated that the study is able to reduce damages from driftwoods.