台灣防砂壩魚道防堵及束水之研究

Anti-blockade and Increase in Water Depth for Check Dam Fishway in Taiwan

段錦浩(Ching-Hao Tuan) ； 楊家豪(Chia-Hao Yang) ； 蘇國振(Kuo-Zhen Su)

《中華水土保持學報》 33卷4期 (2002/12) Pp. 261-269

https://doi.org/10.29417/JCSWC.200212_33(4).0002

摘要

魚道出口設置水平篩分鋼棒之設計，在引導水流進入魚道及大礫石分離上有很大的效果。而魚道內設置砂丘板也確實能達到增加水深及減緩流速之目的，無論砂丘板有無開口，當砂丘板間距越小時，其水深變深，但有開口砂丘板在提高水位方面卻沒有預期的理想。不過，有開口式砂丘板在穩定流心及排除淤砂方面較無開口式砂丘板來的理想，所以在魚道內設置砂丘板應以有開口式之砂丘板較佳。本研究採用數種不同渠槽流量，針對鋼板柵通透率、魚道坡度、砂丘板間距及有開口砂丘板之開口寬度與高度作進一步的探討，針對架設砂丘板後各斷面渠槽的水位高、流速及比能加以討論，並進行加砂試驗。

關鍵字

魚道 ； 開口式砂丘板 ； 篩分鋼棒

並列摘要

The horizontal steel bar screening device on the water inlet of the check dam fishway has a good effect on guiding the water into the fishway and on screening the larger gravel. The installation of artificial sand dunes with or without opening makes it feasible to increase the flow depth and to reduce the flow velocity in the fishway. The water depth increases when the interval of the artificial sand dunes decreases. But the artificial sand dunes with opening have no special effect on the water depth. Anyway the artificial sand dunes with opening have better function in stabilizing the flow and eliminating the deposit. Therefore, it's better to set up artificial sand dunes with opening in fishway. In this research, several discharges for the rates of sediment input, slopes of fishway, sand interval dunes, and the width and the height of sand dune opening were studied to investigate the relationships among depth, flow velocity, and specific energy.

並列關鍵字

fishway ； artificial sand dunes with opening ； steel bar screening