本研究主要探討旗山溪中臺灣石(Acrossocheilus paradoxus)於一年之中的十六個流量情境下，在研究範圍內8個涵管站點的通過率，以及涵管便道對河川縱向連接性的影響。本研究透過現地量測與魚類游泳能力的文獻，訂定出魚類移動時遇到涵管可能會遇到的三種障礙：流速障礙、水深障礙、高差障礙。再以HEC-RAS模擬溪水流經多重涵管時的情況，以及使用FishXing軟體評估十六個流量情境之下各個涵管的魚類通過率與整體涵管通過率，最後利用樹狀連通性指數(DCI)與潛在棲地可獲得長度(PHG)於十六個流量情境下綜合評估涵管移除順序的優先次序。快速評估的結果為6個站點共105個有水的涵管中，有42個涵管流速過快，比例達40%，而水深與高差障礙的比例皆為12.4%。模擬結果顯示各個涵管站點的流量─通過率關係複雜，但普遍而言隨著流量的增大而減小。高流量時(六月至九月)的通過率幾乎為0，DCI值為61.13%；於同樣為臺灣石生殖季高峰的十月各涵管站點的通過率最大也不到15%且有1個站點通過率為0，DCI值也僅有61.44%。顯示涵管結構物本身對於溪流生態棲地有著破碎化(fragmentation)的影響，河川縱向連接性也將因溪流中的涵管結構物存在而較自然河段大幅降低，不利於魚類在溪流中的移動。綜合DCI值與PHG值於十六個流量情境的計算，也基於河川縱向連接性與其生態效應的評估結果，移除站點的優先順序建議為這四個站點：站點1、站點2、站點7、站點8。依據本研究的結果，可對於涵管便道對於魚類通過率以及河川縱向連接性之影響有進一步的了解，其建議也能提供河溪復育的參考方向。

Anthropogenic barriers such as culvert roads impact fish passages and hydrological longitudinal connectivity in the stream. This study discussed the culvert station’s passability of Acrossocheilus paradoxus under 16 flow scenarios and the impact of culvert roads on hydrological longitudinal connectivity in Cishan River. The three types of barriers were defined as velocity barrier, depth barrier, and drop barrier by undergoing the literature review and the site survey. HEC-RAS and FishXing were selected for flow allocation of multiple culverts and culvert station passability of Acrossocheilus paradoxus under different flow scenarios. To evaluate connectivity and prioritize culvert stations removal, dendritic connectivity index(DCI) and potential habitat gain(PHG) were used. The result of rapid assessment in 105 culverts of 6 stations indicated the proportion of velocity, depth and drop barrier were 40%, 12.4%, 12.4%, respectively. The simulations showed a correlation between flow and passability are complicated in each culvert station. Generally, passability decreases as discharge increases. In high flow conditions(June to September scenarios), passability of each stations are almost zero with a DCI value of 61.13%. In the October scenarios, the peak breeding season of Acrossocheilus paradoxus, passability of each stations were less than 15%, and DCI value was 61.44%. The result indicated that the culvert stations itself yields stream habitat fragmentation and reduces hydrological longitudinal connectivity. According to the calculated results of DCI and PHG under 16 flow scenarios, it is suggested that the priority of culvert stations removal is station 1, station 2, station 7 and station 8.

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