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Downstream passage behavior of potamodromous fishes at the fish protection and guidance system “Flexible Fish Fence”
Ecological Engineering ( IF 3.9 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.ecoleng.2019.105698
Heidi Kammerlander , Lisa Schlosser , Bernhard Zeiringer , Günther Unfer , Achim Zeileis , Markus Aufleger

Abstract Using an outdoor experimental channel, this study evaluates downstream passage behavior of potamodromous fish species at an innovative fish protection and guidance system, the Flexible Fish Fence (FFF). Under variation of the spacing between the cables, the exposition angle and the approach velocity, the fish protection and the guidance efficiency are investigated. Experiments were carried out using wild born and PIT-tagged chubs (Squalius chephalus), graylings (Thymallus thymallus), brown trouts (Salmo trutta) and rainbow trouts (Oncorhynchus mykiss) with body lengths between 100 and 200 mm. The results show that fish protection efficiency is predominately dependent on the cable spacing and varies strongly between fish species. While all fish (100%) are prevented from passing through the FFF at 10 mm spacing, it is far less effective at 20 mm spacing (83% of chubs, 59% of trouts and 26% of graylings). The effects of the exposition angle, the approach velocity, and the fish length are identified using multinomial logistic regression models: fish protection efficiency increases significantly with increasing fish length and increasing approach velocity (particularly for the highest angle) for chubs and trouts. Increasing flow velocity induces cable vibrations presumably triggering avoidance behavior. Unfavourable hydraulic conditions at the bypass entrance (approach velocity of 0.65 m s-1, velocity changes or turbulences) negatively affect the bypass efficiency for all fish species, pointing out that the design of bypasses for downstream migration is of major relevance.

中文翻译:

鱼类保护导引系统“柔性鱼栅栏”下河鱼的下游通过行为

摘要 本研究使用室外实验通道,在创新的鱼类保护和引导系统柔性鱼栅栏 (FFF) 中评估了河豚的下游通过行为。研究了在电缆间距、暴露角度和接近速度变化的情况下,鱼类保护和引导效率。使用体长在 100 到 200 毫米之间的野生出生并带有 PIT 标记的鲢鱼 (Squalius chephalus)、鳟鱼 (Thymallus thymallus)、褐鳟鱼 (Salmo trutta) 和虹鳟鱼 (Oncorhynchus mykiss) 进行了实验。结果表明,鱼类保护效率主要取决于电缆间距,并且在鱼类之间变化很大。虽然所有鱼 (100%) 都被阻止以 10 毫米的间距通过 FFF,在 20 毫米间距(83% 的鲢鱼、59% 的鳟鱼和 26% 的鳟鱼)时效果要差得多。使用多项逻辑回归模型确定了暴露角度、接近速度和鱼长的影响:鱼类保护效率随着鱼长度的增加和鱼和鳟鱼的接近速度(特别是最高角度)的增加而显着增加。增加流速会引起电缆振动,可能会触发回避行为。旁路入口处不利的水力条件(接近速度为 0.65 m s-1,速度变化或湍流)对所有鱼类的旁路效率产生负面影响,指出下游洄游旁路的设计具有重要意义。使用多项逻辑回归模型确定了暴露角度、接近速度和鱼长的影响:鱼类保护效率随着鱼长度的增加和鱼和鳟鱼的接近速度(特别是最高角度)的增加而显着增加。增加流速会引起电缆振动,可能会触发回避行为。旁路入口处不利的水力条件(接近速度为 0.65 m s-1,速度变化或湍流)对所有鱼类的旁路效率产生负面影响,指出下游洄游旁路的设计具有重要意义。使用多项逻辑回归模型确定了暴露角度、接近速度和鱼长的影响:鱼类保护效率随着鱼长度的增加和鱼和鳟鱼的接近速度(特别是最高角度)的增加而显着增加。增加流速会引起电缆振动,可能会触发回避行为。旁路入口处不利的水力条件(接近速度为 0.65 m s-1,速度变化或湍流)对所有鱼类的旁路效率产生负面影响,指出下游洄游旁路的设计具有重要意义。鱼类保护效率随着鱼类长度的增加和鱼类接近速度的增加(尤其是最高角度)而显着增加。增加流速会引起电缆振动,可能会触发回避行为。旁路入口处不利的水力条件(接近速度为 0.65 m s-1,速度变化或湍流)对所有鱼类的旁路效率产生负面影响,指出下游洄游旁路的设计具有重要意义。鱼类保护效率随着鱼类长度的增加和鱼类接近速度的增加(尤其是最高角度)而显着增加。增加流速会引起电缆振动,可能会触发回避行为。旁路入口处不利的水力条件(接近速度为 0.65 m s-1,速度变化或湍流)对所有鱼类的旁路效率产生负面影响,指出下游洄游旁路的设计具有重要意义。
更新日期:2020-01-01
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