EFFECT OF LOCATION OF NOTCH ON MIGRATION RATE IN POOL-AND-WEIR FISHWAY
EFFECT OF LOCATION OF NOTCH ON MIGRATION RATE IN POOL-AND-WEIR FISHWAY
复制标题
池堰鱼道中缺口位置对游移速率的影响
DOI：
10.2208/prohe.51.1279
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Yohei Iiguni
中科院分区：
文献类型：
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作者：
K. Onitsuka;J. Akiyama;Daisuke Kiuchi;Yasuyuki Takahashi;Yohei Iiguni
在水坝、瀑布和急流处修建了鱼道，以方便鱼类洄游。虽然鱼道的类型很多，但日本河流中安装的鱼道大多数属于池堰式。上游和下游之间的水位差、水流深度与流向池长度之间的比率、堰的形状等几个值对迁移的适宜性有影响。中村特别指出，迁移的适宜性受缺口位置的影响很大。然而，这一指示没有得到定量验证。在这项研究中，用两套数码摄像机记录了洄游鱼类的轨迹，并在具有交替缺口和单侧缺口的池堰鱼道中进行了速度测量。研究发现，交替切口和单侧切口的轨迹是不同的。这是因为池中的速度和方向彼此不同。
Fishways have been constructed to facilitate migration of fish at dams, waterfalls and rapids. Although a lot of types of fishway are suggested, most of the fishways installed in Japanese rivers belong to the pool-and-weir type. Several values such as a water level difference between the upstream and downstream, the ratio between the flow depth and streamwise pool length, the shape of the weir and so on have an influence on the suitability of migration. In particular, Nakamura pointed out that the suitability of migration is greatly affected by the location of notch. However, this indication is not verified quantitatively. In this study, the trajectories of the migrating fish were recorded with two sets of digital video cameras and also velocity measurements were conducted in the pool-and-weir fishway with alternate notch and also with one-sided notch. It was found that the trajectories are different between alternate notch case and one-sided notch case. This is because the velocity and its direction in the pool is different from each other.