The meander-type fish pass is a slotted fishway characterised by the exclusive use of rounded and smooth components. Due to the specific geometry and arrangement of the basins, which differ considerably from the conventional vertical slot pass, there are significantly different hydraulic conditions. The water flow is guided along the basin walls by means of a dominant main current while the water body is much calmer towards the centre of the basin, where very low flow velocities are found. A detailed assessment of the functionality is currently impossible due to the small number of surveys of fish passage hitherto carried out. However, considerable potential is indicated by the high passage rates at some sites and the lack of selectivity with regard to species and small fish, together with the design advantages and the adaptation possibilities after construction work is completed. In this study, we offer some recommendations for dimensioning to enable this potential to be exploited. These are oriented around recommendations for conventional vertical slot passes regarding basin size, flow depth and slot width. Due to the great potential of the meander-type fish pass, it is desirable to construct still more individual pilot passes to implement comprehensive surveys of fish passage on a sound methodological basis.

中文翻译：

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曲流型鱼道：传统垂直槽道的替代品

曲流型鱼道是一种槽形鱼道，其特点是专门使用圆形和光滑的部件。由于盆地的特定几何形状和布置与传统的垂直槽道有很大不同，因此存在显着不同的水力条件。水流通过主导的主流沿着盆地壁被引导，而朝向盆地中心的水体平静得多，在那里发现流速非常低。由于迄今为止进行的鱼类通道调查数量很少，因此目前无法对功能进行详细评估。然而，一些地点的高通过率以及对物种和小鱼缺乏选择性，表明具有相当大的潜力，连同设计优势和施工工作完成后的适应可能性。在这项研究中，我们提供了一些关于尺寸标注的建议，以实现这一潜力的开发。这些是围绕传统垂直槽道的建议而定的，包括盆地尺寸、流动深度和槽宽。由于曲流型鱼道的巨大潜力，需要构建更多单独的试验道，以在健全的方法基础上对鱼道进行综合调查。