• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.893-897
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• 2004

본 연구는 아이스하버 형태의 어도를 조립식으로 개발하여 실제 현장에 적용하기에 앞서 유량 변화에 따라 어도내 유속 및 유황변화를 조사하고 어도의 배열을 조정하여 어도의 현장적용성을 검토하기 위하여 실시하였다. 모형 월류수심이 40cm(현장 20cm)일 때 상류부는 어류가 소상하기에 적합한 유속을 나타내었고 하류부의 가장 낮은 월류부(좌측열)에서는 어류 소상에 다소 지장을 주는 유속변화를 보였다. 그러나 좌측열을 제외한 우측열과 중간열에서는 어류 이동 및 소상에 적절한 유속변화를 나타내고 있는 것으로 보아 본 어도는 유량 증가에 따라 월류 유속이 증가하여도 월류벽이 높은 구간에서는 유속이 증가폭이 크지 않기 때문에 수위변화에 대응력을 가지는 것으로 판단된다. 다양한 배열로 어도를 설치하면 유속이 느린 어도 구간은 어도 유인수로로서의 역할을 할 수 있으므로 어도내의 다양한 유속은 어류 소상에 유리하게 작용한 것으로 평가된다. 어도의 배열은 월류부의 높이가 높은 것을 좌${\cdot}$우측열에 배열하고 낮은 것을 중간열에 배열하면 갈수량에 대한 대응력이 증가하는 것으로 나타났다. 잠공은 하천의 유량 조건이 좋을 때보다 갈수기나 홍수기에 어류가 소상하는 통로의 역할을 할 수 있을 것으로 판단된다. 따라서, 본 어도는 다양한 월류벽의 배열로 하천의 수위변화에 대한 대응력을 가지고 있으며 구조적으로 견고하여 우리나라 하천 상황에 적절한 어도로 판단된다.

• Journal of Korea Water Resources Association
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• v.55 no.1
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• pp.33-42
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• 2022

In this study, flow patterns in the ice-harbor fishway were analyzed according to fluctuations of the upstream water level, an increase of weir interval, and the presence or absence of orifices using a three-dimensional commercial numerical model, Flow-3D. In order to prove the suitability of the numerical simulation results, the flow velocity and flow rate at the exit of the fishway were observed using a 3D ultrasonic velocimetry on an actual ice-harbor fishway installed downstream of the Daegok bridge in Gyeongan-Cheon. Four types of turbulence modules can be selected for the Flow-3D model. As a result of verification with observation data, the RNG model best described the flow characteristics in the ice-harbor fishway. The velocity structure in the fishway according to fluctuations of the upstream water level was simulated. The results showed that the plunging flow and the streaming flow were mixed at the lowest water level. When the water level increased about 10 cm or more from the lowest water level, the plunging flow disappeared in all pools and only the streaming flow occurred. Contrary to expectations, even when the water level is rose a little, the flow simply occurred mainly on the streaming flow. If the interval between the weirs is increased, both the plunging flow and the streaming flow are showed continued even if the water level rises. In addition, compared to the case where there are no orifices at the bottom of the weirs, the plunging flow tends to be generated in several pools. It is necessary to prevent blocking orifices through active management so that various flow patterns in the fishway can be generated in multiple pools.

• Journal of Korea Water Resources Association
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• v.52 no.spc2
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• pp.855-863
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• 2019

The efficiency of fishway installed in rivers can be directly evaluated by means of fish monitoring. On the other hand, when it is difficult to monitor the fish in certain conditions, or when planning a fishway, the efficiency can be evaluated indirectly through the hydraulic analysis. In this study, the hydraulic analysis technique for evaluating the efficiency of a fishway was presented. The River-2D model with the fish physical habitat module was used for the analysis of the attraction efficiency, and the weighted usable area was proposed as an index of the efficiency. In the analysis of passage efficiency, the three-dimensional model, Flow-3D, was used as an evaluation tool to describe the fluid behavior on a hydraulic structure with free surface. The ice-harbor type fishway at Baekgok weir in the Deokcheon River was selected as a test-site, and the efficiency was estimated using the hydraulic analysis. And then it was compared with fish monitoring data acquired from the river. As a result, it is difficult to replace the hydraulic analysis results with the efficiency quantitatively, but it can help to grasp the general tendency.