5results about How to "Improve fish passing efficiency" patented technology

The invention discloses a'seam-hole-weir 'combined fishway with four fish passing channels, and belongs to the field of fishway design. Four vertical seams, two inclined transverse baffles with bottom holes, two inclined rectangular weirs with bottom holes and two rectangular energy dissipation piers are arranged in each pool chamber, so that four fish passing channels are provided for migration and upstream of fishes, a more sufficient migration and upstream space is provided for the fishes, and the survival rate of the fishes is increased. And the flow velocity and turbulent fluctuation of the main flow area in the pool chamber are reduced by sharing the flow, and the flow velocity and turbulent fluctuation of the main flow area can be further reduced by promoting transverse / longitudinal diffusion and energy consumption of water flow. And the upstream success rate of the whole fish community (including fishes with strong swimming ability and fishes with weak swimming ability) can be improved. The'seam-hole-weir 'combined fishway with the four fish passing channels, provided by the invention, is beneficial to reducing the adverse effects of water conservancy projects on the ecological environment of a river, biological diversity and fishery resources.

The invention relates to the technical field of water conservancy projects, in particular to a fishway pool chamber water depth control system and method. The method comprises the following steps: calculating the flow of the Danille abrupt slope fishway through the amplitude of the upstream water level of the river reach of the dam hub. The ultrasonic fish finder is used for recognizing the types, body types and the number of fishes coming from the fishway inlet. And calculating the running flow, the flow velocity and the water depth of the main fishway in combination with meteorological and hydrological information and fish data. And according to the flow of the Danille steep slope fishway and the running flow of the main fishway, auxiliary regulation and control flow is calculated. And the opening degree of the gate is calculated according to the auxiliary regulation and control flow and the water level information of the movable gate, and an instruction is sent to the opening degree controller. In the opening process, the water flow characteristics of the main fishway and the Danille steep slope fishway are monitored, and the fish dynamic state is monitored through the ultrasonic fish finder. And comparing the actual water flow characteristic with an expected value, sending an opening degree optimization instruction, and repeatedly adjusting until the expected water flow characteristic and the fish passing rate are achieved, so that the fish upstream tracing effect is improved.

The application discloses a two-way fish lifting machine fish passing system and method integrating fish size screening and circulating transportation, and belongs to the technical field of fish passing facilities. The system comprises a fish lifting machine device, a screening assembly, a circulating fish storage assembly, a fish driving assembly and a transportation assembly. The fish lifting machine device is provided with an uplink fish passing channel and a downlink fish passing channel. The screening assembly selectively allows fish of different sizes to pass. The fish driving assembly gently drives the fish to switchable fish storage units. The transportation assembly is connected with the full fish storage units and transports the fish to a preset releasing point. The method comprises the steps of mode selection, size screening, fish driving and collecting, box switching, unmanned transportation and resetting circulation. The application can consider both uplink migration and downlink migration, reduces the turning back and retention, and improves the fish passing continuity and ecological transportation efficiency.

The application relates to a device for attracting fish and continuously circulating and lifting fish in a ring-shaped track, and relates to the technical field of fish passing through a high dam of a hydropower station. The device comprises a fish-attracting channel, a fish deflecting weir and a fish lifting assembly. The fish-attracting channel is located downstream of the high dam. The fish deflecting weir is arranged in the fish-attracting channel. The fish lifting assembly comprises fish conveying boxes, a track and a power unit. The track is arranged on the high dam and downstream of the high dam, the track is ring-shaped and extends downwards along the high dam to the fish-attracting channel, at least two fish conveying boxes are arranged and used for conveying fish entering the fish-attracting channel, each fish conveying box is hung below the track, and the power unit is used for driving the fish conveying boxes to move along the track. The device has the effects of continuously circulating and lifting fish and improving the fish passing efficiency.

The present application relates to the technical field of ecological protection of water conservancy and hydropower, and particularly relates to a fishway with rotary subsidence type rest pools, which comprises a vertical joint type fishway arranged on a bank slope on one side of a dam, and a fishway pool chamber is formed between two adjacent fishway partitions of the vertical joint type fishway; the vertical joint type fishway further comprises a plurality of rest pools arranged at intervals along the running direction of the vertical joint type fishway; the rest pools are arranged at positions below the fishway bottom plate; an opening is arranged on one fishway side wall to serve as a rest pool inlet, and the rest pool inlet and the rest pool are connected through a first arc-shaped channel; an opening is arranged on the other fishway side wall to serve as a rest pool outlet, and the rest pool outlet and the rest pool are connected through a second arc-shaped channel; a flow guide pipe is connected to each rest pool to guide water in the rest pool to a river channel downstream of the dam. The rest pools of the fishway are arranged in a rotary subsidence type, which breaks the industry problem of long fishway layout caused by the series arrangement of the traditional rest pools and the fishway pool chambers.