60results about How to "Improve fish passing efficiency" patented technology

The invention relates to a method and system for luring fishes with flow jetting. The system comprises a fish blocking flow jetting pipe arranged on the up stream of a fishway inlet. A plurality of fish blocking flow jetting holes are formed in a straight-line mode in the length direction of the fish blocking flow jetting pipe, and alpha fish blocking angles are formed between the outlet flow jetting lines of the fish blocking flow jetting holes and a riverway. A plurality of fish luring flow jetting pipes are arranged on the down stream of the fishway inlet along the riverway, a plurality of fish luring flow jetting holes are formed in the fish luring flow jetting pipes in a straight-line mode in the length directions of the fish luring flow jetting pipes, and gamma fish luring angles are formed between the outlet flow jetting lines of the fish luring flow jetting holes and the riverway. According to the method and system, fish blocking flow jetting and fish luring flow jetting are generated through flowing of water flow, and the fishes are prevented from going over the fishway inlet through fish blocking flow jetting, guided by fish luring flow jetting to enter a fishway and prevented from losing the direction. Compared with a traditional water replenishment fish luring mode, water consumption of fish blocking flow jetting and fish luring flow jetting is remarkably reduced, a large number of water conservancy resources are saved, and the method and system are simple in project construction, convenient to operate and suitable for various water conservancy projects.

The invention discloses a method for attracting fish with temperature rise in a river channel, which includes: opening the flow control gate, the water flow in the river channel enters the heating system, and first enters the first-level heating room, the heating coil in the first-level heating room senses the incoming water, and the first-level heating room Start heating, and start heating when the heating coils in the heating chambers of other levels connected successively sense the water flow; the warm water heated by the multi-stage heating chamber is injected into the river channel through the flow chamber and the outlet pipe, so that the temperature of the river water begins to rise; In the heating system of the fishway mouth, the warm water heated by the multi-stage heating chamber passes through the flow chamber to the outlet pipe, and is injected into the river water around the fishway mouth from the outlet pipe; the temperature sensors in the river channel respectively sense the raised temperature and The temperature in the river has not risen; the intelligent temperature control system controls the opening or opening and closing of the flow control gate according to the temperature rise range of the river adjacent to the fishway mouth. According to the method for attracting fish by raising the temperature of the river course of the present invention, the sensitivity of fish to temperature is used to increase the fish passing rate in the fishway.

The invention discloses a method for attracting fish by raising the temperature of a fishway, comprising the steps of: S1: opening a flow control valve, and flowing hot water from a hot water source into a water injection pipe; S2: after the water injection pipe is filled with hot water, under the action of water pressure , hot water enters into the gear-like water injection chamber through the water injection branch pipe; S3: Driven by the external motor, the gear-like water injection chamber as the driving wheel drives the gear-like water injection chamber as the driven wheel to rotate through the chain, and the gear-like water injection chamber as the driven wheel rotates. With the rotation of the water injection chamber, the angle between the eccentric water injection hole on the gear-like water injection chamber and the vertical direction is constantly changing, and the hot water injected in the gear-like water injection chamber is supplied to the fishway through the water injection hole, thereby realizing the temperature of the water flow in the fishway. Uniform temperature rise; S4: The temperature sensor in the fishway and the temperature sensor in the river respectively sense the raised temperature in the fishway and the unincreased temperature in the river; S5: The intelligent temperature control system controls the flow rate according to the temperature rise range of the fishway. The opening or closing of the hot water channel of the control valve.

The invention provides a curve plotting method for adaptability of fish to hydrodynamic force parameters. The curve plotting method for the adaptability of the fish to the hydrodynamic force parameters includes: building a vertical seam type fishway model with three types of lead angles, and using the lead angles for manufacturing different feature flow fields; performing fish release tests and recording videos; obtaining features of the different feature flow fields; portioning a test area in the vertical seam type fishway model into different flow field areas; calculating a quantity ratio ofthe test fish in the different flow field areas; and plotting a curve of the adaptability of the fish to the hydrodynamic force parameters according to the quantity ratio of the test fish in the different flow field areas. The curve plotting method for the adaptability of the fish to the hydrodynamic force parameters can confirm the range of each favorite key hydraulic power factor in successfulupstream swimming of target fish species, is used for guiding and optimizing hydrodynamic design of a vertical seam type fishway, improves fish passing efficiency, really develops function of an ecological rehabilitation project of the vertical seam type fishway, and has certain scientific significance and reference value, and furthermore can be popularized and used in fishway hydraulics study taking various fish species as fish passing objects.

The invention discloses a driving assistance type vertical-seam fishway structure and a fish gathering method thereof. The driving assistance type vertical-seam fishway structure comprises a bottom plate, a side wall, multiple long separating plates, multiple short separating plates and multiple driving assistance platforms, wherein a fishway is divided into multiple pool chambers by the long separating plates and the short separating plates, and fish passing vertical seams are reserved between the long separating plates and the short separating plates; each driving assistance platform is formed by a J-shaped plate, an arc-shaped separating plate, a water outlet seam, a water supplementation seam and a small-sized wave generation machine, and arresting nets are arranged at the outer sides of the arc-shaped separating plates. According to the driving assistance type vertical-seam fishway structure disclosed by the invention, the water flow in the pool chambers and the fish passing situation in the positions of the fish passing vertical seams can be monitored in real time by cameras which are arranged in the long separating plates, images can be synchronously transmitted to a computer automatic control system for being analyzed, a command for regulating and controlling the frequency of the small-sized wave generation machine can be sent from the computer automatic control system to the small-sized wave generation machine, the water flow which is suitable for fish migration and the water sound which is capable of attracting fish to swim upstream can be formed in the corresponding pool chamber, the fish passing efficiency of a traditional vertical-seam fishway can be obviously increased, the influence on the fish migration caused by hydro-power and hydraulic engineering can be reduced, and the driving assistance type vertical-seam fishway structure is beneficial for ecological protection for a river.

The invention discloses a trench type fish collection front room suitable for different water depth variation amplitudes of a high-head dam and belongs to the field of water conservancy facilities. The trench type fish collection front room comprises a fish collecting and luring system and a water supply system, wherein the fish collecting and luring system mainly comprises a long bottom plate anda sloped bottom plate, a fish-collecting transition section, two fish-collecting retaining walls, two energy dissipation gratings, a break joint type control gate, a fish collection tank and a fish collection inlet; the water supply system comprises a power station tail water outlet counter-slope, a water supply open channel section, a water supply closed conduit section, a water supply outlet section and a fish collection outlet. During the operation of the trench type fish collection front room disclosed by the invention, power station tail water flow serves as fish-luring water flow and water supply flow, the flow and the flow velocity of the fish collection front room are controlled by adjusting relative positions of two rows of vertically arranged cross joints of a cross joint type control gate, fishes are lured to enter the fish collection tank of the fish collection front room, the fish collecting and luring effects are obvious and high-efficiency, and the fish collection frontroom has the advantage of being adaptive to great water level variation amplitude and is suitable for popularization and application in water conservancy projects.