Fishway outlet adapting to water level change and design method
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A technology of changing water level and fish pass, applied in the fields of hydraulic facilities and design for protecting fish ecology, environmental protection facilities and design, which can solve the instability of water flow, affect the efficiency of fish passing, and reduce the stability of water flow in fish pass. issues of sex
Inactive Publication Date: 2016-10-26
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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[0003] For vertical-slotted fishways with multiple elevations, large and rapid changes in the upstream water level of hydraulic structures (especially daily regulation reservoirs) will cause frequent switching of outlet gates, thus reducing the water flow in the fishway. The stability of the state is not conducive to the upward tracing of fish
In addition, the multi-exit vertical slot fishway needs to arrange multiple gates and corresponding automatic control systems, which increases the investment cost of the early stage construction and the later equipment operation and maintenance costs, and increases the difficulty of fishway construction and operation management
[0004] Based on the current research results, in order to adapt to the large fluctuations in the upstream water level of hydraulic structures, the vertical slot fishway needs to be equipped with multiple outlets, but the switching between different outlets makes the operation process of the fishway too complicated, and causes some The instability of the water flow during the operation period affects the fish passing efficiency
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Embodiment 1
[0035] Present embodiment is a kind of fishway outlet that adapts to water level variation, as figure 1 , 2 shown. figure 1 , 2 Shown in is the example that this embodiment is applied in the vertical slot type fishway. This embodiment includes: an overflow section 2 connected with a fishway 1 formed in series by a plurality of conventional pools, the overflow section is connected with a traveling section 3, and the overflow section is composed of a plurality of lengths and widths compared with conventional The same overflow pools of the pools are connected to form, and fish passing facilities 4 are provided between the fishway and the overflow section, between the overflow section and the traveling section, between each conventional pool, and between each overflow pool; The width of the traveling section is the same as that of the conventional pool, and the height of the side wall of the traveling section is the sum of the variable water level difference of the upstream r...
Embodiment 2
[0061] This embodiment is an improvement of the first embodiment, and is a refinement of the second embodiment about fish passing facilities. The fish passing facility described in the present embodiment comprises: guide plate 401 and dividing plate 403, and guiding plate and dividing plate cooperate to form vertical seam 402, as figure 1 shown.
[0062] The fishway described in this embodiment uses a vertical slit fishway, using partitions and guide plates to form a vertical slit, allowing water to pass through it, and the bottom of each conventional pool is continuously raised, so that fish can easily into the upstream reservoir.
Embodiment 3
[0064] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the overflow port. The overflow port described in this embodiment is one of a rectangular notch, a triangular notch, and a circular notch, and the overflow port is provided with a fishing net 501, such as image 3 shown.
[0065] The length of the rectangular overflow port may be the same as the length of the overflow tank, which can actually be regarded as an overflow port formed by a short overflow wall. If it is other forms of overflow outlets, overflow outlets of various shapes can be excavated on the side walls of the overflow pool.
[0066] Because the water level in the overflow tank is determined by the overflow port. It is very easy for fish to jump out of the overflow pond from the overflow port, so a fish net can be set on the overflow port to place the fish to escape from the overflow pond, causing the fish to die.
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Abstract
The invention relates to a fishway outlet adapting to water level change and a design method. The fishway outlet comprises an overflow section; the overflow section is connected with an outlet section; the overflow section is formed by connecting multiple overflow pools having the same lengths and widths with conventional pools; fish passing facilities are respectively arranged between a fishway and the overflow section, between the overflow section and the outlet section, among all the conventional pools and all the overflow pools; the outlet section is as wide as the conventional pools; the height of a side wall of the outlet section is slightly higher than a highest value of a reservoir upstream water level change difference; and the bottoms of all the overflow pools at the outlet section and the overflow section are on the same horizontal line. The fishway outlet adopts the mode of arranging the overflow section and the outlet section in the fishway outlet to enable the continuously changed upstream reservoir water level to firstly arithmetically fall according to the water level change of each conventional pool of the fishway when flowing in the fishway, so that the flow of water entering the fishway cannot be increased to disturb the fish movement, and the overflow section for guaranteeing fishes to smoothly enter the upstream reservoir even if the water level of the upstream reservoir is changed is formed.
Description
technical field [0001] The invention relates to a fishway outlet and a design method adapted to water level fluctuations, a hydraulic facility and a design method, an environmental protection facility and a design method, and a hydraulic facility and a design method for protecting fish ecology. Background technique [0002] The upstream water level of many hydraulic structures is not a constant value, and often has a certain range of variation, especially for daily regulation reservoirs, which has a larger range of variation. The outlet of the vertical slot fishway is usually arranged upstream of the hydraulic structure, because the water depth variation is relatively small during normal operation, so the single outlet of the fishway will be difficult to adapt to the large fluctuation of the water level in the upstream reservoir area. At present, the measures taken to solve the above problems are to arrange multiple outlets with different elevations upstream of the vertical ...
Claims
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Application Information
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IPC IPC(8): E02B8/08
CPCY02A40/60E02B8/08
Inventor孙双科边永欢郑铁刚李广宁柳海涛姜涵张超
OwnerCHINA INST OF WATER RESOURCES & HYDROPOWER RES
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