CN-117051760-B - Ecological flow discharge facility with fishway and construction method thereof

CN117051760BCN 117051760 BCN117051760 BCN 117051760BCN-117051760-B

Abstract

The invention belongs to the technical field of hydraulic engineering and environmental protection engineering facilities, and particularly relates to an ecological flow discharge facility with a fishway and a construction method thereof. The invention aims at a reconstruction hydraulic engineering with ecological requirements, a fishway and an ecological flow discharge system adopt a short tunnel dam-winding scheme, the installation of a water retaining gate is completed before flood by using a rock plug, the flood risk of the construction period increased by reconstruction and expansion of a block and a water discharge building is avoided, the arrangement of fishway engineering and ecological flow discharge facility lines is integrally considered, the fishway section adopts the arrangement of a fishway under an upper ecological discharge pipe, the tunnel section type is beneficial to surrounding rock stabilization, the construction difficulty is small, the excavation supporting quantity is small, the tunnel section adopts the illumination of a sunlight optical fiber leading-in system, the fish-passing condition of the fishway section is more similar to the natural condition, and the adverse effect of the fishway section engineering on fish migration is relieved to the greatest extent.

Inventors

WANG JIANYING
YIN JIANAN
ZHOU BINGHAO
BIAN XUNWEN
Ning Weiqi
FU XIN
WANG CHAO
WU YUNZHENG

Assignees

中水东北勘测设计研究有限责任公司

Dates

Publication Date: 20260512
Application Date: 20230927

Claims (7)

1. The construction method of the ecological flow discharging facility with the fishway is characterized in that the ecological flow discharging facility with the fishway comprises a fishway inlet, a fishway downstream section, a fishway and ecological flow discharging facility tunnel section, a fishway flood control gate, a fishway upstream section, a fishway outlet, an ecological flow discharging facility water inlet, an ecological flow discharging facility accident access door, an ecological discharge pipe, an ecological flow energy dissipation flow regulating valve, a tunnel section fishway and a sunlight optical fiber lighting system; the fishway outlet and the water inlet of the ecological flow discharging facility are positioned below the normal water storage level of the reservoir area of the upper reservoir; the system comprises a fish channel, an ecological flow discharging facility tunnel section, a solar optical fiber lighting system, a fish channel, an ecological flow discharging facility tunnel section, a fish channel, an ecological flow discharging facility tunnel section, a fish channel flood control gate, an ecological flow discharging facility water inlet and an ecological flow discharging facility accident access door, wherein the fish channel and the ecological flow discharging facility tunnel section are a shared tunnel of the fish channel section and the ecological discharging facility tunnel section; the construction method comprises the following steps: S1, analyzing, calculating and determining a relation curve of water level to a guaranteed rate in a reservoir area, determining a minimum water level H1 (m) of a fishway outlet by taking a water level with the guaranteed rate of 90%, and taking the first outlet bottom plate elevation A1=H21-1 (m) of the fishway; s2, determining a tunnel outlet elevation A3 (m) of a tunnel section of the fishway and ecological flow discharge facility according to the design of the full-pressure ecological discharge tunnel; S3, considering ecological requirements of fishes, arranging the tunnel section as short as possible, and not exceeding 300m, so that the fish passing condition of the tunnel section of the fishway is more similar to the natural condition, the adverse effect of the tunnel section of the fishway and ecological flow discharge facility on fish migration is relieved to the greatest extent, and a sunlight optical fiber illumination system is arranged in the top area of the tunnel to provide illumination for the tunnel; s4, determining the section sizes of the fishways and the tunnel sections of the ecological discharge pipe and the ecological flow discharge facility according to the sections of the fishways and the sections of the fishways, wherein the ratio of the height H to the width W of the tunnel is not more than 2.5, the fishways of the tunnel sections are arranged above, and the ecological discharge pipe is arranged below; s5, fully considering the topography and geological conditions of the upstream section of the fishway, and determining the type of the upstream section by adopting a rock anchor or pile foundation or a digging and filling mode; S6, under the condition of meeting the functional target of the hub reservoir, adopting joint scheduling with an upstream cascade reservoir and a downstream cascade reservoir to reduce the water level of the reservoir in the construction period of the reconstruction and expansion project as much as possible, and determining the top elevation of the cofferdam design in the construction period through flood regulation calculation; And S7, controlling and selecting the ratio of the rock plug thickness to the bottom surface diameter according to 1-1.5 according to the tunnel section size determined in the S4, adopting cascade reservoir joint scheduling to reduce the reservoir water level after the first year of flood in the construction period, performing upstream cofferdam filling, fishway and ecological flow discharge facility tunnel section downstream section construction, and performing construction on the rock plug after the fishway flood control gate and ecological flow discharge facility accident access door are installed.
2. The construction method according to claim 1, wherein the total length of the tunnel section of the fishway and ecological flow discharge facility is not more than 300m.
3. The construction method according to claim 1, wherein the ratio of the height H to the width W in the cross-sectional dimension of the tunnel section of the fishway and ecological flow discharge facility is not more than 2.5.
4. The method of claim 1, wherein the fishway and the ecological vent pipe are independent of each other and the ecological flow bleed facility water outlet is located on the upstream side of the fishway inlet.
5. The method of claim 1, further comprising an upstream cofferdam, a dam, and a hydroelectric power plant, wherein the fishway upstream section is disposed proximate the upstream cofferdam, and wherein the fishway and ecological flow discharge facility tunnel section is disposed in a region of the hydroelectric power plant on a side remote from the dam.
6. The construction method according to claim 1, wherein in step S2, the specific determination method of the tunnel section exit elevation A3 (m) of the fishway and ecological flow discharge facility is: 1) Under the working conditions of the lowest running water level H2 (m) and the maximum discharging ecological flow Q (m 3/s) in the reservoir area, adopting a formula Determining the minimum submerged depth S (m) of a water inlet of the ecological flow discharge facility; 2) Determining the height d of an accident access door gate hole of an ecological flow discharge facility according to the design of full-pressure flow, wherein the width of the gate hole is b, and the average flow velocity of the section of the gate hole (m/s); 3) Determining the elevation A2=H2-S-d (m) of the water inlet bottom plate of the ecological flow discharge facility; 4) And determining the tunneling height A3=min (A1, A2) of the tunnel section of the fishway and the ecological flow discharge facility.
7. The method according to claim 6, wherein the coefficient C is 0.55 in the case of symmetrical and forward flow and 0.73 in the other case.

Description

Ecological flow discharge facility with fishway and construction method thereof Technical Field The invention belongs to the technical field of hydraulic engineering and environmental protection engineering facilities, and particularly relates to an ecological flow discharge facility with a fishway and a construction method thereof. Background At present, a plurality of early-established hydropower stations are not provided with special ecological flow discharge facilities so as to influence the downstream ecological base flow to be substandard, and are not provided with special fish reproduction channels so as to influence the inhabitation and quantity of fish. Further damaging the entire ecological chain. According to the current environmental protection requirements, it is necessary to reconstruct and expand the established hydraulic engineering with ecological requirements, and newly build a fishway and an ecological flow discharge facility. However, under the condition that the existing functions of the reservoir hub are guaranteed, the water level in the reservoir area is higher, the water level of the reservoir is close to the normal water level, the water level of the reservoir cannot be reduced, and the design and construction difficulties of the outlet of the fishway and the water inlet of the ecological flow drainage facility are high. The hydraulic building is transformed, the construction difficulty of cross connection design with the existing building is high, the influence on other buildings is large, the filling requirement on the upstream cofferdam is high, the flood risk is high, and the engineering investment is obviously increased. Based on this, the inventors have desired to design an ecological flow rate discharge facility having a fishway and a construction method thereof to solve the above-described problems. Disclosure of Invention The invention aims to overcome the problems in the prior art and provide an ecological flow discharge facility with a fishway and a construction method thereof. In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme: The invention provides an ecological flow discharge facility with a fishway, which comprises a fishway inlet, a fishway downstream section, a fishway and ecological flow discharge facility tunnel section, a fishway flood control gate, a fishway upstream section, a fishway outlet, an ecological flow discharge facility water inlet, an ecological flow discharge facility accident access door, an ecological discharge pipe, an ecological flow energy dissipation flow regulation valve, a tunnel section fishway and a sunlight optical fiber lighting system; The solar optical fiber lighting system is positioned on the top arch of the tunnel and the ecological flow discharging facility tunnel section, the tail end outlet of the ecological discharging pipe is positioned on the upstream side of the tunnel inlet, a fishway downstream section is arranged between the fishway inlet and one end of the fishway and the ecological flow discharging facility tunnel section, the two ends of the fishway upstream section are respectively provided with a fishway outlet, and one end of the fishway upstream section, which is close to the fishway floodgate, is connected with the other end of the fishway and the ecological flow discharging facility. Further, in the ecological flow discharging facility with the fishway, the total length of the fishway and the tunnel section of the ecological flow discharging facility is less than or equal to 300m. Further, in the ecological flow discharging facility with the fishway, the ratio of the height H to the width W in the cross section dimension of the tunnel of the fishway and the ecological flow discharging facility tunnel section is less than or equal to 2.5. Further, in the ecological flow rate discharging facility with the fishway as described above, the fishway and the ecological discharging pipe are independent from each other, and the ecological flow rate discharging facility water outlet is located at the upstream side of the fishway inlet. Further, in the ecological flow discharging facility with the fishway, the ecological flow discharging facility further comprises an upstream cofferdam, a dam and a hydropower station factory building, the fishway upstream section is arranged close to the upstream cofferdam, and the fishway and the ecological flow discharging facility tunnel section are arranged in a side area of the hydropower station factory building far away from the dam. The invention also provides a construction method of the ecological flow discharge facility with the fishway, which comprises the following steps: S1, analyzing, calculating and determining a relation curve of water level to a guaranteed rate in a reservoir area, determining a minimum water level H1 (m) of a fishway outlet by taking a water level with the guaranteed rate of 90%,