US 2026/0125869 A1 · Auxiliary Facilities and Method for Fish Resource Recovery in Open Water Diversion Channel

Abstract

The present invention relates to an auxiliary method and facility for fish resource recovery in an open water diversion channel, which includes: an inlet of the attraction channel arranged on a side wall of the open water diversion channel, a slope provided inside the attraction channel, wherein a lower end of the slope is located inside the open water diversion channel, and a higher end of the slope is located outside the open water diversion channel, an attracted water flow is arranged at the higher end of the slope to guide fish into the attraction channel and an outlet of the attraction channel is connected to a still water zone, wherein the still water zone is provided with a release device. The present invention effectively guides a significant number of fish that have mistakenly entered the open water diversion channel out of the channel through attracted attraction. This approach not only protects fish resources but also prevents channel blockages caused by massive fish intake, thereby avoiding power plant shutdown incidents, thus preventing substantial economic losses and, more importantly, ensures the operational safety of the power plant.

An auxiliary method for fish resource recovery in an open water diversion channel, wherein an auxiliary facility for fish resource recovery in the open water diversion channel is used for the auxiliary method, the auxiliary facility comprising:

an inlet of the attraction channel arranged on a side wall of the open water diversion channel, a slope provided inside the attraction channel, wherein a lower end of the slope is located inside the open water diversion channel, and a higher end of the slope is located outside the open water diversion channel, an attracted water flow is arranged at the higher end of the slope to guide fish into the attraction channel and an outlet of the attraction channel is connected to a still water zone, wherein the still water zone is provided with a release device, an interception net arranged downstream of the inlet of the attraction channel;
and the auxiliary method comprises the following steps:
step 1:
establishing a water intake zone three-dimensional flow field model:
establishing the water intake zone three-dimensional flow field model which includes the open water diversion channel, acquiring topography of the water intake zone, ambient flow conditions, shoreline characteristics, as well as the design dimensions, water intake flow rate, intake flow velocity, and intake depth of the open water diversion channel, establishing a water intake flow field model, dividing computational grids, determining boundary conditions and initial conditions for flow field simulation, and selecting appropriate computational parameters to simulate flow field variations including the open water diversion channel and its affected water area;
wherein the governing equations for flow field computation are as follows:
∇
·
u
=
0
∂
u
∂
t
+
u
·
∇
u
=
-
∇
p
ρ
+
1
ρ
⁢
∇
·
(
μ
eff
⁢
∇
u
)
-
2
3
⁢
∇
·
(
kI
)
∂
∂
t
(
ρ
⁢
k
)
+
∇
·
(
ρ
⁢
ku
)
=
∇
·
(
α
k
⁢
μ
eff
⁢
∇
k
)
+
G
k
-
ρε
∂
∂
t
(
ρε
)
+
∇
·
(
ρε
⁢
u
)
=
∇
·
(
α
ε
⁢
μ
eff
⁢
∇
ε
)
+
C
1
⁢
ε
⁢
ε
k
⁢
G
k
-
ρ
⁢
C
2
⁢
ε
⁢
ε
2
k
wherein u is a time-averaged velocity, t is time, p is pressure, ρ is water density, μeff is a turbulent effective viscosity, k is turbulent kinetic energy, I is second-order unit tensor, αk is a turbulent kinetic energy Prandtl number, εε is a turbulent dissipation rate, αε is a turbulent dissipation rate Prandtl number, Gk is a turbulent kinetic energy generation term caused by an average velocity gradient, and C1ε and C2ε are constant coefficients;
step 2:
validating the flow field model based on physical model experiments:
constructing a corresponding geometrically scaled physical model indoors, and measuring the flow velocity and direction at characteristic cross-sections or points within the attraction channel, comparing these measurements with simulation results of the mathematical model for validation, wherein if the calculated values align well with the measured values, the established mathematical model can reflect basic characteristics of flow field distribution in the open water diversion channel, based on this, the location where fish resource recovery facilities are located in the open water diversion channel, as well as the water flow rate and configuration dimensions of the attracted water flow can be determined;
step 3:
selecting the location of the attraction channel:
based on flow field distribution analysis and considering swimming capabilities and behavioral characteristics of fish entering the channel, locating the inlet of the attraction channel near a bank in a low-velocity area at the center of a recirculation zone where recirculation is relatively weak, wherein the outlet of the attraction channel is placed in a near-bank area outside the channel where the water flow is slow and stable, serving as a temporary holding area for fish before release;
step 4:
determining configuration, dimensions, and attracted water flow rate of the attraction channel:
based on flow field distribution analysis, combined with the swimming capabilities and behavioral characteristics of fish entering the channel, as well as the flow velocity and flow patterns within the attraction channel, comprehensively determining the configuration, dimensions, and the attracted water flow rate of the attraction channel;
step 5:
modifying a physical model experiment for further flow field verification:
according to the recommended attraction channel design proposed in step 4, modifying the physical model in step 2 by adding the attraction channel and a water supply system at the corresponding location in the channel, then conducting the physical model experiment to further study and analyze the flow field, and verifying suitability of the fish resource recovery facilities;
step 6:
providing auxiliary interception facilities:
based on flow field analysis results in the channel, installing an auxiliary interception net downstream of the inlet of the attraction channel in an area with relatively uniform and low-velocity flow, wherein the interception net spans the entire cross-section, encouraging fish to more easily find the inlet of the attraction channel while swimming along the net;
and
step 7:
fish attraction and recovery process:
activating the attraction channel, creating a jet flow from the recirculation zone to a main flow zone at the inlet of the attraction channel;
utilizing fish's innate tendency to swim against currents and support of auxiliary facilities, guiding the fish in both the main flow and recirculation zones toward the inlet of the attraction channel, wherein the slope within the attraction channel generates a stable, uniformly graded reverse flow field, attracting fish to swim upstream to the still water zone at the outlet of the attraction channel, then the fish in the still water zone are released into natural waters outside the channel via the release device.

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Auxiliary Facilities and Method for Fish Resource Recovery in Open Water Diversion Channel

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Auxiliary Facilities and Method for Fish Resource Recovery in Open Water Diversion Channel

Life of this patent

Abstract

Claims7