51 results about "Stilling basin" patented technology

The invention discloses an underflow energy dissipation structure which comprises a stilling pool and a blow-off pipe. The water discharging pipe is located on one side of the stilling pool, the water inlet end of the stilling pool and the water inlet end of the water discharging pipe are communicated with a water recession structure of a water discharging building, the water outlet end of the water discharging pipe is arranged at the water outlet end of the stilling pool, and the water flow direction of the water outlet end of the water discharging pipe is opposite to the water flow direction of the water outlet end of the stilling pool. And the water outlet is used for forming opposite flushing with the discharged water flow of the stilling pool. According to the scheme, the problems that the energy dissipation effect is poor due to the fact that the stilling pool cannot be widened and the flow per unit width is large when an existing underflow energy dissipation structure is under the condition that the engineering topographic condition is limited, and later maintenance is tedious and difficult due to the fact that an auxiliary energy dissipater is additionally arranged can be solved.

The invention relates to the crossing field of water conservancy projects and computer simulation technologies, in particular to a river and canal protection engineering failure dynamic judgment and boundary updating method, which comprises the following steps of: marking a protection engineering area and setting the protection engineering area as a non-scour boundary during simulation initialization, and calculating hydrodynamic parameters such as water depth and flow velocity in each time step; comparing with the water depth-flow velocity relationship of a gabion, the design flood control standard of a stilling pool, the bottom elevation of an anti-scour wall and other anti-scour thresholds, if the thresholds are exceeded, judging that the boundary is invalid and dynamically updating the boundary to be a scoured boundary, and continuing simulation by combining dynamic dry and wet grid judgment and GPU parallel calculation; according to the method, water flow-sediment-riverbed-protection engineering collaborative simulation is achieved, the progressive damage process is precisely restored, the erosion and deposition simulation error is lower than 9%, universality is high, and a reliable quantification tool is provided for flood control safety evaluation and optimization design of wading projects such as river and canal crossing engineering.

A diversion-type energy dissipation structure for a rubber dam, belonging to the field of hydraulic engineering structures, includes at least one central pier and multiple toe piers. The central pier is located on the dam bag. A guide wall is connected downstream of the central pier, situated on the slope section of the stilling basin. Multiple toe piers are located downstream of the dam bag, also situated on the slope section of the stilling basin. The height of the toe piers is lower than the height of the guide wall. This invention, by employing the above structure, effectively reduces the length of the wind zone downstream of the rubber dam by setting multiple guide walls and toe piers, adjusting the flow direction and flow pattern of the water downstream of the dam, reducing unfavorable deflecting flows, and minimizing the impact of wind, waves, and river morphology on the dam bag. This effectively reduces the length of the wind zone downstream of the rubber dam, solves the problem of dam bag swaying, and improves the overall stability and durability of the rubber dam structure.

The invention discloses a graded protection method, device and equipment for landslide surges and a storage medium, and relates to the technical field of disaster prevention and control, the method performs continuous data processing and calculation through attenuation from landslide starting of a landslide mass to last surges to a shoreside, and considers the influence of the surges at different distances on the shoreside at the same time; and then different levels of protection measures are defined based on surge influences of different distances, for example, if the residual wave height is larger than three meters, a wave wall and a baffle sill are set, if the residual wave height ranges from one meter to three meters, a wave prevention forest is planted, and if the residual wave height is within one meter, only the baffle sill is laid. Data support can be provided for surge prevention and control, and a simple, convenient and accurate calculation method is provided.

The utility model discloses an adjustable sludge scraping device for a horizontal flow pool. The mud scraping plate is hinged to the bottom of a traveling crane mud discharging pipe supporting frame and extends to the bottom of a sedimentation tank, the air cylinder is arranged at the upper end of the traveling crane mud discharging pipe supporting frame and used for driving the mud scraping plate to turn over and swing, and the lifting rod and the adjusting connecting rod are arranged between the air cylinder and the mud scraping plate and can adjust the length. The floating connector is arranged between the adjusting connecting rod and the air cylinder, the first U-shaped groove buckle is arranged between the lifting rod and the mud scraping plate, and a second U-shaped groove buckle and a third U-shaped groove buckle are arranged between the mud scraping plate and the traveling crane mud discharging pipe supporting frame in a hinged mode. The air cylinder is adopted to swing and turn over the mud scraping plate through the lifting rod, so that the mud scraping plate swings to a vertical state to be in contact with the bottom surface of the sedimentation tank to realize sludge collection during cleaning, and the air cylinder pulls the mud scraping plate to turn over to a horizontal state during return stroke, so that floating sludge cannot be disturbed during return stroke movement, and the cleaning effect is improved.

The invention discloses a regulation and storage type water storage silt dam and a using method thereof, and relates to the field of hydraulic engineering, the regulation and storage type water storage silt dam comprises a dam body, the dam body is of a trapezoidal section concrete structure, a water storage cavity is formed in the dam body, and a filter body and a stilling pool are arranged on one side of an upstream dam slope of the dam body; the stilling pool is used for precipitating and layering the water body filtered by the filter body; the regulation and storage type water storage silt dam provided by the invention not only has the function of stopping flood, but also can store clear water obtained by filtering and precipitating through the filter body and the stilling basin by the water storage cavity in the silt dam, so that flood and rainwater which are high in silt content and difficult to use are effectively utilized, and the construction of the regulation and storage type water storage silt dam is very convenient to use. According to the utility model, the function of the original silt dam is exerted, the function of the reservoir is also exerted, the problem of water shortage of slope cropland, economic forests and upstream silt crops is solved to a certain extent, favorable conditions are created for intensive saving and utilization of water resources, and the problem of uneven distribution of the water resources is solved.

The invention relates to the technical field of stilling pools, in particular to an energy dissipation and flow stabilization device applied to a curve type stilling pool. The device comprises an inlet straight section, a bend section is fixedly connected to the end of the inlet straight section and used for guiding water flow to turn and forming a preset flow state, an outlet adjusting section is fixedly connected to the downstream end of the bend section, a plurality of T-shaped piers are arranged in the outlet adjusting section at intervals, and the T-shaped piers are arranged in the water flow direction. The flow state correcting device is used for correcting the flow state of water flow generating bias flow after bending of the bend section. Water flow enters the concave bank through the inlet straight section, then is guided to the outlet adjusting section through the curve section and the convex bank and finally is divided by the T-shaped piers for energy dissipation, the curve type stilling pool is matched with the T-shaped piers, the front edge structure can divide the concentrated water flow of the concave bank into a plurality of secondary flows, the turbulent shear area is greatly increased, the water flow energy dissipation rate is increased by 60%, and the energy dissipation rate is increased by 60%. And the flushing risk of a downstream riverbed is effectively reduced.

The application discloses a symmetric type backwash type bottom flow energy dissipation structure, which comprises a stilling basin and a water release pipe; the water inlet ends of the stilling basin and the water release pipe are communicated with the water recession structure of the water discharge building respectively, the water release pipe is provided with at least two water release pipe water outlet ends, the water release pipe water outlet ends are arranged at the water outlet ends of the stilling basin and are located at the symmetric positions of the left and right sides of the cross section of the water outlet ends of the stilling basin, the water flow directions of the water release pipe water outlet ends are opposite to the water flow directions of the water outlet ends of the stilling basin, and the water release pipe water outlet ends are used for forming the opposite flow with the water flow of the stilling basin. The above scheme can solve the problems that the flow speed is too large and the energy dissipation effect is poor due to the large single-width flow caused by the fact that the stilling basin cannot be widened under the condition that the engineering terrain condition is limited, and the problems of complicated and difficult later maintenance caused by the increase of the auxiliary energy dissipation work.

When conducting routine inspections of stilling ponds, a combination of a first-stage general inspection, a second-stage detailed inspection, and a third-stage precise inspection is used to efficiently collect, identify, and diagnose defects in the bottom slab of stilling ponds in a complex underwater environment. [Solution] The present application provides an intelligent patrol inspection method, apparatus, equipment, and medium for the stilling basin of a high-arch dam, relating to the technical field of underwater exploration. The method of the present application includes the steps of: collecting tomographic images of the bottom slab of the stilling basin with a first acquisition device; performing a first-stage general inspection based on the tomographic images; collecting external images of the bottom slab with a second acquisition device based on the patrol inspection results of the first-stage general inspection; obtaining patrol inspection results of a second-stage detailed inspection based on the external images; collecting fine images of the bottom slab with a third acquisition device based on the patrol inspection results of the second-stage detailed inspection; and obtaining patrol inspection results of a third-stage precision inspection based on the fine images.

The invention discloses a variable cross-section spillway tunnel flow measurement method, and belongs to the technical field of hydraulic engineering, and the method comprises the following steps: S1, constructing an experiment system, the experiment system comprises a reservoir, a stilling pool and a plurality of experiment pipelines arranged in parallel, and the inlet end and the outlet end of each experiment pipeline are respectively communicated with the reservoir and the stilling pool; s2, selecting a target experimental pipeline: determining the shape of a to-be-tested variable cross-section flood discharge tunnel, and selecting the corresponding target experimental pipeline, so that the inlet end and the outlet end of the target experimental pipeline are respectively communicated with the reservoir and the stilling pool; s3, running the experiment and measuring data: supplying water into the reservoir, and measuring the flow velocity, pressure and water level in the target experiment pipeline; and S4, switching and repeating experiments: when another form of variable cross-section spillway tunnel needs to be tested, closing the inlet end of the current target experiment pipeline, and repeating the steps S2 and S3. The device has the effects of conveniently and quickly realizing data determination of experimental pipelines in different forms and improving the experimental efficiency.

The invention discloses an ecological slope protection drainage method, and belongs to the technical field of ecological slope protection engineering. The slope body is provided with a water guide blind ditch and an inclined drainage hole channel, a double-wall corrugated drainage pipe is embedded in the hole channel, an outlet of the drainage pipe is communicated with the water guide blind ditch, and a stilling pool is arranged at the tail end of the blind ditch; a three-dimensional composite drainage net is laid on the slope surface, a vegetation matrix layer and a vegetation concrete layer are sequentially laid on the slope surface, and shrub seedlings are planted in the vegetation matrix layer and the vegetation concrete layer. The method can be used for deep drainage of slope surfaces and slope bodies in ecological slope protection engineering, the stability of the slope bodies is improved, and ecological vegetation is considered.

The invention discloses a deep digging type stilling pool structure for energy dissipation and desilting of a corrugated bottom plate and an energy dissipation and desilting method. The structure comprises a plurality of wavy bottom plates with triangular sections, and the wavy bottom plates are arranged at the bottom of the stilling pool in parallel at equal intervals; the tail sill is arranged at the tail end of the stilling pool; the stilling pool front groove is formed in the bottom end of the incoming flow slope surface, and a hole is formed in a downstream side slope of the stilling pool front groove to form a sand discharging channel; the desilting cavities are formed in the centers of wave troughs formed by the adjacent wavy bottom plates, and the desilting cavities communicate with the desilting channels; part of bottom high-flow-speed water enters the desilting channel through a groove in the front portion of the stilling pool, and upward jet flow is generated through an outlet in the tail portion of the desilting cavity. The stilling pool structure has the turbulent flow enhanced energy dissipation function and the self-driven desilting function, efficient energy dissipation and active desilting are synchronously achieved, and the comprehensive efficiency of flood discharge, energy dissipation and desilting of the water conservancy project and the long-term operation stability are remarkably improved.

This invention discloses a large-flow stilling basin structure, relating to the field of hydraulic engineering technology, including sidewalls, a base plate, and a sealing assembly. The sidewalls are arranged around the base plate; backfill material is placed between the sidewalls and the bedrock; longitudinal and transverse drainage channels are provided at the bottom of the base plate; drainage filler is placed within the longitudinal and transverse drainage channels; at least one induced joint is provided on the upper surface of the base plate, and a sealing assembly is installed on the induced joint. A drainage strip is provided below the base plate to reduce the constraint of the bedrock on the base plate and enhance foundation drainage, reducing buoyancy. The induced joint on the base plate can reduce the size of the base plate, reducing cracks caused by temperature stress due to an excessively large base plate; a central diaphragm is provided on the base plate to increase the rigidity of the base plate and prevent cracks; the sealing assembly seals the top of the induced joint, preventing water in the stilling basin from flowing through the induced joint between the base plate and the bedrock, further reducing buoyancy.

The invention relates to the technical field of safety monitoring and hydraulic calculation of water conservancy and hydropower engineering, in particular to a flood discharge dam section stilling pool average water level measuring and calculating method and system.The method comprises the steps that firstly, multi-source monitoring data of the opening degree of a radial gate, the dam front water level, the plant tail water level and the total flow of a warehouse-out station are collected, and quality control processing is conducted on the data; then, on the basis of the opening degree of the radial gate and the water level in front of the dam, the flood discharge flow and the total flood discharge flow of each gate orifice are calculated through a three-dimensional discharge curve; then, according to the difference value between the total flow of the warehouse-out station and the total flood discharge flow, the power generation tail water flow is calculated in combination with a water level-flow relation curve corresponding to the plant tail water level, and a dynamic flow balance model is established; and finally, generating a stilling pool water level initial value by adopting a non-constant flow empirical formula method, iteratively calculating the conjugate water depth through a hydraulic jump equation, and improving the calculation precision through an iteration method. According to the method, the problems of direct measurement difficulty in a torrential water flow environment and calculation errors in a non-constant flow condition are effectively solved.

The utility model provides a shaft spillway energy dissipation structure which comprises a stilling pool and a stilling beam, the head portion of the stilling pool is arranged below a shaft, the tail portion of the stilling pool is connected with a recession tunnel, the bottom of the stilling pool is flush with the bottom of the recession tunnel, the height of the stilling pool is larger than that of the recession tunnel, and the stilling beam is connected with the stilling pool. Water flows into the recession tunnel through the vertical shaft and the stilling pool in sequence, the stilling beam is arranged in the middle of the stilling pool, and the extending direction of the stilling beam is perpendicular to the main flow direction in the stilling pool. The flat-bottom stilling pool and the stilling beams are arranged at the bottom of an existing vertical shaft, a common cylindrical stilling well is replaced, the energy dissipation effect can be enhanced, the pulsating load of a bottom plate of the stilling pool and the fluctuation of the water surface in the pool are reduced, and the stilling structure has the advantages of being safe in structure, smooth in outflow and the like.

The utility model discloses a kind of flying wing toe piers, which is composed of gate pier, spillway, flying wing toe pier, stilling basin, side wall and tail sill;The gate pier is arranged at one end of the stilling basin, and the water flows through the spillway into the bottom of the stilling basin;The side wall is arranged on both sides of the stilling basin;The tail sill is arranged at the other end of the stilling basin;The flying wing toe pier is arranged at the tail end of the spillway, and the tail is flush with the end of the reverse curve section of the spillway, arranged at equal intervals.The flying wing toe pier is different from the traditional toe pier in that the height of the tail is different, and it can adapt to different flow conditions.The reduction of the bottom flow velocity and the improvement of the energy dissipation efficiency reduce the length of the stilling basin and the impact pressure of the bottom plate, thereby reducing the investment of the entire stilling basin.

The stilling pool is characterized in that a heightened tail sill is arranged on the downstream side of an original tail sill, the original tail sill is located on the downstream side of a dam and an apron, a tail sill top platform is arranged at the top of the heightened tail sill, and heightened side walls are arranged on the basis of original side walls on the outer sides of the two transverse river direction ends of the heightened tail sill respectively; the slope ratio and the transverse river width of the heightened tail sill are kept consistent with the slope ratio and the transverse river width of the original tail sill; the length of the platform on the top of the tail sill in the river direction meets the requirement for arranging the movable flood control baffle and is used for temporarily retaining water when the stilling pool is overhauled. An arc-shaped chamfer is arranged at the turning position of the tail end of the tail sill top platform. On the premise that construction quality is guaranteed, engineering investment is saved, the original energy dissipation effect is not affected, and a dry land environment is provided for maintenance of the stilling pool.

The utility model belongs to the technical field of hydraulic structure repairing equipment, and particularly relates to a gabion construction device for repairing apron scour pits of a stilling pool of a hydropower station, which comprises an overwater hoisting platform and a grating cage supporting steel frame, hoisting equipment and feeding equipment are mounted on the overwater hoisting platform, the hoisting equipment is connected with the grating cage supporting steel frame, and the feeding equipment is connected with the grating cage supporting steel frame. According to the utility model, the construction efficiency and quality of the underwater gabion gabion are improved, the shape of stone dumping and filling of the apron bottom plate of the riverbed stilling pool is controlled, and the continuous stone dumping and filling operation can be realized; and the improvement of the construction application efficiency of the gabion gabion, the improvement of the construction quality and the promotion of the riverbed scouring pit defect treatment technology are facilitated.

The low water head post-sluice underflow combined energy dissipater comprises a post-sluice stilling pool, a plurality of triangular piers are evenly arranged at the position, n meters away from the horizontal distance of a slope bottom, of a slope section of the front section of the post-sluice stilling pool at intervals, n = (Hpool-1.3 Htriangular pier) * k, Hpool is the designed pool depth of the post-sluice stilling pool, k is the designed pool depth of the post-sluice stilling pool, and k is the designed pool depth of the post-sluice stilling pool. H is the height of the triangular pier, and k is the gradient of the slope section; the vertical face, parallel to the water flow direction, of the triangular pier is triangular, the section, perpendicular to the water flow direction, of the triangular pier is rectangular, and the top of the triangular pier is provided with a lifting corner upwards lifted towards the middle side of the stilling pool behind the gate. The top elevation of the triangular pier is slightly lower than the top elevation of the tail sill, and the elevation difference between the top elevation of the triangular pier and the top elevation of the tail sill is 0.3 H of the triangular pier. Under various hydraulic conditions, especially under the downstream low water level condition, the energy dissipation and scour prevention effects are remarkable, and the device can well adapt to the large tidal range condition with large downstream water depth fluctuation.

A stilling basin end sill protection structure and a construction method, which belong to the technical field of hydraulic and hydropower engineering. The stilling basin end sill protection structure comprises: a stilling basin end sill formed by an original downstream cofferdam, a protection structure on the upstream of the downstream cofferdam, and a protection structure on the downstream of the downstream cofferdam, wherein the protection structure on the upstream of the downstream cofferdam comprises a ground beam arranged at the foot of a slope, multiple layers of gabions stacked on the inner side of the ground beam, a block-stone slope protection located on the back of the gabions, and a gabion protection built by using large block stones after the gabions are stacked at the top of the cofferdam. By means of the protection structure and the construction method, the demolition project volume of the original downstream cofferdam is reduced, and the concrete pouring project volume of the stilling basin end sill is reduced. By means of using the gabions, the block-stone slope protection and mortar-grouted masonry, the stability and impermeability of the protected stilling basin end sill are ensured. The present invention involves convenient and simple operation, and can achieve rapid construction on the premise of ensuring safety and quality. The construction cost is reduced, and the construction period is shortened.

This invention relates to the field of soil and water conservation technology, and provides a portable gully retainer and its deployment method for shallow gully management. The portable gully retainer includes a transverse retaining wall, a stilling basin, and protective wing walls. The transverse retaining wall is positioned horizontally along the width of the shallow gully and has an overflow outlet. The stilling basin is located downstream of the transverse retaining wall, with a gradient arrangement between the stilling basin and the overflow outlet. The protective wing walls are located at the end of the stilling basin furthest from the transverse retaining wall, and are angled to the flow direction of the shallow gully. The transverse retaining wall, stilling basin, and protective wing walls are connected to form a turbulent flow channel, which slows down the water flow velocity and controls the flow direction within the shallow gully. This invention effectively intercepts sediment, controls gully slope expansion and gully bottom erosion, is easy to assemble and disassemble, is reusable, and its deployment location and insertion depth can be dynamically adjusted according to the sediment deposition depth without affecting mechanized farming, fundamentally solving the problem of shallow gully management in black soil areas.

An asphalt concrete core wall dam body spillway comprises an overflow weir arranged at the top of a core wall dam, a base extending to a downstream slope toe along the top of the core wall dam, a discharge chute formed in the base and a stilling pool arranged at the tail end of the discharge chute. The discharge chute is divided into a plurality of second sub-bodies by a plurality of second transverse seams, the first sub-bodies and the second sub-bodies are mutually independent structures, the contact surfaces of the first sub-bodies and the second sub-bodies are step-shaped, and the first transverse seams formed by the adjacent first sub-bodies and the second transverse seams formed by the adjacent second sub-bodies are arranged in a staggered manner; the first split body is provided with a plurality of non-slip keys, the non-slip keys are embedded into non-slip key grooves in the bottom of the second split body, and compressible gaskets are arranged on the contact faces of the non-slip keys and the non-slip key grooves. And a certain movable gap is reserved on the downstream side of the non-slip key in the non-slip key groove. According to the method, engineering arrangement can be concentrated, adverse effects caused by sedimentation, vibration, leakage and the like between the dam body and the discharge chute are reduced, and the safety and stability of the dam are improved.

The application relates to the field of waterway engineering, in particular to a method for optimizing navigation flow conditions of a waterway branch stream confluence section. The method comprises the following steps: setting a corresponding physical model of the waterway branch stream confluence section, based on the physical model, carrying out engineering measures such as widening a branch stream mouth, setting left and right side slopes, setting a first step-type stilling basin, designing a stilling basin height difference and corresponding steps, testing whether a transverse flow rate exceeds a standard value under an adverse working condition, based on a test result, optimizing and modifying the physical model, through multiple sets of contrast tests, such as setting a solid separation dike, a sand trap, a 1:4 steep slope and the like, and selecting an optimal scheme as the optimization scheme of the navigation flow conditions of the waterway branch stream confluence section in comprehensive consideration of engineering technicality, economy, coordination between engineering measures and the environment and the like.

The utility model belongs to the technical field of water conservancy construction, and particularly discloses a landscape modeling barrage for fish migration, the barrage comprises a weir body, the top of the weir body is sequentially provided with a traffic stepping stone and multiple stages of water drop units along the water flow direction, and the first stage of water drop unit adjacent to the traffic stepping stone is provided with landscape green plants. A stilling pool is arranged on the downstream side of the final-stage hydraulic drop unit, and a sea curtain is arranged on the downstream side of the stilling pool; and an ecological channel for fish migration is arranged on the retaining wall on one side of the weir body along the water flow direction. The landscape modeling barrage capable of allowing the fishes to migrate has the remarkable advantages in the aspects of fish migration supporting, ecological connectivity improving, landscape and ecological function fusion, multi-function integration, safety, durability, economical efficiency, practicability and the like. And a new technical path and a new solution are provided for sustainable development of water conservancy projects.

The utility model relates to a dike-turning river-exiting pressure pipeline system based on a siphon principle, which comprises a forebay, a pump room, a river-exiting pressure pipe, a vacuum breaking valve, a stilling pool and the like, and the forebay and the pump room are arranged on the backwater side of a flood bank. The river-out pressure pipe is buried under the flood bank ground, the river-out pressure pipe forms an arch with the middle protruding upwards along with the flood bank, and a vacuum breaking valve is arranged at the highest position of the protruding. A siphon condition is formed by arranging the arch-shaped river-out pressure pipe, drainage energy consumption can be greatly saved, air in the pipe is conveniently discharged before drainage, vacuum negative pressure in the pipe is kept during drainage, the pipe is communicated with the atmosphere after drainage is completed by arranging the vacuum breaking valve, water flow backward flowing is avoided, and safety is guaranteed. The stilling pool is arranged on the drainage side of the flood bank and used for dissipating energy of drained water flow. The whole system is simple in structure, small in construction amount and convenient to overhaul.

The utility model relates to the technical field of abrupt expansion drop sill stilling pool abrasion damage model tests, and discloses a stilling pool abrasion medium auxiliary throwing device which comprises a lifting arm frame part and a throwing box part, an inclined bottom medium box is arranged on the lower end face of a connecting plate, and the connecting plate is connected with the telescopic end of the lifting arm frame part. An opening baffle is arranged on one side of the inclined-bottom medium box in an up-down moving mode, the lifting arm frame part is installed on the pool wall of the stilling pool, in the throwing process, an abrasion medium is put into the inclined-bottom medium box, the inclined-bottom medium box is driven by the telescopic end of the lifting arm frame part to move downwards to the pool bottom, and the lower end of the opening baffle makes contact with the pool bottom and is jacked upwards; the opening of the opening baffle is aligned with the opening in the lower end of the inclined bottom medium box, so that the abrasion medium in the inclined bottom medium box slides to the pool bottom along the inclined bottom, manual throwing is not needed, the throwing point is more accurate, it can be ensured that the abrasion medium is thrown in place, and the experiment accuracy is improved.

This invention discloses a method for analyzing the ultimate load of arch block instability in an inverted arch stilling basin. Using structural mechanics methods, a mechanical model of arch block instability is established, dividing the instability process into three stages: lifting of the middle arch block, sliding of the two side arch blocks, and warping of the two side arch blocks. Considering engineering safety and reasonable computational complexity, the model is simplified, and a simplified structural mechanics analysis method that facilitates manual calculation is proposed. This method can calculate the ultimate load of arch block instability corresponding to different anchoring forces in an inverted arch stilling basin, providing a reliable theoretical basis for the structural design of inverted arch stilling basins and possessing significant engineering application value.

This invention relates to the field of fish collection facilities technology, specifically to a fish collection system. It includes: a fish collection device and a sorting device. One fish collection device is installed on each side of the end section of the power generation tailrace channel, and the sorting device is located on a sorting layer above the fish collection devices. The fish collection device includes a fish inlet, a stilling basin, and a fish collection pool. The fish inlet is located at the outlet of the power generation tailrace channel. The stilling basin, fish collection pool, and fish inlet are arranged sequentially along the water flow direction from upstream to downstream. The stilling basin is connected to the fish collection pool and contains energy dissipation equipment. The fish collection pool is connected to the fish inlet and contains a fish collection box with a fish release outlet. The sorting device includes a lifting hoist and a sorting assembly. The lifting hoist is used to lift the fish collection box to the sorting layer, and the sorting assembly is located on the sorting layer and can connect with the fish release outlet. The fish collection system provided by this invention achieves fish collection on both sides of the power generation tailrace outlet, improving fish collection efficiency and reducing equipment costs.

The application discloses a kind of hedging type bottom flow energy dissipation structure, it includes stilling basin and water release pipe;The water inlet end of the stilling basin and the water release pipe is communicated with the water withdrawal structure of water release building respectively, the water outlet end of the water release pipe is arranged in the side wall of the still water area of the stilling basin, for the water outlet end water flow of the water release pipe and the still water area water flow of the stilling basin are collided.The above scheme can solve the current bottom flow energy dissipation structure in the case where engineering topographic condition is limited, the stilling basin cannot be widened, resulting in the problem that the flow velocity is too large and the energy dissipation effect is poor due to large single-width flow, and the problem that the later maintenance is complicated and difficult due to the increase of auxiliary energy dissipation.

The utility model relates to the technical field of hydraulic facilities, and discloses an ecological stilling pool which is characterized in that a left side wall or a right side wall or an original riverbed structure is arranged along a riverway, and a pool entering drop sill, a compound trapezoidal section stilling sill and a short weir tail sill are sequentially arranged between the left side wall and the right side wall or the original riverbed structure from upstream to downstream; a first-stage stilling pool is arranged between the pool entering drop sill and the compound trapezoidal section stilling sill, a second-stage stilling pool is arranged between the compound trapezoidal section stilling sill and the short weir tail sill, and bottom plates of the first-stage stilling pool and the second-stage stilling pool are natural riverbeds. According to the stilling pool, the three-stage structural bank is adopted, the two-stage stilling pool with the natural riverbed as the bottom is formed, the problems that damage of a stilling pool apron endangers safety and energy dissipation is insufficient are solved, the uncertainty evolution of a downstream river channel is improved and adapted, the engineering amount is small, construction is easy and economical, and the energy dissipation effect of a riverbed covering layer is fully utilized; and the problem of ecological migration of fishes caused by undercutting of the river channel can be solved by combining the arrangement of the existing fishway or fish guide channel.