72 results about "Stilling basin" patented technology

The invention relates to high head, large unit width flood energy dissipation by hydraulic jump technique, in particular to a high-low bucket energy dissipation pool of hydraulic jump, wherein the invention adopts a proper contraction angle in the plane of the high bucket, and outside wall of the high bucket does not contract, after the flood of high bucket contracts, the distribution in the vertical section of flooding is changed, when the downstream water level is high, part of the flood entering the pool is properly raised to reduce flooding degree and to fully exert the characteristics of submerged jets, thereby lengthening the distance between the flood to the pool bottom plate, weakening surface periodic wave, improving effects, reducing tail bucket water surface fluctuating, and avoiding vertical-axis eddy at the backward-facing step boundary wall.

The invention discloses a deformed inverse step rectifying energy dissipation method and a stilling basin. A continuous inverse step tail on a bottom plate is adopted instead of the conventional tail body type, and water current is collided with inverse steps hierarchically, so that energy is dissipated hierarchically, water current collision, doping and a fluctuation flow state before drainage are enhanced, and collision energy dissipation is realized; a vertical drop is arranged at a front-end inlet; side walls on both sides are asymmetrically diffused towards a river heart side curved surface, and the edges of each step are arranged in a continuous L or saw-tooth form, thereby forming transverse and longitudinal three-dimensional deformed inverse step structures being lower at the inlets, higher at the outlets, lower on the river heart sides and higher on the near-bank sides, so that a hydraulic jump energy dissipation flow state is formed forcibly in the basin. Meanwhile, water current is fully diffused transversely and is guided towards the river heart side, so that the basis length can be shortened effectively, the energy dissipation rate is increased, the effects of dissipating energy and adjusting the flow speed distribution are achieve, water current discharged out of the basin returns into a groove smoothly, and downstream erosion is relieved. The deformed inverse step rectifying energy dissipation method and the stilling basin are suitable for a water flow state with low water head, large unit width flux (particularly greater than m<2> / s) and low Fr number (particularly Fr number is smaller than 2).

The invention discloses a processing method of water-retention ready-to-eat natural rhopilema esculentum, wherein the processing method comprises the following working procedures: salting rhopilema esculentum and cutting into shreds; blanching for 20-30 seconds at 60-70 DEG C; rinsing for 3-8 minutes by use of running water; rinsing for 20-40 minutes by use of running water; rinsing by four stilling basins successively, and rinsing for 20-40 minutes for each basin; immersing by use of an immersing liquid containing calcium chloride and treholose; immersing by use of an immersing liquid containing potassium sorbite and acetic acid; and leaching water and carrying out vacuum packaging, thereby obtaining the water retention ready-to-eat natural rhopilema esculentum. The water retention ready-to-eat natural rhopilema esculentum prepared by the processing of the technology has reduced salt and vitriol content, is crisp in mouthfeel, is long in quality guarantee period, moreover is low in production cost, and is short in production time.

The invention discloses a hydraulic design method for a turned-slope type hydraulic jump stilling basin. The hydraulic design method comprises the following steps: the first step: calculating the flowenergy ratio K according to the lockage unit discharge q at the weir crest and the water head delta zeta of upstream and downstream of the weir; the second step: when the numeric area of K ranges from 0.5 to 3.0, respectively calculating the horizontal distance Lc of a weir nappe from the tail end of an inverse arc to the cross section before jump, the height difference Zc from a base plate of the basin to the water surface before jump, the Froude number Fr1 of the jump head cross section, the Froude number Frc at the tail end of the inverse arc and the energy dissipation ratio eta of turned-slope type hydraulic jump by using formulas; and the third step: designing the turned-slope type hydraulic jump stilling basin according to all the data calculated in the second step. The hydraulic design method is simple and convenient in calculation and fairly conforms to the actual engineering design; and as for the turned-slope type hydraulic jump stilling basin designed by using the hydraulicdesign method, an auxiliary energy dissipator is not required, and the turned-slope type hydraulic jump stilling basin is simple in contour arrangement, is easy for engineering construction and is slight in downstream scouring.

The purpose of the present invention is to obtain efficiency of dissipation or loss of the excess kinetic energy, at each required spillway of the even at relatively low approach of energy heads and relatively high discharges, which means at very low Froude numbers and by negligible decrease of the interior transversal cross-section of each required spillway by the designing of new hydraulic structures or even only on the basis of economically acceptable reparation each required of the already existing structures, the effective dissipation and / or loss of excess kinetic energy and thus prevent the bottom and banks of each required river channel downstream from the spillway against extensive erosion. The spillway consists of the consolidated stilling basin (2) positioned directly below / behind the spillway (1) and if / when required it is concluded with the end sill (3) and at the sides constrained with vertical or inclined side walls (4′, 4″). If required, in the area of such spillway there is an appropriate gate (6) or end sill (3) together with the side walls (4′, 4″), which represents a uniform, compact structure available to withdraw the hydraulic loadings and other phenomena, which occur between the impounding reservoir area of each stream flow arranged upstream / before the spillway and the tailwater river channel with the river banks below / behind the spillway area. According to the invention there, in the area at least one of the side walls (4′, 4″) of the spillway, at least one dissipation beam (5′, 5″) is foreseen, which extends at least essentially in the flow direction and protrudes from the side into the interior of the spillway.

A novel body type overflow dam and an underflow energy dissipation method belong to the technical field of hydraulic engineering dam engineering design and relate to engineering design for medium and low water head overflow dams using underflow energy dissipation. Its characteristic is that the anti-arc section of the traditional overflow dam is cut off, and the water flow on the weir surface directly enters the stilling basin from the straight section, which shortens the length of the traditional stilling basin and raises the floor elevation of the stilling basin. The stilling pool is divided into two stages, which are stepped, and the water flow on the weir surface enters the groove of the stilling pool from the straight line. The effect and benefit of the present invention are: under the premise that the new body type overflow dam meets the design requirements and ensures the same discharge capacity as the conventional body type overflow dam, the section shape of the dam body is reduced, and the dam body concrete in the project is reduced. The consumption improves the energy dissipator downstream of the overflow dam, which can reduce about 50% of the energy dissipator engineering quantity and save 20-30% of the bottom flow energy dissipator investment.

The invention relates to a facility for eliminating the negative pressure of a bottom plate at a torrent diffusion slope-variable section of a flood discharging tunnel, The facility comprises a step-down floor and pressing holes, wherein the step-down floor is arranged in front of a negative pressure region of the bottom plate at a diffusion section of the flood discharging tunnel; the pressing holes are arranged at two ends of the step-down floor outside a side wall of the flood discharging tunnel; a hollow cavity formed between a jet flow surface generated by discharged water in the flood discharging tunnel flowing across the step-down floor and a step-down floor bottom plate surface is communicated with air through the pressing holes so that the negative pressure of the bottom plate of the flood discharging tunnel is reduced and partial damage of the bottom plate of the flood discharging tunnel is avoided. In general, the step-down floor height is 0.30-1.00m, and the sizes of the pressing holes are determined by factors, such as the step-down floor height, step-down floor aerating capacities, a negative pressure region range and the like. A physical model test result shows that the pressing facility provided by the invention can be used for effectively eliminating a negative pressure value of the bottom plate at the torrent diffusion section of the flood discharging tunnel, increasing water flow aerating concentration and improving the energy dissipation effect of a stilling basin.

The invention relates to an energy dissipation structure capable of adjusting the tail sill height of a stilling basin and an adjusting method thereof. The energy dissipation structure comprises a step overflow dam, a WES ogee section and the stilling basin, wherein the step overflow dam, the WES ogee section and the stilling basin are sequentially connected; a stilling basin tail sill is arrangedat the tail end of the stilling basin; a hydraulic lift-up device is arranged at the bottom of the stilling basin tail sill; and the height of the stilling basin tail sill can be adjusted through thehydraulic lift-up device. Through optimizing the integral stilling basin tail sill, different heights of the stilling basin tail sill can be adopted under different flow rate conditions, so that theintegral stability of the bottom plate of the stilling basin and the turbulence degree of the water flow regime are buffered to different degrees, the bottom stability of the stilling basin and stability of bank slopes on both banks are protected favorably, and the energy dissipation rates under various levels of flow rates are increased to different degrees.

The invention discloses an irrigation and drainage system which comprises a water source project and an irrigation and drainage project. The water source project comprises a reservoir and a pump station for supplying water to the reservoir, the reservoir comprises a retaining dam, a spillway, and a water bypass, the water inlet end of the spillway is communicated with the reservoir, the water outlet end of the spillway is provided with a stilling basin, the stilling basin is located at the bottom of the retaining dam, the water discharge duct is located at the lower part of the retaining dam,the water inlet end of the water discharge duct is communicated with the reservoir, and the water outlet end of the water discharge duct is communicated with the stilling basin after passing through the retaining dam; the irrigation and drainage project comprises a water conveyance channel, wherein the water conveyance channel comprises a main canal and a branch canal for irrigation and drainage;the water inlet of the main canal is communicated with a stilling basin; the water inlet of the branch canal is communicated with the main canal; and the branch canal is connected with a point to be irrigated. The invention has the advantages of reasonable design, long service life and high comprehensive economic benefit of flood control irrigation. The invention is applied to the technical fieldof water conservancy construction.

The invention discloses a hedging type flood discharging and energy dissipation structure and method. The hedging type flood discharging and energy dissipation structure comprises a stilling basin, atunnel is arranged on the periphery of the stilling basin, one end of the tunnel communicates with a reservoir, and the other end of the tunnel correspondingly communicates with two opposite inner side walls of the stilling basin through branched pipes. By adopting the technical scheme of the hedging type flood discharging and energy dissipation structure, during the flood discharging of the reservoir, a valve A and a valve B are opened, so that water flow in the reservoir flows into the stilling basin sequentially through the tunnel, the branched pipes and the two opposite inner side walls ofthe stilling basin, the water flow mutually hedges and collides a flood discharging water tongue in the stilling basin, energy of the flood discharging water tongue and own jet flow is dissipated inthe collision process, and then the water flow falls to the bottom of the stilling basin. A water cushion is arranged at the bottom of the stilling basin to eliminate the rest energy in the water flow, so that the energy in the water flow is sufficiently dissipated, the washing of an underwater bed, a bank slope and other buildings is reduced, the energy dissipation efficiency is improved, the safety of the downstream buildings is ensured, and the washing action force of the water cushion is reduced.

The invention relates to a high- and low-sill stilling basin with a function of on-way dispersive energy dissipation. The high- and low-sill stilling basin comprises a flow inlet segment, a stilling basin connected with the flow inlet segment, stilling basin inner partitions, a stilling basin end sill and an apron connected with the stilling basin, wherein the stilling basin inner partitions connected with the inlet segment locate at the front end of the stilling basin. The partitions are distributed at intervals at the position of the high- and low-sill stilling basin, connected with low-sill discharge holes. The bottom of each partition locates on the bed of the stilling basin. The two sides and upstream rectangular side of each partition are all perpendicular to the bed of the stilling basin, and from the top of an outlet of the low-sill discharge hole of the flow inlet segment, the partitions are smoothly connected with a low sill through arc transitional segments. The high- and low-sill stilling basin has the advantages that the impact of discharge flow upon the front of the stilling basin can be dissipated and homogenized, the central energy-dissipating area in the front half of the high- and low-sill stilling basin is dispersed, the on-way dispersive energy dissipation is achieved, the problems of turbulent and violent flows and high surface fluctuation in the central energy-dissipating area are avoided, horizontal axial vortexes are effectively cut off, and damage of the horizontal axial vortexes is further weakened.

The invention discloses a comprehensive arrangement of combining a tunnel-type nature-like fishway with a fish lock and an application method thereof. Downstream beds and upstream reservoir water areas are connected through a fishway main body and the fish lock; the fishway main body is arranged in mountains beside powerhouses and comprises side walls, a bottom board and a top arch; a plurality of contraction sections are arranged in the fishway main body to separate the fishway main body into a plurality of fishway pond chambers; and the fish lock is sequentially provided with a fish lock downstream working gate, a movable fish driving device, a stilling basin, a fish lock upstream working gate and a stoplog gate from the downstream side. The comprehensive arrangement disclosed by the invention can be adapted to large and rapid changes of upstream water levels of reservoirs and narrow landforms of beds and has the advantages that fishes are guided to pass according to the different upstream water levels; appropriate water temperature, flow and flow velocity are provided for fish migration; the natural aquatic environments of rivers can be simulated; the excavation volume and the engineering design and the construction difficulties are reduced; and the construction cost is reduced while the fish passing effect is guaranteed at the same time.

The invention discloses a numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling basin, which comprises the following steps: firstly, building design data such as an outlet section of the flood diversion tunnel, the stilling basin, an apron and a riprap are collected; a two-dimensional mathematical model of a stilling pool and a downstream local river channel is established by utilizing mike21 software according to collected relevant design data of the outlet section of the flood diversion tunnel, the stilling basin, the apron, the riprap, a downstream river channel and the like, a model grid type adopts an unstructured grid, and the grid size is subjected to regional encryption processing according to the stilling basin body type. The stilling basin two-dimensional mathematical model established by mike21 software is used for simulating and calculating the energy dissipation effects of stilling basins in different body types, the method is simple in modeling and high in calculation speed, the defects that time and labor are wasted in modeling and modification of a traditional physical model test, and the data measurement accuracy is influenced by manual operation and a measuring instrument are overcome, the working efficiency of the model test is improved, the working cost is reduced, and the result can provide a scientific basis for the optimization design of the stilling basin.

The invention discloses a rectification energy dissipation method for an inverse step stilling basin and the stilling basin. A conventional end sill shape is replaced with a continuous inverse step end sill at the tail end, so that water flow collides with the end sill in a layering manner, the phenomenon of surge caused by straight wall type or steep slope type end sill collision and more concentrated water flow impact force in the basin are avoided, the flow regime of collision, mixing and turbulence of the water flow which is not discharged from the basin can be enhanced, and by collision energy dissipation and increasing of conjugate water depth of water jump, the length of the basin can be effectively decreased, energy dissipation rate can be increased, and energy dissipation and speed regulation functions can be realized. The rectification energy dissipation method and the stilling basin are applied to the conditions of high and medium water heads, high Fr coefficient, connection of the stilling basin to the downstream, uniform inflow and outflow and coaxiality between the axis of a river channel after an outlet and the water flow discharged from the basin.

The invention discloses a continuously adjustable stilling basin. The continuously adjustable stilling basin comprises a basin body, wherein side walls are arranged on two sides of the basin body and the water inlet is formed in one end of the basin body and a water outlet is formed in the other end of the basin body, and a steep slope section of which the slope can be adjusted, an apron of which the height and length can be adjusted and a riprap of which the length can be adjusted are in sequence arranged in the basin body along the water flow direction. The adjustable underflow stilling basin disclosed by the invention has simple principles, convenience in adjustment and capability of quickly and accurately finding the optimum size of the stilling basin, thereby being capable of saving the occupied time for modifying a model while a model test is carried out, and the adjustable underflow stilling basin is further applied to the model test of hydraulic structures, especially suitable for solving the problem of underflow energy dissipation to provide preconditions for shortening the design cycle of a water conservancy project.

The invention discloses a stilling basin system, which comprises a stilling basin and is characterized in that the water inlet end of the stilling basin is downwards recessed to from a buffer stilling groove; the height of the bottom surface of the stilling basin positioned in front of the buffer stilling groove is greater than the height of the bottom surface of the buffer stilling groove; flow division plates are upwards arranged on the bottom surface of the stilling basin positioned in front of the buffer stilling groove at intervals; the back end of each flow division plate is connected with the upper side of the front end of the buffer stilling groove; the whole of the flow division plate is in a horizontal state; a gap through which bottom layer water flow passes is formed between the flow division plate and the bottom surface of the buffer stilling groove arranged in front of the buffer stilling groove; and a flow guide structure used for guiding the bottom layer water flow of the flow division plate to upwards move and to realize the collision merging with the upper layer water flow of the flow division plate is formed at the back part of the flow division plate. The stilling basin system has the advantages that the energy carried by the water flow per se is ingeniously used for energy dissipation; and the advantages of implementation convenience, low cost, high energy dissipation efficiency, long service life and the like are realized.

The present invention relates to a swimming device for testing a lure (12) used in rod-fishing. This type of a device comprises two substantially parallel pipe-like means (1, 2) and arranged in a substantially horizontal position. The pipe-like means are preferably connected to each other by connection means (3, 4) arranged at both ends of the pipes, and there are stilling basins (9, 10) immediately next to the connection means. Further, a control means (6) maintaining the flow of the fluid (5) led in to the swimming device is arranged into one of the pipe-like means. In the operating position of the device, the upper pipe-like means, i.e. testing pipe, has a lure tower (13) connected to the pipe and protruding from it, and the lure (12) can be lowered into the swimming device for testing it in the fluid flow caused in the testing pipe.

The invention discloses an anti-cavitation installation for the tails of flaring gate piers of a stepped spillway. The anti-cavitation installation adopts sluice chambers which combine sluice piers with the flaring gate piers and which are provided with inlets larger than outlets, and can increase the compression capacity on water flows by virtue of the flaring gate piers to horizontally contractand vertically stretch the discharged water flows for downstream ski jumping so that streams of ski-jump water jets aerate and collide with each other in the air, thereby improving the energy dissipation effect of the flaring gate piers. A flip bucket at the tails of the flaring gate piers can deflect water flowing out of the sluice chambers from a spillway surface so that the posterior spillway surface forms a waterless area. The shape of novel transition steps with aeration tanks is utilized to change the area size and shape of an aeration cavity, and ventilation holes and ventilation shaftsare also used for aeration to increase the aeration amount at the spillway surface so as to enable the spillway surface which is most prone to be damaged by cavitation erosion and cavitation to perform reasonable aeration and reduce the possibility of damage. Steps behind the cavity are exactly the falling points of the front edges of the water jets, and the friction resistance effect of the steps on the water flows is utilized to accelerate the dissipation of the flow discharge energy by the steps; and then a reversed arc section and a stilling basin are utilized to further dissipate the energy.

The invention relates to a form-variable stilling basin front end energy dissipation structure and an energy dissipation method thereof. The form-variable stilling basin front end energy dissipation structure is mainly composed of a WES overflow weir and a stilling basin, wherein the WES overflow weir comprises a curve section of the WES overflow weir, a linear section of the WES overflow weir andan inverted arc section of the WES overflow weir; the stilling basin comprises a stilling basin front end, a stilling basin rear end and other parts. Innovation is conducted mainly aiming to high intensity of pressure of the stilling basin front end, the stilling basin front end is divided into blocks with same size, and accessory hydraulic jacking devices are arranged on the stilling basin bottom plate blocks obtained through dividing respectively; the relative height between each stilling basin bottom plate block and the inverted arc section of the WES overflow weir is adjusted through accessory hydraulic control valves; in order to bring convenience to actual management of engineering, a main hydraulic control valve is installed, and the whole device can be adjusted.

The invention discloses an auxiliary transfer pump station of drainage tunnel in subway crossing. The auxiliary transfer pump station of drainage tunnel in subway crossing includes an upstream drain, an upstream flume, a diversion partition, a rack, a regulating gate, a stilling basin, a partition hole, a collecting basin, a wet-pit pump, a maintenance platform, an overflow tank, a downstream drain, a pressure drain pump, a pump interlayer, a sewage pump floor, an equipment transport channel, a pump lifting hole, a control board, a control cabinet, a manhole, a hole for hoist and a pump room. The auxiliary transfer pump station of drainage tunnel in subway crossing aims at features of an outlet tunnel in subway crossing, which are that displacement is larger, interval is long and embedded depth is deep. The auxiliary transfer pump makes combination of a drainage pumping station and a transfer pumping station come true. The auxiliary transfer pump station of drainage tunnel in subway crossing has many advantages, for example, water pump can be stopped when maintenance is needed, degree of automation is high, civil investment and construction difficulty can be diminished and safety and reliability of operating drainage can be improved.

The invention discloses an underflow energy dissipater with a pressurized pipeline used for outflow. The underflow energy dissipater is composed of the pressurized pipeline 1 and a stilling basin 5. The front half segment of the pressurized pipeline 1 is located on the upstream outside the stilling basin 5 and provided with at least two pressurized turning segments 2, a vertical segment 9 is arranged between the first pressurized turning segment and the second pressurized turning segment, and the rear half segment of the pressurized pipeline 1 is located at the bottom of the stilling basin and communicated with the stilling basin 5 through at least two water outlets formed in the pipe wall. Through the underflow energy dissipater, not only can an energy dissipation area be arranged in the stilling basin through the water outlets evenly distributed on the pressurized pipeline, but also energy dissipation can be performed along the course through the pressurized turning segments designed on the pressurized pipeline, and therefore concentrated energy dissipation in the prior art is changed into dispersed energy dissipation, the energy dissipation effect is improved, the energy dissipation function of the stilling basin is fully played, the building scale of the stilling basin is reduced, investment is reduced, and the underflow energy dissipater is flexible in application and capable of adapting to different flows and waterheads.

The invention discloses a roller energy dissipation device. The roller energy dissipation device comprises a roller supporting frame, a roller and a steel shaft. The roller support frame is arranged on the foundation of the sea flood section, the steel shaft is arranged in the roller supporting frame, and the roller is arranged on the steel shaft to rotate along with the steel shaft. The roller energy dissipation device is arranged behind a stilling basin and is simple in structure, easy to operate and low in manufacturing cost. The roller energy dissipation device can effectively solve the scouring effect of the high-speed water flow on the downstream riverbed of a low-head hydraulic structures (sluices) for retaining water and discharging water in the discharging process, further protectthe riverbed, the riverbank and improve the water flow condition, and save the cost for reinforcing and repairing the riverbank.

The invention relates to the field of prevention and control of gully head erosion, and provides a gully head protection structure for developing an erosion gully and a construction method thereof. The gully head protection structure for developing the erosion gully comprises a grit chamber, a slow flow tank, a draft tube, a stilling basin and a fixing screen which are arranged in sequence and arein communication in sequence along the water flow direction, wherein the grit chamber and the slow flow tank are arranged on the surface outside a gully head; the stilling basin and the fixing screenare arranged at the gully bottom in the gully head; one end of the draft tube is in communication with the slow flow tank; the other end of the draft tube is in communication with the stilling basin;and the two sides outside the grit chamber are provided with interception gullies for introducing runoff water into the grit chamber respectively. Through the adoption of the gully head protection structure, the problems of single prevention measure, relatively high treatment cost, high land disturbance, great occupation and relatively weak rain flood resistance in an existing treatment method are solved.

The invention discloses a graded flow configuration energy dissipation method for deflecting water streams. The method comprises the step that the water streams deflected by a plurality of outlet structures are graded in the longitudinal direction of a stilling basin and are arranged with the flow increasing grade by grade, wherein the distance of the water streams between the grades is at least 20 meters under the premise that Li-H cot (ai) +H cot (ai+1) is satisfied, the flows of all deflected water streams in the same grade in the transverse direction are equal, and the distance Li(j) between every two defected water streams is at least 20 meters. According to the method, the water streams with smaller flows can sequentially and firstly enter the stilling basin and move at the bottom and the secondary bottom of the stilling basin; on one hand, the water streams will not cause impact damage and abrasion damage to the bottom of the stilling basin, and on the other hand, a better overall energy dissipation effect can be achieved between the water streams and between the water streams and turbulence areas which are sequentially produced by the water streams and a part of existing water body at the bottom of the stilling basin; meanwhile, impact damage and abrasion damage to the stilling basin by the subsequent water streams with larger flows can be greatly relieved, and therefore the safe operation of hydraulic engineering is guaranteed.

The invention discloses a suspended underflow type gradient stilling basin energy dissipation system. The system comprises multiple levels of stilling basins, an upstream diversion canal, flood overflow roads and a bank diversion canal, wherein the multiple levels of stilling basins are arranged at different altitudes on a mountain body on the side surface of a reservoir dam body; the upstream diversion canal is used for guiding water in a reservoir out; the flood overflow roads correspond to the multiple levels of stilling basins; the bank diversion canal is used for guiding the water in the stilling basin at the lowest altitude into a riverway; the downstream ends of adjacent two levels of stilling basins are opposite in directions; overflow weirs are arranged on the side walls at the downstream ends of the multiple levels of stilling basins. The suspended underflow type gradient stilling basin energy dissipation system provided by the invention can be applied to a narrow river valley and a low-flow rate high-water head hydraulic engineering with a gradually narrowed downstream riverway, the energy dissipation efficiency can be improved, the safety and the economy of a project are improved, and the difficulty degree of center arrangement is reduced.

The invention relates to a water conservancy facility, and specifically relates to a partial plunge pool type stilling basin. The partial plunge pool type stilling basin sequentially comprises a drop sill, a front shallow-water cushion, a plunge pool, a rear shallow-water cushion, an end sill and a downstream apron, wherein the front shallow-water cushion is connected to the bottom part of the drop sill; the sunken plunge pool is arranged at the rear side of the front shallow-water cushion; the uplifted rear shallow-water cushion is arranged at the rear side of the plunge pool; the end sill is arranged at the rear side of the rear shallow-water cushion. According to the partial plunge pool type stilling basin, the front shallow-water cushion and the rear shallow-water cushion of the stilling basin can perform the buffering function of a water cushion of the general stilling basin when the downstream water is at high level; the plunge pool in the middle can form a deep water cushion for the discharged water. Therefore, the water swirly rolls in the plunge pool and cannot indirectly impact a bottom plate of the stilling basin, and the speed of the water running close to the bottom can be effectively reduced; the rest energy can be dissipated again when the water runs through the end sill in the downstream, so that the bottom plate of the stilling basin can be certainly protected while good energy dissipating effect is ensured; the partial plunge pool type stilling basin is high in adaptability to the discharged flow.

The invention relates to a high- and low-sill stilling basin with a function of on-way dispersive energy dissipation. The high- and low-sill stilling basin comprises a flow inlet segment, a stilling basin connected with the flow inlet segment, stilling basin inner partitions, a stilling basin end sill and an apron connected with the stilling basin, wherein the stilling basin inner partitions connected with the inlet segment locate at the front end of the stilling basin. The partitions are distributed at intervals at the position of the high- and low-sill stilling basin, connected with low-sill discharge holes. The bottom of each partition locates on the bed of the stilling basin. The two sides and upstream rectangular side of each partition are all perpendicular to the bed of the stilling basin, and from the top of an outlet of the low-sill discharge hole of the flow inlet segment, the partitions are smoothly connected with a low sill through arc transitional segments. The high- and low-sill stilling basin has the advantages that the impact of discharge flow upon the front of the stilling basin can be dissipated and homogenized, the central energy-dissipating area in the front half of the high- and low-sill stilling basin is dispersed, the on-way dispersive energy dissipation is achieved, the problems of turbulent and violent flows and high surface fluctuation in the central energy-dissipating area are avoided, horizontal axial vortexes are effectively cut off, and damage of the horizontal axial vortexes is further weakened.

The invention discloses a self-air-entraining ternary hydraulic jump stilling basin. The stilling basin is provided with reverse-arc fillets and a reverse-arc step-down floor on a junction of a discharge chute and the stilling basin; two sides of a head side wall of the stilling basin are independently provided with an aeration shaft; the middle of the stilling basin is provided with a flow splitting pier and a middle partition wall; the middle part and the tail parts of the side wall and the middle partition wall of the stilling basin are independently provided with a lateral fillet; the middle and the tail of the bottom plate of the stilling basin are independently provided with a stilling ridge; therefore, binary hydraulic jump of a conventional stilling basin is transformed into ternary hydraulic jump, a strong friction and mixing function of a water body in the hydraulic jump can be enhanced, the energy dissipation power of the stilling basin is improved, the length and the depthof the conventional stilling basin can be reduced, the engineering quantity of the stilling basin is lowered, and engineering investment is lowered. Due to the arrangement of the shaft, the bottom ofthe stilling basin can be subjected to self air entraining, under a turbulent fluctuation function of a high-speed water flow, a great quantity of air is forced to be mixed into the water flow so as to form a gas and water two-phase mixing phenomenon, the air-entraining concentration of the water body is guaranteed, the bottom plate and the side wall of the stilling basin are protected from cavitation destruction, and the safety of a structure is guaranteed.