Urban river flow measuring device and measuring method

Abstract

The invention provides an urban river flow measuring device and method, the urban river flow measuring device comprises a fixed bottom plate and a shell cylinder arranged on the fixed bottom plate, a plurality of water inlet door openings are formed in the bottom end of the shell cylinder, and a water depth sensor is arranged in the bottom end of the shell cylinder; m vibration grooves are formed in the side wall of the shell barrel at intervals in the axial direction of the shell barrel, each vibration groove is communicated with the interior of the shell barrel, a vibration film is arranged at the position, close to an opening in the shell barrel, of each vibration groove, and vibration processors are arranged at the positions, corresponding to the vibration films, in the shell barrel; each vibration processor is connected with each vibration film in a one-to-one correspondence manner; a transmission antenna is further arranged at the top of the shell cylinder, and the water depth sensor and each vibration processor are connected with the transmission antenna; and the transmission antenna is in communication connection with an information processing system. The measuring device can effectively measure the flow of the shallow-water-level river in the urban river channel, and is simple in structure, convenient to install and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of urban river flow monitoring, and in particular to an urban river flow measurement device and a measurement method. Background Art

[0002] There is a lack of hydrological and hydrodynamic data on small urban rivers, and a lack of data on urban floods and waterlogging records. In order to further understand the flood flow patterns of cities under different rainfall and urban waterlogging control conditions, it is necessary to monitor the flow rate and water depth of river water bodies during the water conservancy monitoring process to obtain the flow changes of water bodies.

[0003] Due to the shallow water level in urban rapids, medium and large water conservancy monitoring stations cannot meet the monitoring environment of shallow water depth in small urban watersheds. The existing undercover ultrasonic flowmeter has blind spot problems, and the pole ultrasonic flowmeter can only monitor the shore water surface and is easily affected by wind-driven currents. Visual water gauge monitoring is limited to water level and river surface flow measurement and is also affected by wind-driven currents. Various types of traditional monitoring methods cannot meet the monitoring needs of urban rivers. Therefore, a flow measurement device is needed to effectively support the flow measurement work in such specific scenarios. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an urban river flow measurement device and a measurement method for solving the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present invention provides an urban river flow measuring device, comprising a fixed bottom plate, which is used to be fixedly set at the bottom of the river; an outer shell cylinder, which is fixedly set on the fixed bottom plate, and the bottom end of the outer shell cylinder is provided with a plurality of water inlet door holes, and the plurality of water inlet door holes are evenly spaced along the circumferential direction of the outer shell cylinder, and a water depth sensor is provided inside the bottom end of the outer shell cylinder; m vibration grooves are spaced on the side wall of the outer shell cylinder along the axial direction of the outer shell cylinder, wherein the distance from the first vibration groove to the fixed bottom plate is L1, the distance from the second vibration groove to the first vibration groove is L2, the distance from the third vibration groove to the second vibration groove is L3, ... the distance from the mth vibration groove to the m-1th vibration groove is L m; Each of the vibration grooves is communicated with the interior of the outer shell cylinder, and a vibration film is provided at the opening of each vibration groove close to the interior of the outer shell cylinder, and the vibration film is used to detect the vibration of river water, and a vibration processor is provided at a position corresponding to each of the vibration films inside the outer shell cylinder, and each of the vibration processors is connected one-to-one with each of the vibration films, and the vibration sensor obtains the vibration frequency of the vibration film based on the vibration information fed back by the vibration film; a transmission antenna, the transmission antenna is arranged on the top of the outer shell cylinder, and the water depth sensor and each of the vibration processors are connected to the transmission antenna; an information processing system, and the transmission antenna is communicatively connected to the information processing system.

[0006] Preferably, the outer shell cylinder includes a base cylinder and a main cylinder connected to the base cylinder, and an elastic vibration damping part is provided between the base cylinder and the main cylinder; the base cylinder is fixedly arranged on the fixed bottom plate, a plurality of water inlet door holes are arranged on the base cylinder, the water depth sensor is arranged inside the base cylinder, and m vibration grooves are arranged on the main cylinder.

[0007] Preferably, the main cylinder is connected to the base cylinder through a connecting head, the connecting head includes an upper screw and a lower screw, and a rubber flange is provided in the middle of the connecting head, the upper screw is threadedly connected to the inner wall of the main cylinder, the lower screw is threadedly connected to the inner wall of the base cylinder, and the rubber flange is clamped between the base cylinder and the main cylinder to form the elastic vibration damping member.

[0008] Preferably, a plurality of fixed platforms are provided inside the outer shell cylinder along the axial direction of the outer shell cylinder, and the vibration processor is arranged on the fixed platforms.

[0009] Preferably, an elastic vibration-damping pad is provided between the vibration sensor and the fixed platform.

[0010] Preferably, the vibration film is a piezoelectric ceramic sheet.

[0011] Preferably, a sealing plate is provided inside the outer shell cylinder, and the height of the sealing plate is lower than the height of the first vibration groove.

[0012] Preferably, a waterproof cap is provided on the top of the outer shell cylinder.

[0013] Preferably, a set gap is provided between the water depth sensor and the fixed bottom plate.

[0014] A second aspect of the present invention provides a method for measuring the flow rate of an urban river using the urban river flow measurement device described above, and the method for measuring the flow rate of an urban river specifically comprises the following steps:

[0015] S1. Obtain the water depth H of the river in the river channel through a water depth sensor, and transmit the detected water depth H of the river to the information processing system;

[0016] S2. The information processing system configures a corresponding water depth range for each vibrating tank according to the water depth H of the river;

[0017] S201. When H < L1 + 0.1L2, that is, the water flow does not completely submerge the first vibrating tank, or the water flow submerges the first vibrating tank but the submergence depth is insufficient, the water surface waves will interfere with the vibrating tank. At this time, the water level is too low, and the flow measurement device does not perform measurement;

[0018] S202. When L1 + 0.1L2 < H < L1 + L2 + 0.1L3, the water flow submerges the first vibrating tank and the second vibrating tank, but the submergence depth of the second vibrating tank is insufficient. The second vibrating tank is the same as the situation in step S201 above and is not considered. Then the water depth range h1 corresponding to the first vibrating tank = H, and the water depth ranges corresponding to the subsequent vibrating tanks are h i = 0, i > 1;

[0019] S203. When L1 + L2 + 0.1L3 < H < L1 + L2 + L3 + 0.1L4, the water flow submerges the first vibrating tank, the second vibrating tank and the third vibrating tank, but the submergence depth of the third vibrating tank is insufficient. The third vibrating tank is the same as the situation in step S201 above and is not considered. Then the first vibrating tank and the second vibrating tank are in a completely submerged state. The water depth range h1 corresponding to the first vibrating tank = L1 + 0.5L2, the water depth range h2 corresponding to the second vibrating tank = H - h1, and the water depth ranges corresponding to the subsequent vibrating tanks are h i = 0, i > 2;

[0020] S204. When L1 + L2 + L3 + 0.1L4 < H < L1 + L2 + L3 + L4 + 0.1L5, the water flow submerges the first vibrating tank, the second vibrating tank, the third vibrating tank and the fourth vibrating tank, but the submergence depth of the fourth vibrating tank is insufficient. The fourth vibrating tank is the same as the situation in step S201 above and is not considered. Then the first vibrating tank, the second vibrating tank and the third vibrating tank are in a completely submerged state. The water depth range h1 corresponding to the first vibrating tank = L1 + 0.5L2, the water depth range h2 corresponding to the second vibrating tank = 0.5L2 + 0.5L3, the water depth range h3 corresponding to the third vibrating tank = H - h1 - h2, and the water depth ranges corresponding to the subsequent vibrating tanks are h i = 0, i > 3;

[0021] S205. When L1 + … + 0.1L m-1 < H < L1 + … + 0.1L mIn the case of (m>4), the water flow submerges the first vibration trough, the second vibration trough, the third vibration trough...the m-1th vibration trough, but the submergence depth of the m-1th vibration trough is insufficient. The m-1th vibration trough is the same as the situation in the above step S201 and is not considered. Then, the first vibration trough to the m-2th vibration trough are in a completely submerged state, and the water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, and the water depth interval corresponding to the second vibration trough to the m-3th vibration trough is h i =0.5L i +0.5L i+1 (1>i≥m-3), the water depth interval h corresponding to the m-2th vibration tank m-2 =H-h1-…-h m-3 , the water depth interval of the subsequent vibration tank is h i =0, i>m-2;

[0022] S3, the information processing system detects the vibration frequency f according to each vibration processor m , calculate the river flow velocity U in the water depth interval corresponding to each vibration processor m = k × f m , where k is the fluid characteristic coefficient;

[0023] S4, the information processing system calculates the unit width flow rate V1 = h1 × U1 of the first water depth interval, calculates the unit width flow rate V2 = h2 × U2 of the second water depth interval, ... calculates the unit width flow rate V1 = h1 × U1 of the m-2 water depth interval m-2 =h m-2 ×U m-2 ;

[0024] S5, the information processing system takes V1, V2...V m-2 The sum of the flow rate per unit width V over the entire river depth H is obtained. 总 ;

[0025] S6, the information processing system according to the formula S = V 总 ×W is used to calculate the water flow rate per unit time in the river channel, where W is the width of the river channel and S is the water flow rate per unit time in the river channel.

[0026] As described above, the urban river flow measurement device and measurement method of the present invention have the following beneficial effects: the urban river flow measurement device and measurement method based on the present invention can realize the effective measurement of shallow water level river flow in urban rivers, and has a simple structure, is easy to carry and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the urban river flow measurement device provided by the present invention.

[0029] Figure 2 The present invention provides Figure 1 Enlarged view of point A in the middle.

[0030] Figure 3 Shown is a cross-sectional view of the urban river flow measurement device provided by the present invention.

[0031] Figure 4 The present invention provides Figure 3 A magnified image of point B in the middle.

[0032] Figure 5 The present invention provides Figure 3 A magnified image of point C in the middle.

[0033] Figure 6 Shown is a schematic diagram of a first usage of the urban river flow measurement device provided by the present invention.

[0034] Figure 7 Shown is a schematic diagram of a second usage of the urban river flow measurement device provided by the present invention.

[0035] Figure 8 Shown is a schematic diagram of the water depth status in step S201 provided by the present invention.

[0036] Fig. 9 Shown is a schematic diagram of the water depth status in step S202 provided by the present invention.

[0037] Fig.10 Shown is a schematic diagram of the water depth status in step S203 provided by the present invention.

[0038] Fig.11 Shown is a schematic diagram of the water depth status in step S204 provided by the present invention.

[0039] Fig.12 Shown is a schematic diagram of a first usage of the urban river flow measurement device provided by the present invention.

[0040] Fig.13 Shown is a schematic diagram of a second usage of the urban river flow measurement device provided by the present invention.

[0041] Fig.14Shown is a schematic diagram of the third usage of the urban river flow measurement device provided by the present invention.

[0042] Description of Reference Numerals

[0043] 10 Fixing the bottom plate

[0044] 20 Shell cylinder

[0045] 21 Base cylinder

[0046] 22 Main cylinder

[0047] 23 Connector

[0048] 230 Rubber flange

[0049] 231 Upper screw

[0050] 232 Lower screw

[0051] 201 Water Inlet

[0052] 202 Water Depth Sensor

[0053] 203 Vibration Tank

[0054] 204 Vibrating membrane

[0055] 205 Vibration Processor

[0056] 206 Transmission Antenna

[0057] 207 Fixed Platform

[0058] 208 Sealing plate

[0059] 209 waterproof cap

[0060] 100 River

[0061] 200 Measuring device DETAILED DESCRIPTION

[0062] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0063] In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0065] See also Figures 1 to 7 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0066] A first aspect of the present invention provides a device for measuring flow in a city river (hereinafter referred to as "the measuring device"), such as Figures 1 to 5 As shown, the measuring device 200 includes a fixed bottom plate 10 and an outer shell cylinder 20, wherein the fixed bottom plate 10 is used to be fixedly set at the bottom of the river channel 100, and is installed by counterweight / gravel ballast fixation or bolt fixation, and the outer shell cylinder 20 is fixedly set on the fixed bottom plate 10. Specifically, a plurality of water inlet holes 201 are provided at the bottom end of the outer shell cylinder 20, and the plurality of water inlet holes 201 are evenly spaced along the circumferential direction of the outer shell cylinder 20, and a water depth sensor 202 is provided inside the bottom end of the outer shell cylinder 20; m vibration grooves 203 are spaced on the side wall of the outer shell cylinder 20 along the axial direction of the outer shell cylinder 20. Specifically, for the convenience of subsequent description, as shown in FIG. Figure 3 As shown, the distance between the first vibration groove and the fixed bottom 10 is limited to L1, the distance between the second vibration groove and the first vibration groove is L2, the distance between the third vibration groove and the second vibration groove is L3, ... the distance between the mth vibration groove and the m-1th vibration groove is L m; Each vibration groove 203 is communicated with the interior of the outer shell cylinder 20, and a vibration film 204 is provided at the opening of each vibration groove 203 near the interior of the outer shell cylinder, and the vibration film is used to detect the vibration of river water. Correspondingly, a vibration processor 205 is provided at a position corresponding to each vibration film 204 inside the outer shell cylinder 20, and each vibration processor 205 is connected one-to-one with each vibration film 204. The vibration sensor 205 is used to obtain the vibration frequency of the vibration film based on the vibration information fed back by the vibration film 204; specifically, a transmission antenna 206 is also provided on the top of the outer shell cylinder 20, and the water depth sensor 202 and each vibration processor 205 are connected to the transmission antenna 206; the transmission antenna 206 is communicatively connected to an information processing system (not shown in the figure).

[0067] The beneficial effects of the urban river flow measurement device of the present invention are: when used, Figure 6 As shown, the measuring device 200 is fixed in the river channel 100, and the direction of the vibration groove 203 on the outer shell cylinder 20 is the same as the direction of the river flow. The water depth H of the river in the river channel 100 is detected by the water depth sensor 202 arranged at the bottom of the outer shell cylinder 20. The water depth sensor 202 transmits the detected river water depth H to the information processing system through the transmission antenna 206. Considering that the flow velocity of the river at different water levels may be different, the river water depth H is divided into multiple water depth intervals by the information processing system, that is, the multiple vibration grooves arranged at intervals along the axial direction of the outer shell cylinder 20 are respectively configured with corresponding water depth intervals. The division of the water depth interval corresponding to each vibration groove is specifically described in steps S201 to S205 in the measurement method, and will not be repeated here; according to fluid mechanics, when the incoming flow under certain conditions bypasses certain objects, the two sides of the object will periodically shed double-row line vortices with opposite rotation directions and regular arrangement. After nonlinear action, it will A Karman vortex street is formed, so after the water flows through the outer shell cylinder 20, a Karman vortex street will be formed on both sides of the outer shell cylinder 20. The water flow line vortex formed by the Karman vortex street will produce agitation, and the shock wave will propagate in four directions in the water body. When the shock wave enters the vibration groove 203, the corresponding frequency amplitude is further amplified due to the resonance effect, and then it will stimulate the vibration film 204 at the bottom of the vibration groove 203, causing the vibration film 204 to vibrate, and the vibration frequency f1 of the first vibration film in the first vibration groove corresponding to the first water depth interval is detected by the first vibration processor, and the vibration frequency f2 of the second vibration film in the second vibration groove corresponding to the second water depth interval is detected by the second vibration processor, ... The vibration frequency f of the m-2th vibration film in the m-2th vibration groove corresponding to the m-2th water depth interval is detected by the m-2th vibration processor. m-2 , then according to the formula U m = k × f mCalculate the river flow rate in each water depth interval (k is the fluid characteristic coefficient, which can be obtained by measurement), then calculate the unit width flow rate V1 = h1 × U1 in the first water depth interval, calculate the unit width flow rate V2 = h2 × U2 in the second water depth interval, and so on. Calculate the unit width flow rate V in the m-2th water depth interval m-2 =h m-2 ×U m-2 Then take the unit width flow rate V1 of the first water depth interval, the unit width flow rate V2 of the second water depth interval, ... the unit width flow rate V of the m-2th water depth interval m-2 The sum of the flow rate per unit width V over the entire river depth H is obtained 总 ; Then according to the formula S = V 总 ×W calculates the water flow rate of the river per unit time, where W is the width of the river and S is the water flow rate of the river per unit time. Therefore, the urban river flow measurement device of the present invention can effectively measure the shallow water level river flow rate in the urban river, and has a simple structure, is easy to carry and has low cost.

[0068] Specifically, considering that the flow velocity of a river varies in the width direction, when using it, Figure 7 As shown, a plurality of measuring devices 200 may be evenly spaced in the width direction of the river channel 100, and the width of the river channel 100 may be divided into a plurality of small width segments, each measuring device 200 being responsible for the river flow in the corresponding small width segment, and then the river flow measured by the plurality of measuring devices is added together to obtain the river flow over the entire width of the river channel 100.

[0069] Specifically, Figure 6 and Fig.12 As shown, when there is only one measuring device at the river width distance, the information processing system uses the formula S = V 总 ×W is used to calculate the water flow rate per unit time in the river channel, where W is the width of the river channel and S is the water flow rate per unit time in the river channel;

[0070] like Fig.13 As shown, when two measuring devices are provided at the river width distance, the information processing system uses the formula S = V 总1 ×W1+V 总2 ×W2 calculates the river flow per unit time in the river channel, where V 总1 is the total flow per unit width calculated by the left measuring device over the entire river depth H, W1 is the nearest river width corresponding to the left measuring device; V 总2 It is the total flow per unit width at the entire river depth H calculated by the measuring device on the right, W2 is the nearest river width corresponding to the measuring device on the right, and S is the river flow per unit time in the river.

[0071] When n measuring devices are provided on the width of the river channel, the information processing system uses the formula S=V 总1 ×W1+…+V 总n ×W n Calculate the river flow per unit time in the river channel, where W n is the width of the nearest river channel corresponding to the nth measuring device. Specifically, if it is a nearshore measuring device, W represents the midpoint from the shore to the measuring device and the adjacent measuring device (when the shoreline is a trapezoid, it can be corrected according to the embankment structure). If it is a non-nearshore measuring device, W represents the distance between the middle of the adjacent measuring devices on both sides of the device. S is the river flow per unit time in the river channel. Fig.14 shown.

[0072] Specifically, it should be noted that, in this embodiment, by designing the vibration groove 203 to a specific size, other external high-frequency background noise can be consumed, so that the vibration groove can only receive the vibration generated by the Karman vortex street, thereby improving the signal-to-noise ratio of the vibration generated by the Karman vortex street and improving the quality and accuracy of detection.

[0073] Furthermore, considering that there are many gravels at the bottom of some urban rivers, in order to prevent the vibration caused by the river impacting the gravel from affecting the detection, or the vibration caused by the Karman vortex street generated around the gravel from affecting the detection, it is preferred that Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the outer shell cylinder 20 includes a base cylinder 21 and a main cylinder 22 connected to the base cylinder 21. Specifically, an elastic damping member is provided between the base cylinder 21 and the main cylinder 22. Accordingly, the base cylinder 21 is fixedly arranged on the fixed bottom plate 10, a plurality of water inlet holes 201 are arranged on the base cylinder 21, a water depth sensor 202 is arranged inside the base cylinder 21, and m vibration grooves 203 are arranged on the main cylinder 22 at intervals along the axial direction of the main cylinder 22. Through this structural design, that is, by splitting the outer shell cylinder 20 into two sections, namely the base cylinder 21 and the main cylinder 22, and providing an elastic damping member between the base cylinder 21 and the main cylinder 22, the influence of gravel around the fixed bottom plate 10 on the detection can be reduced, thereby further improving the detection accuracy. Specifically, in this embodiment, a connection hole is provided on the fixed bottom 10, and the fixed bottom plate is fixed to the bottom of the river channel by penetration of expansion bolts in the connection hole.

[0074] Preferably, Figure 4As shown, in this embodiment, the base cylinder 21 is connected to the main cylinder 22 through a connector 23. Specifically, the connector 23 includes an upper screw 231 and a lower screw 232, and a rubber flange 230 is provided in the middle of the connector 23. The upper screw 231 of the connector 23 is threadedly connected to the inner wall of the main cylinder 22, and the lower screw 232 of the connector 23 is threadedly connected to the inner wall of the base cylinder 21. The rubber flange 230 in the middle of the connector 23 is sandwiched between the base cylinder 21 and the main cylinder 22 to form the elastic vibration damping member. The base cylinder 21 and the main cylinder 22 are detachably connected through the connector 23, so as to facilitate the later maintenance and replacement of the water depth sensor arranged inside the base cylinder. The elastic vibration damping member is made of rubber material, which has good wear resistance and long service life.

[0075] Preferably, Figure 5 As shown, in this embodiment, a plurality of fixed platforms 207 are provided inside the outer shell cylinder 20 along the axial direction of the outer shell cylinder 20, and the vibration processor 205 is provided on the fixed platform 207. Preferably, in order to further reduce the influence of the vibration of the fixed bottom plate or the base cylinder on the detection of the vibration processor provided on the main cylinder 22, in this embodiment, an elastic vibration damping pad is provided between the vibration sensor 205 and the fixed platform 207. Specifically, the material of the elastic vibration damping pad can be rubber. And preferably, the elastic vibration damping pad can be fixed between the vibration sensor and the fixed platform by elastic glue.

[0076] Preferably, in this embodiment, the vibration film 204 is a piezoelectric ceramic. Piezoelectric ceramic is an electronic ceramic material with piezoelectric properties. Its principle is based on the piezoresistive effect. Pressure directly acts on the front surface of the ceramic diaphragm, causing the diaphragm to produce a slight deformation, thereby generating a highly linear voltage signal that is proportional to the pressure and proportional to the excitation voltage. The vibration processor detects the change in the voltage signal of the vibration film and obtains the vibration frequency of the vibration film.

[0077] Preferably, Figure 4 As shown, in this embodiment, a sealing plate 208 is further provided inside the outer shell cylinder 20, i.e., the main cylinder 22, and the height of the sealing plate 208 is lower than the height of the first vibration groove, i.e., also lower than the height of the first vibration processor (the vibration sensor closest to the base cylinder). The provision of the sealing plate 208 can prevent river water from entering the interior of the main cylinder 22 and flooding the vibration processor provided inside the main cylinder, thereby increasing the service life of the vibration processor.

[0078] Preferably, Figure 4As shown, in this embodiment, there is a set gap between the water depth sensor 202 and the fixed base plate. Through the setting of this set gap, a space for silt accumulation is provided, so as to prevent the silt from wrapping the water depth sensor and causing interference to the detection, and improve the stability and accuracy of the detection.

[0079] Preferably, as Figure 1 shown, in this embodiment, a waterproof cap 209 is further provided at the top of the outer shell cylinder 20. Through the setting of this waterproof cap 209, it can prevent the river water from submerging the top of the outer shell cylinder 20 and entering the interior of the outer shell cylinder 20. At the same time, it can also prevent rainwater from entering the interior of the outer shell cylinder 20 and corroding the vibration processor on rainy days, thereby increasing the service life of this measuring device.

[0080] The second aspect of the present invention also provides a method for measuring the flow rate of an urban river channel using the above-mentioned urban river channel flow rate measuring device. The method for measuring the flow rate of an urban river channel specifically includes the following steps:

[0081] S1. Obtain the water depth H of the river water in the river channel through the water depth sensor, and transmit the detected river water depth H to the information processing system;

[0082] S2. The information processing system configures a corresponding water depth range for each vibration tank according to the river water depth H;

[0083] S201. When H < L1 + 0.1L2, that is, the water flow does not completely submerge the first vibration tank, or the water flow submerges the first vibration tank but the submergence depth is insufficient, the water surface waves will interfere with the vibration tank. At this time, the water level is too low, and the flow rate measuring device does not perform measurement;

[0084] The state schematic diagram of this step S201 is specifically as Figure 8 shown.

[0085] S202. When L1 + 0.1L2 < H < L1 + L2 + 0.1L3, the water flow submerges the first vibration tank and the second vibration tank, but the submergence depth of the second vibration tank is insufficient. The second vibration tank is the same as the situation in the above step S201 and is not considered. Then the water depth range h1 corresponding to the first vibration tank = H, and the water depth ranges corresponding to the subsequent vibration tanks are h i = 0, i > 1;

[0086] The state schematic diagram of this step S202 is specifically as Fig. 9 shown.

[0087] S203, when L1+L2+0.1L3<H<L1+L2+L3+0.1L4, the water flow submerges the first vibration trough, the second vibration trough and the third vibration trough, but the submergence depth of the third vibration trough is insufficient. The third vibration trough is the same as the above step S201 and is not considered. At this time, the first vibration trough and the second vibration trough are in a completely submerged state. The water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, the water depth interval corresponding to the second vibration trough is h2=H-h1, and the water depth interval corresponding to the subsequent vibration trough is h i =0, i>2;

[0088] The state diagram of step S203 is as follows: Fig.10 shown.

[0089] S204, when L1+L2+L3+0.1L4<H<L1+L2+L3+L4+0.1L5, the water flow submerges the first vibration trough, the second vibration trough, the third vibration trough, and the fourth vibration trough, but the submergence depth of the fourth vibration trough is insufficient. The fourth vibration trough is the same as the above step S201 and is not considered. Then the first vibration trough, the second vibration trough, and the third vibration trough are in a completely submerged state. The water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, the water depth interval corresponding to the second vibration trough is h2=0.5L2+0.5L3, the water depth interval corresponding to the third vibration trough is h3=H-h1-h2, and the water depth interval corresponding to the subsequent vibration trough is h i =0, i>3;

[0090] The state diagram of step S204 is as follows: Fig.11 shown.

[0091] S205, when L1+…+0.1L m-1 <H<L1+…+0.1L m In the case of (m>4), the water flow submerges the first vibration trough, the second vibration trough, the third vibration trough...the m-1th vibration trough, but the submergence depth of the m-1th vibration trough is insufficient. The m-1th vibration trough is the same as the situation in the above step S201 and is not considered. Then, the first vibration trough to the m-2th vibration trough are in a completely submerged state, and the water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, and the water depth interval corresponding to the second vibration trough to the m-3th vibration trough is h i =0.5L i +0.5L i+1 (1>i>m-3), the water depth interval h corresponding to the m-2th vibration tank m-2 =H-h1-…-h m-3 , the water depth interval of the subsequent vibration tank is h i =0, i>m-2;

[0092] S3, the information processing system detects the vibration frequency f according to each vibration processor m , calculate the river flow velocity U in the water depth interval corresponding to each vibration processor m = k × f m , where k is the fluid characteristic coefficient;

[0093] S4, the information processing system calculates the unit width flow rate V1 = h1 × U1 of the first water depth interval, calculates the unit width flow rate V2 = h2 × U2 of the second water depth interval, ... calculates the unit width flow rate V1 = h1 × U1 of the m-2 water depth interval m-2 =h m-2 ×U m-2 ;

[0094] S5, the information processing system takes V1, V2...V m-2 The sum of the flow rate per unit width V over the entire river depth H is obtained. 总 ;

[0095] S6, the information processing system according to the formula S = V 总 ×W is used to calculate the water flow rate per unit time in the river channel, where W is the width of the river channel and S is the water flow rate per unit time in the river channel.

[0096] The urban river flow measurement method of the present invention has the same beneficial effects as the urban river flow measurement device described above, so it will not be described in detail here.

[0097] In summary, the urban river flow measurement device and method of the present invention can effectively measure the shallow water level river flow in the urban river, and has a simple structure, is easy to carry, and has low cost. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0098] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for measuring flow in urban rivers, characterized in that: Including: A fixed bottom plate, which is used for being fixedly arranged at the bottom of a river channel; A housing cylinder body, which is fixedly arranged on the fixed bottom plate. A plurality of water inlet openings are arranged at the bottom end of the housing cylinder body. The plurality of water inlet openings are evenly spaced along the circumferential direction of the housing cylinder body, and a water depth sensor is arranged inside the bottom end of the housing cylinder body; m vibration grooves are arranged on the side wall of the outer shell cylinder along the axial direction of the outer shell cylinder, wherein the distance from the first vibration groove to the fixed bottom plate is L1, the distance from the second vibration groove to the first vibration groove is L2, the distance from the third vibration groove to the second vibration groove is L3, ... the distance from the mth vibration groove to the m-1th vibration groove is L m ; Each vibration groove communicates with the inside of the housing cylinder body, and a vibration film is arranged at the opening of each vibration groove close to the inside of the housing cylinder body. The vibration film is used for detecting the vibration of the river flow. A vibration processor is arranged at a position corresponding to each vibration film inside the housing cylinder body. Each vibration processor is connected to each vibration film in a one-to-one correspondence. The vibration sensor obtains the vibration frequency of the vibration film based on the vibration information fed back by the vibration film; A transmission antenna, which is arranged at the top of the housing cylinder body. The water depth sensor and each vibration processor are both connected to the transmission antenna; An information processing system, and the transmission antenna is communicatively connected to the information processing system.

2. The urban river flow measurement device according to claim 1, characterized in that: The housing cylinder body includes a base cylinder body and a main cylinder body connected to the base cylinder body, and an elastic shock absorber is arranged between the base cylinder body and the main cylinder body; the base cylinder body is fixedly arranged on the fixed bottom plate, the plurality of water inlet openings are arranged on the base cylinder body, the water depth sensor is arranged inside the base cylinder body, and m vibration grooves are arranged on the main cylinder body.

3. The urban river flow measurement device according to claim 2, characterized in that: The main cylinder body is connected to the base cylinder body through a connector. The connector includes an upper screw rod and a lower screw rod, and a rubber flange is arranged in the middle of the connector. The upper screw rod is threadedly connected to the inner wall of the main cylinder body, the lower screw rod is threadedly connected to the inner wall of the base cylinder body, and the rubber flange is clamped between the base cylinder body and the main cylinder body to form the elastic shock absorber.

4. The urban river flow measurement device according to claim 1, characterized in that: A plurality of fixed platforms are arranged inside the housing cylinder body along the axial direction of the housing cylinder body, and the vibration processors are arranged on the fixed platforms.

5. The urban river flow measurement device according to claim 4, characterized in that: An elastic shock pad is arranged between the vibration sensor and the fixed platform.

6. The urban river flow measurement device according to claim 1, characterized in that: The vibration film is a piezoelectric ceramic sheet.

7. The urban river flow measurement device according to claim 1, characterized in that: A sealing plate is arranged inside the housing cylinder body, and the height at which the sealing plate is arranged is lower than the height of the first vibration groove.

8. The urban river flow measurement device according to claim 1, characterized in that: A waterproof cap is arranged at the top of the housing cylinder body.

9. The urban river flow measurement device according to claim 1, characterized in that: A set gap is arranged between the water depth sensor and the fixed bottom plate.

10. A method for measuring the flow rate of an urban river using the urban river flow rate measuring device according to any one of claims 1 to 9, characterized in that: The method for measuring the flow rate of an urban river channel includes the following steps: S1. Obtain the water depth H of the river in the river channel through the water depth sensor, and transmit the detected river water depth H to the information processing system; S2. The information processing system configures a corresponding water depth interval for each vibration groove according to the river water depth H; S201. When H < L1 + 0.1L2, that is, when the water flow does not completely submerge the first vibration groove, or when the water flow submerges the first vibration groove but the submergence depth is insufficient, the water surface water wave will interfere with the vibration groove. At this time, the water level is too low, and the flow measurement device does not perform measurement; S202, when L1+0.1L2<H<L1+L2+0.1L3, the water flow submerges the first vibration trough and the second vibration trough, but the submergence depth of the second vibration trough is insufficient. The second vibration trough is the same as the above step S201 and is not considered. Then the water depth interval corresponding to the first vibration trough is h1=H, and the water depth interval corresponding to the subsequent vibration trough is h i =0, i>1; S203, when L1+L2+0.1L3<H<L1+L2+L3+0.1L4, the water flow submerges the first vibration trough, the second vibration trough and the third vibration trough, but the submergence depth of the third vibration trough is insufficient. The third vibration trough is the same as the above step S201 and is not considered. At this time, the first vibration trough and the second vibration trough are in a completely submerged state. The water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, the water depth interval corresponding to the second vibration trough is h2=H-h1, and the water depth interval corresponding to the subsequent vibration trough is h i =0, i>2; S204, when L1+L2+L3+0.1L4<H<L1+L2+L3+L4+0.1L5, the water flow submerges the first vibration trough, the second vibration trough, the third vibration trough, and the fourth vibration trough, but the submergence depth of the fourth vibration trough is insufficient. The fourth vibration trough is the same as the above step S201 and is not considered. Then the first vibration trough, the second vibration trough, and the third vibration trough are in a completely submerged state. The water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, the water depth interval corresponding to the second vibration trough is h2=0.5L2+0.5L3, the water depth interval corresponding to the third vibration trough is h3=H-h1-h2, and the water depth interval corresponding to the subsequent vibration trough is h i =0, i>3; S205, when L1+…+0.1L m-1 <H<L1+…+0.1L m In the case of (m>4), the water flow submerges the first vibration trough, the second vibration trough, the third vibration trough...the m-1th vibration trough, but the submergence depth of the m-1th vibration trough is insufficient. The m-1th vibration trough is the same as the situation in the above step S201 and is not considered. Then, the first vibration trough to the m-2th vibration trough are in a completely submerged state, and the water depth interval corresponding to the first vibration trough is h1=L1+0.5L2, and the water depth interval corresponding to the second vibration trough to the m-3th vibration trough is h i =0.5L i +0.5L i+1 (1>i>m-3), the water depth interval h corresponding to the m-2th vibration tank m-2 =H-h1-…-h m-3 , the water depth interval of the subsequent vibration tank is h i =0, i>m-2; S3, the information processing system detects the vibration frequency f according to each vibration processor m , calculate the river flow velocity U in the water depth interval corresponding to each vibration processor m = k × f m , where k is the fluid characteristic coefficient; S4, the information processing system calculates the unit width flow rate V1 = h1 × U1 of the first water depth interval, calculates the unit width flow rate V2 = h2 × U2 of the second water depth interval, ... calculates the unit width flow rate V1 = h1 × U1 of the m-2 water depth interval m-2 =h m-2 ×U m-2 ; S5, the information processing system takes V1, V2...V m-2 The sum of the flow rate per unit width V over the entire river depth H is obtained. 总 ; S6, the information processing system according to the formula S = V 总 ×W is used to calculate the water flow rate per unit time in the river channel, where W is the width of the river channel and S is the water flow rate per unit time in the river channel.

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