CN209961260U - Fixed-point suspension type ice thickness and water level integrated continuous monitoring device - Google Patents
Fixed-point suspension type ice thickness and water level integrated continuous monitoring device Download PDFInfo
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- CN209961260U CN209961260U CN201920297138.0U CN201920297138U CN209961260U CN 209961260 U CN209961260 U CN 209961260U CN 201920297138 U CN201920297138 U CN 201920297138U CN 209961260 U CN209961260 U CN 209961260U
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Abstract
The utility model relates to a fixed point suspension type ice thickness, water level integration continuous monitoring device belongs to hydrology monitoring technology field. The device of the utility model is composed of a lightning arrester, a wind power generation device, a triangular steel tower, a solar power generation device, a mounting base, an energy storage battery, a rotary arm, an air coupling radar sensor and an integrated control box (including a wind-solar complementary controller, a remote measuring switch, a GPS module and a 4G data transmission module). After the device is installed, the remote computer starts each module through GSM to send related parameters to the radar sensor, the 4G data transmission module receives a radar map with GPS time labels, and the two-way time t of radar waves in the air is recorded according to the radar map1And in ice coversThe distance H between the radar and the upper surface of the ice cover and the thickness H of the ice cover are automatically calculated by using the formula (three) or (four), and the elevation H of the upper surface of the ice cover or the free water surface is automatically calculated by using the formula (five) or (six)1And ice cover lower surface elevation H2。
Description
Technical Field
The utility model belongs to the technical field of hydrology monitoring in the water conservancy trade, especially, relate to a long-range continuous monitoring device of ice thickness, water level integration.
Background
The ice thickness refers to the vertical distance from the upper surface of the ice layer to the lower surface of the ice layer after the ice cover is formed by freezing the river channel in winter. In northern areas of China, rivers and lakes are easy to freeze to form ice covers, such as black dragon river, Songhua river, Huanghening Mongolian river and the like.
Ice thickness monitoring is typically accomplished with the aid of ice drills and ice rulers, monitoring average ice thickness and maximum ice thickness (in centimeters), particularly at particular terrain and locations, such as at hydrological test sections, at curves in river channels, at structures involved in rivers, and the like. The biggest defect of using the technology to monitor the ice thickness is that manual ice hole drilling measurement is needed, time and labor are wasted, the automation degree is low, continuous monitoring cannot be realized, and the safety of personnel is threatened, particularly the ice thickness monitoring at the thin part of the ice cover and the unstable ice cover formed by the ice plug.
The existing technology for monitoring the ice thickness by a thermal resistance method is an automatic monitoring technology for monitoring the temperature gradient of the ice layer by using a temperature sensor to estimate the thickness of the ice layer, the technology needs to embed the temperature sensor in advance, the labor intensity is high, the ice thickness in the ice cover period can only be monitored stably, the whole period of the ice thickness elimination and the integrated continuous monitoring of the water level of the ice thickness are not facilitated, and the continuous monitoring of the ice thickness in the same place for many years is also not facilitated.
The existing water level monitoring technology mostly adopts a water gauge or a 26GHz radar water level gauge, and the technology can only monitor the water level change process remotely), can only monitor the height change of the upper surface of an ice layer in the ice flood season, can not monitor the ice cover life and consumption change process and the water level change process under ice, and is not beneficial to the hydrological multi-factor full-period uninterrupted continuous monitoring of northern river channels and lakes.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fixed point suspension type ice thickness, water level integration continuous monitoring device, use the device not only can be at ice surface elevation, water level and ice sheet thickness variation process under ice in the ice flood season monitoring, but also can monitor free surface of water variation process in the non-ice flood season, the difficult problem of river course, lake, the ice thickness of channel in the north has been solved, water level integration continuous monitoring, realize fixed point position ice thickness, the real-time supervision of water level variation complete cycle, for ice flood season hydrology monitoring provides new mode and new technology.
The technical scheme of the utility model as follows.
The utility model provides a fixed point suspension type ice thickness, water level integration continuous monitoring device, mainly contains arrester (1), wind power generation set (2), triangle steel tower (3), solar power generation set (4), mounting base (5), energy storage battery (6), jib (7), air coupling radar sensor (8), integrated control box (9).
And a wind-solar complementary controller (10), a remote telemetering switch controller (11), a GPS module (12) and a 4G data transmission module (13) are installed in the integrated control box (9).
The installation and connection of the components can refer to fig. 1 and fig. 2.
The lightning arrester (1) can be a BLZ-800 type lightning arrester, and the installation height of a ball in the lightning arrester is higher than the highest position of a fan blade of the wind power generation device (2) by more than 0.2 m.
The wind power generation device (2) adopts the formula (I) to calculate the selected output power:
formula (I)
In the formula: p is the output power (w); t is tiFor installation areaAverage days of the wind month (d) class i; w is aiThe power (w) corresponding to i-level wind of the installation area is obtained.
Triangle-shaped steel tower (3) comprises three steel pipes and horizontal bracing piece, and three steel pipes constitute equilateral triangle, and steel pipe diameter 50mm, horizontal bracing piece adopt the twisted steel, and the interval is not more than 20cm, and triangle-shaped steel tower buries in the base.
The power of the solar panel with the selected model can be calculated by adopting the following formula (II):
Wherein: w is the panel power (W); a is the average daily power consumption (w/h) of the whole device; c is a capacity coefficient; h is the local average sunshine duration (h) per day;
is an assembly loss factor;is a temperature loss factor;
a dust shadowing loss factor;
is a charge-discharge loss factor;
is a power transmission and distribution loss factor.
The mounting base (5) is of a masonry structure, and the part buried below the ground is not less than 1 m.
The energy storage battery (6) adopts a low temperature resistant silicon energy battery and is arranged in the integrated control box (9) or is buried below 1m of the ground in the base.
The rotary arm (7) is composed of two steel pipes with different sizes, the diameters of the two steel pipes are 45mm and 50mm respectively, each steel pipe is 15m, the two steel pipes are connected in a nesting mode, holes with the diameter of 8mm are drilled in the positions of the connection positions of the two steel pipes every 5cm, then the two steel pipes are fixed through long screws (21) with the diameter of 6mm, one end of the rotary arm is welded with a sleeve (23) perpendicular to a cross rod of the rotary arm, the diameter of the sleeve is 55mm, the length of the sleeve is 15cm, after the rotary arm sleeve (23) is sleeved into one steel pipe of the triangular steel tower, a hysteresis ring (24) is welded on the triangular steel tower steel pipe at the lower.
The air coupling radar sensor (8) mainly comprises a radar controller (14), a transmitter (15), a receiver (16), a transmitting antenna, a receiving antenna, a power supply interface and a data interface.
The working mode of ice thickness detection of the air coupling radar sensor (8) is shown in an attached figure 3, a remote computer sends related parameters such as radar wave air propagation speed, ice dielectric constant, sampling point number, sampling frequency, accumulation times and acquisition interval time to a radar controller through a 4G data transmission module (13), the remote computer automatically calculates the distance from the center of the bottom of the air coupling radar sensor (8) to the upper surface of the ice cover in the ice flood season or the free water surface in the non-ice flood season, then calculates the thickness of the ice cover, and converts the data into corresponding elevations respectively based on the level elevations around the river channel.
The automatically calculated distance from the radar to the upper surface of the ice cover, ice thickness data and a corresponding radar map are transmitted back to a remote computer through a 4G data transmission module (13).
The radar controller (14) in the air coupling radar sensor (8) realizes the functions of data interface communication, transmitter trigger signals, receiver stepping sampling clocks and receiver output signal analog-to-digital conversion, and the internal working time sequence is shown in figure 4.
And a transmitter (15) in the air coupling radar sensor (8) selects an avalanche triode and a Step Recovery Diode (SRD) device to form a pulse source circuit.
A receiver (16) in the air coupling radar sensor (8) performs frequency reduction processing on signals by adopting an equivalent sampling technology, and echo signals after frequency reduction are audio signals.
A transmitting antenna corresponding to a transmitter (15) and a receiving antenna corresponding to a receiver (16) in the air coupling radar sensor (8) adopt a Bow-tie antenna or a UWB antenna with a deformed structure thereof, so that the ultra-wideband characteristic is realized.
The air coupling radar sensor (8) is fixed in the range of 1m at the tail end of the rotating arm (7) by adopting 3U-shaped bolts.
The integrated control box (9) mainly comprises a wind and light complementary controller (10), a remote telemetering switch (11), a GPS module (12) and a 4G data transmission module (13), wherein the GPS module (12) is connected with the remote telemetering switch (11), the 4G data transmission module (13) is connected with the remote telemetering switch (11), the wind and light complementary controller (10) is connected with the remote telemetering switch (11), and the position arrangement and connection mode of each module are shown in figure 2.
The wind-solar hybrid controller (10) selects a maximum power point tracking controller MPPT, the controller can track the maximum voltage and current value, the work of a solar cell panel, a storage battery and a load can be effectively coordinated, and the charging efficiency can reach 95%. The working mode is that the electric energy of the wind power generation device (2) and the solar power generation device (4) is transmitted into the remote telemetering switch (11) through the wind-solar complementary controller (10) or is stored in the energy storage battery (6), and meanwhile, the electric energy stored by the energy storage battery (6) can be transmitted into the remote telemetering switch (11) through the wind-solar complementary controller (10) in the absence of light and wind.
The remote telemetering switch (11) can be selected from an ST248-TAS type controller, and the working mode is that a GSM antenna receives a mobile phone or computer remote transmission control signal to control the air coupling radar sensor (8), the GPS module (12) and the 4G data transmission module (13) to be started.
The GPS module (12) can select a GPS15xL model, is used for providing pulse per second signals PPS and time information for the air coupling radar sensor (8), can perform timing according to the PPS signals, and can control the acquisition interval time of data of the air coupling radar sensor (8). In addition, time information provided by the GPS is recorded in return data of the air coupling radar sensor (8), and radar echo data is time-stamped, so that the radar data can be backtracked according to time.
The 4G data transmission module (13) can select MZ382 model, and its effect is realized the long-range wireless communication between air coupling radar sensor (8) and the remote computer, establishes data link, and the radar data of gathering is transmitted back to the remote computer in real time, and this model 4G data transmission module has the WIFI function simultaneously, can pass through the WIFI functional connection radar on the scene, tests radar data acquisition quality.
The utility model discloses a technical advantage lies in that it is convenient to install, the life cycle is long, automatic continuous monitoring all the year round, non-contact monitoring ice cover thickness, reduce the monitoring risk on the personnel ice, the central frequency of its main research and development does not need to contact ice cover surface for 400 MHz's air coupling radar sensor, just can survey ice cover thickness in the scope apart from ice cover upper surface 15m, can not only survey ice cover and give birth to the disappearance change process, and can also survey the distance of ice cover upper surface to radar, thereby monitoring the fluctuation of ice cover, provide data for the early warning of freezing the river course, in addition can also be at the non-ice flood season the change process of monitoring under the ice water level, can realize ice cover in ice flood season and non-flood season give birth to the disappearance and the normal position full cycle dynamic monitoring of water level, for hydrology remote monitoring, survey and provide new mode and technique.
Drawings
Fig. 1 is a schematic view of the installation position of each component in the utility model device.
The arrangement and the connection mode of the internal components of the integrated control box are shown in the figure 2.
FIG. 3 is a diagram of the operation of an air-coupled radar sensor.
FIG. 4 is a timing diagram of the internal operation of the radar controller.
Fig. 5 is a block diagram of an equivalent sampling receiver.
Fig. 6 is a schematic view of the construction of the swivel arm.
The device comprises a lightning arrester (1), a wind power generation device (2), a triangular steel tower (3), a solar power generation device (4), a base (5), an energy storage battery (6), a rotating arm (7), an air coupling radar sensor (8), a centralized control box (9), a wind-solar complementary controller (10), a remote telemetering switch (11), a GPS module (12), a 4G digital transmission module (13), a radar controller (14), a transmitter (15), a receiver (16), an ice hole (17), an ice river cover (18), an upward pull wire nut (19), a small-caliber cantilever steel pipe (20), a long screw (21), a large-caliber cantilever steel pipe (22), a sleeve (23), a blocking ring (24), a downward pull wire nut (25) and a top pull wire nut (26).
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings 1 to 5.
The utility model discloses an ice thickness, water level integration monitoring devices, when concrete application, the implementation step includes: prefabricating each component of the device, purchasing equipment, installing each component of the device on site, testing the application and calibrating the punching.
The method comprises the following steps: the components of the device are prefabricated or selected.
Adopt the subassembly prefabricated and lectotype mode preparation the utility model discloses an ice thickness and water level integration remote monitoring device, the device contains: nine components of a lightning arrester (1), a wind power generation device (2), a triangular steel tower (3), a solar power generation device (4), a mounting base (5), an energy storage battery (6), a rotating arm (7), an air coupling radar sensor (8) (hereinafter referred to as a radar) and an integrated control box (9).
a) The lightning arrester (1) is prefabricated or purchased, the total length of the prefabricated or purchased lightning arrester is 20cm-40cm, the lightning arrester is spherical, the diameter of the lightning arrester is 10cm, the lightning arrester is provided with three short lightning rods and one long lightning rod, a triangular base is convenient to install on the top of the triangular steel tower (3), and the installation height of the lightning arrester is higher than the highest position of fan blades of the wind power generation device (2) by more than 0.2 m.
b) The wind turbine which needs the wind power generation device (2) and the output power can be calculated by adopting the formula (I).
c) Prefabricated triangle steel tower (3), the triangle steel tower comprises three steel pipes and bracing piece, steel pipe diameter 50mm, horizontal bracing piece adopts the twisted steel, diameter 18mm-25mm, horizontal bracing piece interval is not more than 20cm, set up horizontal bracing piece in the 2m within range of triangle steel tower one end, this side buries in the base, three steel pipes constitute equilateral triangle, length of a side is 50cm-60cm, the triangle steel tower top leans on lower position 1m department, weld a top nut (26) of acting as go-between, reserve the hole of installing wind power generation set (2), solar power system (4) and integrated control box (9).
d) The solar power generation device (4) is purchased, and the required power can be calculated by adopting a formula (II) to purchase the size of the solar cell panel.
e) The selective purchasing of the energy storage battery (6) selects the low-temperature-resistant silicon energy battery, can be buried in the base for 1m below the ground, and can also be installed in the integrated control box (9) to take heat preservation protection measures.
f) Prefabricated spiral arm (7), the appearance is similar horizontal T type, long arm has a diameter 45mm circular steel pipe (20) respectively and one to be diameter 50mm circular steel pipe (22) nested constitution, length is 15m respectively, two steel pipes of junction make an 8mm hole every 5cm, according to the adjustable cantilever length of on-the-spot needs, adopt 6mm screw thread long screw (21) to penetrate and carry out length adjustment in the hole, the one end welding sleeve pipe (23) of spiral arm, diameter 55mm, length 15cm, mainly used is on going into the triangle-shaped steel tower with the arm of circling round, play 180 degrees rotatory effects, in addition respectively weld diameter 5mm in the one end of steel pipe (20) and steel pipe (22) upper and lower stay wire nut (19) and lower stay wire nut (25) in both sides about the one end.
Step two: the components of the device are installed on site.
a) The components in the integrated control box (9) are installed and connected, a wind-solar complementary controller (10), a remote telemetering switch (11), a GPS module (12) and a 4G data transmission module (13) are respectively installed according to the connection mode shown in figure 2, and sufficient wiring for connecting with external equipment is reserved.
b) The lightning arrester (1), the wind power generation device (2), the solar power generation device (4), the integrated control box (9) and the rotary arm (7) are arranged on the triangular steel tower (3) depending on the positions shown in the figure 1, wherein one end of the rotary arm with a sleeve (23) is sleeved in one steel pipe of the triangular steel tower, a hysteresis ring (24) is welded on the steel pipe of the triangular steel tower at the lower side of the sleeve to prevent the rotary arm from falling down, and all components are connected to the integrated control box (9) through a connecting line shown in the figure 2.
c) The method comprises the steps of manufacturing a grouted stone base (5), wherein the length, width and height of the grouted stone base are 1.5m multiplied by 2.5m, the grouted stone base is buried in the part 1m below the ground, the selected position is required to ensure that the distance between a rotary arm and the lowest water level is not more than 15m, directly burying an assembled triangular steel tower into the grouted stone base in advance in the manufacturing process, simultaneously reserving a hole capable of containing an energy storage battery (6) at one side of the grouted stone base, burying a precast pile with the length, width and height of 0.3m multiplied by 1.5m in each 2.5m of the left side and the right side of the base (5), and burying the precast pile below 1m of.
d) The nut (19) is connected with the nut (26) by a steel wire pull wire, and each nut of the nut (25) is connected with 2 pull wires.
e) After the triangular steel tower is fixed, the rotary arm is pulled to one side of the ground, then the air coupling radar sensor (8) is fixed to the end, far away from the ground, of the rotary arm through 3U-shaped screws, and meanwhile the air coupling radar sensor is connected to the centralized control box (9).
Step three: test and punch calibration are applied.
a) Checking whether the connection of each connecting line is correct, and if so, electrifying to check whether each component operates normally.
b) A small plumb bob is tied at the central position of the radar (8), the length of the plumb bob can enable the plumb bob to reach the upper surface of the ice cover, the rotary arm rotates to the position above the ice cover (18) in the river channel, and the remote computer sends related parameters (the relative dielectric constant of the conventional ice) to the radar controller through the 4G data transmission module (13)
Sampling point number, sampling frequency, accumulation times, acquisition interval time and the like), the radar map is transmitted back to a remote computer, and the time t of the radar wave in the air is recorded according to the radar map1And the time Δ t in the ice cover, the computer calculates the distance h from the radar to the upper surface of the ice cover and the thickness h of the ice cover by using a formula (three) and a formula (four), anddetermining the elevation H of the radar (8) base from nearby elevation reference points0Then, the elevation H of the upper surface or the free water surface of the ice cover is calculated by using the formulas (five) and (six)1And ice cover lower surface elevation H2；
Formula (iii):
formula (iv):
formula (v):
formula (iii):
in the formula: h is the distance (cm) from the radar to the upper surface of the ice cover; t is t1The propagation time (ns) of radar waves in air; Δ h is ice cover thickness (cm); c is the propagation speed (cm/ns) of the radar wave in the air; ε is the relative dielectric constant of ice; Δ t radar wave time in ice cover (ns); h0Is the radar (8) top elevation (m); h1Is the ice cover upper surface elevation or free water surface elevation (m); h2Is the ice cover lower surface elevation (m).
c) And measuring the distance h from the radar to the upper surface of the ice cover by using the plumb bob, comparing the distance h with radar data, and correcting the propagation speed C of the radar wave in the air in time according to a comparison result.
d) Punching calibration, namely punching ice holes (17) with the diameter of 15cm respectively under and on two sides of an air coupling radar (8) by using an ice drilling machine, measuring the thickness of ice covers of the three ice holes by using an ice ruler, averaging, and reversely deducing the relative dielectric constant epsilon of ice at a monitoring point by using a formula (IV) according to the actually measured thickness of the ice covers2Replacement of epsilon1。
e) After all the equipment and data are normal, the stay wires of the connecting nuts (25) are fixed on the precast piles embedded at the two sides of the base (5).
Claims (3)
1. The utility model provides a fixed point suspension type ice thickness, water level integration continuous monitoring device which characterized in that, includes arrester (1), wind power generation set (2), triangle steel tower (3), solar power system (4), mounting base (5), energy storage battery (6), swivel arm (7), air coupling radar sensor (8) and integrated control box (9): wherein the content of the first and second substances,
the lightning arrester (1) can be a BLZ-800 type lightning arrester, and the installation height of a ball in the lightning arrester is higher than the highest position of a fan blade of the wind power generation device (2) by more than 0.2 m;
the triangular steel tower (3) is composed of three steel pipes and transverse supporting rods, the three steel pipes form an equilateral triangle, the diameter of each steel pipe is 50mm, the transverse supporting rods are made of twisted steel bars, the distance between every two adjacent transverse supporting rods is not more than 20cm, and the triangular steel tower is buried in the base;
the mounting base (5) is of a masonry structure, and the part buried below the ground is not less than 1 m;
the energy storage battery (6) is a low-temperature-resistant silicon battery and is arranged in the integrated control box (9) or is buried below 1m of the ground in the base;
the rotary arm (7) is composed of two steel pipes with different sizes, the diameters of the two steel pipes are 45mm and 50mm respectively, each steel pipe is 15m, the two steel pipes are connected in a nesting mode, holes with the diameter of 8mm are drilled in the positions of the connection positions of the two steel pipes every 5cm, then the two steel pipes are fixed through long screws (21) with the diameter of 6mm, one end of the rotary arm is welded with a sleeve (23) perpendicular to a cross rod of the rotary arm, the diameter of the sleeve is 55mm, the length of the sleeve is 15cm, after the rotary arm sleeve (23) is sleeved into one steel pipe of the triangular steel tower, a hysteresis ring (24) is welded on the triangular steel tower steel pipe at the lower.
2. The fixed-point suspended type ice thickness and water level integrated continuous monitoring device of claim 1, wherein the air coupling radar sensor (8) is characterized in that the interior of the sensor mainly comprises a radar controller (14), a transmitter (15), a receiver (16), a transmitting antenna, a receiving antenna, a power supply interface and a data interface;
the working mode of the air coupling radar sensor (8) for detecting the ice thickness is that a remote computer sends related parameters such as radar wave air propagation speed, ice dielectric constant, sampling point number, sampling frequency, accumulation times and acquisition interval time to a radar controller (14) through a 4G data transmission module (13), the remote computer automatically calculates the distance from the center of the bottom of the air coupling radar sensor (8) to the upper surface of an ice cover in an ice flood season or a free water surface in a non-ice flood season, then calculates the thickness of the ice cover, and converts corresponding data into corresponding elevations respectively based on the level elevations around a river channel;
a radar controller (14) in the air coupling radar sensor (8) realizes data interface communication, a transmitter trigger signal, a receiver stepping sampling clock and receiver output signal analog-to-digital conversion;
a transmitter (15) in the air coupling radar sensor (8) selects an avalanche triode and an SRD device to form a pulse source circuit;
a receiver (16) in the air coupling radar sensor (8) adopts an equivalent sampling technology to carry out frequency reduction processing technology on signals, and echo signals after frequency reduction are audio signals;
a transmitting antenna corresponding to a transmitter (15) and a receiving antenna corresponding to a receiver (16) in the air coupling radar sensor (8) adopt a Bow-tie antenna or a UWB antenna with a deformed structure thereof to realize the ultra-wideband characteristic;
the air coupling radar sensor (8) is fixed in the range of 1m at the tail end of the rotating arm (7) by adopting 3U-shaped bolts.
3. A fixed-point suspended type ice thickness and water level integrated continuous monitoring device according to claim 1, wherein the integrated control box (9) mainly comprises a wind-solar complementary controller (10), a remote telemetering switch (11), a GPS module (12) and a 4G data transmission module (13) therein, wherein the GPS module (12) is connected with the remote telemetering switch (11), the 4G data transmission module (13) is connected with the remote telemetering switch (11), and the wind-solar complementary controller (10) is connected with the remote telemetering switch (11);
the wind-solar hybrid controller (10) selects a maximum power point tracking controller MPPT, the controller can track the maximum voltage and current value, the work of a solar cell panel, a storage battery and a load can be effectively coordinated, and the charging efficiency can reach 95%;
the wind-solar hybrid controller (10) works in a mode that electric energy of the wind power generation device (2) and the solar power generation device (4) is transmitted into the remote telemetering switch (11) through the wind-solar hybrid controller (10) or is stored in the energy storage battery (6), and meanwhile, the electric energy stored in the energy storage battery (6) can be transmitted into the remote telemetering switch (11) through the wind-solar hybrid controller (10) when no wind exists;
the remote telemetering switch (11) can select an ST248-TAS type controller, and the working mode is that a GSM antenna receives a mobile phone or computer remote transmission control signal to control the air coupling radar sensor (8), the GPS module (12) and the 4G data transmission module (13) to be started;
the GPS module (12) can be a GPS15xL model, is used for providing pulse per second signals PPS and time information for the air coupling radar sensor (8), can perform timing according to the PPS signals, and can control the acquisition interval time of data of the air coupling radar sensor (8);
in addition, time information provided by the GPS is also recorded in return data of the air coupling radar sensor (8), and a time label is marked on radar echo data, so that the radar data can be backtracked according to time;
the 4G data transmission module (13) can select MZ382 model, and the effect is realized the long-range wireless communication between air coupling radar sensor (8) and the remote computer, establishes data link, and the radar map data of gathering is transmitted back to the remote computer in real time, and this model 4G module has the WIFI function simultaneously, can pass through the WIFI function connection air coupling radar sensor (8) on-the-spot, test radar data acquisition quality.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883479A (en) * | 2019-03-10 | 2019-06-14 | 黄河水利委员会黄河水利科学研究院 | A kind of fixed point suspension type ice thickness, water level integration continuous monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883479A (en) * | 2019-03-10 | 2019-06-14 | 黄河水利委员会黄河水利科学研究院 | A kind of fixed point suspension type ice thickness, water level integration continuous monitoring device |
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