CN214252267U - Evapotranspiration determination system for shallow water accumulation environment on soil surface of paddy field and the like - Google Patents

Abstract

The utility model provides an evapotranspiration measuring system used for the environment with shallow water accumulation on the soil surface of paddy fields and the like, which comprises an evapotranspiration barrel buried in the soil and provided with an upward opening, a water supplementing device used for supplementing water into the evapotranspiration barrel, a rain gauge used for measuring the precipitation, a water depth collecting device, a data collector, a wireless transmission module and a data processing terminal; the evapotranspiration barrel is filled with a soil layer and a shallow water layer and is used for simulating the surrounding environment; the water supplementing device comprises a flowmeter for measuring the amount of supplemented water; the water depth acquisition device is arranged in the evapotranspiration barrel and is used for measuring the water level in the evapotranspiration barrel; the water depth acquisition device, the flowmeter and the rain gauge are respectively in communication connection with the data acquisition unit, and the data acquisition unit sends acquired data to the data processing terminal through the wireless transmission module. The method is low in cost, is suitable for evapotranspiration determination of different soil surface environments with shallow water accumulation, and can accurately and automatically acquire the evapotranspiration amount of the soil surface environment with shallow water accumulation in real time.

Description

Evapotranspiration determination system for shallow water accumulation environment on soil surface of paddy field and the like

Technical Field

The utility model relates to a meteorological hydrology measures technical field, especially relates to a evapotranspiration survey system that is used for soil surface such as paddy field to have shallow ponding environment.

Background

The evapotranspiration is the total flux of water vapor conveyed to the atmosphere by the vegetation and the whole ground, and is an important component part of energy balance and water circulation, and the evapotranspiration not only influences the growth, development and yield of the vegetation, but also influences the atmospheric circulation and plays a role in regulating the climate. At present, the existing means is mostly obtained by field sampling indoor test or calculation through an existing empirical formula, and the test cost is high in relation to the problem of measuring the environment evapotranspiration of the soil surface with shallow water accumulation, such as the problem of measuring the environment evapotranspiration of a paddy field; and because the sizes of fields, water depths and the like of different paddy field environments are complex, the microclimate conditions of paddy fields in different periods are different, the corresponding water dynamic evolution rules are different, and the existing evapotranspiration measuring means cannot accurately reflect the evapotranspiration amount of different paddy field environments in different periods.

With the development of science and technology, the intelligent system is more and more widely applied to modern agriculture. Through the production terminal equipment using various automatic, intelligent and remote control modes, real-time, quantitative and accurate agriculture management is realized, the agricultural production efficiency can be improved, the agricultural production is promoted to gradually turn to the production mode taking information and software as the center from the production mode taking manpower as the center and relying on machinery, the development of modern agriculture is promoted, the quality safety of agricultural products is guaranteed, and the agricultural production is more precise and automatic.

Therefore, an evapotranspiration measuring system which is low in cost and can automatically obtain the evapotranspiration amount of the shallow water accumulation environment on the surface of different soil in real time is needed.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to solve the above problem of the prior art, the utility model provides a evapotranspiration survey system that is used for soil surface such as paddy field to have shallow ponding environment, it is with low costs, be applicable to the evapotranspiration survey that has shallow ponding environment to the soil surface of difference to can obtain in real time, accurately, automatically that soil surface has the evapotranspiration volume of shallow ponding environment.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

the utility model provides an evapotranspiration measuring system used for the environment with shallow water accumulation on the soil surface of paddy fields and the like, which comprises an evapotranspiration barrel buried in the soil and provided with an upward opening, a water supplementing device used for supplementing water into the evapotranspiration barrel, a rain gauge used for measuring the precipitation, a water depth collecting device, a data collector, a wireless transmission module and a data processing terminal;

the evapotranspiration barrel is filled with a soil layer and a shallow water layer and is used for simulating the surrounding environment;

the water supplementing device comprises a flowmeter for measuring the amount of supplemented water;

the water depth acquisition device is arranged in the evapotranspiration barrel and is used for measuring the water level in the evapotranspiration barrel;

the water depth acquisition device is in communication connection with the data acquisition unit, the flowmeter is in communication connection with the data acquisition unit, and the rain gauge is in communication connection with the data acquisition unit;

and the data acquisition unit transmits the acquired data to the data processing terminal through the wireless transmission module.

Optionally, the transpiration bucket is square, sized to the determined terrain environment for transpiration and the depth of the root system of vegetation in that environment.

Optionally, the water replenishing device further comprises a first water replenishing pipe, a second water replenishing pipe and an electromagnetic valve; the water inlet end of the first water replenishing pipe is communicated with a water source, the water outlet end of the first water replenishing pipe is communicated with the water inlet end of the second water replenishing pipe through an electromagnetic valve, and the water outlet end of the second water replenishing pipe is arranged above the evapotranspiration barrel; the flowmeter is arranged on the second water replenishing pipe.

Optionally, the rain gauge is a skip bucket rain gauge.

Optionally, the rain gauge is disposed outside of the evapotranspiration bucket, and the rain gauge is disposed above a highest canopy height of vegetation in the evapotranspiration assay environment.

Optionally, the rain gauge is arranged 30-100 cm away from the outer edge of the evapotranspiration barrel.

Optionally, the water depth acquisition device comprises a water depth sensor, an inner sleeve and an outer sleeve vertically arranged on the soil layer; the bottom of the outer sleeve is hermetically arranged, the top of the outer sleeve is arranged higher than the water layer, the inner sleeve is fixedly arranged in the outer sleeve, the bottom of the inner sleeve is hermetically arranged, the top of the inner sleeve is arranged higher than the water layer, and the water depth sensor is arranged in the inner sleeve; a coarse filtration water inlet unit is arranged at the position of the water layer of the outer sleeve, and the interior of the outer sleeve is communicated with the water layer through the coarse filtration water inlet unit; interior sleeve pipe includes first body and the second body that connects gradually from supreme down, and the second body is the microporous filter pipe, the water contact between second body and inside and outside sleeve pipe.

Optionally, the water depth collecting device further comprises a supporting block arranged in the outer sleeve, the bottom end of the supporting block is fixedly connected with the bottom of the outer sleeve, and the top end of the supporting block is fixedly connected with the bottom of the inner sleeve.

Optionally, the coarse-filtration water inlet unit comprises a water inlet hole and a filter screen, the water inlet hole is arranged at the middle upper part of the outer sleeve, and the filter screen is wrapped outside the water inlet hole.

Optionally, the inner sleeve further comprises a third pipe body, the third pipe body is connected with the second pipe body, the second pipe body is located below the water surface, and the middle part of the water column in the inner sleeve is located above the middle part of the water column.

(III) advantageous effects

The utility model has the advantages that:

1. the utility model provides an equipment that adopts among the evapotranspiration survey system is simple low-priced, with low costs, is applicable to the evapotranspiration survey that has shallow ponding environment to soil surface such as paddy field, wetland, aquatic planting and breed to can acquire in real time, accurately, automatically that soil surface has the evapotranspiration volume of shallow ponding environment.

2. The electromagnetic valve is arranged in the water replenishing pipe to control the opening and closing of the water replenishing, so that the automatic water replenishing is realized.

3. By means of the rough filtering water inlet unit and the microporous filtering pipe, two-stage filtering of water is achieved, cleanness of water in contact with the water depth sensor is guaranteed, and measuring accuracy of the water depth sensor is improved.

Drawings

The invention is described with the aid of the following figures:

FIG. 1 is a schematic structural diagram of an evapotranspiration measurement system for a paddy field environment according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a water replenishing device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a skip bucket rain gauge in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the water depth collecting device in the embodiment of the present invention;

fig. 5 is the installation schematic diagram of the water depth collection device in the evapotranspiration barrel in the embodiment of the utility model.

[ description of reference ]

1: a transpiration barrel;

2: a water replenishing device;

21: a flow meter; 22: a first water replenishing pipe; 23: an electromagnetic valve; 24: a second water replenishing pipe;

3: a rain gauge;

31: an outer cylinder; 32: a support pillar; 33: a base; 34: a support; 35: tipping; 36: a rain receiving funnel; 37: a reed switch;

4: a water depth collecting device;

41: a water depth sensor; 42: an inner sleeve; 421: a microporous filter tube; 43: an outer sleeve; 431: a water inlet hole; 432: a filter screen; 44: a support block; 45: an insect-proof cover;

5: a data acquisition unit;

6: a wireless transmission module;

7: and a data processing terminal.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

According to the principle of water balance of paddy field, the evapotranspiration of paddy field, namely E + T ═ delta W + P + I-R-D-H, wherein: e-paddy field evaporation capacity, T-vegetation transpiration capacity, delta W-paddy field water level variation, P-precipitation capacity, R-runoff capacity, I-irrigation capacity, D-seepage capacity and H-underground water rising capacity. For delta W, setting the evapotranspiration to be positive (delta W is more than or equal to 0), and setting a default value of 0 when the water level of the delta W paddy field rises (namely delta W is less than or equal to 0); since Δ W is mostly 0 in the precipitation stage, R (runoff) does not participate in the calculation in general; in addition, D (leakage) and H (groundwater rise) are ignored in the area where the groundwater level change is not large and the water retention of the paddy field is good. Therefore, the evapotranspiration in paddy field, i.e., E + T ═ Δ W + P + I.

Therefore, the utility model provides a evapotranspiration survey system that is used for soil surface such as paddy field to have shallow ponding environment, including bury underground in the ascending evapotranspiration bucket of soil internal opening 1, be used for to the moisturizing device 2 of the interior supplementary moisture of evapotranspiration bucket 1, be used for surveying the hyetometer 3, the depth of water collection system 4, data collection station 5, wireless transmission module 6 and data processing terminal 7 of rainfall. The evapotranspiration barrel 1 is filled with a soil layer and a shallow water layer and is used for simulating the surrounding environment; the water replenishing device 2 includes a flow meter 21 for measuring the amount of replenishing water; the water depth collecting device 4 is arranged in the evapotranspiration barrel 1 and is used for measuring the water level in the evapotranspiration barrel; the water depth acquisition device 4 is in communication connection with the data acquisition device 5, the flowmeter 21 is in communication connection with the data acquisition device 5, and the rain gauge 3 is in communication connection with the data acquisition device 5; the data acquisition unit 5 sends the acquired data to the data processing terminal 7 through the wireless transmission module 6.

The utility model provides an evapotranspiration measuring system, through the evapotranspiration bucket buried underground in soil to simulate the evapotranspiration measuring environment, through moisturizing device simulate the irrigation in the evapotranspiration measuring environment, and adopt the flowmeter to measure out the irrigation volume in real time, measure out the precipitation of evapotranspiration measuring environment through the rain gauge in real time, measure out the water level variation of evapotranspiration measuring environment through the depth of water collection system in real time; the water depth acquisition device, the flowmeter and the rain gauge are respectively in communication connection with the data acquisition unit and are used for acquiring data such as irrigation quantity, precipitation quantity, water level variation and the like in real time; the data acquisition unit sends acquired data (irrigation quantity, precipitation quantity and water level variation quantity) to the data processing terminal through the wireless transmission module, and the data processing terminal automatically processes the received data to obtain the evapotranspiration quantity in the environment in real time. It is visible, the utility model provides an equipment that adopts among the evapotranspiration survey system is simple low-priced, with low costs, is applicable to the evapotranspiration survey that has shallow ponding environment to the soil surface of difference to can obtain in real time, accurately, automatically that soil surface has the evapotranspiration volume of shallow ponding environment.

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The present invention provides an evapotranspiration measurement system for an environment with shallow water accumulation on a soil surface, which is described below with reference to the accompanying drawings.

The utility model provides a evapotranspiration measuring system for paddy field environment as shown in figure 1.

The system comprises an evaporation barrel 1 buried in soil and provided with an upward opening, a water supplementing device 2 used for supplementing water into the evaporation barrel 1, a rain gauge 3 used for measuring rainfall, a water depth acquisition device 4, a data acquisition device 5, a wireless transmission module 6 and a data processing terminal 7. The evapotranspiration barrel 1 is filled with a soil layer and a shallow water layer and is used for simulating the surrounding environment; the water replenishing device 2 includes a flow meter 21 for measuring the amount of replenishing water; the water depth collecting device 4 is arranged in the evapotranspiration barrel and is used for measuring the water level in the evapotranspiration barrel; the water depth acquisition device 4 is in communication connection with the data acquisition device 5, the flowmeter 21 is in communication connection with the data acquisition device 5, and the rain gauge 3 is in communication connection with the data acquisition device 5; the data acquisition unit 5 sends the acquired data to the data processing terminal 7 through the wireless transmission module 6.

Specifically, as an example, the soil layer and the water layer in the transpiration bucket 1 are kept consistent with the surrounding environment, that is, the soil layer in the transpiration bucket 1 is the same as the surrounding paddy field, the soil layer in the transpiration bucket 1 is flush with the soil layer of the surrounding paddy field, the water layer in the transpiration bucket 1 is the same as the surrounding paddy field, and the water layer in the transpiration bucket 1 is the same as the water level of the surrounding paddy field. Can simulate the paddy field environment more accurately, make the data of survey more valuable.

Specifically, as an example, the transpiration bucket 1 is square, and its size is customized according to the measured terrain environment of transpiration and the depth of the root system of vegetation in that environment. As an example, in the paddy field environment, the height of the transpiration barrel 1 is unified to 100cm, wherein the soil layer is about 80cm, so that the requirement of the root system for the growth of rice can be met, and the soil layer is flat and convenient for the free flow of the water layer.

Specifically, as an example, rice or other paddy field vegetation is planted in the evapotranspiration barrel 1 and arranged according to different row spacing; for example, 5 rows × 6 plants (row spacing 22cm × 18cm) can be planted in standard sizes (125cm × 125 cm).

Preferably, the evapotranspiration barrel 1 is formed by thermoplastic processing of a PVC material (the thickness d is more than or equal to 10mm) serving as a raw material, and the edge of the top of the evapotranspiration barrel 1 is provided with a handrail, so that the evapotranspiration barrel is convenient to install and use.

Preferably, the water replenishing device 2 further comprises a first water replenishing pipe 22, a second water replenishing pipe 24 and an electromagnetic valve 23; the water inlet end of the first water replenishing pipe 22 is communicated with a water source, the water outlet end of the first water replenishing pipe 22 is communicated with the water inlet end of the second water replenishing pipe 24 through an electromagnetic valve 23, and the water outlet end of the second water replenishing pipe 24 is arranged above the evapotranspiration barrel 1; the flow meter 21 is provided on the second water replenishing pipe as shown in fig. 2. Wherein, the water source can be a water tower or an irrigation canal. The opening and closing of the water supplement are controlled through the electromagnetic valve, so that the automatic water supplement is realized, the water supplement amount is recorded by means of the flowmeter, and the automatic recording of the water amount is realized.

Preferably, the rain gauge 3 is a dump-bucket rain gauge.

The utility model provides a tipping bucket rain gauge as shown in figure 3.

The skip bucket type rain gauge comprises an outer cylinder 31, a support column 32, a base 33, a skip bucket 35, a rain receiving funnel 36 and a reed pipe 37. The bottom of the outer cylinder 31 is fixedly arranged on the support column 32; the base 33 is arranged inside the outer barrel 31, and the bottom end of the base 33 is fixedly connected with the bottom of the outer barrel 31; a bracket 34 is arranged at the upper end of the base 33, the dump bucket 35 is rotatably connected to the bracket 34, and the opening of the dump bucket 35 is arranged upwards; a rain receiving funnel 36 is installed at the top of the outer cylinder 31, and the water outlet of the rain receiving funnel 36 is arranged towards the opening of the dump bucket 35; the reed switch 37 is provided on the base 33 and located on one side of the dump body 35, and records the turning operation of the dump body. Each overturning action of the tipping bucket is converted into a pulse signal (1 pulse is 0.2mm) through a reed switch and transmitted to the data acquisition unit 5.

Further preferably, the rain gauge 3 is disposed outside the transpiration bucket 1, and the rain gauge 3 is disposed higher than the highest canopy height of vegetation in the transpiration assay environment.

Further preferably, the rain gauge 3 is arranged 30-100 cm away from the outer edge of the transpiration tub 1.

Further preferably, two rain gauges are provided outside the transpiration tub 1. The measuring precision is increased by averaging 2 rain gauges; if the 2 rain gauge measurement values are too different, alarming and giving a correction reference through a quality inspection alarming and correcting module arranged on the data processing terminal.

Preferably, as shown in fig. 4, the water depth collecting device 4 includes a water depth sensor 41, an inner casing 42 and an outer casing 43 vertically arranged on the soil layer, the bottom of the outer casing 43 is hermetically arranged, the top of the outer casing 43 is arranged higher than the water layer, the inner casing 42 is fixedly installed in the outer casing 43, the bottom of the inner casing 42 is hermetically arranged, the top of the inner casing 42 is arranged higher than the water layer, and the water depth sensor 41 is arranged in the inner casing 42; a coarse filtration water inlet unit is arranged at the position of the water layer of the outer sleeve 43 (the position on the outer sleeve corresponding to the water layer in the evapotranspiration barrel), and the interior of the outer sleeve 43 is communicated with the water layer through the coarse filtration water inlet unit; interior sleeve pipe 42 includes from the first body and the second body that supreme connected gradually down, and the second body is the millipore filtration pipe, and the water contact between second body and inside and outside sleeve pipe. The water in the evapotranspiration barrel firstly enters the outer sleeve through the rough filtering water inlet unit, so that primary filtering of the water is realized, the water after the primary filtering enters the inner sleeve through the microporous filtering pipe, secondary filtering of the water is realized, the cleanness of the water in contact with the water depth sensor is guaranteed, and the measuring precision of the water depth sensor is improved.

Further preferably, the first pipe body and the second pipe body are made of stainless steel materials. It is conceivable that the second tubular body is made of a polyvinyl chloride resin or a porous porcelain material to achieve a similar effect.

Optionally, the water depth collecting device may be disposed in the middle of the evapotranspiration barrel, as shown in fig. 5, or may be disposed at any one of four corners of the evapotranspiration barrel, so as to facilitate planting of rice or other paddy-field vegetation and installation and inspection of sensors.

As an example, the outer sleeve is a cylindrical PVC sleeve with a diameter of 20cm and a height of 90cm, and the inner sleeve is a sleeve with a diameter of 10cm and a height of 80 cm.

Further preferably, the microporous filter tube is positioned above the middle of the water column in the inner sleeve. As an example, the second tube is arranged 40-60cm from the bottom of the inner casing.

Further preferably, the water depth collecting device further comprises a supporting block 44 arranged in the outer sleeve 43, the bottom end of the supporting block 44 is fixedly connected with the bottom of the outer sleeve 43, and the top end of the supporting block 44 is fixedly connected with the bottom of the inner sleeve 42.

As an example, the supporting block 44 has a circular truncated cone shape with a height of 10 cm.

Further preferably, the coarse-filtered water inlet unit includes a water inlet hole 431 provided at an upper middle portion of the outer sleeve 43 and a filter screen 432, and the filter screen 432 is wrapped outside the water inlet hole 431. So as to ensure that common soil, weeds and sundries can not enter the inner part of the outer sleeve through the filter screen.

As an example, three square water inlet holes are arranged at a distance of 60-75cm from the top of the outer sleeve.

Further preferably, the water depth collecting device further comprises an insect-proof cover 45, and the insect-proof cover 45 is detachably arranged on the top of the outer sleeve 43. Further, a round hole is formed in the middle of the top of the insect-proof cover, the diameter of the round hole is 8-12 mm, so that an electric wire of the water depth sensor can pass through the round hole, and the round hole is provided with a soft plug pad to be possibly sealed. Further, the insect-proof cover is made of PVC material.

Further, the water depth sensor 41 is fixed to the bottom of the inner sleeve by a clip of the cable. The silt entering the inner sleeve is prevented from being attached to the water depth sensor, so that the induction and the sensitivity of the water depth sensor are prevented from being influenced.

Preferably, the data collector 5 reserves multiple communications to meet the requirements of more than 4 water level sensors, more than 2 rain gauges and flow meters for extended communications.

It should be noted that, the utility model provides an evapotranspiration survey system not only is applicable to the evapotranspiration survey of paddy field environment, still is applicable to the evapotranspiration survey that other soil surface such as wetland, aquatic plants and breed have shallow ponding environment. The utility model provides an evapotranspiration survey device, mountable multiunit evapotranspiration bucket, and the evapotranspiration bucket can set up to the size of different rules to satisfy the requirement that different soil surface of simulation has shallow ponding environment.

It should be understood that the above description of the embodiments of the present invention is only for illustrating the technical lines and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, but the present invention is not limited to the above specific embodiments. All changes and modifications that come within the scope of the claims are to be embraced within their scope.

Claims (9)

1. An evapotranspiration determination system for a soil surface with shallow water accumulation environment such as paddy field and the like is characterized by comprising an evapotranspiration barrel (1) buried in soil and provided with an upward opening, a water supplementing device (2) used for supplementing water into the evapotranspiration barrel (1), a rain gauge (3) used for determining rainfall, a water depth acquisition device (4), a data acquisition device (5), a wireless transmission module (6) and a data processing terminal (7);

the evapotranspiration barrel (1) is filled with a soil layer and a shallow water layer and is used for simulating the surrounding environment;

the water replenishing device (2) comprises a flow meter (21) for measuring the amount of the replenished water;

the water depth acquisition device (4) is arranged in the evapotranspiration barrel (1) and is used for measuring the water level in the evapotranspiration barrel;

the water depth acquisition device (4) is in communication connection with the data acquisition unit (5), the flowmeter (21) is in communication connection with the data acquisition unit (5), and the rain gauge (3) is in communication connection with the data acquisition unit (5);

the data acquisition unit (5) sends the acquired data to the data processing terminal (7) through the wireless transmission module (6);

the water replenishing device (2) also comprises a first water replenishing pipe (22), a second water replenishing pipe (24) and an electromagnetic valve (23);

the water inlet end of the first water replenishing pipe (22) is communicated with a water source, the water outlet end of the first water replenishing pipe (22) is communicated with the water inlet end of the second water replenishing pipe (24) through an electromagnetic valve (23), and the water outlet end of the second water replenishing pipe (24) is arranged above the evapotranspiration barrel (1);

the flowmeter (21) is arranged on the second water replenishing pipe (24).

2. The evapotranspiration measuring system according to claim 1, wherein the evapotranspiration bucket (1) is square and is sized according to the topographic environment of the evapotranspiration measurement and the depth of the root system of vegetation in that environment.

3. The evapotranspiration measuring system according to claim 1, wherein the rain gauge (3) is a dump-bucket rain gauge.

4. The evapotranspiration measuring system according to claim 1 or 3, wherein the rain gauge (3) is provided outside the evapotranspiration bucket (1), and the rain gauge (3) is provided above the highest canopy height of vegetation in the evapotranspiration measuring environment.

5. The evapotranspiration measurement system according to claim 4, wherein the rain gauge (3) is disposed 30 to 100cm from the outer edge of the evapotranspiration barrel (1).

6. The evapotranspiration measuring system according to claim 1, wherein the water depth collecting means (4) includes a water depth sensor (41), an inner casing (42), and an outer casing (43) vertically provided to the soil layer;

the bottom of the outer sleeve (43) is hermetically arranged, the top of the outer sleeve (43) is arranged higher than a water layer, the inner sleeve (42) is fixedly arranged in the outer sleeve (43), the bottom of the inner sleeve (42) is hermetically arranged, the top of the inner sleeve (42) is arranged higher than the water layer, and the water depth sensor (41) is arranged in the inner sleeve (42);

a coarse filtration water inlet unit is arranged at the position of the water layer of the outer sleeve (43), and the interior of the outer sleeve (43) is communicated with the water layer through the coarse filtration water inlet unit;

interior sleeve pipe (42) are including following supreme first body and the second body that connects gradually, and the second body is the microporous filter pipe, and the second body contacts with the water between interior, outer sleeve pipe.

7. The evapotranspiration determination system according to claim 6, wherein the water depth collection device (4) further comprises a support block (44) disposed in the outer sleeve (43), the bottom end of the support block (44) is fixedly connected to the bottom of the outer sleeve (43), and the top end of the support block (44) is fixedly connected to the bottom of the inner sleeve (42).

8. The evapotranspiration measuring system according to claim 6, wherein the coarse-filtration water intake unit includes a water inlet hole (431) provided at an upper middle portion of the outer sleeve (43) and a filter screen (432), the filter screen (432) being wrapped around the outside of the water inlet hole (431).

9. The evapotranspiration measurement system of claim 6, wherein the inner sleeve (42) further includes a third tube connected to the second tube, the second tube being located below the water surface and above the middle of the water column within the inner sleeve.

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