Rice field runoff water monitoring device

Abstract

The present invention discloses a rice field runoff water monitoring device, comprising a flow collecting component, a drainage pipe, a water meter, a discharge component and a sample collection container, wherein the flow collecting component is arranged in a rice field and has a flow collecting port whose height can be continuously adjusted, a liquid discharge port is arranged on the side wall of the bottom area of ​​the flow collecting component, one end of the drainage pipe is connected to the liquid discharge port, and the other end is connected to the water inlet of the water meter, the water outlet of the water meter is connected to the discharge component, the discharge component comprises a water retaining bend, the water retaining height of the water retaining bend is higher than the water meter and lower than the flow collecting port, and the sample collection container is arranged below the discharge component and can collect the rice field runoff water discharged by the discharge component. The device has the advantages of small footprint, accurate runoff water measurement, and adjustable field water holding capacity.

Description

Technical Field

[0001] The invention relates to surface source pollution control, and in particular to a rice field runoff water monitoring device. Background Art

[0002] Agricultural non-point source pollution has become one of the main sources of water pollution. Fertilizer nutrients enter water bodies through leaching, surface runoff and other pathways, which is the main cause of non-point source pollution, among which surface runoff is the main pathway for nutrient loss.

[0003] Soil and water loss in farmland, agricultural non-point source pollution and nutrient loss in farmland are serious problems currently faced by agricultural production and agricultural ecological environment protection. Farmland surface runoff is the main carrier that affects the loss of pollutants and nutrients. Therefore, the study and monitoring of farmland runoff has always been an important research topic in the field of agricultural environmental protection. Surface runoff water monitoring device is an indispensable device in farmland research.

[0004] Rice needs to retain water holding capacity at different heights in different growth stages. For this reason, existing rice field runoff water monitoring devices mostly set up several water inlets at different heights in the rice field. Different water holding heights in the rice field are retained by opening different water inlets, which is not only cumbersome to operate, but can only maintain a limited number of water levels.

[0005] Most of the existing rice field runoff water monitoring devices set up runoff water collection pools on the surface near the experimental farmland to collect runoff water and detect the flow and composition of runoff water. Due to the uncertainty of rainfall, the duration and intensity of rainfall will affect the sediment content and pollutant concentration in the surface runoff. In order to collect all the surface runoff water, the existing runoff water collection pools usually need to be set up very large, which makes the runoff water monitoring device occupy a large area, destroys the original soil environment, and is time-consuming and labor-intensive. Natural rainfall will also fall directly into a large area of ​​runoff water collection pools, affecting the accuracy of runoff water monitoring data. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a rice runoff water monitoring device, which has continuously adjustable drainage height, small footprint and accurate runoff water measurement.

[0007] In order to solve the above technical problems, the present invention provides a rice field runoff water monitoring device, including a flow collecting component, a drainage pipe, a water meter, a discharge component and a sample collection container, the side of the flow collecting component has a flow collecting port whose height can be continuously adjusted, and the bottom area is provided with a drainage port, one end of the drainage pipe is connected to the drainage port, and the other end is connected to the water inlet of the water meter, the water outlet of the water meter is connected to the discharge component, the discharge component includes a water retention bend, the height of the water retention bend is higher than the water meter and lower than the flow collecting port, the sample collection container is arranged below the discharge component, and can collect the rice field runoff water discharged by the discharge component.

[0008] Preferably, the current collecting component includes a collecting tube, an adjusting cover and a waterproof sleeve, the side wall of the collecting tube is provided with the drainage port and at least one first collecting groove arranged obliquely, the adjusting cover is rotatably arranged outside the collecting tube, the upper end of the adjusting cover is sealed, the side wall is obliquely provided with at least one second collecting groove, and the inclination direction of the second collecting groove is opposite to the inclination direction of the first collecting groove, the intersection of the first collecting groove and the second collecting groove forms the collecting port, the waterproof sleeve is arranged between the collecting tube and the adjusting cover, and the waterproof sleeve is provided with a water flow groove consistent with the first collecting groove or the second collecting groove. Through this preferred technical solution, when the adjusting cover rotates relative to the collecting tube, the first collecting groove intersects with the second collecting groove at different heights, forming collecting ports of different heights. During the rotation of the adjusting cover, the intersection position of the first collecting groove and the second collecting groove is continuously variable, and the height of the formed collecting port is also continuously adjustable. The waterproof sleeve can prevent water from flowing between the collecting tube and the adjusting cover, causing water leakage.

[0009] Further preferably, the water blocking sleeve is fixed on the inner side of the regulating cover, and the position of the water trough overlaps with the second collecting trough; or, the water blocking sleeve is fixed on the outer side of the collecting tube, and the position of the water trough overlaps with the first collecting trough. Through this preferred technical solution, it can be ensured that the water trough and the second collecting trough or the first collecting trough are fixed in a mutually overlapping position, preventing the water blocking sleeve from blocking the collecting port.

[0010] Preferably, a filter screen is arranged outside the regulating cover. In this preferred technical solution, the filter screen can filter out debris in the paddy field runoff water, preventing the debris from entering the drainage pipe and the water meter, causing the drainage pipe or the water meter to be blocked.

[0011] As a preferred technical solution, the drainage port is set at 5-15 cm from the bottom of the collecting tube, and the height of the drainage port is lower than the mud surface of the rice field. In this preferred technical solution, the setting of the drainage port higher than the bottom of the collecting tube can allow the silt in the runoff water of the rice field to settle at the bottom of the collecting tube, preventing the silt from clogging the water meter. The setting of the drainage port lower than the mud surface of the rice field allows the water on the surface of the rice field to be discharged through the drainage port when necessary.

[0012] Preferably, the discharge component further includes a discharge pipe and a sample collection pipe, one end of the water retaining bend is connected to the water meter, and the other end is connected to the discharge pipe and the sample collection pipe, and the sample collection container is arranged at the outlet of the sample collection pipe. Through this preferred technical solution, the paddy field runoff water can be discharged through the discharge pipe after being measured by the water meter, and can be collected into the sample collection container through the sample collection pipe, so as to detect the components contained in the paddy field runoff water.

[0013] Further preferably, a solenoid valve is provided on the sample collection tube. Through this preferred technical solution, the solenoid valve can be controlled to collect water samples of paddy field runoff water at regular intervals, so that the collected water samples contain surface runoff water formed at different rainfall periods, and are therefore more representative.

[0014] Preferably, a counterweight is provided at the bottom of the sample collection container. In this preferred technical solution, the counterweight can improve the stability of the sample collection container and prevent the water flow from affecting the stability of the sample collection container when the amount of runoff water discharged from the paddy field is large, causing the position of the sample collection container to shift or the sample collection container to fall over.

[0015] In a preferred technical solution, the mouth of the collection container is provided with a container cover, and the sample collection tube is arranged through the container cover so that the outlet of the sample collection tube is located in the collection container. Through this preferred technical solution, the provision of the container cover can prevent rainfall from directly falling into the sample collection container during the sample collection process, and can prevent the evaporation of the sample during a long collection process.

[0016] Preferably, the flow collecting component is arranged on the inner side of the ridge at one end of the rice field, the drainage pipe is arranged through the ridge, and the water meter, the discharge component and the sample collection container are arranged in the drainage ditch outside the ridge. Through this preferred technical solution, the surface runoff water in the rice field can be conveniently collected and discharged outside the rice field after being measured by the water meter. It is also convenient for the discharge of the rice field runoff water and the arrangement of the water meter, the discharge component and the sample collection container.

[0017] Through the above technical scheme, the surface runoff water of different water levels in the rice field can be collected and discharged through the flow collecting component, and the discharge water level can be conveniently and continuously adjusted. The setting of the water meter realizes the measurement of the amount of runoff water discharged from the rice field in a simple way and at a low cost, with higher measurement accuracy, and omits the runoff water collection pool with a large floor space in the traditional runoff water monitoring device, reducing the occupation of land area. The setting of the water retaining bend ensures that the water meter is always full of water, prevents air from entering the water meter, and ensures the accuracy of the water meter measurement. The runoff water samples required for detection can be conveniently collected through the sample collection container to meet the needs of pollutant monitoring. The rice field runoff water monitoring device of the present invention has continuously adjustable drainage height, small floor space, low cost, and high measurement accuracy.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of a current collecting tube in one embodiment of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of a current collecting component in one embodiment of the present invention.

[0022] Description of Reference Numerals

[0023] DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, the term "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the following specific embodiments.

[0026] An implementation of the rice field runoff water monitoring device of the present invention is as follows Figure 1As shown, it includes a flow collecting component 1, a drainage pipe 2, a water meter 3, a discharge component 4 and a sample collection container 5. The sample collection container 5 is arranged at one end of the rice field 6, and is located in the rice field 6 on the inner side of the ridge 61. A sump 62 can also be arranged in the area near the ridge 61 in the rice field 6, and the flow collecting component 1 is arranged in the sump 62. A drainage port 112 is arranged on the side wall of the flow collecting component 1 near the bottom. When in use, the flow collecting component 1 can be installed in the sump 62 so that the drainage port 122 is lower than the surface of the field mud of the rice field 6, so as to be able to discharge water below the height of the surface of the field mud of the rice field 6. The side of the flow collecting component 1 has a flow collecting port 101 whose height can be continuously adjusted. The runoff water in the rice field 6 can be introduced into the flow collecting component 1 through the flow collecting port 101 and discharged through the drainage port 122. The drainage pipe 2 can use a metal pipe or a plastic pipe, preferably a PVC pipe with a diameter of 50 mm. One end of the drainage pipe 2 is connected to the drain port 112, and the other end is connected to the water inlet of the water meter 3, so that the runoff water in the flow collecting component 1 can be introduced into the water meter 3. The water meter 3 uses an ordinary tap water meter. The area of ​​the rice field 6 is 20-25m 2 A 40mm caliber tap water meter can be selected. The water meter 3 is arranged horizontally, and a support platform can be arranged below the water meter 3 to support the water meter 3 and improve the stability of the water meter 3. The outlet of the water meter 3 is connected to the discharge component 4 to discharge the runoff water measured by the water meter 3 through the discharge component 4. Since the discharged rice field runoff water has been measured by the water meter 3, there is no need to build a large runoff water collection pool to collect and measure the rice field runoff water like the existing rice field runoff water monitoring device, which greatly reduces the footprint of the rice field runoff water monitoring device and saves costs. The discharge component 4 is provided with a water retaining bend 42, which is an inverted "U"-shaped bend protruding upward. The height of the water retaining bend 42, that is, the height of the inner side of the lower wall of the highest part of the bend, is higher than the height of the water meter 3. In this way, only when the water level in the flow collecting component 1 is higher than the height of the water retaining bend 42, can it be discharged through the water retaining bend 42, ensuring that the water meter 3 is always full of water, thereby preventing air from entering the water meter and affecting the metering accuracy of the water meter 3. At the same time, the height of the water retaining bend 42 is lower than the lowest height that the flow collecting port 101 on the flow collecting component 1 can reach, so as to ensure that the rice field runoff water entering the flow collecting component 1 through the flow collecting port 101 can be discharged through the water retaining bend 42. The sample collection container 5 is arranged below the discharge component 4, and can be used to collect water samples of the rice field runoff water discharged by the discharge component 4 when necessary, and to detect the components in the rice field runoff water.

[0027] In some embodiments of the present invention, Figures 1 to 3As shown, the current collecting component 1 includes a collecting tube 11, an adjusting cover 12 and a waterproof sleeve 13. The collecting tube 11 can use a round plastic tube, or a round metal tube with a smooth surface and rust-proof treatment, preferably a PVC tube with a diameter of 200 mm. The collecting tube 11 is arranged vertically, with an open top, and the bottom can be a sealing structure with a bottom surface, or an open structure. The drain port 112 is arranged on the side wall of the collecting tube 11 near the bottom, and one to four obliquely arranged first collecting grooves 111 are arranged around the side wall of the upper part of the drain port 112. When there are more than two first collecting grooves 111, the shape, inclination and setting height of each first collecting groove 111 are the same, and they are arranged symmetrically on the side wall of the collecting tube 11 with intervals between each other. In the use state, the height of the lower end of the first collecting groove 111 is lower than the height of the mud surface layer of the rice field 6, so that the water on the mud surface layer of the rice field 6 can enter the collecting tube 11 through the first collecting groove 111. The adjusting cover 12 is a cylinder with a sealed upper end and a diameter slightly larger than that of the collecting barrel 11, and it can be made of metal or plastic material. The adjusting cover 12 is sleeved on the upper part of the first collecting trough 111 with its opening facing downward, and can rotate on the first collecting trough 111. The lower edge of the adjusting cover is higher than the height of the drain port 112, and lower than the height of the lower end of the first collecting trough 111. One to four second collecting troughs 121 are obliquely arranged around the side wall of the collecting barrel 11. The number of the second collecting troughs 121 is the same as that of the first collecting trough 111, and the inclination direction is opposite to that of the first collecting trough 111. For example, when the first collecting trough 111 is tilted counterclockwise from bottom to top, the second collecting trough 121 is tilted clockwise from bottom to top. When there are more than two second collecting grooves 121, the shape, inclination and setting height of each second collecting groove 121 are the same, and the range of each second collecting groove 121 on the circumference of the side wall of the adjustment cover 12 corresponds to the range of the first collecting groove 111 on the circumference of the side wall of the collecting barrel 11. When the adjustment cover 12 is sleeved on the collecting barrel 11, the first collecting groove 111 can intersect with the second collecting groove 121, and the intersection forms a collecting port 101. When there are more than two first collecting grooves 111 and second collecting grooves 121 on the collecting barrel 11 and the adjustment cover 12, respectively, each first collecting groove 111 intersects with the second collecting groove 121 at the corresponding position to form more than two collecting ports 101, and the height of each collecting port 101 is the same. When the adjustment cover 12 rotates on the manifold 11, the first manifold 111 and the second manifold 121 intersect at different heights to form manifold ports 101 at different heights, so that the height of the manifold port 101 can be continuously adjusted by rotating the adjustment cover 12. When the manifold 11 and the adjustment cover 12 have two or more first manifolds 111 and second manifolds 121, respectively, the two or more manifold ports 101 can be continuously adjusted, and in any rotation state of the adjustment cover 12, the heights of the manifold ports 101 are the same.A waterproof sleeve 13 is provided in the gap between the collecting tube 11 and the adjusting cover 12 to prevent water from flowing between the first collecting groove 111 and the second collecting groove 121 through the gap between the collecting tube 11 and the adjusting cover 12. The waterproof sleeve 13 is made of waterproof material, such as elastic plastic, rubber or silicone material. A water flow groove having the same shape as the first collecting groove 111 is provided at a position corresponding to the first collecting groove 111 on the waterproof sleeve 13, or a water flow groove having the same shape as the first collecting groove 111 is provided at a position corresponding to the second collecting groove 121 on the waterproof sleeve 13, so that the waterproof sleeve 13 does not form a blockage to the collecting port 101.

[0028] As a specific embodiment of the present invention, when the shape and position of the water groove on the water-blocking sleeve 13 are consistent with the second collecting groove 121, the water-blocking sleeve 13 is fixed to the inner wall of the adjusting cover 12. When the adjusting cover 12 rotates relative to the collecting barrel 11, the water-blocking sleeve 13 rotates relative to the collecting barrel 11 along with the adjusting cover 12. When the shape and position of the water groove on the water-blocking sleeve 13 are consistent with the first collecting groove 111, the water-blocking sleeve 13 is fixed to the outer wall of the collecting barrel 11. When the adjusting cover 12 rotates relative to the collecting barrel 11, the adjusting cover 12 also rotates relative to the water-blocking sleeve 13.

[0029] In some embodiments of the present invention, a filter screen (not shown in the figure) is provided on the outer cover of the adjustment cover 12. The filter screen can be a plastic screen or a metal screen of about 10 meshes. The filter screen can cover the entire outer side wall of the adjustment cover 12, or only cover the circumference corresponding to the second collecting groove 121. Of course, the filter screen can also only cover the position where the second collecting groove 121 is located. The filter screen can be fixed to the outer side wall of the adjustment cover 12, or can be detachably covered on the outer side wall of the adjustment cover 12.

[0030] In some embodiments of the present invention, Figures 1 to 3 As shown, the drain port 112 is set at 5-15 cm from the bottom of the collector 11. After the rice field runoff water enters the collector 11, the impurities in the surface runoff water will gradually form precipitation in the collector 11 and deposit at the bottom of the collector 11. The setting of the drain port 112 at a certain distance from the bottom of the collector 11 can prevent the sediment deposited at the bottom of the collector 11 from entering the drainage pipe 2 through the drain port 112, thereby causing the blockage of the water meter 3. When the distance between the drain port 112 and the bottom of the collector 11 is short, the sediment at the bottom of the collector 11 is easy to enter the drainage pipe 2, while the distance between the drain port 112 and the bottom of the collector 11 is long, and the amount of water retained at the bottom of the collector 11 is large, which affects the accuracy of the rice field runoff water metering. In use, the height of the drain port 112 is lower than the mud surface of the rice field 6, so that the runoff water in the rice field 6 can be discharged through the drain port 112.

[0031] In some embodiments of the present invention, Figure 1 As shown, the discharge component 4 also includes a discharge pipe 41 and a sample collection pipe 43. One end of the water retaining bend 42 is connected to the water meter 3, and the other end is connected to the discharge pipe 41 and the sample collection pipe 43. Specifically, the water retaining bend 42 can be connected to one interface of the tee 44, and the other two interfaces of the tee 44 are respectively connected to the discharge pipe 41 and the sample collection pipe 43. The rice field runoff water measured by the water meter 3 can be discharged through the discharge pipe 41; the sample of the rice field runoff water can be collected through the sample collection pipe 43 to detect the components of various pollutants in the rice field runoff water. The sample collection container 5 can be set at the outlet of the sample collection pipe 43, and part of the surface runoff water flowing out through the sample collection pipe 43 flows into the sample collection container 5 as a sample for pollutant detection. In order to improve the representativeness of the surface runoff water sample, a certain amount of samples can also be collected at different time periods of surface runoff water discharge, and the samples collected at different time periods can be mixed as samples for pollutant detection.

[0032] As a specific embodiment of the present invention, Figure 1 As shown, a solenoid valve 45 is provided on the sample collection tube 43. When the solenoid valve 45 is opened, a part of the rice field runoff water measured by the water meter 3 can flow into the sample collection container 5 through the sample collection tube 43. When the solenoid valve 45 is closed, the rice field runoff water measured by the water meter 3 cannot enter the sample collection tube 43 and can only be discharged through the discharge pipe 41. By controlling the input current of the solenoid valve 45, samples can be automatically collected at different time periods of the rice field runoff water discharge, and samples of the rice field runoff water can also be automatically collected periodically at different intervals.

[0033] In some embodiments of the present invention, Figure 1 As shown, a counterweight 51 is provided at the bottom of the sample collection container 5. The counterweight 51 can be provided inside the sample collection container or outside the sample collection container 5. The sample collection container 5 is usually provided in the discharge channel of the paddy field runoff water. The counterweight 51 can increase the stability of the sample collection container 5 and prevent the sample collection container 5 from deviating from its position or tipping over under the impact of the paddy field runoff water.

[0034] In some embodiments of the present invention, Figure 1As shown, the collection container 5 is also provided with a container cover 52, which covers the mouth of the collection container 5 and can shield the mouth of the collection container to prevent external impurities or rainwater from entering the collection container 5 and affecting the detection accuracy of the rice field runoff water sample. The container cover 52 can also be provided with a through hole, and the sample collection tube 43 passes through the through hole on the container cover 52 to enter the collection container 5, and the rice field runoff water directly flows into the collection container 5 through the outlet of the sample collection tube 43, so that the collected rice field runoff water sample is isolated from the outside.

[0035] As a specific embodiment of the present invention, Figure 1 As shown, a ridge 61 is arranged around the rice field 6, and the flow collecting component 1 is arranged on the inner side of the ridge 61 at one end of the rice field 6. A drainage ditch 7 is arranged on the outer side of the ridge 61, and the rice field runoff water discharged from the rice field 6 can be discharged through the drainage ditch 7. The drainage pipe 2 is arranged through the ridge 61, one end of the drainage pipe 2 is located in the rice field 6 and is connected to the drainage port 112 on the flow collecting component 1, and the other end is located in the drainage ditch 7 and is connected to the water inlet of the water meter 3. The water meter 3, the discharge component 4 and the sample collection container 5 are all arranged in the drainage ditch 7. In the drainage ditch 7, a support platform can also be arranged to support the water meter 3 to improve the stability of the water meter 3. Of course, a support platform can also be arranged in the drainage ditch 7 to support the corresponding part of the discharge component 4 to improve the structural stability of the discharge component 4. Below the sample collection tube 43, where the sample collection container 5 is located, a boss can also be arranged. In this way, the sample collection container 5 can be placed on the boss to avoid or reduce the impact of the water flow in the drainage ditch 7 on the sample collection container 5, thereby improving the stability of the sample collection container.

[0036] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "an implementation method", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A rice field runoff water monitoring device, characterized in that: The invention comprises a flow collecting component (1), a drainage pipe (2), a water meter (3), a discharge component (4) and a sample collection container (5); the side of the flow collecting component (1) is provided with a flow collecting port (101) whose height can be continuously adjusted; a drainage port (112) is arranged in the bottom area; one end of the drainage pipe (2) is connected to the drainage port (112) and the other end is connected to the water inlet of the water meter (3); the water outlet of the water meter (3) is connected to the discharge component (4); the discharge component (4) comprises a water retaining bend (42); the height of the water retaining bend (42) is higher than the water meter (3) and lower than the flow collecting port (101); the sample collection container (5) is arranged below the discharge component (4) and is capable of collecting rice field runoff water discharged by the discharge component (4); The current collecting component (1) comprises a current collecting tube (11), an adjusting cover (12) and a waterproof sleeve (13); the side wall of the current collecting tube (11) is provided with the drainage port (112) and at least one first current collecting groove (111) arranged obliquely; the adjusting cover (12) is rotatably arranged outside the current collecting tube (11); the upper end of the adjusting cover (12) is sealed; the side wall is provided with at least one second current collecting groove (121) obliquely; and the inclination direction of the second current collecting groove (121) is opposite to the inclination direction of the first current collecting groove (111); the intersection of the first current collecting groove (111) and the second current collecting groove (121) forms the current collecting port (101); the waterproof sleeve (13) is arranged between the current collecting tube (11) and the adjusting cover (12); and the waterproof sleeve (13) is provided with a water flow groove consistent with the first current collecting groove (111) or the second current collecting groove (121); The water-blocking sleeve (13) is fixed on the inner side of the regulating cover (12), and the position of the water-passing groove overlaps with the second collecting groove (121); or, The water-blocking sleeve (13) is fixed on the outside of the collecting tube (11), and the position of the water-passing groove overlaps with the first collecting groove (111); A filter screen is arranged on the outer side of the adjustment cover (12).

2. The paddy field runoff water monitoring device according to claim 1, characterized in that: The drainage port (112) is arranged at a distance of 5-15 cm from the bottom of the collecting tube (11), and the height of the drainage port (112) is lower than the mud surface layer of the rice field (6).

3. The paddy field runoff water monitoring device according to claim 1 or 2, characterized in that: The discharge component (4) further comprises a discharge pipe (41) and a sample collection pipe (43); one end of the water retaining bend (42) is connected to the water meter (3), and the other end is connected to the discharge pipe (41) and the sample collection pipe (43); the sample collection container (5) is arranged at the outlet of the sample collection pipe (43).

4. The paddy field runoff water monitoring device according to claim 3, characterized in that: The sample collection tube (43) is provided with a solenoid valve (45).

5. The paddy field runoff water monitoring device according to claim 1 or 2, characterized in that: A counterweight (51) is provided at the bottom of the sample collection container (5).

6. The paddy field runoff water monitoring device according to claim 3, characterized in that: The mouth of the sample collection container (5) is provided with a container cover (52), and the sample collection tube (43) is arranged through the container cover (52), so that the outlet of the sample collection tube (43) is located in the sample collection container (5).

7. The paddy field runoff water monitoring device according to claim 1 or 2, characterized in that: The flow collecting component (1) is arranged on the inner side of a ridge (61) at one end of the rice field (6), the drainage pipe (2) is arranged through the ridge (61), and the water meter (3), the discharge component (4) and the sample collection container (5) are arranged in a drainage ditch (7) outside the ridge (61).

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