A system for realizing water saving and reducing non-point source pollution of paddy field based on damming diving

Abstract

The application is a system for realizing water saving and reducing water field non-point source pollution based on intercepting and storing underground water, which is characterized by: the system is composed of underground water interception structure and underground water gate regulation structure, the underground water interception structure is located at the end of drainage channel and the downstream end of underground water flow direction, and is buried below the ground surface, used for intercepting and storing underground water, at least one underground water gate regulation structure is arranged in the underground water interception structure, the upper end of the underground water gate regulation structure is above the ground surface, which is beneficial to operation, the lower end of the underground water gate regulation structure is below the ground surface, the water inlet is communicated with the water outlet end of the underground water interception structure, the water outlet of the underground water gate regulation structure is communicated with the drainage channel, used for regulating underground water level and preventing secondary salinization. The system can form an underground barrier to effectively intercept and store the originally lost underground return water, so as to achieve the purpose of intercepting and discharging underground water, and improve the utilization rate of irrigation water.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural water-saving and non-point source pollution prevention and control, and is a system for realizing water-saving and reducing non-point source pollution in paddy fields based on blocking and storing phreatic water. BACKGROUND

[0002] Agricultural water is the largest water user in China, and paddy fields are the highest water consumption farmland in agricultural irrigation, with an average utilization rate of irrigation water of only about 50%. Therefore, it is of great importance and urgency to develop water-saving irrigation in paddy fields.

[0003] Current water-saving in paddy fields at home and abroad is basically limited to surface engineering, mainly focusing on seepage prevention of the canal system. By lining the irrigation channels at all levels, the purpose of reducing seepage of water conveyance channels and reducing water loss is achieved. At present, the irrigation channels in large and medium-sized irrigation areas in China have basically realized seepage prevention lining, and the water utilization rate of the canal system has been greatly improved. However, the water utilization rate in the field is still very low and difficult to improve, and a large amount of water is lost every year, of which the water loss through the fourth phreatic water method accounts for more than 70%. At the same time of water loss, the fertilizers applied in the farmland also flow into the drainage channel with the phreatic water without fully exerting their fertilizer efficiency, resulting in loss of fertilizers and non-point source pollution in the downstream receiving area. How to further utilize this part of water and reduce water loss and non-point source pollution is a problem that needs to be solved in future water-saving irrigation technology. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a system for realizing water-saving and reducing non-point source pollution in paddy fields based on blocking and storing phreatic water. By constructing a groundwater blocking and storing system and a groundwater gate regulating system, the originally lost groundwater is effectively blocked and utilized, and the irrigation water utilization rate is improved. At the same time, according to the changes of the water dynamic field and the water chemical field during irrigation period, the groundwater gate is closed or opened in time, and the groundwater level is regulated by the groundwater gate regulating system to reduce the possible salt and alkali capillary rise and avoid the occurrence of secondary salinization in paddy fields.

[0005] The technical problem of the present application is solved by a system for realizing water-saving and reducing non-point source pollution in paddy fields based on blocking and storing phreatic water, which is characterized by comprising a groundwater blocking structure and a groundwater gate regulating structure. The groundwater blocking structure is located at the end of the drainage channel and the downstream end of the groundwater flow direction, and is buried below the ground surface for intercepting and storing phreatic water. At least one groundwater gate regulating structure is arranged in the groundwater blocking structure. The upper end of the groundwater gate regulating structure is located above the ground surface for easy operation. The lower end of the groundwater gate regulating structure is located below the ground surface, and the water inlet of the groundwater gate regulating structure is connected with the water outlet of the groundwater blocking structure. The water outlet of the groundwater gate regulating structure is connected with the drainage channel for regulating the groundwater level and preventing secondary salinization.

[0006] The underground water storage structure comprises a water interception trench, a waterproof layer and an underground water collection pipe, the water interception trench is arranged at the end of the drainage channel and the downstream end of the underground water flow direction, the waterproof layer is arranged in the water interception trench below the ground surface, and the underground water collection pipe is arranged above the waterproof layer below the ground surface.

[0007] The waterproof layer of the underground water storage structure is a waterproof material, including but not limited to a geomembrane.

[0008] The material of the underground water collection pipe of the underground water storage structure includes but is not limited to plastic pipe materials such as PVC, PE and UPVC corrugated pipes, and needs to have a certain strength.

[0009] The underground water collection pipe of the underground water storage structure is wrapped with a filter layer outside the periphery, which is used for filtering the phreatic water and preventing the silt from entering the underground water collection pipe.

[0010] The filter layer of the underground water collection pipe of the underground water storage structure includes but is not limited to non-woven fabric.

[0011] The underground water gate regulating structure comprises a gate well, a drainage pipe and a water gate, the gate well is arranged at the underground water collection pipe of the underground water storage structure, the bottom of the gate well is below the underground water collection pipe, the top of the gate well is flush with the ground surface, the water outlet of the underground water collection pipe is communicated with the gate well, the drainage pipe is arranged between the gate well and the drainage channel and is buried below the ground surface, the water inlet of the drainage pipe is located in the gate well and is communicated, the water outlet of the drainage pipe is communicated with the drainage channel, the water gate is arranged in the gate well, the operating end of the water gate is located above the gate well, the water blocking end of the water gate is located at the water inlet of the drainage pipe, and the water blocking end of the water gate can block or open the water inlet of the drainage pipe.

[0012] The top of the gate well of the underground water gate regulating structure is provided with a well cover, and the inner wall of the gate well is provided with a water gate ladder.

[0013] The drainage pipe of the underground water gate regulating structure includes but is not limited to a reinforced concrete pipe, which needs to meet the strength requirement.

[0014] The principle of the present application is:

[0015] 1 The water interception trench and the waterproof layer of the underground water storage structure constitute an underground barrier to intercept the underground phreatic water.

[0016] 2 A porous underground water collection pipe is arranged on the upstream side of the waterproof layer along the water interception trench, which is used to collect the phreatic water and guide the phreatic water to the underground water gate regulating structures on both sides.

[0017] 3 According to the change of the hydrodynamic field and the hydrochemical field, the water gate of the underground water gate regulating structure is closed or opened in time to store or discharge the underground phreatic water, and the underground water level is controlled to prevent secondary salinization.

[0018] The beneficial effects of this invention are as follows: its groundwater interception structure can form an underground barrier to intercept groundwater, and through porous underground water collection pipes, it collects groundwater and guides it to the groundwater gate regulation structures on both sides, effectively intercepting and utilizing the groundwater that would otherwise be lost, thus achieving the purpose of intercepting or discharging groundwater and improving irrigation water utilization. Simultaneously, based on changes in the hydrodynamic and hydrochemical fields during the irrigation period, the groundwater gate regulation structure can be opened and closed in a timely manner to regulate the groundwater level, reduce potential capillary upwelling of salinity, and prevent secondary salinization of paddy fields.

[0019] It has the advantages of simple structure, reliable performance and significant effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 for Figure 1 Part I enlarged schematic diagram;

[0022] Figure 3 for Figure 1 A magnified schematic diagram of part II;

[0023] Figure 4 for Figure 1 A magnified schematic diagram of part III;

[0024] Figure 5 This is a cross-sectional schematic diagram of the present invention;

[0025] Figure 6 for Figure 5 A schematic diagram of the AA cross-section;

[0026] Figure 7 This is a standard cross-sectional view of the groundwater impoundment structure of the present invention.

[0027] In the diagram: 1. Underground water collection pipe, 2. Underground sluice gate regulating structure, 3. Drainage pipe, 4. Drainage channel, 5. Irrigation channel, 6. Farmland, 7. Gate well, 8. Ladder, 9. Manhole cover, 10. Sluice gate, 11. Water-blocking end, 12. Waterproof layer, 13. Water collection hole, 14. Non-woven fabric. Detailed Implementation

[0028] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0029] Referring to Figures 1-7 , Embodiment 1, the embodiment is a system for realizing water-saving and reducing water field non-point source pollution based on intercepting phreatic water, which is arranged at the side of an irrigation channel 5 of a farmland 6, the end of a drainage channel 4 and the downstream end of a groundwater flow direction, the farmland 6 is a paddy field, which is composed of a groundwater interception structure and a groundwater gate regulating structure 2, the groundwater interception structure is located at the end of the drainage channel 4 and the downstream end of the groundwater flow direction and is buried below the ground surface, used for intercepting and storing phreatic water, two groundwater gate regulating structures are arranged in the groundwater interception structure, the upper end of the groundwater gate regulating structure 2 is above the ground surface, facilitating operation, the lower end of the groundwater gate regulating structure 2 is below the ground surface and the water inlet is communicated with the water outlet end of the groundwater interception structure, the water outlet of the groundwater gate regulating structure 2 is communicated with the drainage channel 4, used for regulating the groundwater level and preventing secondary salinization.

[0030] The groundwater interception structure includes a water interception groove, a waterproof layer 12 and a groundwater collection pipe 1, the water interception groove is arranged at the end of the drainage channel 4 and the downstream end of the groundwater flow direction, the waterproof layer 12 is arranged below the ground surface in the water interception groove, the waterproof layer 12 is a geomembrane made of impermeable material, the groundwater collection pipe 1 is arranged below the ground surface and upstream of the waterproof layer 12, the groundwater collection pipe 1 is laid along the water interception groove and the upper pipe wall is provided with a water collection hole 13, used for absorbing phreatic water. The groundwater collection pipe 1 is a plastic pipe material with certain strength, non-woven fabric 14 is wrapped around the outer periphery of the groundwater collection pipe 1 as a filter layer, used for filtering phreatic water and preventing silt from entering the groundwater collection pipe 1.

[0031] The underground water gate regulating structure 2 comprises a gate well 7, a drain pipe 3 and a water gate 10, the gate well 7 is arranged at the underground collecting pipe 1 of the underground water storage structure, the bottom of the gate well 7 is below the underground collecting pipe 1 and the top is flush with the ground surface, the top of the gate well 7 of the underground water gate regulating structure 2 is provided with a well cover 9 and the inner wall is provided with a ladder 8. The water outlet hole of the underground collecting pipe 1 is communicated with the gate well 7, the drain pipe 3 is a reinforced concrete pipe meeting the strength requirement, the drain pipe 3 is arranged between the gate well 7 and the drain channel 4 and is buried below the ground surface, the water inlet of the drain pipe 3 is located in the gate well 7 and is communicated, the water outlet of the drain pipe 3 is communicated with the drain channel 4, the water gate 10 is arranged in the gate well 7, the operation end of the water gate 10 is located above the gate well 7 and the water blocking end 11 is located at the water inlet of the drain pipe 3, the water blocking end 11 of the water gate 10 can block or open the water inlet of the drain pipe 3.

[0032] The present embodiment is manufactured by using the prior art.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for saving water in paddy fields and reducing non-point source pollution in paddy fields based on water retention and storage, characterized by: It comprises a groundwater interception structure and a groundwater gate regulating structure, the groundwater interception structure is located at the end of the drainage channel and the downstream end of the groundwater flow direction, and is buried below the ground surface, used for intercepting and storing phreatic water, at least one groundwater gate regulating structure is arranged in the groundwater interception structure, the upper end of the groundwater gate regulating structure is above the ground surface, facilitating operation, the lower end of the groundwater gate regulating structure is below the ground surface, and the water inlet is communicated with the water outlet end of the groundwater interception structure, the water outlet of the groundwater gate regulating structure is communicated with the drainage channel, used for regulating the groundwater level and preventing secondary salinization; the groundwater interception structure comprises a water interception groove, a waterproof layer and a groundwater collection pipe, the water interception groove is arranged at the end of the drainage channel and the downstream end of the groundwater flow direction, the waterproof layer is arranged below the ground surface in the water interception groove, and the groundwater collection pipe is arranged below the ground surface and upstream of the waterproof layer, the groundwater collection pipe is arranged along the water interception groove, and the upper pipe wall is provided with a water collection hole for absorbing phreatic water, the groundwater gate regulating structure comprises a gate well, a drainage pipe and a water gate, the gate well is arranged at the groundwater collection pipe of the groundwater interception structure, the bottom of the gate well is below the groundwater collection pipe, and the top is flush with the ground surface, the water outlet hole of the groundwater collection pipe is communicated with the gate well, the drainage pipe is arranged between the gate well and the drainage channel and is buried below the ground surface, the water inlet of the drainage pipe is located in the gate well and is communicated, the water outlet of the drainage pipe is communicated with the drainage channel, and the water gate is arranged in the gate well, the operating end of the water gate is above the gate well, and the water blocking end is located at the water inlet of the drainage pipe, the water blocking end of the water gate can block or open the water inlet of the drainage pipe.

2. The system for water-saving and reducing non-point source pollution in paddy fields based on the damming of submersion according to claim 1, characterized in that: The waterproof layer is a waterproof material, which is a geomembrane.

3. The system for water-saving and reducing non-point source pollution in paddy fields based on the damming of diving according to claim 1, characterized in that: The material of the groundwater collection pipe is PVC, PE or UPVC corrugated plastic pipe.

4. The system for water-saving and non-point source pollution reduction in paddy fields based on the damming of submergence according to claim 1, characterized in that: The groundwater collection pipe is wrapped with a filter layer outside the periphery, used for filtering phreatic water and preventing silt from entering the groundwater collection pipe.

5. The system for water-saving and non-point source pollution reduction in paddy fields based on the damming of submergence according to claim 4, characterized in that: The filter layer is a non-woven fabric.

6. The system for water-saving and non-point source pollution reduction in paddy fields based on the damming of submersion according to claim 1, characterized in that: The top of the gate well is provided with a well lid, and the inner wall is provided with a water gate ladder.

7. The system for water-saving and non-point source pollution reduction in paddy fields based on the damming of submergence according to claim 1, characterized in that: The drainage pipe is a reinforced concrete pipe.

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