A rice irrigation area irrigation amount simulation method and system

Abstract

The application discloses a rice irrigation area irrigation water quantity simulation method and system, and the method comprises the steps: based on DEM and digital canal system, taking the area controlled by the backbone channel and the drainage dry ditch as the standard of dividing the subunit, carrying out grid division on the subunit to obtain the sub-basin division result of the irrigation area; constructing a dynamic irrigation triggering mechanism of each irrigation sub-basin, and determining a multi-water source coordinated scheduling scheme of each irrigation sub-basin based on the sub-basin division result of the irrigation area; when irrigating each irrigation sub-basin according to the multi-water source coordinated scheduling scheme, calculating the canal system leakage quantity in each irrigation sub-basin, and determining a water quantity distribution scheme of the irrigation sub-basin according to the canal system leakage quantity. The method can quickly and accurately simulate the irrigation water quantity and runoff of the rice irrigation area, and provides a scientific basis for formulating agricultural management measures and screening water-saving high-yield technical modes.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rice irrigation area management, and particularly relates to a rice irrigation area irrigation water amount simulation method and system. BACKGROUND

[0002] Rice is an important irrigated crop in China, and plays an extremely important role in food security and water security in China.

[0003] Rice planting puts forward higher requirements for the allocation of water resources. Water resources in China are unevenly distributed, and rice planting areas are often concentrated in regions with relatively abundant water resources. However, with the influence of factors such as population growth, economic development and climate change, the contradiction between water supply and demand is becoming increasingly prominent. Reasonable allocation of water resources and protection of rice irrigation water have important significance for maintaining regional water security and ecological balance. As an important scientific tool for water resources management and water saving and emission reduction research, hydrological models play an irreplaceable role in the regulation of water resources at the basin scale. However, the hydrological system of the rice irrigation area has the characteristics of high nonlinearity, and its water cycle process is influenced by many factors. This complexity results in poor effect of hydrological models developed for natural basins when applied to irrigation water amount and hydrological process simulation in rice irrigation areas, which brings challenges to accurate evaluation of water saving effect in rice irrigation areas. Therefore, it is an urgent problem to develop a simulation system suitable for irrigation water amount and hydrological process simulation in rice irrigation areas. SUMMARY

[0004] The application provides a rice irrigation area irrigation water amount simulation method and system to solve at least one of the above technical problems.

[0005] In a first aspect, the application provides a rice irrigation area irrigation water amount simulation method, comprising:

[0006] Based on DEM and digital channel system, the region controlled by the backbone channel and the drainage main ditch is taken as the standard for dividing sub-units, and the sub-units are grid divided to obtain the sub-basin division result of the irrigation area;

[0007] A dynamic irrigation triggering mechanism of each irrigation sub-basin is constructed, and a multi-water source coordinated scheduling scheme of each irrigation sub-basin is determined based on the sub-basin division result of the irrigation area;

[0008] When each irrigation sub-basin is irrigated according to the multi-water source coordinated scheduling scheme, the channel seepage amount in each irrigation sub-basin is calculated, and a water distribution scheme of the each irrigation sub-basin is determined according to the channel seepage amount.

[0009] In a second aspect, the application provides a rice irrigation area irrigation water amount simulation system, comprising:

[0010] The dividing module is configured to divide a subunit based on DEM and a digital channel system, take an area controlled by a trunk channel and a drainage main ditch as a standard for dividing the subunit, and divide the subunit into a grid to obtain a sub-basin division result of the irrigation area.

[0011] The determining module is configured to construct a dynamic irrigation triggering mechanism for each sub-basin of the irrigation area, and determine a multi-water-source coordinated scheduling scheme for each sub-basin of the irrigation area based on the sub-basin division result of the irrigation area.

[0012] The calculating module is configured to calculate a channel system leakage amount in each irrigation sub-basin when irrigation is performed on each irrigation sub-basin according to the multi-water-source coordinated scheduling scheme, and determine a water distribution scheme for each irrigation sub-basin according to the channel system leakage amount.

[0013] In a third aspect, an electronic device is provided, which includes at least one processor, and a memory connected to the at least one processor in communication, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the steps of the method for simulating water irrigation quantity in a rice irrigation area according to any one of the embodiments of the present application.

[0014] In a fourth aspect, the present application further provides a computer readable storage medium having a computer program stored thereon, and the program instructions are executed by a processor to enable the processor to perform the steps of the method for simulating water irrigation quantity in a rice irrigation area according to any one of the embodiments of the present application.

[0015] The method and system for simulating water irrigation quantity in a rice irrigation area according to the present application divide a subunit based on DEM and a digital channel system, take an area controlled by a trunk channel and a drainage main ditch as a standard for dividing the subunit, and divide the subunit into a grid to obtain a sub-basin division result of the irrigation area, construct a dynamic irrigation triggering mechanism for each sub-basin of the irrigation area, and determine a multi-water-source coordinated scheduling scheme for each sub-basin of the irrigation area based on the sub-basin division result of the irrigation area, calculate a channel system leakage amount in each irrigation sub-basin when irrigation is performed on each irrigation sub-basin according to the multi-water-source coordinated scheduling scheme, and determine a water distribution scheme for each irrigation sub-basin according to the channel system leakage amount, which can quickly and accurately simulate water irrigation quantity and runoff in a rice irrigation area, and provide a scientific basis for formulating agricultural management measures and screening water-saving high-yield technical modes. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 A flow chart of a rice irrigation area irrigation amount simulation method provided by an embodiment of the present application is shown in

[0018] Figure 2 A structural block diagram of a rice irrigation area irrigation amount simulation system provided by an embodiment of the present application is shown in

[0019] Figure 3 A structural schematic diagram of an electronic device provided by an embodiment of the present application is shown in DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0021] Please refer to Figure 1 , which shows a flow chart of a rice irrigation area irrigation amount simulation method provided by the present application.

[0022] As shown in Figure 1 , the rice irrigation area irrigation amount simulation method specifically includes the following steps:

[0023] In step S101, based on DEM and digital canal system, a region controlled by a trunk channel and a drainage main ditch is taken as a standard for dividing a subunit, the subunit is grid-divided, and a sub-basin division result of the irrigation area is obtained.

[0024] In this step, based on DEM and digital canal system superposition, a region controlled by a trunk channel and a drainage main ditch is taken as a standard for dividing a subunit, and the subunit is grid-divided. For an artificial water delivery and distribution channel, the DEM is processed by referring to the principle of the elevation increment superposition algorithm. According to the spatial distribution of the natural river channel and the artificial drainage ditch network in the study area, the DEM is processed by using the “burn-in” algorithm to reflect the actual layout of the artificial channel, ditch and river network in the irrigation area.

[0025] In step S102, a dynamic irrigation triggering mechanism of each irrigation area sub-basin is constructed, and a multi-source coordinated scheduling scheme of each irrigation area sub-basin is determined based on the sub-basin division result of the irrigation area.

[0026] In this step, the expression of the dynamic irrigation triggering mechanism is:

[0027] ,

[0028] ,

[0029] ,

[0030] In the formula, is the lower limit water layer depth of rice field irrigation, is the percentage of lower limit water layer of soil saturation water content in rice field irrigation, is the soil saturation water content, is the irrigation amount, is the upper limit water layer depth of irrigation, is the current soil water content.

[0031] The expression of the multi-source coordinated scheduling scheme is:

[0032] ,

[0033] ,

[0034] ,

[0035] In the formula, is the actual irrigation amount of the external water source, is the external water source irrigation water demand of the irrigation sub-basin, is the water amount of the external water source entering the irrigation sub-basin and available for irrigation, is the percentage of the water amount available for irrigation in the total water amount of the external water source, is the total water amount of the external water source entering the irrigation sub-basin.

[0036] In step S103, when each irrigation sub-basin is irrigated according to the multi-source coordinated scheduling scheme, the canal system seepage amount in each irrigation sub-basin is calculated, and a water amount allocation scheme of the each irrigation sub-basin is determined according to the canal system seepage amount.

[0037] In this step, the expression for calculating the canal system seepage amount is:

[0038] ,

[0039] ,

[0040] In the formula, is the canal system seepage amount, is the gross irrigation water amount of the irrigation sub-basin, is the water use coefficient of the water delivery canal system, is the water use coefficient of the water distribution canal system, is the area threshold value, is the area of the irrigation sub-basin.

[0041] It should be noted that determining the water amount allocation scheme of the each irrigation sub-basin according to the canal system seepage amount comprises:

[0042] obtaining gross irrigation water quantity of each irrigation sub-basin;

[0043] judging the canal system type according to the area threshold A:

[0044] when the irrigation sub-basin area is greater than the area threshold A, calculating the canal system leakage according to the water use coefficient of the water delivery canal system and the water use coefficient of the water distribution canal system;

[0045] when the irrigation sub-basin area is not greater than the area threshold A, calculating the canal system leakage only according to the water use coefficient of the water distribution canal system;

[0046] deducting the calculated canal system leakage from the gross irrigation water quantity to obtain the net irrigation water quantity , wherein, is the canal system leakage, is the gross irrigation water quantity of the irrigation sub-basin;

[0047] according to the net irrigation water quantity of each irrigation sub-basin , combining the crop water requirement and the soil moisture content, dynamically adjusting the actual irrigation water quantity distribution of each irrigation sub-basin.

[0048] Further, according to the net irrigation water quantity of each irrigation sub-basin , combining the crop water requirement and the soil moisture content, dynamically adjusting the actual irrigation water quantity distribution of each irrigation sub-basin includes:

[0049] obtaining the basic hydrological parameters of each irrigation sub-basin and the real-time soil moisture content vol;

[0050] when the soil moisture content is lower than the lower limit water layer depth of paddy field irrigation, according to the preset distribution rule, the actual irrigation water quantity is dynamically distributed to obtain the current soil moisture content, and the distribution rule is:

[0051] according to the net irrigation water quantity and the preset crop growth stage adjustment coefficient , calculating the actual distribution water quantity , wherein, in the green-up period, the crop growth stage adjustment coefficient =1.2, in the tillering period, the crop growth stage adjustment coefficient =1.0, in the booting period, the crop growth stage adjustment coefficient =1.1, and in the maturation period, the crop growth stage adjustment coefficient =0.8;

[0052] the current soil moisture content=the soil moisture content at the last time + the crop evapotranspiration amount.

[0053] ​​​To sum up, the method of the application,

[0054] Please refer to Figure 2 which shows a structure block diagram of a rice irrigation area irrigation amount simulation system of the application.

[0055] As Figure 2 shown, the rice irrigation area irrigation amount simulation system 200 includes a division module 210, a determination module 220, and a calculation module 230.

[0056] The division module 210 is configured to perform grid division on the sub-units based on DEM and digital canal system, taking the area controlled by the backbone channel and the drainage main ditch as the standard of the division sub-unit, to obtain the irrigation area sub-basin division result; the determination module 220 is configured to construct a dynamic irrigation triggering mechanism of each irrigation area sub-basin, and determine a multi-water source collaborative scheduling scheme of each irrigation area sub-basin based on the irrigation area sub-basin division result; and the calculation module 230 is configured to calculate the canal system seepage amount in each irrigation sub-basin when irrigating each irrigation sub-basin according to the multi-water source collaborative scheduling scheme, and determine a water distribution scheme of the each irrigation sub-basin according to the canal system seepage amount.

[0057] It should be understood that Figure 2 the modules described in the above detailed description correspond to each step in the method described with reference to Figure 1 . Therefore, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in Figure 2 , and will not be described here again.

[0058] In some other embodiments, the application also provides a computer readable storage medium having a computer program stored thereon, and the program instructions are executed by a processor to make the processor execute the rice irrigation area irrigation amount simulation method in any of the above method embodiments.

[0059] As an implementation form, the computer readable storage medium of the application stores computer executable instructions, and the computer executable instructions are configured to:

[0060] perform grid division on the sub-units based on DEM and digital canal system, taking the area controlled by the backbone channel and the drainage main ditch as the standard of the division sub-unit, to obtain the irrigation area sub-basin division result;

[0061] construct a dynamic irrigation triggering mechanism of each irrigation area sub-basin, and determine a multi-water source collaborative scheduling scheme of each irrigation area sub-basin based on the irrigation area sub-basin division result;

[0062] When each irrigation sub-basin is irrigated according to the multi-water-source coordinated scheduling scheme, canal system leakage in each irrigation sub-basin is calculated, and a water distribution scheme of the each irrigation sub-basin is determined according to the canal system leakage.

[0063] The computer readable storage medium can include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function; and the data storage area can store data created according to use of the rice irrigation area irrigation amount simulation system. In addition, the computer readable storage medium can include a high-speed random access memory, and can also include a memory such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some embodiments, the computer readable storage medium can optionally include a memory remotely arranged relative to the processor, and these remote memories can be connected to the rice irrigation area irrigation amount simulation system through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0064] Figure 3 is a structural schematic diagram of an electronic device provided by an embodiment of the present application, as shown in Figure 3 The device includes a processor 310 and a memory 320. The electronic device can also include an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330, and the output device 340 can be connected by a bus or other means, Figure 3 and are connected by a bus in this embodiment. The memory 320 is the computer readable storage medium described above. The processor 310 executes various function applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 320, that is, implements the rice irrigation area irrigation amount simulation method of the method embodiment described above. The input device 330 can receive input digital or character information, and generate key signal inputs related to user settings and function control of the rice irrigation area irrigation amount simulation system. The output device 340 can include a display device such as a display screen.

[0065] The electronic device described above can execute the method provided by the embodiment of the present application, and has the corresponding function modules and beneficial effects of executing the method. Technical details not described in detail in this embodiment can be referred to the method provided by the embodiment of the present application.

[0066] As an implementation manner, the electronic device described above is applied to the rice irrigation area irrigation amount simulation system, and is used for a client, and includes at least one processor, and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to:

[0067] Based on DEM and digital channel system, taking the area controlled by the main channel and drainage dry ditch as the standard of sub-unit division, the sub-unit is divided by grid to obtain the sub-basin division result of the irrigation district;

[0068] A dynamic irrigation triggering mechanism of each sub-basin of the irrigation district is constructed, and a multi-water source coordinated scheduling scheme of each sub-basin of the irrigation district is determined based on the sub-basin division result of the irrigation district.

[0069] When each irrigation sub-basin is irrigated according to the multi-water source coordinated scheduling scheme, the channel system leakage amount in each irrigation sub-basin is calculated, and a water distribution scheme of each irrigation sub-basin is determined according to the channel system leakage amount.

[0070] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and the necessary general hardware platform, and of course, it can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method of each embodiment or some parts of the embodiment.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of simulating water application amount in a rice irrigation area, characterized by, The method comprises the following steps: Based on DEM and digital channel system, taking the area controlled by the trunk channel and drainage ditch as the standard of sub-unit division, the sub-unit is divided by grid to obtain the sub-basin division result of the irrigation area; A dynamic irrigation triggering mechanism of each sub-basin of the irrigation area is constructed, and a multi-water source collaborative scheduling scheme of each sub-basin of the irrigation area is determined based on the sub-basin division result of the irrigation area, wherein the expression of the dynamic irrigation triggering mechanism is: ， ， ， wherein is the lower limit of the water layer depth for rice field irrigation, is the percentage of the lower limit of the water layer depth for rice field irrigation to the saturated water content of soil, is the saturated water content of soil, is the irrigation amount, is the upper limit of the water layer depth for rice field irrigation, is the current soil water content; When each irrigation sub-basin is irrigated according to the multi-water source collaborative scheduling scheme, the canal system leakage of each irrigation sub-basin is calculated, and a water distribution scheme of each irrigation sub-basin is determined according to the canal system leakage, wherein the expression of the multi-water source collaborative scheduling scheme is: ， ， ， wherein, is the actual irrigation amount of the external water source, is the irrigation water requirement of the sub-basin of the irrigation area from the external water source, is the water amount of the external water source entering the sub-basin of the irrigation area that can be used for irrigation, is the percentage of the water amount of the external water source that can be used for irrigation in the total water amount, is the total water amount of the external water source entering the sub-basin of the irrigation area. The expression for calculating the canal system leakage is: ， ， wherein, is the canal system leakage amount, is the gross irrigation water amount of the irrigation sub-basin, is the water delivery canal system water use coefficient, is the water distribution canal system water use coefficient, is the area threshold value, is the irrigation sub-basin area.

2. The water amount simulation method for a rice paddy field according to claim 1, characterized by, The water distribution scheme of each irrigation sub-basin determined according to the canal system leakage comprises: Obtaining the gross irrigation water of each irrigation sub-basin; Judging the canal system type according to the area threshold A: When the irrigation sub-basin area is greater than the area threshold A, the canal system leakage is calculated according to the water use coefficient of the water delivery canal system and the water use coefficient of the distribution canal system. When the irrigation sub-basin area is not greater than the area threshold A, the canal system leakage is calculated only according to the water use coefficient of the distribution canal system. Subtracting the calculated canal system seepage from the gross irrigation water volume, the net irrigation water volume is obtained wherein is the canal system seepage, is the gross irrigation water volume of the irrigation sub-basin; According to the net irrigation water quantity of each irrigation sub-basin , combined with crop water requirement and soil water content, the actual irrigation water quantity distribution of each irrigation sub-basin is dynamically adjusted.

3. The water amount simulation method for a rice paddy field according to claim 2, characterized by, The actual irrigation water amount of each irrigation sub-basin is dynamically adjusted according to the net irrigation water amount of each irrigation sub-basin , the crop water requirement and the soil water content, and the actual irrigation water amount distribution of each irrigation sub-basin is dynamically adjusted. Obtaining the basic hydrological parameters and the real-time soil water content vol of each irrigation sub-basin; When the soil water content is lower than the lower limit of the water layer depth of the paddy field irrigation, the actual irrigation water is dynamically distributed according to the preset distribution rule to obtain the current soil water content, and the distribution rule is: adjusting the crop growth stage adjustment coefficient calculating the actual distribution water amount wherein, at the green-up stage, the crop growth stage adjustment coefficient = 1.2, at the tillering stage, the crop growth stage adjustment coefficient = 1.0, at the booting stage, the crop growth stage adjustment coefficient = 1.1, and at the maturing stage, the crop growth stage adjustment coefficient = 0.

8. Current soil water content = previous time soil water content + Δt - Crop evapotranspiration.

4. A rice irrigation area irrigation volume simulation system, characterized in that, The method comprises the following steps: The division module is configured to divide the sub-unit by grid based on DEM and digital channel system, taking the area controlled by the trunk channel and drainage ditch as the standard of sub-unit division, to obtain the sub-basin division result of the irrigation area; The determination module is configured to construct a dynamic irrigation triggering mechanism of each sub-basin of the irrigation area, and determine a multi-water source collaborative scheduling scheme of each sub-basin of the irrigation area based on the sub-basin division result of the irrigation area, wherein the expression of the dynamic irrigation triggering mechanism is: ， ， ， wherein is the lower limit of the water layer depth for rice field irrigation, is the percentage of the lower limit of the water layer depth for rice field irrigation to the saturated water content of soil, is the saturated water content of soil, is the irrigation amount, is the upper limit of the water layer depth for rice field irrigation, is the current soil water content; The calculation module is configured to calculate the canal system leakage of each irrigation sub-basin when each irrigation sub-basin is irrigated according to the multi-water source collaborative scheduling scheme, and determine a water distribution scheme of each irrigation sub-basin according to the canal system leakage, wherein the expression of the multi-water source collaborative scheduling scheme is: ， ， ， wherein, is the actual water volume of the external water source, is the irrigation water demand of the sub-basin of the irrigation area from the external water source, is the water volume of the external water source entering the sub-basin of the irrigation area that can be used for irrigation, is the percentage of the total water volume of the external water source that can be used for irrigation, is the total water volume of the external water source entering the sub-basin of the irrigation area; The expression for calculating the canal system leakage is: ， ， wherein, is the canal system leakage, is the gross irrigation water quantity of the irrigation sub-basin, is the water use coefficient of the delivery canal system, is the water use coefficient of the distribution canal system, is the area threshold value, is the area of the irrigation sub-basin.

5. An electronic device, comprising: The program is executed by the processor to implement the method of any one of claims 1 to 3. The program is executed by the processor to implement the method of any one of claims 1 to 3.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, ​

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