An irrigation allocation method based on supply-demand process water two-way joint allocation

Abstract

The application discloses an irrigation allocation method based on supply-demand process water two-way joint allocation, belongs to the irrigation allocation technical field, and can solve the problem that the existing method cannot match the supply-demand process, and the irrigation allocation process is low in efficiency. The method comprises the following steps: S1, according to the correlation of a plurality of irrigation areas distributed along a river and the crop planting information of each irrigation area, the plurality of irrigation areas are divided into a plurality of irrigation area groups; S2, according to the crop planting information of all irrigation areas in each irrigation area group, the hourly water demand of each irrigation area group in the allocation period is determined; S3, according to the hourly water demand of each irrigation area group, the river loss conversion coefficient of the river section where each irrigation area group is located and the hourly discharge of the water source group located upstream of all irrigation area groups, an irrigation allocation model is constructed; S4, the irrigation target of each irrigation area group is determined, and based on the irrigation target, the irrigation scheme of the water source group to all irrigation area groups in the allocation period is determined by using the irrigation allocation model. The application is used for irrigation allocation.

Description

Technical Field

[0001] This invention relates to an irrigation allocation method based on the bidirectional joint allocation of water volume in the supply and demand process, belonging to the field of irrigation allocation technology. Background Technology

[0002] There are usually multiple irrigation districts along the river. To facilitate unified irrigation and management, several irrigation districts along the river are usually combined into an integrated irrigation system, and then irrigation is allocated based on the pre-calculated overall water demand of the irrigation system.

[0003] However, due to significant differences in crop types, planting structures, irrigated areas, and irrigation methods among various irrigation districts, and the fact that existing irrigation allocation methods only allocate water for the overall irrigation system while ignoring these differences between irrigation districts, it is difficult for existing methods to fully coordinate the irrigation needs of different districts. Furthermore, existing irrigation allocation methods allocate water based on pre-calculated water demand, failing to dynamically adjust allocation methods according to real-time changes in water demand in different irrigation districts. This results in a mismatch between the water supply process and the water demand process of each irrigation district in both time and space, leading to low overall efficiency in the irrigation allocation process. Summary of the Invention

[0004] This invention provides an irrigation allocation method based on the bidirectional joint allocation of water volume in the supply and demand process, which can solve the problem that existing methods cannot match the water supply process of the water source with the water demand process of each irrigation area, resulting in low overall efficiency of the irrigation allocation process.

[0005] This invention provides an irrigation allocation method based on bidirectional joint allocation of water volume during the supply and demand process, the method comprising:

[0006] S1. Based on the relationship between multiple irrigation districts distributed along the river and the crop planting information of each irrigation district, the multiple irrigation districts are divided into multiple irrigation district groups;

[0007] S2. Determine the water demand of each irrigation district group during the allocation period based on the crop planting information of all irrigation districts in each irrigation district group;

[0008] S3. Construct an irrigation allocation model based on the time-period water demand of each irrigation district group, the river loss conversion factor of the river section where each irrigation district group is located, and the time-period downstream discharge of the water source group located upstream of all irrigation district groups.

[0009] S4. Determine the irrigation target for each irrigation district group, and based on the irrigation target, use the irrigation allocation model to determine the irrigation plan for all irrigation district groups by the water source group during the allocation period.

[0010] Optionally, S2 specifically includes:

[0011] S21, determining a time-periodic water requirement of each irrigation area in the scheduling period according to the crop planting information of each irrigation area;

[0012] S22, determining a time-periodic water requirement of each irrigation area group in the scheduling period according to the time-periodic water requirements of all irrigation areas in each irrigation area group.

[0013] Optionally, S22 specifically comprises:

[0014] accumulatively fitting the time-periodic water requirements of all irrigation areas in each irrigation area group to obtain the time-periodic water requirement of each irrigation area group in the scheduling period.

[0015] Optionally, S3 specifically comprises:

[0016] constructing a first objective function according to the time-periodic water release amount, the time-periodic water requirement of each irrigation area group and the river loss conversion coefficient of the river section where each irrigation area group is located, the first objective function being used to determine a time-periodic total water supply amount of the water source group to all irrigation area groups in the scheduling period;

[0017] constructing a second objective function according to the time-periodic total water supply amount, the time-periodic water requirement of each irrigation area group and the river loss conversion coefficient of the river section where each irrigation area group is located, the second objective function being used to determine a time-periodic water supply amount of the water source group to each irrigation area group in the scheduling period;

[0018] constructing a constraint condition according to the design parameters of each water source in the water source group, the constraint condition being used to constrain the scheduling process of the water source group; constructing the irrigation scheduling model based on the first objective function, the second objective function and the constraint condition.

[0019] Optionally, constructing the first objective function specifically comprises:

[0020] determining a time-periodic water requirement at a preset position between the water source group and the most upstream irrigation area group according to the time-periodic water requirement of each irrigation area group and the river loss conversion coefficient of the river section where each irrigation area group is located;

[0021] constructing the first objective function according to the time-periodic water requirement at the preset position and the time-periodic water release amount.

[0022] Optionally, determining the irrigation target of each irrigation area group in S4 specifically comprises:

[0023] S41, determining a time-periodic water supply amount of the water source group to each irrigation area group by using the irrigation scheduling model based on the time-periodic water release amount of the water source group and the time-periodic water requirement of each irrigation area group;

[0024] S42, determining an irrigation index of each irrigation area group according to the time- segmented water supply amount, and determining an irrigation index meeting a preset requirement of each irrigation area group as an irrigation target of the corresponding irrigation area group.

[0025] Optionally, in S4, an irrigation scheme of the water source group for all irrigation area groups in the deployment period is determined based on the irrigation target and the irrigation deployment model, and specifically includes:

[0026] adjusting the time- segmented water release amount and the time- segmented water demand amount according to the irrigation target;

[0027] determining the irrigation scheme of the water source group for all irrigation area groups in the deployment period by using the irrigation deployment model according to the adjusted time- segmented water release amount and the adjusted time- segmented water demand amount.

[0028] Optionally, before adjusting the time- segmented water release amount and the time- segmented water demand amount, the method further includes:

[0029] determining a rigid water demand period, an elastic water demand period and a regular water demand period of each irrigation area group according to a growth cycle of a key crop in each irrigation area group, and the urgency of water demand of the key crop in each irrigation area group in the rigid water demand period, the elastic water demand period and the regular water demand period of the irrigation area group decreases in turn.

[0030] Optionally, adjusting the time- segmented water release amount and the time- segmented water demand amount according to the irrigation target specifically includes:

[0031] S43, if the irrigation index of any irrigation area group does not meet the irrigation target, increasing the time- segmented water release amount and repeating S41 and S42;

[0032] S44, after S43 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target, reducing the time- segmented water demand amount of the corresponding irrigation area in the regular water demand period thereof, and repeating S41 and S42;

[0033] S45, after S44 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target, reducing the time- segmented water demand amount of the corresponding irrigation area in the elastic water demand period thereof, and repeating S41 and S42;

[0034] S46, after S45 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target, sequentially and circularly executing S43 to S45, or sequentially and circularly executing S44 and S45, until the irrigation index of each irrigation area group meets the irrigation target.

[0035] Optionally, the irrigation index includes at least one of an irrigation water supply amount, an irrigation guarantee rate and an irrigation water supply safety degree.

[0036] The beneficial effects that can be produced by the present application include:

[0037] The present application classifies multiple irrigation districts into multiple irrigation district groups, and clearly defines the irrigation water demand process of each irrigation group, so as to facilitate fine irrigation allocation with the irrigation district group as a subdivision unit; the irrigation water demand process of each irrigation group, the irrigation water supply process of the water source group, and the river loss conversion coefficient of different river sections are combined and an irrigation allocation model is constructed, so as to accurately match the irrigation water supply process of the water source group and the irrigation water demand process of each irrigation district group in the time dimension and the space dimension; the irrigation index of each irrigation district group is obtained by running the irrigation allocation model, and the irrigation water supply process of the water source group and the irrigation water demand process of the irrigation district group are cyclically adjusted based on the irrigation index, so that the irrigation index meets the irrigation target, thereby realizing the two-way joint allocation of the supply-demand process water quantity; the rigid water demand period, the elastic water demand period and the regular water demand period of each irrigation district group are determined according to the growth cycle of the key crops, so as to facilitate the priority guarantee of the growth of the key crops when adjusting the irrigation water demand process of the irrigation district group, and meet the core irrigation demand of the irrigation district group. In this way, the irrigation water supply process of the water source group can be matched with the irrigation water demand process of all irrigation district groups, the differences in irrigation water supply demand of each irrigation district group can be taken into account, and the growth of key crops in each irrigation district group can be guaranteed, thereby improving the overall benefit of the irrigation allocation process. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A flowchart of the irrigation allocation method based on the two-way joint allocation of the supply-demand process water quantity is provided for the embodiments of the present application.

[0039] Figure 2 An irrigation district group division schematic diagram is provided for the embodiments of the present application.

[0040] Figure 3 A water demand process schematic diagram of the irrigation district group 1 is provided for the embodiments of the present application.

[0041] Figure 4 A water demand process schematic diagram of the irrigation district group 2 is provided for the embodiments of the present application.

[0042] Figure 5 A water demand process schematic diagram of the irrigation district group n is provided for the embodiments of the present application.

[0043] Figure 6 A water demand process schematic diagram of the irrigation system is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0044] The present application will be described in detail below in conjunction with the embodiments, but the present application is not limited to these embodiments.

[0045] The embodiments of the present application provide an irrigation allocation method based on the two-way joint allocation of the supply-demand process water quantity, as shown in Figure 1As shown, the method comprises:

[0046] S1, according to the correlation relationship of the multiple irrigation areas distributed along the river and the crop planting information of each irrigation area, the multiple irrigation areas are divided into multiple irrigation area groups.

[0047] The correlation relationship includes the spatial relationship and water force connection between the multiple irrigation areas; the crop planting information includes crop type, crop planting area, and crop irrigation mode, etc.

[0048] At present, the existing irrigation allocation method usually groups the multiple irrigation areas distributed along the river into an irrigation system as a whole, and then allocates irrigation according to the overall water demand process of the irrigation system. However, in practice, the irrigation areas in the irrigation system often have great differences in crop type, planting structure, irrigation area, irrigation mode, etc., which leads to the asynchronization of the water demand processes of the irrigation areas. For example, some crops have high water demand in spring and summer, while some crops have high water demand in summer and autumn. Moreover, the urgency of water demand of the same crop is different at different growth stages in its growth cycle, for example, the urgency of water demand of the crop is higher at the sensitive growth stages such as germination and seedling stages, and if the water demand is not fully met at this time, it may cause damage to the growth of the crop or even death due to water shortage; while the urgency of water demand of the crop is relatively low at the water consumption and yield increasing stages such as the plumping stage and the heading stage, and at this time, appropriately reducing the water supply to the crop may restrict the growth of the individual crop, but will not have a great impact on the yield of the crop. The existing irrigation allocation method only allocates irrigation for the whole irrigation system, ignoring the above differences of the irrigation areas and the asynchronization of the water demand processes of the irrigation areas, which leads to the fact that the irrigation demands of different irrigation areas cannot be effectively met.

[0049] To solve the above problems of the existing irrigation allocation method, the embodiment classifies and divides the multiple irrigation areas according to the correlation relationship of the multiple irrigation areas distributed along the river and the crop planting information of each irrigation area, and classifies the irrigation areas with similar crop types, similar water demand processes, same irrigation modes, or close spatial distances into an irrigation area group. The specific classification and division standard can be flexibly set according to the actual situation. By classifying and dividing the multiple irrigation areas, the complex irrigation system can be subdivided into multiple irrigation area groups, which is convenient for subsequent fine and differentiated irrigation allocation for the water demand processes of different irrigation area groups, so as to meet the irrigation demands of different irrigation area groups.

[0050] In practical application, the topological structure of the irrigation system can be constructed as shown in Figure 2 , and the spatial relationship and water force connection between the multiple irrigation areas are determined by using the topological structure, and then the multiple irrigation areas are classified and divided in combination with the crop planting information of each irrigation area to obtain the multiple irrigation area groups.

[0051] Further, in order to ensure the growth of the key crops in each irrigation area group during irrigation scheduling and avoid significant losses caused by the destruction of the key crops in the irrigation area group due to the growth of the key crops, the embodiment further determines the key crops in each irrigation area group according to the crop planting information of each irrigation area group, and determines other crops as general crops. The determination criteria of the key crops can be flexibly set according to actual conditions, such as taking the economic benefits, planting area, yield, and the like of the crops as the determination criteria.

[0052] Then, the rigid water demand period, the elastic water demand period, and the conventional water demand period of each irrigation area group are determined within the scheduling period according to the growth cycle of the key crops in each irrigation area group, as shown in FIG. 3. Figures 3 to 5

[0053] The rigid water demand period includes the sensitive growth stages such as the germination period and the seedling period of the key crops, and the urgency of water demand of the key crops in this stage is higher; the elastic water demand period includes the water consumption and yield increasing stages such as the stem-enclosing period and the heading period of the key crops, and the urgency of water demand of the key crops in this stage is relatively lower; the conventional water demand period includes the time period other than the rigid water demand period and the elastic water demand period within the scheduling period, and the urgency of water demand of the key crops in this stage is the lowest, and the water supply in this stage mainly meets the growth of the general crops in the irrigation area group. That is, the urgency of water demand of the key crops in each irrigation area group in the rigid water demand period, the elastic water demand period, and the conventional water demand period of the irrigation area group is sequentially reduced.

[0054] S2, determining the hourly water demand of each irrigation area group within the scheduling period according to the crop planting information of all irrigation areas in each irrigation area group, specifically including:

[0055] S21, determining the hourly water demand of each irrigation area within the scheduling period according to the crop planting information of the irrigation area. Generally, each irrigation area only plants one kind of crop, and the hourly water demand of the irrigation area, i.e., the water demand process of the irrigation area, can be determined according to the growth cycle, variety characteristics, planting area, irrigation mode, and the like of the crop. In practice, the hourly water demand can be determined by using the quota method.

[0056] S22, determining the hourly water demand of each irrigation area group within the scheduling period according to the hourly water demand of all irrigation areas in each irrigation area group.

[0057] The embodiment accumulates and fits the hourly water demand of all irrigation areas in each irrigation area group to obtain the hourly water demand of each irrigation area group within the scheduling period. That is, the accumulated water demand of each period is obtained by accumulating the water demand of all irrigation areas corresponding to the period, and the hourly water demand of each irrigation area group, i.e., the water demand process of each irrigation area group, is obtained by fitting the accumulated water demand of all periods, as shown in FIG. 3. Figures 3 to 5

[0058] ​​Similarly, by summing and fitting the time-period water demand of all irrigation districts, we can obtain the total time-period water demand of the irrigation system including all irrigation districts, that is, the water demand process of the irrigation system, such as... Figure 6 As shown. Figure 6 The rigid water demand period in the data is obtained by combining the rigid water demand periods of all irrigation district groups. Figure 6 The elastic water demand period in the figure is obtained by combining the elastic water demand periods of all irrigation district groups.

[0059] S3. Construct an irrigation allocation model based on the time-period water demand of each irrigation district group, the river loss conversion factor of the river section where each irrigation district group is located, and the time-period downstream discharge of the water source group located upstream of all irrigation district groups.

[0060] In this embodiment, the irrigation allocation model consists of three parts: a first objective function, a second objective function, and constraints. The construction process of each part is as follows:

[0061] 1. Construct the first objective function.

[0062] 1) Based on the time-period water demand of each irrigation district group and the river loss conversion factor of the river section where each irrigation district group is located, determine the time-period water demand at the preset position between the water source group and the upstream irrigation district group based on the water loss relationship.

[0063] The preset location can be the outlet of the water source group or the upstream location of the upstream irrigation area group.

[0064] The river loss conversion factor for a river segment is determined by the segment classification. Each segment classification corresponds to a different conversion factor, and the segment classification information and the conversion factor can be obtained from existing data on the river segment. For example... Figure 2 As shown, multiple irrigation districts are distributed downstream of the water source group. The river sections where these irrigation districts are located are divided into multiple levels. Starting from the river section where the upstream irrigation district is located, the river sections of each level can be labeled as 1, 2, ..., according to the downstream direction. Each river segment corresponds to a river loss reduction factor, with segments 1, 2, ..., The corresponding river loss conversion factors can be denoted as follows: , ,…, .

[0065] In this embodiment, the formula for calculating the water demand at the preset location for each time period is:

[0066] (1)

[0067] In formula (1), Indicates the preset position is Water demand during different time periods; Represents irrigation district group exist Water demand during different time periods; Indicates the total number of irrigation district groups; 1, 2, ..., These respectively indicate the river sections of various levels marked according to the direction of flow; , ,…, They represent river segments 1, 2, ..., The corresponding river loss conversion factor.

[0068] It is worth noting that there can be one or more irrigation district groups in each level of river section. Therefore, there is not a one-to-one correspondence between irrigation district groups and river loss conversion factors. When multiple irrigation district groups are distributed in the same level of river section, these multiple irrigation district groups correspond to the same river loss conversion factor.

[0069] Formula (1) shows that, based on the total water demand of the irrigation system for each time period, the river loss is calculated in reverse order to the upstream irrigation group, and the water demand for each time period at the preset location can be obtained.

[0070] 2) Construct a first objective function based on the water demand at the preset location and the water discharge volume of the water source group at each time period. The first objective function is used to determine the total water supply volume of the water source group to all irrigation districts during the allocation period.

[0071] The first objective function can be expressed as:

[0072] (2)

[0073] In formula (2), Indicates that the water source group is in The total water supply to all irrigation districts during the specified time period; Indicates the preset position is Water demand during different time periods; Indicates that the water source group is in The amount of water discharged during a given period.

[0074] According to formula (2) Pick and The minimum of the two.

[0075] in, For each water source in the water source group The sum of the discharge volume over the period is:

[0076] (3)

[0077] In formula (3), Indicates that the water source group is in The amount of water discharged during a given period; Indicates the water source in the water source group In the water yield of each time period; represents the total number of water sources in the water source group.

[0078] 2. Constructing a second objective function.

[0079] According to the hourly water supply, the hourly water demand of each irrigation group, and the river loss conversion coefficient of the river section where each irrigation group is located, a second objective function is constructed, which is used to determine the hourly water supply of the water source group to each irrigation group during the dispatch period.

[0080] The second objective function can be expressed as:

[0081] (4)

[0082] In formula (4), represents the water supply of the water source group to the irrigation group in the time period; represents the total water supply of the water source group to all irrigation groups in the time period; represents the water demand of the irrigation group in the time period; represents the total number of irrigation groups; 1,2,…, 1,2,…, respectively represent the river sections marked in the downstream direction; represents the river section where the irrigation group is located, =1,2,…, , ,…, respectively represent the river loss conversion coefficients of the river sections 1,2,…, .

[0083] Formula (4) shows that according to the hourly water supply of the water source group, the river loss is calculated in the downstream direction to the river section where a certain irrigation group is located, and the hourly water supply of the water source group to the irrigation group can be obtained.

[0084] 3. Constructing constraints.

[0085] According to the design parameters of each water source in the water source group, constraints are constructed, which are used to constrain the dispatch process of the water source group and ensure the normal operation of the water source group.

[0086] The constraints specifically include:

[0087] 1) Water balance constraint:

[0088] (5)

[0089] In formula (5), and respectively represent the storage capacity of the water source in the period and period; represent the inflow runoff of the water source in the period; represent the loss of water of the water source in the period, including evaporation loss and seepage loss; represent the outflow of the water source in the period; represent the water supplement of the water source to the water source in the period; represent the water supplement of the water source to the water source in the period; the water source is the upper water source of the water source and the water source .

[0090] According to formula (5), the water sources in the water source group can be connected with each other, facilitating joint irrigation allocation.

[0091] 2) Storage water amount constraint:

[0092] (6)

[0093] In formula (6), represent the water supplement of the water source to the water source in the period, the water source is the upper water source of the water source ; represent the storage water amount of the water source after the outflow is allocated in the period; represent the internal demand water amount of the water source after the outflow is allocated in the period.

[0094] 3) Storage water amount constraint:

[0095] (7)

[0096] In formula (7), indicates a water source in the storage capacity of the period; indicates the maximum storage capacity of a water source .

[0097] S4, determine the irrigation target of each irrigation area group, based on the irrigation target, determine the irrigation scheme of the water source group to all irrigation area groups within the deployment period by using the irrigation deployment model, specifically including:

[0098] S41, based on the hourly discharge of the water source group and the hourly water demand of each irrigation area group, determine the hourly water supply of the water source group to each irrigation area group by using the irrigation deployment model.

[0099] S42, determine the irrigation index of each irrigation area group according to the hourly water supply of the water source group to each irrigation area group, and determine the irrigation index that meets the preset requirements of each irrigation area group as the irrigation target of the corresponding irrigation area group. Wherein, the irrigation index includes at least one of irrigation water supply, irrigation guarantee rate and irrigation water supply safety degree, and the preset requirements can be flexibly set according to actual situation.

[0100] S43, if the irrigation index of any irrigation area group does not meet its irrigation target, increase the hourly discharge of the water source group and repeat S41 and S42.

[0101] S44, after executing S43, if the irrigation index of any irrigation area group still does not meet its irrigation target, reduce the hourly water demand of the corresponding irrigation area in its regular water demand period, and repeat S41 and S42.

[0102] S45, after executing S44, if the irrigation index of any irrigation area group still does not meet its irrigation target, reduce the hourly water demand of the corresponding irrigation area in its flexible water demand period, and repeat S41 and S42.

[0103] S46, after executing S45, if the irrigation index of any irrigation area group still does not meet its irrigation target, execute S43 to S45 in turn, or, when the hourly discharge of the water source group cannot be increased, execute S44 and S45 in turn, until the irrigation index of each irrigation area group meets its irrigation target. Finally, according to the adjusted hourly discharge and the adjusted hourly water demand, the storage capacity change, water level change and other deployment operation state information of each water source are obtained synchronously, and the irrigation scheme of the water source group to all irrigation area groups within the deployment period is determined by using the irrigation deployment model.

[0104] In summary, the embodiment takes the hourly discharge of the water source group as the decision variable, uses the irrigation allocation model to solve the irrigation allocation process, and iteratively optimizes the allocation process by cyclically adjusting the irrigation water supply process of the water source group and the irrigation water demand process of the irrigation district group, so as to meet the irrigation target and obtain the optimal irrigation scheme, thereby realizing the two-way joint allocation of the supply-demand process water.

[0105] The embodiment classifies and divides multiple irrigation districts into multiple irrigation district groups, and clearly defines the irrigation water demand process of each irrigation group, so as to facilitate the fine irrigation allocation taking the irrigation district group as the subdivision unit. The irrigation water demand process of each irrigation group, the irrigation water supply process of the water source group, and the river loss conversion coefficient of different river sections are combined and an irrigation allocation model is constructed, so as to accurately match the irrigation water supply process of the water source group and the irrigation water demand process of each irrigation district group in the time dimension and the space dimension. The irrigation allocation model is run to obtain the irrigation index of each irrigation district group, and the irrigation water supply process of the water source group and the irrigation water demand process of the irrigation district group are cyclically adjusted based on the irrigation index, so as to make the irrigation index meet the irrigation target, thereby realizing the two-way joint allocation of the supply-demand process water. The rigid water demand period, the elastic water demand period, and the regular water demand period of each irrigation district group are determined according to the growth cycle of the key crops, so as to facilitate the priority guarantee of the growth of the key crops when the irrigation water demand process of the irrigation district group is adjusted, and meet the core irrigation demand of the irrigation district group. In this way, the irrigation water supply process of the water source group can be matched with the irrigation water demand process of all irrigation district groups, the differences in irrigation water supply demand of each irrigation district group can be taken into account, and the growth of the key crops in each irrigation district group can be guaranteed, thereby improving the overall benefit of the irrigation allocation process.

[0106] The above is only a few embodiments of the present application, and does not limit the present application in any form. Although the above is disclosed in the preferred embodiment, it does not limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, which are equivalent to equivalent embodiments, and all belong to the scope of the technical solution.

Claims

1. An irrigation allocation method based on supply-demand process water quantity two-way joint allocation, characterized in that, The method comprises: S1, according to the correlation relationship of a plurality of irrigation districts distributed along the river and the crop planting information of each irrigation district, the plurality of irrigation districts are divided into a plurality of irrigation district groups; S2, according to the crop planting information of all irrigation districts in each irrigation district group, the hourly water demand of each irrigation district group in the deployment period is determined; S3, according to the hourly water demand of each irrigation district group, the river loss conversion coefficient of the river section where each irrigation district group is located, and the hourly discharge of the water source group located upstream of all irrigation district groups, an irrigation deployment model is constructed; S4, the irrigation target of each irrigation district group is determined, based on the irrigation target, the irrigation scheme of the water source group to all irrigation district groups in the deployment period is determined by using the irrigation deployment model; S3 specifically comprises: According to the hourly discharge, the hourly water demand of each irrigation district group and the river loss conversion coefficient of the river section where each irrigation district group is located, a first objective function is constructed, the first objective function is used to determine the total hourly water supply of the water source group to all irrigation district groups in the deployment period; According to the total hourly water supply, the hourly water demand of each irrigation district group and the river loss conversion coefficient of the river section where each irrigation district group is located, a second objective function is constructed, the second objective function is used to determine the hourly water supply of the water source group to each irrigation district group in the deployment period; According to the design parameters of each water source in the water source group, a constraint condition is constructed, the constraint condition is used to constrain the deployment process of the water source group; based on the first objective function, the second objective function and the constraint condition, the irrigation deployment model is constructed; Constructing the first objective function, specifically comprising: According to the hourly water demand of each irrigation district group and the river loss conversion coefficient of the river section where each irrigation district group is located, the hourly water demand at a predetermined position between the water source group and the uppermost irrigation district group is determined; According to the hourly water demand at the predetermined position and the hourly discharge, the first objective function is constructed.

2. The method of claim 1, wherein, S2 specifically comprises: S21, according to the crop planting information of each irrigation district, the hourly water demand of each irrigation district in the deployment period is determined; S22, according to the hourly water demand of all irrigation districts in each irrigation district group, the hourly water demand of each irrigation district group in the deployment period is determined.

3. The method of claim 1, wherein, S22 specifically comprises: The hourly water demand of all irrigation districts in each irrigation district group is accumulated and fitted to obtain the hourly water demand of each irrigation district group in the deployment period.

4. The method of claim 1, wherein, In S4, the irrigation target of each irrigation district group is determined, specifically comprising: S41, based on the hourly discharge of the water source group and the hourly water demand of each irrigation district group, the hourly water supply of the water source group to each irrigation district group is determined by using the irrigation deployment model; S42, according to the hourly water supply, the irrigation index of each irrigation district group is determined, and the irrigation index meeting the predetermined requirements of each irrigation district group is determined as the irrigation target of the corresponding irrigation district group.

5. The method of claim 4, wherein, In S4, based on the irrigation target, the irrigation scheme of the water source group to all irrigation district groups in the deployment period is determined by using the irrigation deployment model, specifically comprising: According to the irrigation target, the hourly discharge and the hourly water demand are adjusted; According to the adjusted time-periodical water discharge and the adjusted time-periodical water demand, the irrigation scheduling model is used to determine an irrigation scheme of the water source group to all irrigation area groups in the scheduling period.

6. The method of claim 5, wherein, Before adjusting the time-periodical water discharge and the time-periodical water demand, the method further comprises: According to a growth cycle of the key crop in each irrigation area group, a rigid water demand period, an elastic water demand period and a regular water demand period of each irrigation area group are determined in the scheduling period; the urgency of water demand of the key crop in each irrigation area group in the rigid water demand period, the elastic water demand period and the regular water demand period of the irrigation area group is in turn reduced.

7. The method of claim 6, wherein, According to the irrigation target, the time-periodical water discharge and the time-periodical water demand are adjusted, specifically comprising: S43, if the irrigation index of any irrigation area group does not meet the irrigation target of the irrigation area group, the time-periodical water discharge is increased, and S41 and S42 are repeatedly executed; S44, after S43 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target of the irrigation area group, the time-periodical water demand of the corresponding irrigation area in the regular water demand period is reduced, and S41 and S42 are repeatedly executed; S45, after S44 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target of the irrigation area group, the time-periodical water demand of the corresponding irrigation area in the elastic water demand period is reduced, and S41 and S42 are repeatedly executed; S46, after S45 is executed, if the irrigation index of any irrigation area group still does not meet the irrigation target of the irrigation area group, S43 to S45 are circularly executed in turn, or S44 and S45 are circularly executed in turn, until the irrigation index of each irrigation area group meets the irrigation target of the irrigation area group.

8. The method of claim 4, wherein, The irrigation index comprises at least one of irrigation water supply, irrigation guarantee rate and irrigation water supply safety degree.

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