A method, apparatus and device for identifying an intermediate stable layer in soil water content

Abstract

The present application relates to the technical field of soil analysis, in particular to a method, device and equipment for identifying intermediate stable layer of soil moisture content, wherein the method is based on the original method for determining the intermediate stable layer of soil moisture content after the soil moisture content response time of the precipitation event, and the soil moisture content power spectrum density at different points of the profile is analyzed and monitored during the dry period, so that the intermediate stable layer of soil moisture content can be identified during the dry period, and the applicable conditions and climate conditions for identifying the intermediate stable layer of soil moisture content are expanded. On this basis, the original method is combined, the intersection of the two methods is taken, and the identification efficiency and accuracy of the intermediate stable layer of soil moisture content are increased.

Description

Technical Field

[0001] This invention relates to the field of soil analysis technology, and specifically to a method, apparatus, and equipment for identifying the intermediate stable layer of soil moisture content. Background Technology

[0002] During water transport in the vadose zone, the vertical velocity of water flux is often more than 100 times that of the horizontal velocity. Therefore, the horizontal velocity of water flux within the vadose zone is negligible. Studying the vertical transport characteristics of water flux within the vadose zone can reveal its transport patterns. Researchers have established soil monitoring profiles and placed monitoring instruments at different depths in the vertical direction of the vadose zone to investigate the variation patterns of soil moisture content, thereby determining the flow characteristics of soil water within the vadose zone and the coupling relationship between soil water and groundwater. Under normal conditions, after a precipitation event, as water gradually infiltrates downwards, the response time of soil moisture content to precipitation increases with depth. Under the influence of natural conditions such as surface evapotranspiration, the daily fluctuation amplitude of soil moisture content decreases with depth; this is the damping effect of the vadose zone. However, in areas with shallow groundwater, the proximity of groundwater to the surface causes significant fluctuations in the groundwater level in the thinner vadose zone, which in turn affects the groundwater level fluctuations in the surrounding area. These fluctuations, in turn, influence water transport within the vadose zone vertically upwards. Under these conditions, soil water within the vadose zone is affected by two driving mechanisms: the upper part is influenced by surface meteorological conditions, and the lower part is affected by groundwater level fluctuations. The combined effect of these two forces results in the weakest impact on soil water within the central part of the vadose zone, where soil moisture content fluctuations are minimal; this central layer represents the most stable soil moisture content layer.

[0003] Existing methods for identifying intermediate stable soil moisture layers rely on the response time of soil moisture content to rainfall events. Specifically, the response time is defined as the moment when the soil moisture content rises to 10% of its pre-rainfall level after a rainfall event. The difference between this response time and the rainfall event time yields the response time. The presence of an intermediate stable soil moisture layer is determined by whether the response time increases unidirectionally downwards along the soil profile. After identifying the presence of an intermediate stable soil moisture layer, its location is determined by the longest response time. However, variations in rainfall amount interfere with the identification results, making the current method inaccurate in practical applications. In arid and semi-arid regions with sparse rainfall, the limited number of rainfall events is insufficient to accurately identify the specific location of the intermediate stable soil moisture layer, or even determine its existence. Currently, there is no technical means to accurately identify the intermediate stable layer of soil moisture content under arid climate conditions, nor can we combine the daily fluctuation characteristics of soil moisture content with the response characteristics of soil moisture content to rainfall events for comprehensive analysis, so as to determine whether the intermediate stable layer of soil moisture content exists and to accurately determine the location of the intermediate stable layer of soil moisture content. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method, apparatus and device for identifying the intermediate stable layer of soil moisture content, so as to overcome the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this application provides a method for identifying intermediate stable layers of soil moisture content, comprising:

[0007] Obtain the measured data set of soil moisture content from the monitoring profile;

[0008] The measured dataset is preprocessed and divided according to meteorological conditions; wherein the divided measured dataset includes at least one of the measured dataset during the precipitation period and the measured dataset during the drought period.

[0009] Determine the intermediate stable layer of soil moisture content for all the divided measured datasets;

[0010] The intermediate stable layer of soil moisture content in the monitoring profile is determined based on the intermediate stable layer of soil moisture content in all the divided measured datasets.

[0011] Furthermore, in the above-described method, obtaining the measured soil moisture content dataset of the monitoring profile includes:

[0012] Identify at least three monitoring points for the aforementioned monitoring profile;

[0013] Obtain continuous time series samples of soil moisture content measured at each monitoring point; wherein, the time span of the measured dataset for each monitoring point is at least 1 day, the amount of data per day is at least 12, and the meteorological conditions at the time of collection include at least one of the rainfall scenario and the drought scenario.

[0014] Furthermore, the method described above, wherein preprocessing the measured dataset and dividing the measured dataset according to meteorological conditions includes:

[0015] The measured dataset is divided according to the meteorological conditions at the time of data collection, using statistical methods of monitoring data.

[0016] Furthermore, the method described above, in determining the intermediate stable layer of soil moisture content in the measured data set during the precipitation period, includes:

[0017] Based on the measured dataset of the precipitation period, the soil moisture content at each depth at the initial moment of the rainfall scenario was determined;

[0018] The moment when the soil moisture content increases by 10% after precipitation is defined as the soil moisture content response point, and the response time of soil at each depth is determined.

[0019] Based on the response time at each soil depth, the intermediate stable layer of soil moisture content during the precipitation period in the monitoring profile is determined.

[0020] Furthermore, the method described above, in determining the intermediate stable layer of soil moisture content in the measured dataset during the drought period, includes:

[0021] A fast Fourier transform was performed on the measured dataset during the drought period to obtain the power spectral density at different frequencies.

[0022] Based on the power spectral density at different frequencies, the variation pattern of the measured dataset during the drought period over time is transformed into frequency characteristics;

[0023] The power spectral density of the soil at different depths is monitored at preset time intervals.

[0024] Based on the power spectral density at different depths of the soil, the intermediate stable layer of soil moisture content during the drought period of the monitoring profile is determined.

[0025] Furthermore, the method described above, wherein determining the intermediate stable layer of soil moisture content in the monitoring profile based on the intermediate stable layers of soil moisture content in all the divided measured datasets, includes:

[0026] When the measured dataset has both measured datasets during the precipitation period and measured datasets during the drought period, the soil depth of the intermediate stable layer of soil moisture content during the precipitation period and the soil depth of the intermediate stable layer of soil moisture content during the drought period of the monitoring profile are determined.

[0027] Determine the overlapping portion of the soil depth of the intermediate stable layer of soil moisture content during the precipitation period and the soil depth of the intermediate stable layer of soil moisture content during the drought period of the monitoring profile;

[0028] The soil depth of the overlapping portion is determined as the intermediate stable layer of soil moisture content in the monitoring profile;

[0029] When the measured dataset only has the measured dataset during the precipitation period, the intermediate stable layer of soil moisture content measured by the measured dataset during the precipitation period will be determined as the intermediate stable layer of soil moisture content of the monitoring profile.

[0030] When the measured dataset only has the measured dataset during the dry season, the intermediate stable layer of soil moisture content measured based on the measured dataset during the dry season will be determined as the intermediate stable layer of soil moisture content in the monitoring profile.

[0031] Secondly, this application provides an apparatus for identifying an intermediate stable layer of soil moisture content, comprising:

[0032] The data acquisition module is used to acquire the measured data set of soil moisture content from the monitoring profile;

[0033] The data preprocessing module is used to preprocess the measured dataset and divide the measured dataset according to meteorological conditions; wherein the divided measured dataset includes at least one of the measured dataset during the precipitation period and the measured dataset during the drought period.

[0034] The subset soil moisture content intermediate stable layer determination module is used to determine the soil moisture content intermediate stable layer of all the partitioned measured datasets;

[0035] The soil moisture content intermediate stable layer determination module is used to determine the soil moisture content intermediate stable layer of the monitoring profile based on the soil moisture content intermediate stable layers of all the divided measured datasets.

[0036] Thirdly, this application provides a device for identifying intermediate stable layers of soil moisture content, including a processor and a memory, wherein the processor is connected to the memory:

[0037] The processor is used to call and execute the program stored in the memory;

[0038] The memory is used to store the program, which is used to execute at least the method for identifying intermediate stable layers of soil moisture content as described in any of the above-mentioned methods.

[0039] The beneficial effects of this invention are as follows:

[0040] 1. New judgment indicators have been added: Traditional methods only analyze and process data during precipitation periods to determine the intermediate stable layer of soil moisture content, while this method also analyzes and processes data during drought periods, and can also determine the intermediate stable layer of soil moisture content.

[0041] 2. More objective identification method: Traditional statistical methods for identifying soil moisture response time (soil moisture content increases by 10%) are prone to human error. This method, which identifies the intermediate stable layer of soil moisture content during drought, is based on Fourier transform. Compared with traditional statistical methods, this method is simpler, has fewer sources of error, and is more accurate.

[0042] 3. Complementary to traditional methods: Based on the traditional method of judging the intermediate stable layer of soil moisture content by the response time of soil moisture content after precipitation, the difference in the daily fluctuation range of soil moisture content during the drought period is introduced to judge the intermediate stable layer of soil moisture content. The two independent methods of precipitation period and drought period jointly identify the intermediate stable layer of soil moisture content, making the identification results more stable and accurate.

[0043] 4. Wider Applicability: Compared with traditional methods that only determine the intermediate stable layer of soil moisture content based on the response time of soil moisture content during the precipitation period, the new method can analyze the daily dynamics of soil moisture content during the dry period to determine whether the intermediate stable layer of soil moisture content has developed. This means that the identification method based on the new intermediate stable layer of soil moisture content covers the entire non-freezing period, which enables the effective identification of the intermediate stable layer of soil moisture content in arid and semi-arid areas with scarce precipitation. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart of an embodiment of a method for identifying intermediate stable layers of soil moisture content according to the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of an embodiment of the device for identifying the intermediate stable layer of soil moisture content according to the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of an embodiment of the device for identifying the intermediate stable layer of soil moisture content according to the present invention;

[0048] Figure 4 This is an embodiment of a method for identifying intermediate stable layers of soil moisture content according to the present invention, which provides a feature diagram of soil moisture content response time to precipitation during the precipitation period.

[0049] Figure 5 This is a power spectral density characteristic map of a method for identifying intermediate stable layers of soil moisture content according to the present invention, provided in one embodiment;

[0050] Figure 6 This invention provides a method for identifying intermediate stable layers of soil moisture content, and provides power spectral density characteristic maps of intermediate stable layers of soil moisture content at different time periods during a dry season. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] Figure 1 This is a flowchart illustrating an embodiment of a method for identifying intermediate stable layers of soil moisture content according to the present invention. Please refer to... Figure 1 This embodiment may include the following steps:

[0053] S1. Obtain the measured data set of soil moisture content from the monitoring profile;

[0054] S2. Preprocess the measured dataset and divide it according to meteorological conditions; the divided measured dataset shall include at least one of the measured dataset during the precipitation period and the measured dataset during the drought period.

[0055] S3. Determine the intermediate stable layer of soil moisture content for all divided measured datasets;

[0056] S4. Based on the intermediate stable layer of soil moisture content in all the divided measured datasets, determine the intermediate stable layer of soil moisture content in the monitoring profile.

[0057] Understandably, in this embodiment, the measured soil moisture content dataset of the monitoring profile is first obtained, then the dataset is preprocessed and divided according to meteorological conditions. Next, the intermediate stable layer of soil moisture content in all divided datasets is determined. Finally, based on the intermediate stable layers of soil moisture content in all divided datasets, the intermediate stable layer of soil moisture content in the monitoring profile is determined. In this embodiment, based on the existing method of determining the intermediate stable layer of soil moisture content based on the response time of soil moisture content after precipitation events, a method using the daily fluctuation amplitude characteristics of soil moisture content during drought periods is introduced to identify the intermediate stable layer. This method is combined with the original method, and the intersection of the two methods is used to increase the efficiency and accuracy of identifying the intermediate stable layer of soil moisture content.

[0058] Preferably, step S1 includes:

[0059] Identify monitoring points for at least three monitoring profiles;

[0060] Obtain continuous time series samples of soil moisture content measured at each monitoring point; wherein, the time span of the measured dataset at each monitoring point is at least 1 day, the amount of data per day is at least 12, and the meteorological conditions at the time of collection include at least one of the rainfall scenario and the drought scenario.

[0061] Preferably, step S2 includes:

[0062] The measured dataset is divided according to the meteorological conditions at the time of data collection, using statistical methods of monitoring data.

[0063] Preferably, the intermediate stable layer of soil moisture content in the measured data set during the precipitation period includes:

[0064] Based on the measured data during the precipitation period, the soil moisture content at each depth was determined at the initial moment of the rainfall scenario.

[0065] The moment when the soil moisture content increases by 10% after precipitation is defined as the soil moisture content response point, and the response time of soil at each depth is determined.

[0066] Based on the response time at different soil depths, the intermediate stable layer of soil moisture content during the precipitation period in the monitoring profile was determined.

[0067] Understandably, data from the precipitation period in the measured dataset is selected, and the moment when the soil moisture content increases by 10% after precipitation is defined as the soil moisture content response point. The difference between this point and the start time of the precipitation event is then recorded as the soil moisture content response time. This method is used to determine the response time of monitoring points at different locations throughout the profile. Next, the variation of the soil moisture content response time along depth is determined. If the response time increases sequentially with depth, there is no intermediate stable layer of soil moisture content; otherwise, an intermediate stable layer exists at the depth where the response time is longest. Figure 4 As shown, Figure 4 In the soil profiles a1-e1, the soil moisture content response time increases unidirectionally downwards along the soil profile, with no intermediate stable layer for soil moisture content. Figure 4 In the soil profile from a2 to e2, the soil moisture content response time does not increase sequentially downwards. There is a maximum value in the middle of the soil profile (marked by the dashed box), which is the middle stable layer of soil moisture content.

[0068] Preferably, determining the intermediate stable layer of soil moisture content in the measured dataset during a dry period includes:

[0069] Fast Fourier transform was performed on the measured dataset during the drought period to obtain the power spectral density at different frequencies;

[0070] Based on the power spectral density at different frequencies, the variation pattern of the measured dataset during the drought period over time is transformed into frequency characteristics;

[0071] The power spectral density of the soil at different depths is monitored at preset time intervals.

[0072] Based on the power spectral density at different soil depths, the intermediate stable layer of soil moisture content during the drought period in the monitoring profile was determined.

[0073] Understandably, MATLAB-based code performs a Fast Fourier Transform on drought-period data, further processing it to obtain power spectral densities at different frequencies, thus transforming the data's temporal variation into frequency characteristics. Next, the power spectral density at different monitoring points along a 24-hour period is analyzed to determine the variation of soil moisture power spectral density along depth. If the power spectral density gradually decreases with depth, there is no intermediate stable layer of soil moisture content; otherwise, an intermediate stable layer exists at the depth where the power spectral density is minimum. Figure 5 As shown, the power spectral density decreases unidirectionally downwards along the soil profile, with no intermediate stable layer of soil moisture content; as Figure 6 As shown, the power spectral density decreases in a non-unidirectional manner along the soil profile, and there is a minimum value in the middle of the soil profile (marked by the dashed box). This location is the middle stable layer of soil moisture content.

[0074] Preferably, step S4 includes:

[0075] When the measured dataset has both measured datasets for the precipitation period and measured datasets for the drought period, determine the soil depth of the intermediate stable layer of soil moisture content during the precipitation period and the soil depth of the intermediate stable layer of soil moisture content during the drought period of the monitoring profile.

[0076] Determine the soil depth of the intermediate stable layer of soil moisture content during the precipitation period and the overlapping portion of the soil depth of the intermediate stable layer of soil moisture content during the drought period in the monitoring profile.

[0077] The soil depth of the overlapping part is determined as the intermediate stable layer of soil moisture content in the monitoring profile;

[0078] When the measured dataset only has the measured dataset during the precipitation period, the intermediate stable layer of soil moisture content measured by the measured dataset during the precipitation period will be determined as the intermediate stable layer of soil moisture content of the monitoring profile.

[0079] When the measured dataset only has the measured dataset during the dry season, the intermediate stable layer of soil moisture content measured based on the measured dataset during the dry season will be determined as the intermediate stable layer of soil moisture content in the monitoring profile.

[0080] The present invention also provides an apparatus for identifying the intermediate stable layer of soil moisture content, for implementing the above-described method embodiments. Figure 2 This is a schematic diagram of the structure of an embodiment of the device for identifying the intermediate stable layer of soil moisture content according to the present invention. Figure 2 As shown, it includes:

[0081] Data acquisition module 1 is used to acquire the measured data set of soil moisture content from the monitoring profile;

[0082] Data preprocessing module 2 is used to preprocess the measured dataset and divide the measured dataset according to meteorological conditions; wherein the divided measured dataset includes at least one of the measured dataset during the precipitation period and the measured dataset during the drought period;

[0083] Subset Soil Moisture Content Intermediate Stable Layer Determination Module 3 is used to determine the intermediate stable layer of soil moisture content in all partitioned measured datasets;

[0084] The intermediate stable layer determination module 4 for soil moisture content is used to determine the intermediate stable layer of soil moisture content in the monitoring profile based on the intermediate stable layers of soil moisture content in all the divided measured datasets.

[0085] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0086] The present invention also provides a device for identifying the intermediate stable layer of soil moisture content, for implementing the above-described method embodiments. Figure 3 This is a schematic diagram of the structure of an embodiment of a device for identifying the intermediate stable layer of soil moisture content according to the present invention. Figure 3 As shown, a device for identifying intermediate stable layers of soil moisture content according to this embodiment includes a processor 21 and a memory 22, with the processor 21 connected to the memory 22. The processor 21 is used to call and execute a program stored in the memory 22; the memory 22 is used to store the program, which is used at least to execute a method for identifying intermediate stable layers of soil moisture content according to the above embodiment.

[0087] The specific implementation scheme of the device for identifying the intermediate stable layer of soil moisture content provided in this application embodiment can refer to the implementation scheme of the method for identifying the intermediate stable layer of soil moisture content in any of the above embodiments, and will not be repeated here.

[0088] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0089] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0090] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0091] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0092] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0093] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0094] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0095] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method of identifying an intermediate stable layer in soil water content, characterized by, The method comprises the following steps: obtaining a measured data set of soil moisture content of a monitoring profile; preprocessing the measured data set, and dividing the measured data set according to meteorological conditions; wherein the divided measured data set at least includes one of a measured data set of a rainfall period and a measured data set of a drought period; determining the intermediate stable layer of soil moisture content of all the divided measured data sets; determining the intermediate stable layer of soil moisture content of the monitoring profile according to the intermediate stable layer of soil moisture content of all the divided measured data sets; when the measured data set has both the measured data set of the rainfall period and the measured data set of the drought period, determining the soil depth of the intermediate stable layer of soil moisture content of the monitoring profile in the rainfall period and the soil depth of the intermediate stable layer of soil moisture content of the monitoring profile in the drought period; determining the overlapping part of the soil depth of the intermediate stable layer of soil moisture content of the monitoring profile in the rainfall period and the soil depth of the intermediate stable layer of soil moisture content of the monitoring profile in the drought period; determining the soil depth of the overlapping part as the intermediate stable layer of soil moisture content of the monitoring profile; when the measured data set only has the measured data set of the rainfall period, determining the intermediate stable layer of soil moisture content determined according to the measured data set of the rainfall period as the intermediate stable layer of soil moisture content of the monitoring profile; when the measured data set only has the measured data set of the drought period, determining the intermediate stable layer of soil moisture content determined according to the measured data set of the drought period as the intermediate stable layer of soil moisture content of the monitoring profile; wherein determining the intermediate stable layer of soil moisture content of the measured data set of the drought period comprises: performing fast Fourier transform on the measured data set of the drought period to obtain power spectral density of different frequencies; converting the change rule of the measured data set of the drought period with time into frequency characteristics according to the power spectral density of different frequencies; monitoring the power spectral density of different depths of soil with a period of 1 day; determining the intermediate stable layer of soil moisture content of the monitoring profile in the drought period according to the power spectral density of different depths of soil; wherein determining the intermediate stable layer of soil moisture content of the measured data set of the rainfall period comprises: determining the soil moisture content of each depth at the initial time of the rainfall scenario according to the measured data set of the rainfall period; defining the time when the soil moisture content is lifted by 10% after rainfall as the response point of soil moisture content, and determining the response time of each depth of soil; determining the intermediate stable layer of soil moisture content of the monitoring profile in the rainfall period according to the response time of each depth of soil.

2. The method of claim 1, wherein, The method comprises the following steps: determining at least three monitoring points of the monitoring profile; obtaining a continuous time sequence sample of the measured data set of soil moisture content of each monitoring point; wherein the time span of the measured data set of each monitoring point is at least 1 day, the data amount of each day is at least 12, and the meteorological conditions of the collection time at least include one of rainfall scenario and drought scenario.

3. The method of claim 2, wherein, The preprocessing of the measured data set and the division of the measured data set according to meteorological conditions comprise: The measured data set is divided by a monitoring data statistical method and according to meteorological conditions during data acquisition.

4. An apparatus for identifying an intermediate stable layer in soil water content, characterized by, The method comprises the following steps: a data acquisition module is configured to acquire a soil moisture content measured data set of a monitoring profile; a data preprocessing module is configured to preprocess the measured data set and divide the measured data set according to meteorological conditions; wherein the divided measured data set comprises at least one of a rainfall period measured data set and a drought period measured data set; a subset soil moisture content intermediate stable layer determination module is configured to determine soil moisture content intermediate stable layers of all the divided measured data sets; a soil moisture content intermediate stable layer determination module is configured to determine a soil moisture content intermediate stable layer of the monitoring profile according to the soil moisture content intermediate stable layers of all the divided measured data sets; when the measured data set comprises both the rainfall period measured data set and the drought period measured data set, the soil depth of the soil moisture content intermediate stable layer of the monitoring profile in the rainfall period and the soil depth of the soil moisture content intermediate stable layer of the monitoring profile in the drought period are determined; the overlapping part of the soil depth of the soil moisture content intermediate stable layer of the monitoring profile in the rainfall period and the soil depth of the soil moisture content intermediate stable layer of the monitoring profile in the drought period is determined; the soil depth of the overlapping part is determined as the soil moisture content intermediate stable layer of the monitoring profile; when the measured data set comprises only the rainfall period measured data set, the soil moisture content intermediate stable layer determined according to the rainfall period measured data set is determined as the soil moisture content intermediate stable layer of the monitoring profile; when the measured data set comprises only the drought period measured data set, the soil moisture content intermediate stable layer determined according to the drought period measured data set is determined as the soil moisture content intermediate stable layer of the monitoring profile; wherein the determination of the soil moisture content intermediate stable layer of the drought period measured data set comprises the following steps: the drought period measured data set is subjected to fast Fourier transform to obtain power spectral densities of different frequencies; the variation law of the drought period measured data set with time is converted into frequency characteristics according to the power spectral densities of different frequencies; the power spectral density sizes of different depths of soil are monitored in a preset time cycle; the soil moisture content intermediate stable layer of the monitoring profile in the drought period is determined according to the power spectral density sizes of different depths of soil; wherein the determination of the soil moisture content intermediate stable layer of the rainfall period measured data set comprises the following steps: the soil moisture content of each depth of soil at an initial time of a rainfall scenario is determined according to the rainfall period measured data set; a soil moisture content response point is defined as a time when the soil moisture content is lifted by 10% after rainfall, and the response time of each depth of soil is determined; the soil moisture content intermediate stable layer of the monitoring profile in the rainfall period is determined according to the response time of each depth of soil.

5. An apparatus for identifying an intermediate stable layer in soil water content, characterized by, The method comprises a processor and a memory, and the processor is connected with the memory. The processor is configured to call and execute a program stored in the memory. The memory is configured to store the program, and the program is used to execute the method for identifying the soil moisture content intermediate stable layer according to any one of claims 1-3.

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