Method and device for acquiring evaporation rate of unsaturated soil body and related equipment

Abstract

The invention relates to the technical field of hydrogeology, and discloses a method and a device for acquiring the evaporation rate of an unsaturated soil body and related equipment, and the method for acquiring the evaporation rate of the unsaturated soil body comprises the following steps: acquiring the evaporation rate of the unsaturated soil body on the basis of an evaporation action mode of the unsaturated soil body; an unsaturated soil evaporation model is constructed according to the physical relation of the density calculation parameter, the relative humidity calculation parameter and the retardation coefficient parameter; acquiring unsaturated soil body information of the to-be-measured unsaturated soil body and atmosphere information close to the surface of the to-be-measured unsaturated soil body; determining a retardation coefficient parameter, a density calculation parameter and a relative humidity calculation parameter based on the unsaturated soil body information and the atmosphere information; and solving the unsaturated soil body evaporation model to obtain the unsaturated soil body evaporation rate. The method can improve the accuracy of obtaining the evaporation rate of the unsaturated soil body.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogeology, and in particular to a method and device for obtaining the evaporation rate of an unsaturated soil body, and related equipment. Background Art

[0002] Evaporation is a key factor controlling changes in soil mass and energy. For unsaturated soils, changes in soil moisture and temperature are more significantly affected by evaporation. The evaporation rate is a crucial parameter in the calculation and simulation of unsaturated soil moisture and temperature, directly impacting the accuracy of simulation results. Therefore, accurate evaporation rate measurement is essential.

[0003] At present, the evaporation rate is mostly obtained by weighing, which is mostly suitable for small-scale soil research in the laboratory. However, for large-scale soil in the laboratory or on-site, there are many environmental factors that affect it, and the traditional weighing method has low accuracy. Summary of the Invention

[0004] In view of this, the present invention provides a method, device and related equipment for obtaining the evaporation rate of an unsaturated soil, so as to improve the accuracy of obtaining the evaporation rate of the unsaturated soil.

[0005] In a first aspect, the present invention provides a method for obtaining the evaporation rate of an unsaturated soil, the method for obtaining the evaporation rate of an unsaturated soil comprising: constructing an unsaturated soil evaporation model based on the evaporation mode of the unsaturated soil through the physical relationship between density calculation parameters, relative humidity calculation parameters and resistance coefficient parameters; obtaining unsaturated soil information of the unsaturated soil to be measured and atmospheric information adjacent to the surface of the unsaturated soil to be measured; determining the resistance coefficient parameter, density calculation parameter and relative humidity calculation parameter based on the unsaturated soil information and the atmospheric information; and solving the unsaturated soil evaporation model to obtain the evaporation rate of the unsaturated soil.

[0006] In this implementation method, combined with the characteristics of unsaturated soil, an unsaturated soil evaporation model is constructed by comprehensively considering the density and relative humidity, as well as the influence of the blocking factor on the evaporation rate of unsaturated soil. This can improve the rationality of the model, calculate the soil-related blocking coefficient parameters, density calculation parameters and relative humidity calculation parameters through soil physical information, and calculate the air-related blocking coefficient parameters, density calculation parameters and relative humidity calculation parameters through atmospheric physical information. It can be combined with existing scenarios, consider environmental impacts, improve the accuracy of parameter calculation, and ultimately improve the accuracy of unsaturated soil evaporation rate calculation.

[0007] In an optional embodiment, the resistance coefficient parameters include soil resistance coefficient and air resistance coefficient, the density calculation parameters include saturated air water vapor density, saturated soil water vapor density, soil water vapor density and liquid water density; the relative humidity calculation parameters include soil water vapor relative humidity and air water vapor relative humidity.

[0008] In this implementation, soil-related and air-related resistance coefficient parameters, density calculation parameters, and relative humidity calculation parameters are considered separately, so as to comprehensively consider the characteristics of unsaturated soil.

[0009] In an optional embodiment, the equation of the unsaturated soil evaporation model is:

[0010]

[0011] Where, E s is the evaporation rate of unsaturated soil; r a is the air resistance coefficient; r s is the soil resistance coefficient; ρ L is the density of liquid water; ρ sv is the saturated soil water vapor density; ρ sa is the water vapor density of saturated air; H rs is the relative humidity of soil water vapor; H ra is the relative humidity of air water vapor.

[0012] In this implementation, an unsaturated soil evaporation model is proposed, which comprehensively considers the effects of soil resistance coefficient, air resistance coefficient, saturated air water vapor density, saturated soil water vapor density, soil water vapor relative humidity and air water vapor relative humidity on the evaporation rate of unsaturated soil, thereby improving the accuracy of evaporation rate calculation.

[0013] In an optional embodiment, the unsaturated soil information includes soil moisture content, soil matrix potential, and soil temperature; and the atmospheric information includes air temperature, air water vapor relative humidity, and wind speed.

[0014] In an optional embodiment, obtaining unsaturated soil information of the unsaturated soil to be measured includes: obtaining soil moisture content and soil temperature of the unsaturated soil to be measured; and determining soil matric potential based on the soil moisture content and the soil moisture characteristic curve.

[0015] In an optional embodiment, determining coefficient parameters, density calculation parameters and relative humidity calculation parameters based on unsaturated soil information and atmospheric information includes: calculating soil resistance coefficient based on soil moisture content; calculating air resistance coefficient based on wind speed; calculating saturated air water vapor density based on air temperature; calculating saturated soil water vapor density based on soil temperature; and calculating soil water vapor relative humidity based on soil temperature.

[0016] In a second aspect, the present invention provides a device for obtaining the evaporation rate of an unsaturated soil, and the device for obtaining the evaporation rate of an unsaturated soil includes: a construction module for constructing an unsaturated soil evaporation model based on coefficient parameters, density calculation parameters and relative humidity calculation parameters; an acquisition module for obtaining unsaturated soil information of the unsaturated soil to be measured and atmospheric information on the surface of the unsaturated soil to be measured; a determination module for determining the coefficient parameters, density calculation parameters and relative humidity calculation parameters based on the unsaturated soil information and atmospheric information; and a solution module for solving the unsaturated soil evaporation model to obtain the evaporation rate of the unsaturated soil.

[0017] In a third aspect, the present invention provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to thereby execute the method for obtaining the evaporation rate of an unsaturated soil according to the first aspect or any corresponding embodiment thereof.

[0018] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for obtaining the evaporation rate of an unsaturated soil according to the first aspect or any corresponding embodiment thereof.

[0019] In a fifth aspect, the present invention provides a computer program product comprising computer instructions for causing a computer to execute the method for obtaining the evaporation rate of an unsaturated soil according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 1 is a flow chart of a method for obtaining the evaporation rate of an unsaturated soil according to an embodiment of the present invention;

[0022] Figure 2 is a flow chart of another method for obtaining the evaporation rate of unsaturated soil according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of the evaporation rate of an unsaturated soil according to an embodiment of the present invention;

[0024] Figure 4is a structural block diagram of a device for obtaining the evaporation rate of an unsaturated soil according to an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0027] For small-scale unsaturated soils in the laboratory, a weighing method can be used to determine the evaporation rate of the unsaturated soil, which requires a small amount of sampling and is easy to operate. However, for large-scale or field-scale unsaturated soils, the weighing method is obviously unreasonable and cannot be used for large-scale sampling. Moreover, for field-scale unsaturated soils, the accuracy of existing evaporation rate determination methods is low due to influencing factors. Therefore, this application proposes a method for obtaining the evaporation rate of unsaturated soil and constructs an unsaturated soil evaporation model to improve the accuracy of obtaining the evaporation rate of unsaturated soil.

[0028] According to an embodiment of the present invention, an embodiment of a method for obtaining the evaporation rate of an unsaturated soil is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0029] In this embodiment, a method for obtaining the evaporation rate of unsaturated soil is provided. Figure 1 is a flow chart of a method for obtaining the evaporation rate of an unsaturated soil according to an embodiment of the present invention. It should be noted that if there are substantially the same results, this embodiment does not use Figure 1 The process sequence shown is limited. Figure 1 As shown, the process includes the following steps:

[0030] Step S101 : Based on the evaporation mode of unsaturated soil, an unsaturated soil evaporation model is constructed through the physical relationship between density calculation parameters, relative humidity calculation parameters and resistance coefficient parameters.

[0031] According to the law of conservation of mass, an unsaturated soil evaporation model is constructed based on the difference between the water vapor density in the soil surface and the water vapor density in the air near the soil surface.

[0032] In one implementation, the water vapor density in the soil on the soil surface can be calculated using density calculation parameters and relative humidity calculation parameters of saturated soil, and the water vapor density in the air near the soil surface can be calculated using density calculation parameters and relative humidity calculation parameters of saturated air.

[0033] Furthermore, considering the influence of the retardation coefficient parameter on the evaporation rate of unsaturated soil, an unsaturated soil evaporation model is constructed based on the physical relationship between the retardation coefficient parameter, density calculation parameters and relative humidity calculation parameters.

[0034] Step S102: obtaining unsaturated soil information of the unsaturated soil to be measured and atmospheric information adjacent to the surface of the unsaturated soil to be measured.

[0035] In one implementation, the depth of the unsaturated soil to be measured is determined, the length of the measurement time is determined, and the unsaturated soil information of the unsaturated soil to be measured at the depth to be measured and during the measurement time is obtained based on the atmospheric information at a position near the soil surface of the unsaturated soil to be measured at the depth to be measured and during the measurement time.

[0036] The depth to be measured and the length of time to be measured can be set according to actual detection requirements.

[0037] In one specific implementation, the unsaturated soil is measured at depths of 55 cm and 85 cm, with groundwater levels selected. Sensors are placed at these depths, and a small weather station or other equipment is installed on the surface of the unsaturated soil. The measurement period is set to 144 hours and 20 hours. Sensors are used at depths of 55 cm and 85 cm to collect unsaturated soil information within 144 hours and 20 hours, respectively. The small weather station or other equipment collects atmospheric information within 144 hours and 20 hours, respectively.

[0038] Step S103: determining coefficient parameters, density calculation parameters, and relative humidity calculation parameters based on the unsaturated soil information and the atmospheric information.

[0039] Specifically, soil-related coefficient parameters, density calculation parameters, and relative humidity calculation parameters are determined based on unsaturated soil information, and air-related coefficient parameters, density calculation parameters, and relative humidity calculation parameters are determined based on atmospheric information.

[0040] Step S104: solving the unsaturated soil evaporation model to obtain the unsaturated soil evaporation rate.

[0041] In one implementation, a finite element method is used to solve an unsaturated soil evaporation model based on coefficient parameters, density calculation parameters, and relative humidity calculation parameters to obtain the unsaturated soil evaporation rate.

[0042] The method for obtaining the evaporation rate of unsaturated soil provided in this embodiment combines the characteristics of unsaturated soil and constructs an unsaturated soil evaporation model by comprehensively considering density and relative humidity, as well as the influence of the blocking factor on the evaporation rate of unsaturated soil. This can improve the rationality of the model, calculate soil-related blocking coefficient parameters, density calculation parameters, and relative humidity calculation parameters through soil physical information, and calculate air-related blocking coefficient parameters, density calculation parameters, and relative humidity calculation parameters through atmospheric physical information. This can be combined with existing scenarios, consider environmental impacts, improve the accuracy of parameter calculation, and ultimately improve the accuracy of unsaturated soil evaporation rate calculation.

[0043] In this embodiment, a method for obtaining the evaporation rate of unsaturated soil is provided. Figure 2 is a flow chart of another method for obtaining the evaporation rate of unsaturated soil according to an embodiment of the present invention. It should be noted that if there are substantially the same results, this embodiment does not use Figure 2 The process sequence shown is limited.

[0044] like Figure 2 As shown, the process includes the following steps:

[0045] Step S201 : Based on the evaporation mode of unsaturated soil, an unsaturated soil evaporation model is constructed through the physical relationship between density calculation parameters, relative humidity calculation parameters and resistance coefficient parameters.

[0046] In one implementation, the coefficient parameters include soil resistance coefficient and air resistance coefficient, the density calculation parameters include saturated air water vapor density, saturated soil water vapor density, soil water vapor density and liquid water density; the relative humidity calculation parameters include soil water vapor relative humidity and air water vapor relative humidity.

[0047] According to the law of conservation of mass, an unsaturated soil evaporation model is constructed based on the difference between the water vapor density in the soil surface and the water vapor density in the air near the soil surface. The equation of the unsaturated soil evaporation model is:

[0048]

[0049] Where, E s is the evaporation rate of unsaturated soil (m·s -1 );ρ vs is the water vapor density in the soil surface (kg·m -3 ), ρ va is the water vapor density in the air on the soil surface (kg·m-3 ), r a is the air resistance coefficient (s·m -1 );r s is the soil resistance coefficient (s·m -1 );ρ L is the density of liquid water (kg·m -3 ).

[0050] The water vapor density in the soil on the soil surface can be calculated from the saturated soil water vapor density and soil water vapor relative humidity, and the water vapor density in the air near the soil surface can be calculated from the saturated air water vapor density and air water vapor relative humidity. Specifically, the equation for the unsaturated soil evaporation model is:

[0051]

[0052] Where: ρ sv is the saturated soil water vapor density (kg·m -3 );ρ sa is the saturated air water vapor density (kg·m -3 );H rs is the relative humidity of soil water vapor (m 3 ·m -3 );H ra is the relative humidity of air water vapor (m 3 ·m -3 ).

[0053] Step S202: obtaining unsaturated soil information of the unsaturated soil to be measured and atmospheric information on the surface of the unsaturated soil to be measured.

[0054] Among them, unsaturated soil information includes soil moisture content, soil matrix potential and soil temperature; atmospheric information includes air temperature, air water vapor relative humidity and wind speed.

[0055] Among them, soil matrix potential is the free energy of soil water lower than that of free water under the adsorption effect of soil matrix (solid particles).

[0056] In one implementation, the depth of the unsaturated soil to be measured is determined, the length of the measurement time is determined, a soil moisture sensor and a soil temperature sensor are set at the depth to be measured, the soil moisture sensor is used to collect the soil moisture during the measurement time, and the soil temperature sensor is used to collect the soil temperature during the measurement time.

[0057] Furthermore, the soil matric potential is determined based on the soil moisture content and the soil moisture characteristic curve.

[0058] Among them, the soil moisture characteristic curve is one of the most basic hydraulic characteristic parameters for studying the soil in the vadose zone. It reflects the relationship between soil matrix potential and soil moisture content. Its parameter model generally adopts the VG model.

[0059] Specifically, the specific relationship of the VG model is:

[0060]

[0061] Where θ is the soil moisture content (cm 3 cm -3 ); h is soil matrix potential (m); θ r is the residual soil moisture content (cm 3 cm -3 );θ s is the soil saturated moisture content (cm 3 cm -3 ); α is a parameter related to the inverse of the air intake value of the soil moisture characteristic curve (1 / cm), h b is the air inlet value of the soil moisture characteristic curve (cm); n and m (=1-1 / n) are empirical parameters (dimensionless) reflecting the soil pore distribution.

[0062] In one implementation, a small weather station or other equipment is set up on the surface of the unsaturated soil to be tested, and the small weather station or other equipment is used to collect air temperature, relative humidity of air vapor and wind speed during the test time.

[0063] In one implementation, a temperature sensor, a humidity sensor, and a wind speed sensor are set on the surface of the unsaturated soil to be tested. The temperature sensor is used to collect the air temperature during the test time, the humidity sensor is used to collect the relative humidity of the air water vapor during the test time, and the wind speed sensor is used to collect the wind speed during the test time.

[0064] Step S203: determining coefficient parameters, density calculation parameters, and relative humidity calculation parameters based on the unsaturated soil information and the atmospheric information.

[0065] Specifically, the above step S203 includes:

[0066] Step S2031: Calculate the soil resistance coefficient based on the soil moisture content.

[0067] Among them, the functional relationship between soil moisture content and resistance coefficient is constructed, and the soil resistance coefficient is obtained as follows:

[0068] r s =10×exp[35.63(θ rw -θ top )】

[0069] Where θ rwis an empirical parameter, usually taken as 0.15; θ top is the sudden moisture content of the soil surface (m 3 ·m -3 ).

[0070] Step S2032: Calculate the air resistance coefficient based on the wind speed.

[0071] Among them, the functional relationship between wind speed and air resistance coefficient is constructed, and the air resistance coefficient is obtained as follows:

[0072]

[0073] Where z H is the location where the temperature is measured (m); z 0H is the surface roughness of the heat flux (m); ψ H is the atmospheric stability correction factor for heat flux; k is the von Karman constant (=0.41); u * It is a function related to wind speed (m·s -1 ).

[0074] Step S2033: Calculate the saturated air water vapor density based on the air temperature.

[0075] Among them, the functional relationship between air temperature and saturated air water vapor density is constructed, and the saturated air water vapor density is obtained as follows:

[0076]

[0077] Where T is the soil temperature (K).

[0078] Step S2034: Calculate the saturated soil water vapor density based on the soil temperature.

[0079] Among them, the functional relationship between soil temperature and saturated soil water vapor density is constructed, and the saturated soil water vapor density is obtained as follows:

[0080]

[0081] In the formula, R0=6.0035, R1=4975.9.

[0082] Step S2035: Calculate soil water vapor relative humidity based on soil temperature.

[0083] The relative humidity of soil water vapor can be determined based on the thermodynamic relationship between liquid water and water vapor in soil pores. The functional relationship between soil temperature and relative humidity of soil water vapor is constructed, and the relative humidity of soil water vapor is obtained as follows:

[0084]

[0085] Where, ρ v is the water vapor density in the soil (kg·m -3 ), it can be understood that when calculating the water vapor density in the soil surface, ρ v＝ ρ vs , h is the negative pressure head (m), M is the molar mass of water (=0.018015kg·mol -1 ), g is the acceleration due to gravity (=9.81m·s -2 ), R is the ideal gas constant (=8.314 J·mol -1 ·K -1 ).

[0086] Step S204: solving the unsaturated soil evaporation model to obtain the unsaturated soil evaporation rate.

[0087] In one implementation, a finite element method is used to solve and calculate the soil resistance coefficient, air resistance coefficient, saturated air water vapor density, saturated soil water vapor density, soil water vapor relative humidity, air water vapor relative humidity calculated in step S203 and the unsaturated soil evaporation model constructed in step S201 to obtain the unsaturated soil evaporation rate.

[0088] In a specific implementation, the change of the evaporation rate of the unsaturated soil in a preset time period is obtained when the groundwater level of the unsaturated soil is 55 cm and 85 cm respectively. Figure 3 , Figure 3 FIG. 4 is a schematic diagram of the evaporation rate of an unsaturated soil according to an embodiment of the present invention.

[0089] like Figure 3 As shown, Figure 3 a is the change in evaporation rate of unsaturated soil within a preset time period of 140 hours. Figure 3 b is the change in evaporation rate of unsaturated soil within a preset time period of 20 h.

[0090] This embodiment provides a method for obtaining the evaporation rate of unsaturated soil, proposes an unsaturated soil evaporation model, and proposes a calculation method for the soil resistance coefficient, air resistance coefficient, saturated air water vapor density, saturated soil water vapor density, and soil water vapor relative humidity, which can improve the accuracy of obtaining the evaporation rate of unsaturated soil.

[0091] By comprehensively considering the density and relative humidity, as well as the influence of the blocking factor on the evaporation rate of unsaturated soil, an unsaturated soil evaporation model is constructed, which can improve the rationality of the model. The soil-related blocking coefficient parameters, density calculation parameters and relative humidity calculation parameters are calculated through soil physical information, and the air-related blocking coefficient parameters, density calculation parameters and relative humidity calculation parameters are calculated through atmospheric physical information. It can be combined with existing scenarios, consider environmental impacts, improve the accuracy of parameter calculation, and ultimately improve the accuracy of unsaturated soil evaporation rate calculation.

[0092] This embodiment also provides a device for obtaining the evaporation rate of unsaturated soil. This device is used to implement the above-mentioned embodiments and preferred implementations, and details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented using software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0093] This embodiment provides a device for obtaining the evaporation rate of unsaturated soil, such as Figure 4 Shown, including:

[0094] The construction module 401 is used to construct an unsaturated soil evaporation model based on the evaporation action mode of the unsaturated soil through the physical relationship between the density calculation parameter, the relative humidity calculation parameter and the resistance coefficient parameter.

[0095] The acquisition module 402 is used to acquire unsaturated soil information of the unsaturated soil to be measured and atmospheric information on the surface of the unsaturated soil to be measured.

[0096] The determination module 403 is used to determine the coefficient parameters, density calculation parameters and relative humidity calculation parameters based on the unsaturated soil information and the atmospheric information.

[0097] The solution module 404 is used to solve the unsaturated soil evaporation model to obtain the unsaturated soil evaporation rate.

[0098] In some optional implementations, the building block 401 includes:

[0099] The construction unit is used to determine the unsaturated soil evaporation model based on the retardation coefficient parameter, density calculation parameter and relative humidity calculation parameter according to the law of conservation of mass. The equation of the unsaturated soil evaporation model is:

[0100]

[0101] Where, E s is the evaporation rate of unsaturated soil; r a is the air resistance coefficient; r s is the soil resistance coefficient; ρL is the density of liquid water; ρ sv is the saturated soil water vapor density; ρ sa is the water vapor density of saturated air; H rs is the relative humidity of soil water vapor; H ra is the relative humidity of air vapor. The resistance coefficient parameters include the soil resistance coefficient and the air resistance coefficient. The density calculation parameters include the saturated air vapor density, saturated soil vapor density, soil vapor density, and liquid water density. The relative humidity calculation parameters include the soil vapor relative humidity and the air vapor relative humidity.

[0102] In some optional implementations, the acquisition module 402 includes:

[0103] The acquisition unit is used to obtain the soil moisture content and soil temperature of the unsaturated soil to be measured, and to obtain the air temperature, air water vapor relative humidity and wind speed on the surface of the unsaturated soil to be measured.

[0104] A determination unit is used to determine the soil matric potential based on the soil moisture content and the soil moisture characteristic curve.

[0105] In some optional implementations, the determining module 403 includes:

[0106] The first calculation unit is used to calculate the soil resistance coefficient based on the soil moisture content.

[0107] The second calculation unit is used to calculate the air resistance coefficient based on the wind speed.

[0108] The third calculation unit is configured to calculate the saturated air water vapor density based on the air temperature.

[0109] The fourth calculation unit is used to calculate the saturated soil water vapor density based on the soil temperature.

[0110] The fifth calculation unit is configured to calculate soil water vapor relative humidity based on the soil temperature.

[0111] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0112] In this embodiment, the device for obtaining the evaporation rate of unsaturated soil is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0113] The embodiment of the present invention also provides a computer device having the above Figure 5 The device for obtaining the evaporation rate of unsaturated soil is shown.

[0114] See also Figure 5 , Figure 5 is a structural diagram of a computer device provided by an optional embodiment of the present invention, such as Figure 5 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of a GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories. Equally, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 5 A processor 10 is taken as an example.

[0115] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0116] The memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0117] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0118] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0119] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 5 The bus connection is taken as an example.

[0120] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touch pad, an indicator stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 can include a display device, an auxiliary lighting device (e.g., an LED), and a tactile feedback device (e.g., a vibration motor). The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0121] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0122] A portion of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the form in which the computer program instruction exists in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc. Accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium that can be accessed by the computer.

[0123] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for obtaining the evaporation rate of unsaturated soil, characterized in that: The method comprises: Based on the evaporation mode of unsaturated soil, the evaporation model of unsaturated soil is constructed through the physical relationship between density calculation parameters, relative humidity calculation parameters and resistance coefficient parameters. Acquiring unsaturated soil information of the unsaturated soil to be measured and atmospheric information adjacent to the surface of the unsaturated soil to be measured; Determining the resistance coefficient parameter, the density calculation parameter, and the relative humidity calculation parameter based on the unsaturated soil information and the atmospheric information; The unsaturated soil evaporation model is solved to obtain the unsaturated soil evaporation rate.

2. The method for obtaining the evaporation rate of unsaturated soil according to claim 1, characterized in that: The resistance coefficient parameters include soil resistance coefficient and air resistance coefficient, the density calculation parameters include saturated air water vapor density, saturated soil water vapor density, soil water vapor density and liquid water density; the relative humidity calculation parameters include soil water vapor relative humidity and air water vapor relative humidity.

3. The method for obtaining the evaporation rate of unsaturated soil according to claim 2, characterized in that: The equation of the unsaturated soil evaporation model is: Where, E s is the evaporation rate of the unsaturated soil; r a is the air resistance coefficient; r s is the soil resistance coefficient; ρ L is the density of liquid water; ρ sv is the saturated soil water vapor density; ρ sa is the saturated air water vapor density; H rs is the relative humidity of soil water vapor; H ra is the relative humidity of water vapor in the air.

4. The method for obtaining the evaporation rate of unsaturated soil according to claim 2, characterized in that: The unsaturated soil information includes soil moisture content, soil matrix potential and soil temperature; the atmospheric information includes air temperature, air water vapor relative humidity and wind speed.

5. The method for obtaining the evaporation rate of unsaturated soil according to claim 4, characterized in that: The obtaining of unsaturated soil information of the unsaturated soil to be measured includes: Obtaining the soil moisture content and the soil temperature of the unsaturated soil to be measured; The soil matric potential is determined based on the soil moisture content and the soil moisture characteristic curve.

6. The method for obtaining the evaporation rate of unsaturated soil according to claim 5, characterized in that: The determining of the coefficient parameter, the density calculation parameter, and the relative humidity calculation parameter based on the unsaturated soil information and the atmospheric information includes: Calculating the soil resistance coefficient based on the soil moisture content; calculating the air resistance coefficient based on the wind speed; calculating the saturated air water vapor density based on the air temperature; calculating the saturated soil water vapor density based on the soil temperature; The soil water vapor relative humidity is calculated based on the soil temperature.

7. A device for obtaining the evaporation rate of unsaturated soil, characterized in that: The device comprises: A construction module for constructing an unsaturated soil evaporation model based on coefficient parameters, density calculation parameters, and relative humidity calculation parameters; An acquisition module, configured to acquire unsaturated soil information of the unsaturated soil to be measured and atmospheric information on the surface of the unsaturated soil to be measured; a determination module, configured to determine the coefficient parameter, the density calculation parameter, and the relative humidity calculation parameter based on the unsaturated soil information and the atmospheric information; The solution module is used to solve the unsaturated soil evaporation model to obtain the unsaturated soil evaporation rate.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for obtaining the evaporation rate of an unsaturated soil according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method for obtaining the evaporation rate of an unsaturated soil according to any one of claims 1 to 6.

10. A computer program product, characterized in that The method comprises computer instructions, wherein the computer instructions are used to cause a computer to execute the method for obtaining the evaporation rate of an unsaturated soil according to any one of claims 1 to 6.

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