A critical friction velocity measurement method, device, equipment and storage medium

Abstract

This application provides a method, apparatus, device, and storage medium for measuring critical friction velocity, relating to the field of agricultural technology. The method involves controlling an air supply device to deliver an airflow at a preset wind speed into a preset measurement wind tunnel; soil samples from a preset geographical area are pre-placed in the preset measurement wind tunnel; a first detection device and a second detection device are respectively installed at the top and bottom of the measurement wind tunnel; the method acquires a first particle concentration detected by the first detection device and a second particle concentration detected by the second detection device; and determines the critical friction velocity of the preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed. This allows for accurate and rapid determination of the critical friction velocity of the preset geographical area, improving the prediction accuracy of soil wind erosion models and mitigating the damage caused by soil wind erosion.

Description

Technical Field

[0001] This invention relates to the field of agricultural technology, and more specifically, to a method, apparatus, device, and storage medium for measuring critical frictional velocity. Background Technology

[0002] When wind blows across vegetated or uneven surfaces, it creates friction at the soil-vegetation-atmosphere interface. This friction is caused by turbulent motion and molecular viscosity, with the former being several orders of magnitude greater than the latter (Stull, 2000). Therefore, frictional stress is often referred to as turbulent stress or shear stress. Turbulent stress is directly proportional to the surface friction velocity. The greater the turbulent stress, the greater the friction velocity, and the more severe the erosion of the surface. The critical friction velocity is the friction velocity at the moment soil particles begin to move, and it is one of the most important parameters for judging and predicting whether soil erosion, dust storms, and other phenomena will occur. Wind erosion and dust storms cause the loss of nutrient-rich topsoil, damage soil structure, coarsen soil texture, reduce soil biological productivity, and threaten the sustainable use of land resources and regional atmospheric environmental quality. Therefore, clearly identifying the spatial variability, differences, and influencing factors of the critical friction velocity in typical wind erosion areas is of significant practical importance for analyzing the occurrence of soil wind erosion and sandstorms, constructing corresponding models, ensuring the ecological security and high-quality development of farmland in my country, guaranteeing the area of ​​high-quality arable land, land productivity, grain production, food safety, and maintaining the sustainable and efficient use of natural resources.

[0003] Critical friction velocity represents the minimum momentum required for ground sand grains to begin moving, and previous studies simply considered it a fixed value. However, due to variations in sand grain size and weight, the varying protective effects of rough elements such as vegetation, and differences in sand / surface water content, the critical friction velocity of a given surface should be dynamic. In fact, critical friction velocity is influenced by a variety of factors. Reported methods for measuring critical friction velocity are quite limited.

[0004] Driven by the need to improve the theoretical research level of wind and sand physics, develop soil wind erosion models and wind and sand disaster prevention technologies, as well as the advancement of measurement technology, traditional methods for determining critical friction velocity are no longer adequate to meet these new needs. More accurate methods for measuring critical friction velocity are required. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a critical friction velocity measurement method, apparatus, device, and storage medium to solve the problems of inaccurate measurement of sand-raising wind speed in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a method for measuring critical frictional velocity, the method comprising:

[0008] The air supply equipment is controlled to send an airflow with a preset wind speed into a preset measurement wind tunnel; a soil sample from a preset geographical area is placed in the preset measurement wind tunnel; a first detection device and a second detection device are respectively installed at the top and bottom of the preset measurement wind tunnel.

[0009] Obtain the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device;

[0010] The critical friction velocity of the preset geographical area is determined based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0011] Optionally, determining the critical friction velocity of the preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed includes:

[0012] The sand-lifting wind speed of the soil sample is determined based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0013] The critical friction velocity of the preset geographical area is determined based on the sand-lifting wind speed of the soil sample.

[0014] Optionally, determining the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed includes:

[0015] Determine whether the concentrations of the first particle and the second particle meet the preset sand-inducing conditions;

[0016] If the first particle concentration and the second particle concentration meet the preset sand-inducing conditions, then the preset wind speed is determined as the sand-inducing wind speed.

[0017] Optionally, determining the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed further includes:

[0018] If the concentration of the first particle and the concentration of the second particle do not meet the preset sand-raising conditions, the preset wind speed is adjusted to obtain the adjusted wind speed;

[0019] Continue to control the air supply equipment to send the airflow with the adjusted wind speed into the preset measurement wind tunnel until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-raising conditions;

[0020] The adjusted wind speed when the preset sand-inducing conditions are met is the sand-inducing wind speed.

[0021] Optionally, determining whether the first particle concentration and the second particle concentration meet the preset sand-raising conditions includes:

[0022] Determine whether the change in the concentration of the first particle is less than or equal to a first preset threshold.

[0023] Determine whether the growth rate of the second particle concentration is greater than or equal to a second preset threshold;

[0024] If the change in the first particle concentration is less than or equal to the first preset threshold, and the growth rate of the second particle concentration is greater than or equal to the second preset threshold, then the first particle concentration and the second particle concentration are determined to meet the preset sand-inducing conditions.

[0025] Optionally, multiple second detection devices are respectively installed at multiple height positions at the bottom of the preset measurement wind tunnel, and the step of obtaining the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device includes:

[0026] The concentration of a first particle detected by the first detection device and the concentration of a plurality of second particles detected by a plurality of second detection devices are obtained.

[0027] Optionally, the sand-raising wind speed of the soil sample includes: the sand-raising wind speed at the multiple height positions in the preset measurement wind tunnel;

[0028] The step of determining the critical friction velocity of the preset geographical area based on the sand-lifting wind speed of the soil sample includes:

[0029] The critical friction velocity of the preset geographical area is determined based on the sand-raising wind speed at the multiple height locations.

[0030] Secondly, embodiments of this application provide a critical friction velocity measuring device, the device comprising:

[0031] The control module is used to control the air supply equipment to send an airflow of a preset wind speed into a preset measurement wind tunnel; the preset measurement wind tunnel contains a soil sample from a preset geographical area, and the top and bottom of the measurement wind tunnel are respectively equipped with a first detection device and a second detection device.

[0032] The acquisition module is used to acquire the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device;

[0033] The determination module is used to determine the critical friction velocity of the preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0034] Thirdly, embodiments of this application provide an electronic device, including: a processor and a storage medium, wherein the processor and the storage medium are connected via a bus for communication, the storage medium stores program instructions executable by the processor, and the processor calls the program stored in the storage medium to execute the steps of the critical friction speed measurement method as described in any of the first aspects.

[0035] Fourthly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a processor, performs the steps of the critical friction velocity measurement method as described in any of the first aspects.

[0036] Compared with the prior art, this application has the following beneficial effects:

[0037] This application provides a method, apparatus, device, and storage medium for measuring critical friction velocity. The method involves controlling an air supply device to deliver an airflow at a preset wind speed into a preset measurement wind tunnel. Soil samples from a preset geographical area are pre-placed in the wind tunnel. A first detection device and a second detection device are respectively installed at the top and bottom of the wind tunnel. The method acquires a first particle concentration detected by the first detection device and a second particle concentration detected by the second detection device. Based on the first particle concentration, the second particle concentration, and the preset wind speed, the critical friction velocity of the preset geographical area is determined. This allows for accurate and rapid determination of the critical friction velocity of the preset geographical area, improving the prediction accuracy of soil wind erosion models and mitigating the hazards of soil wind erosion. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating a critical friction velocity measurement method provided in this application;

[0040] Figure 2 A flowchart illustrating a method for determining the critical friction speed of a preset geographical area, provided in an embodiment of this application;

[0041] Figure 3 A flowchart illustrating a method for determining the wind speed at which sand is lifted from a soil sample, provided in an embodiment of this application;

[0042] Figure 4 A flowchart illustrating another method for determining the wind speed at which sand is lifted from a soil sample, provided in an embodiment of this application.

[0043] Figure 5 A flowchart illustrating a method for determining preset sand-raising conditions provided in an embodiment of this application;

[0044] Figure 6 A schematic diagram of a critical friction velocity measuring device provided in an embodiment of this application;

[0045] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of this application.

[0046] Icons: 601-Control Module, 602-Acquisition Module, 603-Determining Module, 701-Processor, 702-Storage Medium. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0051] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0052] To accurately determine the critical friction velocity of soil in a geographical environment, this application provides a method, apparatus, device, and storage medium for measuring critical friction velocity.

[0053] The following specific examples illustrate the critical friction velocity measurement method provided in this application. Figure 1This application provides a flowchart illustrating a method for measuring critical frictional velocity. The execution entity of this method can be an electronic device, such as a desktop computer or laptop computer, that has computational processing capabilities. Figure 1 As shown, the method includes:

[0054] S101. Control the air supply equipment to send airflow with a preset wind speed into the preset measurement wind tunnel.

[0055] Soil samples from a predetermined geographical area are pre-placed in the pre-set measurement wind tunnel. A first detection device and a second detection device are respectively installed at the top and bottom of the pre-set measurement wind tunnel. The first detection device and the second detection device are of the same type.

[0056] For example, obtain soil samples from a predetermined geographical area (it should be noted that the soil samples must be undisturbed "in-situ soil samples" within the predetermined geographical area). Prepare a 100cm*30cm soil tray, place the soil samples collected from the predetermined geographical area flat in the tray, fill evenly, and use a ruler to level the soil surface to ensure flatness. Place the tray in a predetermined measurement wind tunnel. Determine the particle physicochemical properties of the soil samples (soil mechanical composition, soil organic matter content, total calcium content, total nitrogen content, pH value, etc.). Also measure the geometric mean diameter of the soil samples. Determine the type of detection equipment based on the geometric mean diameter of the soil samples. For example, soil samples with a larger geometric mean diameter are measured using the E_sampler total suspended particulate detector, while soil samples with a smaller geometric mean diameter are measured using the DustTrak total suspended particulate detector.

[0057] S102, Obtain the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device.

[0058] The first detection device is used to measure the particle concentration at the top of a preset wind tunnel, and the second detection device is used to measure the particle concentration at the bottom of the preset wind tunnel. The first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device are acquired in real time. The particle concentration refers to the total suspended particulate matter concentration.

[0059] S103. Determine the critical friction velocity of the preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0060] The first particle concentration characterizes the particle concentration at the top of the preset measurement wind tunnel, and the second particle concentration characterizes the particle concentration at the bottom of the preset measurement wind tunnel.

[0061] Based on real-time measurements of the first and second particle concentrations, it can be determined whether sand particle movement has begun in the soil sample within the pre-set wind tunnel. If sand particle movement has begun, the critical friction velocity of the soil sample can be determined based on the pre-set wind speed. This allows for the determination of the critical friction velocity of a pre-set geographical area. The critical friction velocity is the critical surface friction velocity of the soil in the pre-set geographical area. Critical friction velocity is the most important parameter for determining whether soil erosion, dust storms, and other phenomena have occurred. Therefore, accurately and quickly determining the critical friction velocity of a pre-set geographical area improves the prediction accuracy of soil erosion models and reduces the damage caused by soil erosion.

[0062] In summary, in this embodiment, an airflow with a preset wind speed is delivered into a preset measurement wind tunnel by controlling an air supply device. Soil samples from a preset geographical area are pre-placed in the preset measurement wind tunnel, and a first detection device and a second detection device are respectively installed at the top and bottom of the wind tunnel. The first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device are obtained. Based on the first particle concentration, the second particle concentration, and the preset wind speed, the critical friction velocity of the preset geographical area is determined. Thus, the critical friction velocity of the preset geographical area is accurately and quickly determined, improving the prediction accuracy of the soil wind erosion model and reducing the harm caused by soil wind erosion.

[0063] In the above Figure 1 Based on the corresponding embodiments, this application also provides a method for determining the critical friction speed of a preset geographical area. Figure 2 This is a flowchart illustrating a method for determining the critical friction speed of a preset geographical area, as provided in an embodiment of this application. Figure 2 As shown, in S103, the critical friction velocity of a preset geographical area is determined based on the first particle concentration, the second particle concentration, and the preset wind speed, including:

[0064] S201. Determine the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0065] Based on the real-time measurements of the first and second particle concentrations, it can be determined whether sand particles have begun to move in the soil sample within the preset measurement wind tunnel. If sand particles begin to move in the soil sample, the current preset wind speed can be determined as the sand-lifting wind speed of the soil sample, which is the wind speed at which the sample is suddenly blown.

[0066] S202. Determine the critical friction velocity of the preset geographical area based on the sand-lifting wind speed of the soil sample.

[0067] The wind speed at which sand particles begin to move in a soil sample characterizes the velocity at which sand particles begin to move. Based on the wind speed at which sand particles begin to move in a soil sample, the critical friction velocity for a predetermined geographical area can be accurately determined.

[0068] In summary, in this embodiment, the sand-lifting wind speed of the soil sample is determined based on the first particle concentration, the second particle concentration, and the preset wind speed; the critical friction velocity of the preset geographical area is then determined based on the sand-lifting wind speed of the soil sample. Thus, the critical friction velocity of the preset geographical area is accurately determined.

[0069] In the above Figure 2 Based on the corresponding embodiments, this application also provides a method for determining the wind speed at which sand is lifted from a soil sample. Figure 3 This is a flowchart illustrating a method for determining the wind speed at which sand is lifted from a soil sample, as provided in an embodiment of this application. Figure 3 As shown, in S201, the dust-raising wind speed of the soil sample is determined based on the first particle concentration, the second particle concentration, and the preset wind speed, including:

[0070] S301. Determine whether the concentration of the first particle and the concentration of the second particle meet the preset sand-inducing conditions.

[0071] The preset sand-moving conditions characterize the critical state at which sand particles begin to move in a soil sample.

[0072] S302. If the concentration of the first particle and the concentration of the second particle meet the preset sand-inducing conditions, then the preset wind speed is determined as the sand-inducing wind speed.

[0073] If the concentrations of the first and second particles meet the preset conditions for sand initiation, it indicates that sand particles in the soil sample have begun to move, and the current preset wind speed can be determined as the sand initiation wind speed of the soil sample.

[0074] In summary, in this embodiment, it is determined whether the concentrations of the first and second particles meet the preset sand-inducing conditions; if the concentrations of the first and second particles meet the preset sand-inducing conditions, the preset wind speed is determined as the sand-inducing wind speed. Thus, by using the preset sand-inducing conditions, the sand-inducing wind speed of the soil sample is accurately determined.

[0075] In the above Figure 2 Based on the corresponding embodiments, this application also provides another method for determining the wind speed at which sand is lifted from a soil sample. Figure 4 This is a flowchart illustrating another method for determining the wind speed at which sand is lifted from a soil sample, provided as an embodiment of this application. Figure 4 As shown, determining the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed in S201 also includes:

[0076] S401. If the concentration of the first particle and the concentration of the second particle do not meet the preset sand-raising conditions, the preset wind speed is adjusted to obtain the adjusted wind speed.

[0077] If the concentrations of the first and second particles do not meet the preset sand-moving conditions, it indicates that sand particles have not started to move in the soil sample, meaning that the current preset wind speed is too low to cause sand particle movement. Therefore, the preset wind speed is adjusted (increased) to obtain the adjusted wind speed.

[0078] S402. Continue to control the air supply equipment to send airflow with adjusted wind speed into the preset measurement wind tunnel until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-raising conditions.

[0079] For example, multiple sets of wind speeds with equal intervals are arranged from smallest to largest to obtain a wind speed sequence. Using this wind speed sequence, a preset wind speed is adjusted at preset time intervals. For instance, the wind speed is increased in a gradient from 1 m / s to 20 m / s, with an increase rate of 1 m / s every 10 seconds. (Within every 10 seconds, if the first particle concentration and the second particle concentration meet the preset sand-inducing conditions, the preset wind speed is determined as the sand-inducing wind speed, and air supply is stopped; if the first particle concentration and the second particle concentration do not meet the preset sand-inducing conditions, the preset wind speed is increased until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-inducing conditions). The increase in wind speed gradient is crucial in this embodiment, as it directly affects the resolution of the final critical friction velocity. The larger the wind speed gradient, the faster the wind speed increases, resulting in a smaller resolution of the obtained critical friction velocity and a worse effect; conversely, the smaller the wind speed gradient, the slower the wind speed increases, resulting in a larger resolution of the obtained critical friction velocity and a better effect.

[0080] S403. Determine the adjusted wind speed when the preset sand-raising conditions are met as the sand-raising wind speed.

[0081] If the concentrations of the first and second particles meet the preset sand-raising conditions, it indicates that sand particles in the soil sample have begun to move. The adjusted wind speed when the preset sand-raising conditions are met can then be determined as the sand-raising wind speed of the soil sample.

[0082] In summary, in this embodiment, if the first particle concentration and the second particle concentration do not meet the preset sand-inducing conditions, the preset wind speed is adjusted to obtain the adjusted wind speed; the air supply equipment continues to control the airflow at the adjusted wind speed into the preset measurement wind tunnel until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-inducing conditions; the adjusted wind speed when the preset sand-inducing conditions are met is determined as the sand-inducing wind speed. Thus, by using the preset sand-inducing conditions, the sand-inducing wind speed of the soil sample is accurately determined.

[0083] In the above Figure 3 Based on the corresponding embodiments, this application also provides a method for determining preset sand-raising conditions. Figure 5 This is a flowchart illustrating a method for determining preset sand-generating conditions, provided in an embodiment of this application. Figure 5As shown, determining whether the concentrations of the first and second particles meet the preset sand-inducing conditions in S301 includes:

[0084] S501. Determine whether the change in the concentration of the first particle is less than or equal to the first preset threshold.

[0085] S502. Determine whether the growth rate of the second particle concentration is greater than or equal to the second preset threshold.

[0086] S503. If the change in the concentration of the first particle is less than or equal to the first preset threshold, and the growth rate of the concentration of the second particle is greater than or equal to the second preset threshold, then the concentration of the first particle and the concentration of the second particle are determined to meet the preset sand-inducing conditions.

[0087] The first particle concentration characterizes the particle concentration at the top of the preset measurement wind tunnel. If the change in the first particle concentration is less than or equal to the first preset threshold, it indicates that the suspended particulate matter at the top of the preset measurement wind tunnel is very stable and there is no significant increase in suspended particulate matter.

[0088] The second particle concentration characterizes the particle concentration at the bottom of the preset measurement wind tunnel. If the growth rate of the second particle concentration is greater than or equal to the second preset threshold, it indicates that the suspended particulate matter at the bottom of the preset measurement wind tunnel has increased dramatically, with a large number of new suspended particulate matter added. For example, the second preset threshold can be 100%, and a growth rate of the second particle concentration greater than or equal to 100% is considered a dramatic increase.

[0089] There was no significant increase in suspended particulate matter at the top of the pre-set measurement wind tunnel, but a dramatic increase in suspended particulate matter at the bottom. This state was identified as the critical state in which sand particles began to move in the soil sample.

[0090] In summary, in this embodiment, it is determined whether the change in the concentration of the first particle is less than or equal to a first preset threshold; it is also determined whether the growth rate of the concentration of the second particle is greater than or equal to a second preset threshold; if the change in the concentration of the first particle is less than or equal to the first preset threshold, and the growth rate of the concentration of the second particle is greater than or equal to the second preset threshold, then it is determined that the concentrations of the first particle and the concentration of the second particle meet the preset sand-inducing conditions. Thus, it accurately determines whether the concentrations of the first particle and the concentration of the second particle meet the preset sand-inducing conditions.

[0091] In the above Figure 2 Based on the corresponding embodiment, multiple second detection devices are respectively installed at multiple height positions at the bottom of the preset measurement wind tunnel. In this embodiment, obtaining the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device in S102 includes:

[0092] The concentration of a first particle detected by a first detection device and the concentration of multiple second particles detected by multiple second detection devices are obtained.

[0093] When determining the critical friction velocity of a preset geographical area using a first particle concentration, a second particle concentration, and a preset wind speed, the second particle concentration detected by the second detection device at different heights varies, resulting in different sand-raising wind speeds based on the second particle concentration at different heights. To accurately calculate the critical friction velocity of the preset geographical area, multiple second particle concentrations detected by the second detection device at multiple heights are obtained. For example, the multiple heights can be evenly distributed between 0 meters and 1 meter.

[0094] For each second detection device at a given height, steps S102 and S201 are performed to obtain the sand-raising wind speeds at multiple height locations. The specific method for obtaining the sand-raising wind speeds at multiple height locations is similar to the above embodiment and will not be repeated here.

[0095] In summary, in this embodiment, multiple second detection devices are respectively installed at multiple height positions at the bottom of the preset measurement wind tunnel to obtain the first particle concentration detected by the first detection device and the multiple second particle concentrations detected by the multiple second detection devices. Thus, the sand-raising wind speeds at multiple height positions are obtained.

[0096] Based on the above embodiments, the sand-raising wind speed of the soil sample in this application embodiment includes: the sand-raising wind speed at multiple height positions in a preset measurement wind tunnel.

[0097] Furthermore, in S202, based on the sand-lifting wind speed of the soil sample, the critical friction velocity of the preset geographical area is determined, including:

[0098] The critical friction velocity for a preset geographical area is determined based on the sand-raising wind speed at multiple height locations.

[0099] The specific calculation method for the critical friction velocity of the preset geographical area based on the sand-raising wind speed at multiple height positions is shown in the following formula (1):

[0100]

[0101] Among them, U * U is the critical frictional speed. z is the sand-raising wind speed at height z (m), k is the von Kármán constant, and z0 is the aerodynamic roughness.

[0102] Due to U * Since z0 is unknown, by substituting the sand-raising wind speed and height at multiple height locations into formula (1), the precise critical friction speed can be obtained, which is the critical friction speed of the preset geographical area.

[0103] In summary, in this embodiment, the critical friction velocity of a preset geographical area is determined based on the sand-raising wind speed at multiple height locations. This allows for the accurate determination of the critical friction velocity of the preset geographical area.

[0104] Furthermore, after performing the steps corresponding to the above embodiments, a group of soil samples with a different geometric mean diameter from the soil samples can be selected as verification samples.

[0105] Repeat the steps corresponding to the above embodiments to obtain the critical friction velocity of the validation sample. Compare the critical friction velocity of the soil sample with that of the validation sample.

[0106] If the relationship between the critical friction velocity of the soil sample and the critical friction velocity of the verification soil is the same as the relationship between the geometric mean diameter of the soil sample and the geometric mean diameter of the verification soil (both are larger or smaller), then the steps in the above embodiments can accurately obtain the critical friction velocity of the soil. If the relationship between the critical friction velocity of the soil sample and the critical friction velocity of the verification soil is opposite to the relationship between the geometric mean diameter of the soil sample and the geometric mean diameter of the verification soil, then the steps in the above embodiments may not accurately obtain the critical friction velocity of the soil, and the steps in the above embodiments need to be adjusted.

[0107] The following describes a critical friction velocity measuring device, equipment, and storage medium provided in this application for implementation. The specific implementation process and technical effects are described above and will not be repeated below.

[0108] Figure 6 A schematic diagram of a critical friction velocity measuring device provided in an embodiment of this application is shown below. Figure 6 As shown, the device includes:

[0109] The control module 601 is used to control the air supply equipment to send an airflow with a preset wind speed into the preset measurement wind tunnel; the preset measurement wind tunnel contains soil samples from a preset geographical area, and the top and bottom of the measurement wind tunnel are respectively equipped with a first detection device and a second detection device.

[0110] The acquisition module 602 is used to acquire the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device.

[0111] The determination module 603 is used to determine the critical friction velocity of a preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed.

[0112] Furthermore, module 603 is specifically used to determine the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed; and to determine the critical friction speed of the preset geographical area based on the sand-lifting wind speed of the soil sample.

[0113] Furthermore, module 603 is specifically used to determine whether the first particle concentration and the second particle concentration meet the preset sand-inducing conditions; if the first particle concentration and the second particle concentration meet the preset sand-inducing conditions, then the preset wind speed is determined as the sand-inducing wind speed.

[0114] Furthermore, module 603 is specifically used to adjust the preset wind speed if the first particle concentration and the second particle concentration do not meet the preset sand-inducing conditions, to obtain the adjusted wind speed; continue to control the air supply equipment to send the airflow with the adjusted wind speed into the preset measuring wind tunnel until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-inducing conditions; and determine the adjusted wind speed when the preset sand-inducing conditions are met as the sand-inducing wind speed.

[0115] Furthermore, the determination module 603 is specifically used to determine whether the change in the concentration of the first particle is less than or equal to the first preset threshold; to determine whether the growth rate of the concentration of the second particle is greater than or equal to the second preset threshold; if the change in the concentration of the first particle is less than or equal to the first preset threshold, and the growth rate of the concentration of the second particle is greater than or equal to the second preset threshold, then the first particle concentration and the second particle concentration are determined to meet the preset sand-inducing conditions.

[0116] Furthermore, the acquisition module 602 is specifically used to acquire the first particle concentration detected by the first detection device and the multiple second particle concentrations detected by the multiple second detection devices.

[0117] Furthermore, the determination module 603 is specifically used for determining the sand-raising wind speed of soil samples, including: pre-setting the sand-raising wind speed at multiple height positions in the wind tunnel; and determining the critical friction velocity of a preset geographical area based on the sand-raising wind speed of the soil samples, including: determining the critical friction velocity of the preset geographical area based on the sand-raising wind speed at multiple height positions.

[0118] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of this application. The electronic device may be a device with computing processing capabilities.

[0119] The electronic device includes a processor 701 and a storage medium 702. The processor 701 and the storage medium 702 are connected via a bus.

[0120] Storage medium 702 is used to store programs, and processor 701 calls the programs stored in storage medium 702 to execute the above method embodiments. The specific implementation and technical effects are similar, and will not be described again here.

[0121] Optionally, the present invention also provides a storage medium including a program, which, when executed by a processor, is used to perform the above-described method embodiments. In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0122] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0123] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0124] The integrated units implemented as software functional units described above can be stored in a storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method of measuring the critical friction velocity, characterized in that, The method includes: The air supply equipment is controlled to send an airflow with a preset wind speed into a preset measurement wind tunnel; a soil sample from a preset geographical area is placed in the preset measurement wind tunnel; a first detection device and a second detection device are respectively installed at the top and bottom of the preset measurement wind tunnel. Obtain the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device; The sand-lifting wind speed of the soil sample is determined based on the first particle concentration, the second particle concentration, and the preset wind speed. Based on the sand-lifting wind speed of the soil sample, determine the critical friction speed of the preset geographical area; The step of determining the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed includes: Determine whether the change in the concentration of the first particle is less than or equal to a first preset threshold. Determine whether the growth rate of the second particle concentration is greater than or equal to a second preset threshold; If the change in the first particle concentration is less than or equal to the first preset threshold, and the growth rate of the second particle concentration is greater than or equal to the second preset threshold, then the first particle concentration and the second particle concentration are determined to meet the preset sand-inducing conditions. If the first particle concentration and the second particle concentration meet the preset sand-inducing conditions, then the preset wind speed is determined as the sand-inducing wind speed.

2. The method of claim 1, wherein, The step of determining the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed further includes: If the concentration of the first particle and the concentration of the second particle do not meet the preset sand-raising conditions, the preset wind speed is adjusted to obtain the adjusted wind speed; Continue to control the air supply equipment to send the airflow with the adjusted wind speed into the preset measurement wind tunnel until the first particle concentration and the second particle concentration measured at the adjusted wind speed meet the preset sand-raising conditions; The adjusted wind speed when the preset sand-inducing conditions are met is the sand-inducing wind speed.

3. The method of claim 1, wherein, Multiple second detection devices are respectively installed at multiple height positions at the bottom of the preset measurement wind tunnel. The step of obtaining the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device includes: The concentration of a first particle detected by the first detection device and the concentration of a plurality of second particles detected by a plurality of second detection devices are obtained.

4. The method of claim 3, wherein, The sand-raising wind speed of the soil sample includes: the sand-raising wind speed at the multiple height positions in the preset measurement wind tunnel; The step of determining the critical friction velocity of the preset geographical area based on the sand-lifting wind speed of the soil sample includes: The critical friction velocity of the preset geographical area is determined based on the sand-raising wind speed at the multiple height locations.

5. A critical friction velocity measurement device, characterized by, The device includes: The control module is used to control the air supply equipment to send an airflow of a preset wind speed into a preset measurement wind tunnel; the preset measurement wind tunnel contains a soil sample from a preset geographical area, and the top and bottom of the measurement wind tunnel are respectively equipped with a first detection device and a second detection device. The acquisition module is used to acquire the first particle concentration detected by the first detection device and the second particle concentration detected by the second detection device; The determining module is used to determine the critical friction velocity of the preset geographical area based on the first particle concentration, the second particle concentration, and the preset wind speed. The determining module is specifically used to: determine the sand-lifting wind speed of the soil sample based on the first particle concentration, the second particle concentration, and the preset wind speed; Based on the sand-lifting wind speed of the soil sample, determine the critical friction speed of the preset geographical area; The determining module is specifically used to: determine whether the first particle concentration and the second particle concentration meet the preset sand-inducing conditions; If the first particle concentration and the second particle concentration meet the preset sand-inducing conditions, then the preset wind speed is determined as the sand-inducing wind speed; The determining module is specifically used to: determine whether the change in the concentration of the first particle is less than or equal to a first preset threshold. Determine whether the growth rate of the second particle concentration is greater than or equal to a second preset threshold; If the change in the first particle concentration is less than or equal to the first preset threshold, and the growth rate of the second particle concentration is greater than or equal to the second preset threshold, then the first particle concentration and the second particle concentration are determined to meet the preset sand-inducing conditions.

6. An electronic device, comprising: include: The processor and the storage medium are connected via a bus for communication. The storage medium stores program instructions executable by the processor. The processor calls the program stored in the storage medium to execute the steps of the critical friction speed measurement method as described in any one of claims 1 to 4.

7. A storage medium, characterized by The storage medium stores a computer program, which, when executed by a processor, performs the steps of the critical friction velocity measurement method as described in any one of claims 1 to 4.

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