GB2583409A - Measurement method for measuring thickness of soil layer based on magnetic susceptibility - Google Patents
Measurement method for measuring thickness of soil layer based on magnetic susceptibility Download PDFInfo
- Publication number
- GB2583409A GB2583409A GB2003689.3A GB202003689A GB2583409A GB 2583409 A GB2583409 A GB 2583409A GB 202003689 A GB202003689 A GB 202003689A GB 2583409 A GB2583409 A GB 2583409A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- soil layer
- soil
- magnetic susceptibility
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 158
- 238000000691 measurement method Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims abstract description 47
- 238000005070 sampling Methods 0.000 claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000000523 sample Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004162 soil erosion Methods 0.000 abstract description 22
- 238000012544 monitoring process Methods 0.000 abstract description 16
- 238000005259 measurement Methods 0.000 abstract description 15
- 238000011160 research Methods 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000003628 erosive effect Effects 0.000 description 22
- 238000009825 accumulation Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005404 magnetometry Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B47/00—Soil-working with electric potential applied between tools and soil
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B76/00—Parts, details or accessories of agricultural machines or implements, not provided for in groups A01B51/00 - A01B75/00
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A measurement method for measuring the thickness of a soil layer based on magnetic susceptibility, related to the technical field of soil erosion monitoring. The method comprises: measuring the original magnetic susceptibility Kb of a surface soil layer of sampling point soil (S1); measuring the maximum magnetic susceptibility Km with a magnetic element placed on the surface soil layer (S2); burying the magnetic element at a preset depth below the sampling point soil to form a magnetic layer (S3); measuring a first magnetic susceptibility K1 of the surface soil layer directly above the magnetic layer (S4); after a preset time interval, measuring a second magnetic susceptibility K2 of the surface soil layer directly above the magnetic layer (S5); and calculating a thickness variation value of the soil layer on the basis of a conversion equation between the magnetic susceptibility of the soil layer and the thickness of the soil layer (S6). The measurement method for measuring the thickness of a soil layer based on magnetic susceptibility has extremely small or no disturbance to a sampling point soil layer, produces a measurement result quickly and accurately, obviates the need for any special manual maintenance, provides a great representation of the sampling point soil layer, and has high practicability in scientific research and field monitoring for soil resource protection and soil erosion monitoring.
Description
METHOD FOR MEASURING THICKNESS OF SOIL LAYER BASED ON
MAGNETIC SUSCEPTIBILITY
[0001] The present application claims priority to Chinese Patent Application No. 201811237407.0, entitled "Method for Measuring Thickness of Soil Layer Based on Magnetic Susceptibility" and filed on October 23, 2018 in the China National Intellectual Property Administration, which is incorporated herein by reference in its entirety.
FIELD OF TECHNOLOGY
[0002] The present application relates to the field of monitoring of soil erosion and water loss, and in particular relates to a method for measuring the thickness of a soil layer based on magnetic susceptibility.
BACKGROUND
[0003] Soil erosion is a severe degradation process of soil that restricts the sustainable use of agricultural soil resources worldwide. The basic principle of soil erosion measurement is to directly or indirectly monitor the dynamic thickness changes of a soil layer caused by soil erosion in different temporal-spatial scales. The process of soil erosion is very complex and it is generally not easy to be monitored quantitatively. An erosion needle method, as a method for directly measuring an amount of soil erosion, may be used to measure the amount by which the thickness of a surface soil layer is increased or decreased after loss or accumulation of surface soil by measuring the distance between the tip of an erosion needle and the surface of soil. Specifically, an erosion needle, which is generally a hard long straight needle made of metal, may be vertically inserted into the surface of soil in the field. With the occurrence of soil erosion, the soil at the monitoring point where the erosion needle is located will be lost or accumulated, and accordingly, the thickness of the soil layer will change (decrease or increase). Subsequently, the vertical distances from the erosion needle to the soil surface are measured with a depth gauge before and after the occurrence of the erosion, respectively. The difference between the two measured vertical distances is the thickness variation of the corresponding soil layer.
[0004] Figure 1 shows the specific measurement process of an erosion needle method. The method comprises the following steps: (1) selecting a soil profile of a sampling point; (2) arranging an erosion needle; (3) placing a measuring gasket as a measuring reference plane before measurement; (4) measuring the vertical distance from the exposed end of the erosion needle to the upper end of the measuring gasket by using a depth gauge; (5) calculating the difference between two vertical distances before and after erosion as the thickness variation of the soil layer at the sampling point, wherein the difference directly means the thickness variation of the soil layer after the soil of the point is eroded or accumulated.
[0005] Although the erosion needle method has been widely used, as the erosion needle may be required to be partially buried in the soil layer, the exposed part of the needle will disturb the flow state of air and water, resulting in a significant deviation of the soil loss amount at the sampling point for monitoring, and the deviation becomes larger as the erosion needle stands longer in the field. In addition, the exposed part of the erosion needle is easily disturbed by the external environment, such as animal and human activities and other natural activities, which makes the erosion needle measurement failure.
SUMMARY
[0006] The present application provides a method for measuring the thickness of a soil layer based on magnetic susceptibility, so as to solve the problems of the prior art that the work on soil erosion measurement cannot be effectively carried out and the measurement deviation is large.
[0007] A method for measuring the thickness of a soil layer based on magnetic susceptibility, comprising: S1: determining an initial magnetic susceptibility Kb of a surface soil layer of sampling point soil; S2: determining the maximum magnetic susceptibility Km of a magnetic part when placed on the surface soil layer; S3: burying the magnetic part at a pre-determined depth below soil of the sampling point to form a magnetic layer; S4: determining a first magnetic susceptibility K1 of the surface soil layer right above the magnetic layer; S5: determining a second magnetic susceptibility K2 of the surface soil layer right above the magnetic layer after a pre-determined time interval; S6: calculating the thickness variation of the soil layer according to a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer.
Optionally, in step S6, the conversion equation is: H = 202.60 -93.46e' 1:-0.0067:: 58. 69elel(-° 0503) -54.80e (03371) Wherein, the calculation equation of K* is: Wherein, H is the distance from a probe to the magnetic layer, mm; K* is the integrated magnetic susceptibility of substance, dimensionless; Kb is the initial magnetic susceptibility, dimensionless; Km is the maximum magnetic susceptibility, dimensionless; K is the magnetic susceptibility of substance measured by the probe, dimensionless.
[0008] Optionally, the magnetic strength of the magnetic part is in a range from 6,000 to 10,000, the thickness of the magnetic part is in a range from 0.5 cm to 1.5 cm, and the buried depth of the magnetic part is less than or equal to 20 cm.
[0009] Optionally, in step S3, burying the magnetic part includes cut-and-fill arranging the magnetic part or profile-arranging the magnetic part.
[0010] The technical solution provided by the present application includes the following beneficial technical effects: [0011] Compared with the prior art, the present application provides a method for measuring the thickness of a soil layer based on magnetic susceptibility, which comprises the following steps: determining an initial magnetic susceptibility Kb of a surface soil layer of sampling point soil; determining the maximum magnetic susceptibility Km of a magnetic part when placed on the surface soil layer; burying the magnetic part at a pre-determined depth below the sampling point soil to form a magnetic layer; determining a first magnetic susceptibility K1 of the surface soil layer right above the magnetic layer; determining a second magnetic susceptibility K2 of the surface soil layer right above the magnetic layer after a pre-determined time interval; calculating the thickness variation of the soil layer according to a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer. In an implementation of the present application, a special artificial magnetic part is arranged, and the magnetic susceptibility of the surface soil layer right above the magnetic layer are determined with a probe of a magnetic susceptibility instrument before and after the occurrence of soil erosion, respectively, and the thickness parameter of the soil layer between the magnetic layer and the probe is obtained by a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer, wherein the difference between the two determined thickness values of the soil layer represents the erosion or accumulation amount of the soil layer at the sampling point. As for the method for measuring the thickness of a soil layer based on magnetic susceptibility provided by the present application, the soil layer at a sampling point may be little disturbed or may not be disturbed, the determination result can be rapidly and accurately obtained with a magnetic susceptibility instrument, and the surface soil layer may not be disturbed since the magnetic part is buried inside a soil layer and thus any special manual maintenance may not be required during subsequent measurement period. In addition, equipments required for the measurement are durable and low in cost, and the measuring range of the probe is wide so that the soil layer at the sampling point is more representative, and thus the method of the present application has more strong practicability in scientific research on soil resource conservation, soil erosion monitoring and field monitoring work.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] For the purpose of more clearly illustrating the technical solutions of the present application, the drawings used in the embodiments will be briefly described below. It will be apparent for those skilled in the art that other drawings can also be obtained from these ones herein without any creative input.
[0013] FIG. 1 is a schematic diagram showing the principle of an erosion needle method for measuring the thickness of a soil layer according to an embodiment of the present application.
[0014] FIG. 2 is a flow chart showing a method for measuring the thickness of a soil layer based on magnetic susceptibility according to an embodiment of the present application.
[0015] FIG. 3 is a schematic diagram of the principle of determination of a magnetic layer by a magnetic susceptibility instrument according to an embodiment of the present application.
DESCRIPTION OF THE EMBODIMENTS
[0016] Please refer to FIG. 2, which shows steps of a method for measuring the thickness of a soil layer based on magnetic susceptibility according to an embodiment of the present application.
[0017] A method for measuring the thickness of a soil layer based on magnetic susceptibility, which may also be referred to simply as a magnetic layer detection method, is a rapid measurement for the thickness of a soil layer in which magnetic susceptibility measurement in geophysical research, magnetic difference of common materials and soil erosion rule may be integrated together. Specifically, the method comprises the following steps: [0018] Step S1: determining an initial magnetic susceptibility Kb of the surface soil layer of a sampling point.
[0019] An initial magnetic susceptibility Kb of the surface soil layer of soil of a sampling point is first measured by a magnetic susceptibility instrument before the formal measurement, and the initial magnetic susceptibility Kb is also referred to as the background magnetic susceptibility of the surface soil layer (K-background, Kb for short).
[0020] Step S2: determining the maximum magnetic susceptibility Km of a magnetic part when placed on the surface soil layer.
[0021] A magnetic part with a certain shape and structure is placed on the upper surface of the soil layer, and is measured by a magnetic susceptibility instrument. At this time, the distance between the magnetic part and the probe is zero, and thus the maximum magnetic susceptibility Km (K-maximum, Km for short) may be obtained.
[0022] Step S3: burying the magnetic part at a pre-determined depth below soil of the sampling point to form a magnetic layer.
[0023] The magnetic part is buried under the sampling point soil to form a magnetic layer which can be used as a reference plane, and the magnetic susceptibility of the surface soil layer above the reference plane is in one-to-one correspondence with the thickness of the soil profile. When the thickness of the soil profile becomes smaller, the distance from the probe to the magnetic layer becomes smaller, and the magnetic susceptibility of the surface soil layer becomes greater. Thus, the thickness of the soil profile can be obtained by numerical calculation of the magnetic susceptibility.
[0024] Step S4: determining a first magnetic susceptibility K1 of the surface soil layer right above the magnetic layer.
[0025] As shown in Figure 3, it is a principle and process of determination of a magnetic layer by a magnetic susceptibility instrument. The variation between the two thicknesses of the soil layer represents the loss or accumulation of the soil layer. Here, the first magnetic susceptibility K1 means that: the magnetic susceptibility of the surface soil layer is first recorded with the magnetic susceptibility instrument prior to the occurrence of soil layer erosion after the magnetic part is buried, and the obtained magnetic susceptibility is the first magnetic susceptibility K1. K1 may be compared with the other magnetic susceptibility during the subsequent measurement periods, and the thickness variation of the soil layer in different time periods may be obtained.
[0026] Step S5: determining a second magnetic susceptibility 1<2 of the surface soil layer right above the magnetic layer after a pre-determined time interval.
[0027] Here, the second magnetic susceptibility K2 is specifically the magnetic susceptibility of the surface soil layer obtained in the periodic determination stage at the sampling point. The frequency of the determination may be determined according to the actual needs, for example, with a full consideration of environmental factors, special weather such as sand wind, rainstorm and so on. The magnetic susceptibility of the surface soil layer of a sampling point may be determined at irregular intervals, or may be determined at fixed periodic intervals.
[0028] Step S6: calculating the thickness variation of the soil layer according to a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer [0029] The relationship between magnetic susceptibility of soil layer and thickness of soil layer can be expressed by an accurate exponential curve, which can be summarized as a conversion equation, and the variables involved in the conversion equation include Kb, Km, and the magnetic susceptibility of a surface soil layer after a magnetic part is buried, specifically K1 or K2.
[0030] In the determination method according to an embodiment of the present application, a MS2/magnetic susceptibility meter produced by Bartington company (of the United Kingdom) is employed as the magnetic susceptibility instrument, specifically: a MS2D power supply and reading meter, a MS2D surface scanning probe, a MS2D handle; the magnetic part comprises magnetite powder, cement, fine sand, etc., and is formed by mixing and solidification. The specific implementation process is as below: selecting the sampling point, and determining an initial magnetic susceptibility Kb of soil of the sampling point; fabricating suitable magnetic part with certain magnetic strength, size and amount according to the characteristics of soil of the sampling point, and determining the maximum magnetic susceptibility Km after the magnetic part is placed on the upper surface of soil of the sampling point; burying the magnetic part at a pre-determined depth into soil of the sampling point by a suitable manner according to the characteristics of soil of the sampling point, wherein the depth is matched with the detection range of the MS2D probe, that is, it is ensured that the magnetic susceptibility can be detected by the MS2D probe and displayed on the reading meter, so as to determine a first magnetic susceptibility Kl; determining a detected frequency according to the actual needs, and determining the magnetic susceptibility, wherein all the magnetic susceptibility in the subsequent determination are referred to as the second magnetic susceptibility K2; Substituting Kb, Km, K1, K2 into the conversion equation to obtain the thickness, wherein the difference between the thicknesses is the thickness variation of the soil layer and can represent the erosion or accumulation degree of the soil layer within a pre-determined time.
[0031] The method for measuring the thickness of a soil layer based on magnetic susceptibility according to an embodiment of the present application has the following advantages: (1) Single determination of the thickness of a soil layer takes only 1 to 2 seconds. The employed magnetic susceptibility instrument is a high-quality, portable instrument that can instantly obtain the determined data within 1 to 2 seconds during the determination process. (2) The precision of the determination can be controlled within 2 mm. (3) The soil at the sampling point is almost not disturbed again, because after the magnetic part is buried, the soil layer that has experienced a little disturbance will be fully restored and reached the original state again under natural conditions. (4) It is maintenance free, since the magnetic part and the magnetic susceptibility instrument are all durable equipments, and especially the magnetic pad requires no manual maintenance after being arranged. Therefore, little maintenance of the equipment is required throughout the determination period. (5) The sampling point has good representativeness. The probe used in the embodiments of the present application has a shape of circular ring with a planar detection scope, and the measuring radius is of about 15 cm. Furthermore, the magnetic part is buried in a soil layer so as to have no disturbing action on the soil layer, and thus it does not cause any deviation of measurement. (6) Both the manufacturing cost of the magnetic part and the acquisition cost of the magnetic susceptibility instrument are low, so that the total investment for implementing the method provided by the embodiments of the present application is low.
[0032] The method for measuring the thickness of a soil layer based on magnetic susceptibility according to an embodiment of the present application can be applied to scientific research on soil resource conservation, soil erosion monitoring and field monitoring work. Specifically, the method provided by the embodiments of the present application can be applied in: (1) rapid determination of the amount of soil loss or accumulation of the indoor or field soil erosion experimental plots based on water erosion; (2) long-term in-situ monitoring of the amount of soil erosion or accumulation in the field soil erosion based on water erosion; (3) long-term in-situ monitoring of the amount of soil loss or accumulation in the field soil erosion based on wind erosion.
[0033] The method provided by the embodiments of the present application is particularly suitable for rapid determination of the amount of soil loss and accumulation during performing research and monitoring works on the soil erosion in remote areas.
[0034] Optionally, in step S6, the conversion equation is: H = 202.68 -93.46er; 50. 69er' -Q135°3--54. 80eK 71) Wherein, the calculation equation of Kt is: Wherein, H is the distance from a probe to the magnetic layer, mm; Kt is the integrated magnetic susceptibility of substance, dimensionless; Kb is the initial magnetic susceptibility, dimensionless; Km is the maximum magnetic susceptibility, dimensionless; K is the magnetic susceptibility of substance measured by the probe, dimensionless.
[0035] In the equation, the magnetic susceptibility of substance represented by K specifically refers to K1 and K2, and H1 and H2 are calculated from K1 and K2 in the conversion equation, respectively. The difference (OH) between H1 and H2 is the soil thickness variation of the sampling point after a pre-determined time, and can reflect the amount of soil loss or accumulation at the sampling point.
[0036] Optionally, the magnetic strength of the magnetic part is in a range from 6,000 to 10,000, the thickness of the magnetic part is in a range from 0.5 cm to 1.5 cm, and the buried depth of the magnetic part is less than or equal to 20 cm [0037] According to the method for measuring the thickness of a soil layer based on magnetic susceptibility provided by an embodiment of the present application, the magnetic strength of the magnetic part is in a range from 6,000 to 10,000, the coverage area of the magnetic part is determined according to the characteristics of soil of the sampling point, and the magnetic part may have a shape of a round cake, plate, mesh, or other lamellar regular shape, with a thickness in a range from 0.5cm to 1.5 cm, preferably 1.0 cm, and may be buried in soil of the sampling point at a depth of no more than 20cm to ensure that the magnetic layer can be detected by the probe.
[0038] Optionally, in step S3, burying the magnetic part comprises: cut-and-fill arranging the magnetic part or profile-arranging the magnetic part.
[0039] A more suitable method may be selected to bury the magnetic part. For example, as for field soil, a sandy soil layer has the characteristic of being easily broken, and thus a cut-and-fill arranging manner is suitable. During the implementation process, after the excavation of the sampling point soil, the magnetic part is buried parallel to the upper surface of the original soil layer, and then is covered with the original soil. Since the sandy soil layer can be rapidly and fully restored to the original state under natural conditions, the original soil layer may be considered to be undisturbed by cut-and-fill arranging, and the determination results may not be affected.
[0040] As for the plot (a soil erosion experimental plot, "the plot" for short), the 30 excavation-arranging method may also be adopted.
[0041] As for loamy soil layer, it has a certain degree of consolidation, and a profile-arranging method is suitable to be applied. During the implementation process, the soil near the sampling point is excavated. If the sampling point soil has an area of 30cm x30cm, then a side wall may be excavated adjacent to either side of sampling point soil. With the side wall as a bottom surface, a hole with certain thickness and size which is matched with the magnetic part is excavated toward the soil of sampling point and parallel to the upper surface of the soil, and then the magnetic part is placed therein. In this way, the sampling point soil may be completely undisturbed, and a very accurate thickness variation of the soil layer can be obtained.
[0042] According to the method for measuring the thickness of a soil layer based on magnetic susceptibility provided by the embodiments of the present application, the thickness variation of a soil layer can be rapidly and accurately obtained with a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer by burying a magnetic layer inside a soil layer. The original soil may not be disturbed in the method, and the representativeness of soil of the sampling point is good. Moreover, there is no maintenance expense in the determination period, and the investment for the equipments carrying out the determination is small. The method has good practicability in scientific research on soil resource protection, soil erosion monitoring and field monitoring work, especially is suitable for rapid measurement of the amount of soil loss and accumulation during performing research and measurement on soil erosion and monitoring of soil layer in remote areas.
[0043] It should be noted that terms related to relationship such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Furthermore, the terms "comprise", "include", "comprising", "including" or any other variant thereof is intended to cover the non-exclusive inclusion, so that the article or equipment including a series of elements may include not only those elements but also other elements that have not been explicitly listed, or may include the elements inherent in this process, method, article or equipment. In the case of without further restrictions, an element defined with the statement "include a (an)..." does not exclude that in addition to the element, the process, method, article or equipment includes other identical element.
[0044] The above description is only specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application should not be limited to the embodiments illustrated herein, but should conform to the broadest scope of the principles and novel characteristics disclosed herein.
[0045] It will be understood that the present application should not be limited to the details that have been described above, and various modifications and changes can be made without departing from the scope of the present application. The scope of the present application is limited only by the accompanying claims.
Claims (4)
- WHAT IS CLAIMED IS: 1. A method for measuring thickness of a soil layer based on magnetic susceptibility, comprising: S1: determining an initial magnetic susceptibility Kb of a surface soil layer of a sampling point; S2: determining the maximum magnetic susceptibility Km of a magnetic part when placed on the surface soil layer; S3: burying the magnetic part at a pre-determined depth below the soil of the sampling point to form a magnetic layer; S4: determining a first magnetic susceptibility K1 of the surface soil layer right above the magnetic layer; S5: determining a second magnetic susceptibility K2 of the surface soil layer right above the magnetic layer after a pre-determined time interval; S6: calculating the thickness variation of the soil layer according to a conversion equation between magnetic susceptibility of soil layer and thickness of soil layer.
- 2. The method according to claim 1, wherein the conversion equation in the step S6 is: = 202.68 -93. 46e1"--"967) -58.6907E1°0503) -54. 80014e 33711 wherein, the calculation equation of K* is: wherein, H is the distance from a probe to the magnetic layer, mm; K* is the integrated magnetic susceptibility of substance, dimensionless; Kb is the initial magnetic susceptibility, dimensionless; Km is the maximum magnetic susceptibility, dimensionless; K is the magnetic susceptibility of substance measured by the probe, dimensionless.
- 3. The method according to claim 1, wherein the magnetic strength of the magnetic part is in a range from 6,000 to 10,000, the thickness of the magnetic part is in a range from 0.5cm to 1.5 cm, and the buried depth of the magnetic part is less than or equal to 20cm.
- 4. The method according to claim 1, wherein in the step S3, burying the magnetic part comprises: cut-and-fill arranging the magnetic part or profile-arranging the magnetic part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237407.0A CN109115104B (en) | 2018-10-23 | 2018-10-23 | Determination method for measuring thickness of soil layer based on magnetic susceptibility |
| PCT/CN2018/116403 WO2020082475A1 (en) | 2018-10-23 | 2018-11-20 | Measurement method for measuring thickness of soil layer based on magnetic susceptibility |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB202003689D0 GB202003689D0 (en) | 2020-04-29 |
| GB2583409A true GB2583409A (en) | 2020-10-28 |
| GB2583409B GB2583409B (en) | 2023-02-08 |
Family
ID=64854402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2003689.3A Expired - Fee Related GB2583409B (en) | 2018-10-23 | 2018-11-20 | Measuring soil erosion or deposition using magnetic susceptibility |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109115104B (en) |
| GB (1) | GB2583409B (en) |
| WO (1) | WO2020082475A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114111553B (en) * | 2021-11-25 | 2023-12-08 | 安徽理工大学 | Method for rapidly obtaining thickness of newly-increased farmland reconstructed soil body filling layer |
| CN115480046A (en) * | 2022-10-11 | 2022-12-16 | 中国科学院地理科学与资源研究所 | Estimation method for predicting soil carbon reserves based on loess thickness |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2666251A1 (en) * | 1999-12-17 | 2001-06-17 | Geosensors Inc. | Modular electromagnetic sensing apparatus having improved calibration |
| CN201327530Y (en) * | 2008-11-14 | 2009-10-14 | 东北大学 | Magnetic susceptibility measuring device based on enhanced Moses effect |
| CN101603946A (en) * | 2009-07-14 | 2009-12-16 | 中国科学院水利部成都山地灾害与环境研究所 | Tillage erosion measurement magnetism tracer method |
| CN205825948U (en) * | 2016-05-26 | 2016-12-21 | 中交第一航务工程局有限公司 | Marine jackstone dike sedimentation and the measurement apparatus of jackstone thickness |
| CN207832791U (en) * | 2018-01-29 | 2018-09-07 | 北京师范大学 | Soil loss monitoring device |
| CN108535454A (en) * | 2018-07-10 | 2018-09-14 | 北京师范大学 | A kind of soil erosion test system and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10019694A1 (en) * | 2000-04-20 | 2001-10-31 | Wolfgang Roesler | Method and device for detecting the magnetic susceptibility of soils and / or sediments |
| CN203349778U (en) * | 2013-03-27 | 2013-12-18 | 苏州江南航天机电工业有限公司 | Device for detecting thickness of pouring coverage layer |
| CN206177194U (en) * | 2016-11-24 | 2017-05-17 | 辽宁省水土保持研究所 | Surface soil erosion thickness measuring instrument |
| CN106767371A (en) * | 2016-12-27 | 2017-05-31 | 山东农业大学 | A kind of method that GPR quick detection Reclaimed Soil covers table soil thickness |
-
2018
- 2018-10-23 CN CN201811237407.0A patent/CN109115104B/en not_active Expired - Fee Related
- 2018-11-20 WO PCT/CN2018/116403 patent/WO2020082475A1/en active Application Filing
- 2018-11-20 GB GB2003689.3A patent/GB2583409B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2666251A1 (en) * | 1999-12-17 | 2001-06-17 | Geosensors Inc. | Modular electromagnetic sensing apparatus having improved calibration |
| CN201327530Y (en) * | 2008-11-14 | 2009-10-14 | 东北大学 | Magnetic susceptibility measuring device based on enhanced Moses effect |
| CN101603946A (en) * | 2009-07-14 | 2009-12-16 | 中国科学院水利部成都山地灾害与环境研究所 | Tillage erosion measurement magnetism tracer method |
| CN205825948U (en) * | 2016-05-26 | 2016-12-21 | 中交第一航务工程局有限公司 | Marine jackstone dike sedimentation and the measurement apparatus of jackstone thickness |
| CN207832791U (en) * | 2018-01-29 | 2018-09-07 | 北京师范大学 | Soil loss monitoring device |
| CN108535454A (en) * | 2018-07-10 | 2018-09-14 | 北京师范大学 | A kind of soil erosion test system and method |
Non-Patent Citations (1)
| Title |
|---|
| (WANG, Shidong et al.) (Application of High -precision Magnetic Measurement Analytical Continuation Algorithm in the Dump Stability Evaluation)'(Science and Technology of West China) Vol.09, No. 26, 30 September 2010, ISSN: 1671-6396 entire document * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109115104A (en) | 2019-01-01 |
| CN109115104B (en) | 2020-04-14 |
| GB202003689D0 (en) | 2020-04-29 |
| GB2583409B (en) | 2023-02-08 |
| WO2020082475A1 (en) | 2020-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mattia et al. | A comparison between soil roughness statistics used in surface scattering models derived from mechanical and laser profilers | |
| CN104501766B (en) | Deep foundation pit excavation slope vertical displacement vector angle monitoring parameter and early warning method | |
| US9568489B2 (en) | Three-dimensional flow velocity vector, energy and mass gauge | |
| CN108680490B (en) | Device and method for detecting corrosion degree of reinforced concrete foundation steel bars of iron tower | |
| CN107817207B (en) | Method for calculating foundation pit permeability coefficient and automatic monitoring device thereof | |
| GB2583409A (en) | Measurement method for measuring thickness of soil layer based on magnetic susceptibility | |
| CN112900504B (en) | Method and system for identifying water leakage of waterproof curtain of foundation pit | |
| CN101581686A (en) | Method for monitoring growth of soil mass crack | |
| CN112326785A (en) | Synchronous grouting filling effect impact mapping method detection and evaluation method | |
| Rocchi et al. | A new technique for deep in situ measurements of soil water retention behaviour | |
| CN203732000U (en) | Digital display type topsoil depth measuring rule | |
| CN203981124U (en) | Ship lock structural strain and stress distribution formula optical fiber monitoring device | |
| CN109853578B (en) | Foundation pit structure with real-time monitoring and early warning functions and construction method thereof | |
| CN113433155B (en) | Real-time monitoring system and method for unfrozen water of roadbed in cold area | |
| CN202693257U (en) | Field multi-point soil wind erosion monitoring instrument | |
| CN112254764B (en) | System and method for rapidly positioning and monitoring dam leakage channel | |
| CN209639903U (en) | Hydrostatic level apparatus for testing weeping | |
| CN106404161B (en) | Calculation method for accurately positioning tunnel construction vibration position | |
| CN114858720A (en) | Photoelectric test system and method for in-situ frozen soil ice water component identification and dynamic tracing | |
| CN207408270U (en) | A kind of original position rainfall infiltration and runoff distribution measuring system | |
| CN102087093B (en) | Method for detecting soil mass cracking depth and detection device | |
| Hopman et al. | How to create a smart levee | |
| Segalini et al. | Role of geotechnical monitoring: state of the art and new perspectives | |
| CN207751437U (en) | A kind of distributed strain measuring instrument based on coaxial cable Bragg sensor | |
| CN206321641U (en) | Soil erosion position monitor equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20230508 |