Method and device for detecting underground water in cliff mountain

Abstract

The invention belongs to the technical field of geophysics, and particularly discloses a cliff mountain groundwater detection method and device, and the method comprises the steps: presetting a plurality of measurement points which are arranged in an array manner and are sequentially sorted in the row direction on the cliff wall of a cliff, and presetting a plurality of equidistant inversion points which are sequentially sorted in the mountain of the cliff from each measurement point; according to the apparent resistivity of each inversion point, a water-containing inversion point is determined from the multiple inversion points, and a measuring point corresponding to the water-containing inversion point is a water-containing measuring point; determining the coordinate value of the water-containing measuring point according to the serial number of the water-containing measuring point, and determining the coordinate value of the water-containing inversion point according to the coordinate value of the water-containing measuring point, the serial number of the water-containing inversion point and the coordinate value of the boundary inversion point corresponding to the water-containing inversion point; and drawing a distribution map of underground water in the mountain according to the coordinate values of the water-containing inversion points. According to the coordinate values of the boundary measuring points and the boundary inversion points, the coordinate values of the measuring points and the inversion points required for drawing the distribution map can be determined, the data reading time is greatly shortened, and the underground water distribution map drawing efficiency is improved.

Description

Technical Field

[0001] The present invention discloses a method and device for detecting groundwater in steep cliff mountains, belonging to the field of geophysical technologies. Background Art

[0002] Groundwater is a non-renewable resource on which humans rely for survival, and it is particularly important to develop and utilize groundwater resources reasonably. Traditional groundwater detection is completed by professionals in geophysical exploration, geology, hydrology, etc. As an important means of geological exploration work, geophysical exploration plays a crucial role in the accurate detection of groundwater sources. Generally, finding groundwater through geophysical methods mainly involves carrying out geophysical work on the ground surface and analyzing and inferring the distribution of groundwater based on the collected data. However, in the actual process of finding water, the ground surface is often complex, with undulating mountains and numerous steep cliffs, and at the same time, the water resources in these places are quite rich. It is almost impossible to carry out geophysical work on the ground surface.

[0003] The commonly used method for current geophysical exploration is airborne geophysical exploration. On the one hand, the cost of airborne geophysical exploration is quite high, and the detection accuracy is significantly insufficient compared to surface geophysical exploration. On the other hand, due to airspace jurisdiction restrictions, the difficulty of aviation operations is relatively large. This results in the inapplicability of airborne geophysical exploration to the detection of water resources in areas with undulating mountains and numerous steep cliffs. In addition, when using the data obtained from airborne geophysical exploration to draw a groundwater distribution map in the prior art, there are technical problems such as slow data reading and long reading time, resulting in low efficiency in drawing the groundwater distribution map. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for detecting groundwater in steep cliff mountains to solve the technical problems of high cost, low efficiency, and low accuracy existing in the existing methods for detecting groundwater in steep cliff mountains.

[0005] The first aspect of the present invention provides a method for detecting groundwater in steep cliff mountains, including:

[0006] Presetting a plurality of measurement points arranged in an array and sequentially sorted along the row direction on the cliff wall of the steep cliff, and presetting a plurality of equally spaced and sequentially sorted inversion points along each measurement point into the mountain body of the steep cliff.

[0007] Determining water-bearing inversion points from the plurality of inversion points according to the apparent resistivity of each inversion point, and the measurement points corresponding to the water-bearing inversion points are water-bearing measurement points.

[0008] Determining the coordinate values of the water-bearing measurement points according to the serial numbers of the water-bearing measurement points, and determining the coordinate values of the water-bearing inversion points according to the coordinate values of the water-bearing measurement points, the serial numbers of the water-bearing inversion points, and the coordinate values of the corresponding boundary inversion points of the water-bearing inversion points.

[0009] Drawing a distribution map of groundwater in the mountain body according to the coordinate values of the water-bearing inversion points.

[0010] Preferably, the coordinate values are determined according to the serial numbers of the water content measurement points, specifically including:

[0011] According to the coordinate values of the two boundary measurement points in the row where the water content measurement point is located and the serial number of the water content measurement point, the coordinate value of the water content measurement point is determined.

[0012] Preferably, the coordinate value of the water content inversion point is determined according to the coordinate value of the water content measurement point, the serial number of the water content inversion point, and the coordinate value of the boundary inversion point corresponding to the water content inversion point, specifically including:

[0013] Obtain the distance between the boundary inversion point and the corresponding water content measurement point and the distance between two adjacent inversion points.

[0014] According to the distance, the spacing, the coordinate value of the water content measurement point, the serial number of the water content inversion point, and the coordinate value of the boundary inversion point corresponding to the water content inversion point, the coordinate value of the water content inversion point is determined.

[0015] Preferably, before drawing the distribution map of the groundwater in the mountain body according to the coordinate value of the water content inversion point, it further includes:

[0016] If the distance between adjacent water content inversion points is less than the preset distance, apparent resistivity interpolation is performed between the adjacent water content inversion points according to the apparent resistivity of the adjacent water content inversion points.

[0017] Preferably, drawing the distribution map of the groundwater in the mountain body according to the coordinate value of the water content inversion point, specifically including:

[0018] Obtain the elevation of the water content inversion point.

[0019] Draw the distribution map of the groundwater in the mountain body according to the elevation and the coordinate value of the water content inversion point.

[0020] The second aspect of the present invention provides a device for detecting groundwater in a cliff mountain body based on the above-mentioned method for detecting groundwater in a cliff mountain body, including: a preset point position module, a detection module, a coordinate determination module, and a drawing module.

[0021] The preset point position module is used to preset a plurality of measurement points arranged in an array and sequentially sorted along the row direction on the cliff wall of the cliff, and preset a plurality of equidistant and sequentially sorted inversion points along each measurement point into the mountain body of the cliff.

[0022] The detection module is used to determine the water content inversion points from a plurality of inversion points according to the apparent resistivity of each inversion point, and the measurement point corresponding to the water content inversion point is the water content measurement point.

[0023] The coordinate determination module is used to determine the coordinate value according to the serial number of the water content measurement point, and determine the coordinate value of the water content inversion point according to the coordinate value of the water content measurement point, the serial number of the water content inversion point, and the coordinate value of the boundary inversion point corresponding to the water content inversion point.

[0024] The drawing module is used to draw the distribution map of groundwater in the mountain body according to the coordinate values of the water content inversion points.

[0025] Preferably, the detection module includes a wire frame, a transient electromagnetic instrument, a transmitting and receiving coil, and a traction unit.

[0026] The transmitting and receiving coil is arranged along the wire frame and is connected to the transient electromagnetic instrument.

[0027] The traction unit is arranged on the wire frame and is used to change the position of the wire frame on the cliff wall.

[0028] Preferably, the traction unit includes a first traction rope and a second traction rope.

[0029] The first traction rope and the second traction rope are arranged on opposite sides of the wire frame.

[0030] The number of the first traction ropes is two.

[0031] Preferably, the detection module further includes a support unit.

[0032] The support unit is arranged inside the wire frame and is connected to the wire frame.

[0033] Preferably, the detection module further includes a mobile terminal.

[0034] The mobile terminal is wirelessly connected to the transient electromagnetic instrument.

[0035] The method and device for detecting groundwater in steep cliff mountain bodies of the present invention have the following beneficial effects compared with the prior art:

[0036] The device for detecting groundwater in steep cliff mountain bodies of the present invention can be attached to the cliff wall of the steep cliff, so as to obtain accurate apparent resistivity. At the same time, the device is simple, easy to operate, and low in cost. After obtaining the accurate apparent resistivity, further combined with the method for detecting groundwater in steep cliff mountain bodies of the present invention, the distribution of groundwater can be quickly and accurately drawn. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flowchart of the method for detecting groundwater in steep cliff mountain bodies according to an embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram of the measuring point position according to an embodiment of the present invention.

[0039] Figure 3 It is a schematic diagram of the inversion point position according to an embodiment of the present invention.

[0040] Figure 4This is a schematic diagram of the detection module when the transient electromagnetic instrument is placed above the cliff wall in the embodiment of the present invention.

[0041] Figure 5 This is a schematic diagram of the detection module when the transient electromagnetic instrument is placed at the bottom of the cliff in the embodiment of the present invention.

[0042] Figure 6 This is a layout diagram of the device for groundwater detection of a steep cliff in a certain place in Henan in the specific embodiment of the present invention.

[0043] Figure 7 This is the transient electromagnetic profile result diagram obtained in the specific embodiment of the present invention.

[0044] Figure 8 This is the three-dimensional front view slice diagram of the groundwater distribution obtained in the specific embodiment of the present invention.

[0045] Figure 9 This is the three-dimensional solid slice diagram of the groundwater distribution obtained in the specific embodiment of the present invention.

[0046] Figure 10 This is the three-dimensional result diagram of the groundwater distribution obtained in the specific embodiment of the present invention.

[0047] Figure 11 This is the three-dimensional geological model diagram of the steep cliff in a certain place in Henan in the specific embodiment of the present invention.

[0048] Figure 12 This is the apparent resistivity slice diagram at different heights below the surface of the mountain body of the steep cliff in a certain place in Henan obtained by using the airborne transient electromagnetic method in the specific embodiment of the present invention.

[0049] In the figure: 1 is a wire frame; 2 is a transient electromagnetic instrument; 3 is a transmitting and receiving coil; 4 is a first towing rope; 5 is a second towing rope; 6 is a support unit. Specific Embodiment

[0050] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0051] The first aspect of the embodiment of the present invention provides a method for detecting groundwater in a steep cliff mountain body, as Figure 1 shown, including:

[0052] Step 1: Preset a plurality of measurement points arranged in an array and sequentially sorted along the row direction on the cliff wall of the steep cliff, and preset a plurality of equally spaced and sequentially sorted inversion points from each measurement point into the mountain body of the steep cliff.

[0053] In the embodiments of the present invention, a plurality of measuring points are preset on the cliff wall of a steep cliff, such as Figure 2 and Figure 3 shown. Each row of measuring points forms a measuring line. Correspondingly, a plurality of equally spaced and sequentially sorted inversion points are preset from each measuring point into the mountain body of the steep cliff.

[0054] Step 2: Determine the water-bearing inversion points from the plurality of inversion points according to the apparent resistivity of each inversion point. The measuring point corresponding to the water-bearing inversion point is a water-bearing measuring point.

[0055] Based on the characteristic that the resistivity of groundwater is significantly less than that of mountain rocks, in the embodiments of the present invention, the detection module obtains the apparent resistivity of the corresponding plurality of inversion points of each measuring point via each measuring point, and further records the inversion points with an apparent resistivity less than a preset threshold as water-bearing inversion points. Correspondingly, as long as there is a water-bearing inversion point, the embodiments of the present invention record the measuring point corresponding to the water-bearing inversion point as a water-bearing measuring point.

[0056] The above preset threshold is 100 Ω·m to 300 Ω·m.

[0057] Step 3: Determine the coordinate value of the water-bearing measuring point according to the serial number of the water-bearing measuring point, and determine the coordinate value of the water-bearing inversion point according to the coordinate value of the water-bearing measuring point, the serial number of the water-bearing inversion point, and the coordinate value of the boundary inversion point corresponding to the water-bearing inversion point. Specifically, it includes:

[0058] Step 3.1: Determine the coordinate value of the water-bearing measuring point according to the serial number of the water-bearing measuring point. Specifically, it includes:

[0059] Determine the coordinate value of the water-bearing measuring point according to the coordinate values of the two boundary measuring points in the row where the water-bearing measuring point is located and the serial number of the water-bearing measuring point.

[0060] In the embodiments of the present invention, according to the geodetic coordinate system, the coordinate values of the two boundary measuring points in the row where the water-bearing measuring point is located are determined and denoted as P 1 (x 1 ,y 1 ) and P n (x n ,y n ). Then, the abscissa value of the water-bearing measuring point is determined according to formula (1):

[0061]

[0062] In the formula, Po x is the abscissa value of the water-bearing measuring point, x 1 is the abscissa value of the first boundary measuring point, x n is the abscissa value of the second boundary measuring point, k is the distance between adjacent two measuring points (i.e., the point distance in Figure 2 ), D is the distance between the two boundary measuring points, and o is the serial number of the water-bearing measuring point.

[0063] The ordinate value of the above water content measurement point is determined according to formula (2):

[0064]

[0065] In the formula, Po y is the ordinate value of the water content measurement point, y 1 is the ordinate value of the first boundary measurement point, y n is the ordinate value of the second boundary measurement point, k is the distance between two adjacent measurement points (i.e., the point distance in Figure 2 ), D is the distance between the two boundary measurement points, and o is the serial number of the water content measurement point.

[0066] Step 3.2: Determine the coordinate value of the water content inversion point according to the coordinate value of the water content measurement point, the serial number of the water content inversion point, and the coordinate value of the corresponding boundary inversion point of the water content inversion point, specifically including:

[0067] Step 3.2.1: Obtain the distance between the boundary inversion point and the corresponding water content measurement point, and the distance between two adjacent inversion points.

[0068] In the embodiment of the present invention, the inversion point farthest from the water content measurement point among the multiple inversion points corresponding to the water content measurement point is denoted as the boundary inversion point, and the coordinates P G (x G , y G ) of the boundary inversion point are obtained. In the embodiment of the present invention, the distance between the boundary inversion point and the corresponding water content measurement point is denoted as M, and the distance between two adjacent inversion points is denoted as s.

[0069] Step 3.2.2: Determine the coordinate value of the water content inversion point according to the distance, the distance between two adjacent inversion points, the coordinate value of the water content measurement point, the serial number of the water content inversion point, and the coordinate value of the corresponding boundary inversion point of the water content inversion point. Among them, the abscissa value of the water content inversion point is shown in formula (3):

[0070]

[0071] In the formula, PQ x is the abscissa value of the water content inversion point, Po x is the abscissa value of the water content measurement point, x G is the abscissa value of the boundary inversion point, s is the distance between two adjacent inversion points corresponding to a water content measurement point, M is the distance between the boundary inversion point and the corresponding water content measurement point, and Q is the serial number of the water content inversion point.

[0072] In the embodiment of the present invention, the ordinate value of the water content inversion point is shown in formula (4):

[0073]

[0074] Wherein, PQ y is the ordinate value of the water content inversion point, Po y is the ordinate value of the water content measurement point, y G is the ordinate value of the boundary inversion point, s is the distance between two adjacent inversion points corresponding to a water content measurement point, M is the distance between the boundary inversion point and the corresponding water content measurement point (i.e., the distance between EZ in Figure 3 ), and Q is the serial number of the water content inversion point.

[0075] Step 4: Draw a distribution map of groundwater in the mountain body according to the coordinate values of the water content inversion points.

[0076] According to Formula (3) and Formula (4) in the embodiment of the present invention, a distribution map of groundwater in the mountain body can be drawn, and the coordinates of each inversion point where there is no groundwater are also obtained with reference to Formula (3) and Formula (4).

[0077] To increase the smoothness of the drawn groundwater distribution map, before drawing, the embodiment of the present invention further includes: judging the distance between adjacent water content inversion points. If the distance between adjacent water content inversion points is less than a preset distance, perform apparent resistivity interpolation between adjacent water content inversion points according to the apparent resistivity of adjacent water content inversion points. The interpolation method in the embodiment of the present invention is preferably Kriging interpolation.

[0078] To more conveniently observe the distribution of groundwater in the steep cliff mountain body, a three-dimensional groundwater distribution map can also be drawn. Specifically, obtain the elevation of the water content inversion point; draw a distribution map of groundwater in the mountain body according to the elevation and the coordinate values of the water content inversion points.

[0079] The elevation in the embodiment of the present invention can be obtained during on-site detection. Since the measurement points of the present invention are arranged in an array, the elevation of each row of measurement points and the inversion points corresponding to the measurement points in this row are the same.

[0080] When drawing a groundwater distribution map of a steep cliff mountain body, according to the coordinate values of the boundary measurement points and the boundary inversion points, the coordinate values of each measurement point and inversion point required for drawing the distribution map can be determined, without reading the coordinates of each measurement point and each inversion point one by one, greatly shortening the data mapping time and improving the efficiency of drawing the groundwater distribution map.

[0081] The second aspect of the present invention provides a steep cliff mountain body groundwater detection device based on the above-mentioned steep cliff mountain body groundwater detection method, including: a preset point module, a detection module, a coordinate determination module, and a drawing module.

[0082] Among them, the preset point module is used to preset a plurality of measurement points arranged in an array and sorted in sequence along the row direction on the cliff wall of the steep cliff, and preset a plurality of equally spaced and sequentially sorted inversion points into the mountain body of the steep cliff along each measurement point. The detection module is used to determine the water-containing inversion points from the plurality of inversion points according to the apparent resistivity of each inversion point, and the measurement point corresponding to the water-containing inversion point is the water-containing measurement point. The coordinate determination module is used to determine its coordinate value according to the serial number of the water-containing measurement point, and determine the coordinate value of the water-containing inversion point according to the coordinate value of the water-containing measurement point, the serial number of the water-containing inversion point, and the coordinate value of the boundary inversion point corresponding to the water-containing inversion point. The drawing module is used to draw the distribution map of groundwater in the mountain body according to the coordinate value of the water-containing inversion point.

[0083] To improve the accuracy of the drawn distribution map of groundwater in the steep cliff mountain body, the detection module in the embodiment of the present invention is a module based on the transient electromagnetic method, and the structure of the detection module is as Figure 4 shown, including a wire frame 1, a transient electromagnetic instrument 2, a transceiver coil 3 and a traction unit; wherein the transceiver coil 3 is arranged along the wire frame 1 and is connected to the transient electromagnetic instrument 2; the transceiver coil 3 includes a transmitting coil and a receiving coil, both of which are arranged along the wire frame 1; the traction unit is arranged on the wire frame 1 and is used to change the position of the wire frame 1 on the cliff wall. The wire frame 1 in the embodiment of the present invention is a high-strength non-metallic wire frame.

[0084] Since the detection module in the embodiment of the present invention adopts a frame structure, it fits well with the vertical surface of the cliff wall, can ensure the data quality, and can solve the problems that geophysical exploration on the surface cannot be carried out due to the steep terrain and the detection accuracy of airborne geophysical exploration is far from enough.

[0085] The present invention uses the traction unit to tow the wire frame 1, and the entire detection model can be moved to the specified position as needed, which is suitable for detecting water sources in the mountain body with a cliff height less than 100m and has a low cost.

[0086] To ensure the stability of the moving process, the traction unit in the embodiment of the present invention includes a first traction rope 4 and a second traction rope 5; the first traction rope 4 and the second traction rope 5 are arranged on opposite sides of the wire frame 1; the number of the first traction ropes 4 is 2.

[0087] The first traction rope 4 in the embodiment of the present invention stretches towards the top of the cliff and is used to move the wire frame 1 horizontally or vertically; the second traction rope 5 stretches towards the bottom of the cliff and is used to realize the swing fine adjustment of the wire frame 1.

[0088] To improve the stability of the detection module itself, the detection module in the embodiment of the present invention further includes a support unit 6; the support unit 6 is arranged inside the wire frame 1 and is connected to the wire frame 1. The support unit 6 in the embodiment of the present invention is a high-strength non-metallic support rod.

[0089] To facilitate the control of the transient electromagnetic instrument 2, the detection module of the present invention further includes a mobile terminal, which is wirelessly connected to the transient electromagnetic instrument 2.

[0090] The working process of the detection module of the present invention is as follows:

[0091] (1) Conduct on-site reconnaissance according to the task content. When using the detection module to detect groundwater through the cliff wall, a comprehensive on-site reconnaissance should be carried out. Reasonably select the line spacing and point spacing according to the geophysical exploration industry, relevant specifications, and accuracy requirements. The coverage range EFGH of the measuring points should be larger than the range to be measured. For the convenience of later result display, in the embodiment of the present invention, the long side direction is defined as the measuring line direction, the distance between two adjacent measuring lines is defined as the line spacing, and the distance between two adjacent measuring points in each measuring line is defined as the point spacing, as Figure 2 shown.

[0092] (2) Select a favorable data acquisition method. When there is water under the cliff wall, the terrain is steep or there are other factors unsuitable for instrument layout, choose to place the transient electromagnetic instrument 2 above the cliff wall, as Figure 4 shown; when the terrain under the cliff wall is dry and flat and the working surface is large, choose to place the transient electromagnetic instrument 2 under the cliff wall, as Figure 5 shown.

[0093] (3) Clear the obstacles on the cliff wall: Generally, shrubs and weeds grow at the position where the free end of the first tow rope 4 is pulled by the staff at the top of the cliff wall. It needs to be cleared before formal measurement. Prevent the tow rope from being blocked during the translation process.

[0094] (4) Device layout: According to the conditions of the bottom and top of the cliff wall of each measuring line on site, the transient electromagnetic instrument 2 can be selected to be arranged at the bottom or top of the cliff wall. Press the wire frame 1 with the transceiver coil 3 flat against the cliff wall, and keep the top and bottom edges of the coil horizontal.

[0095] (5) When the wire frame 1 is arranged in the established position, that is, the geometric center of the wire frame 1 coincides with the measuring point, the acquisition personnel perform data acquisition and storage through the mobile terminal. The on-site data acquisition sequence can be completed in sequence along the measuring line direction. After the current measuring line is completed, the measurement of the next measuring line is carried out, or it can be measured in sequence along the direction perpendicular to the measuring line, that is, when the 1st measuring points of all measuring lines are completed, then the 2nd measuring points of all measuring lines are measured, and so on in sequence. When the cliff wall is smooth and easy to move, the first sequence is preferred. When there are many obstacles on the cliff wall and it is difficult to clean, the second sequence is preferred to improve work efficiency.

[0096] (6) Perform inversion processing on all the measuring point data collected, so as to obtain the apparent resistivity at different depths of each measuring point, that is, obtain the apparent resistivity values corresponding to multiple inversion points for each measuring point.

[0097] (7) Based on the field records, the apparent resistivity data of the same elevation measuring point are summarized and interpolated to form a two-dimensional profile. The two-dimensional profile reflects the resistivity characteristics of the cross-section of a mountain at a certain elevation.

[0098] (8) The survey line data at different elevations are aggregated and interpolated to form a three-dimensional result map. The three-dimensional map reflects the apparent resistivity distribution characteristics of the underground medium in the entire detection space.

[0099] (9) Based on the three-dimensional apparent resistivity and the apparent resistivity of groundwater, the spatial distribution of groundwater can be inferred, and the groundwater range, water flow channels and other characteristics can be delineated.

[0100] In order to verify the effectiveness of the steep cliff mountain underground detection method and device of the present invention, the embodiment of the present invention is based on the source water detection in Henan Province, and the method is used for the first time to find out the distribution of groundwater in the steep cliff mountain. Figure 6 The water outlet W is the main spring location, and there are other water outlets next to it. The spring is located in the scenic area, and it is considered not to affect the actual landscape of the scenic area, so as to achieve the purpose of rational development of water resources. Before the design work is carried out, it is necessary to find out the distribution of springs in the mountain and the main channels, and use non-destructive geophysical methods for detection.

[0101] According to the detection requirements, survey lines were laid out within 100 meters upstream and downstream of the main spring, and 5 survey lines were laid out from top to bottom on the cliff according to the on-site terrain conditions. The line spacing was 4m and the point spacing was 2m. The top acquisition and bottom acquisition were combined during the measurement. Due to the large number of rock wall obstacles, the wireframe 1 movement method was selected to move along the direction of the measurement point, and a total of 357 measurement points were actually completed.

[0102] Due to the limitations of on-site conditions, some measurement points could not be completed during the actual data collection process, and the measurement direction was from east to west. The collected single-point data was processed and a two-dimensional profile result map was drawn to obtain the transient electromagnetic profile results. Figure 5 Article, such as Figure 7 As shown: the actual completed length and relative position of each survey line are rearranged. The blue low resistivity anomaly area in the profile results is the mainstream channel of the spring water. No anomaly was found in line 1, and there were obvious low-resistance anomalies in lines 2, 3, 4 and 5. The location of the channel can be accurately determined in the profile. Line 1 has the highest elevation, and it is inferred that there is no groundwater channel at this elevation. In order to more intuitively judge the spatial extension of the spring channel in the mountain. Convert the two-dimensional coordinates to three-dimensional coordinates for three-dimensional data mapping. For coordinate replacement, select the CGCS2000 geodetic coordinate system and the 1985 national benchmark elevation. In the two-dimensional results, the elevation of transient electromagnetic line 1 is 395.1m, and no anomalies were found. It is inferred that the water level is lower than this elevation. Use the data of lines 2 to 5 to draw a three-dimensional map as shown Figures 8 to 10 As shown. Further, a three-dimensional geological model map can be drawn, such as Figure 11 shown.

[0103] Figure 12 In a specific embodiment of the present invention, an apparent resistivity slice map at different depths below the surface of a cliff mountain in a certain area of Henan is obtained by using the airborne transient electromagnetic method.

[0104] Based on the above results, the following conclusions can be drawn:

[0105] (1) The resistivity of the rocks in the study area is relatively uniform, mainly composed of limestone, with local fractures developed. These fractures become the main water-conducting channels for springs, and there are five main low-resistivity anomalies. A large low-resistivity area appears in the east of the survey area, where the fractures are relatively developed. The resistivity is also relatively low near the main spring eye and extends deep into the cliff wall.

[0106] The coordinate ranges of the five spring points are as follows:

[0107] ① (407803, 3914746) to (407798, 3914744);

[0108] ② (407768, 3914718) to (407770, 3914709);

[0109] ③ (407770, 3914709) to (407772, 3914702);

[0110] ④ (407758, 3914692) to (407733, 3914673);

[0111] ⑤ (407733, 3914673) to (407726, 3914668).

[0112] (2) It can be seen from the three-dimensional imaging results that the overall flow direction of the spring water is from east to west and extends to the position of the main spring eye. There is a water-conducting fracture channel about 40 m deep.

[0113] (3) No obvious low-resistivity anomaly is seen within 100 m downstream of the main spring eye. It is speculated that the rock mass in this range is intact and there is no main spring channel.

[0114] (4) The resolution of the airborne geophysical exploration results is relatively low, and small anomaly ranges cannot be detected, and the detection accuracy is far from enough.

[0115] By comparing the outlet of the detected spring channel with the positions of several outlets already discovered on the surface in the present invention, the planar error is within 50 cm, indicating the reliability of the detection method.

[0116] The groundwater detection device for steep cliff mountains of the present invention can be attached to the cliff wall of the steep cliff, so as to obtain accurate apparent resistivity. At the same time, the device is simple, easy to operate and low in cost. After obtaining the accurate apparent resistivity, further combined with the groundwater detection method for steep cliff mountains of the present invention, the distribution of groundwater can be quickly and accurately mapped.

[0117] The above are only several embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, making some changes or modifications using the above-disclosed technical content is equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A method for detecting groundwater in a steep mountain, characterized in that: include: On the cliff wall of the steep cliff, a plurality of measuring points arranged in an array and arranged in sequence along the row direction are preset, and along each measuring point, a plurality of inversion points that are equidistant and arranged in sequence are preset in the mountain body of the steep cliff; According to the apparent resistivity of each inversion point, a water-containing inversion point is determined from a plurality of inversion points, and the measuring point corresponding to the water-containing inversion point is the water-containing measuring point; Determine the coordinate value of the water-bearing measuring point according to its serial number, and determine the coordinate value of the water-bearing inversion point according to the coordinate value of the water-bearing measuring point, the serial number of the water-bearing inversion point and the coordinate value of the boundary inversion point corresponding to the water-bearing inversion point; A distribution map of groundwater in the mountain is drawn according to the coordinate values ​​of the water-bearing inversion points.

2. The method for detecting groundwater in a steep cliff mountain according to claim 1, characterized in that: Determine the coordinate value according to the serial number of the water-containing measuring point, including: The coordinate value of the water-containing measuring point is determined based on the coordinate values ​​of the two boundary measuring points in the row where the water-containing measuring point is located and the serial number of the water-containing measuring point.

3. The method for detecting groundwater in a steep cliff mountain according to claim 1, characterized in that: The coordinate value of the water-bearing inversion point is determined according to the coordinate value of the water-bearing measuring point, the serial number of the water-bearing inversion point and the coordinate value of the boundary inversion point corresponding to the water-bearing inversion point, specifically including: Obtain the distance between the boundary inversion point and the corresponding water-bearing measuring point and the distance between two adjacent inversion points; The coordinate value of the water-bearing inversion point is determined according to the distance, the spacing, the coordinate value of the water-bearing measuring point, the serial number of the water-bearing inversion point and the coordinate value of the boundary inversion point corresponding to the water-bearing inversion point.

4. The method for detecting groundwater in a steep cliff mountain according to claim 1, characterized in that: Before drawing the distribution map of groundwater in the mountain according to the coordinate values ​​of the water-bearing inversion points, the method further includes: If the distance between adjacent water-bearing inversion points is less than the preset distance, the apparent resistivity interpolation is performed between the adjacent water-bearing inversion points according to the apparent resistivity of the adjacent water-bearing inversion points.

5. The method for detecting groundwater in a steep cliff mountain according to claim 1, characterized in that: Drawing a distribution map of groundwater in the mountain according to the coordinate values ​​of the water-bearing inversion points specifically includes: Obtaining the elevation of the water-containing inversion point; A distribution map of groundwater in the mountain is drawn according to the elevation and the coordinate values ​​of the water-containing inversion points.

6. A device for detecting groundwater in a steep cliff mountain based on the method for detecting groundwater in a steep cliff mountain according to any one of claims 1 to 5, characterized in that: It includes a preset point module, a detection module, a coordinate determination module and a drawing module; The preset point module is used to preset a plurality of measuring points arranged in an array and sequentially arranged along the row direction on the cliff wall of the steep cliff, and to preset a plurality of inversion points that are equidistant and sequentially arranged along each measuring point into the mountain body of the steep cliff; The detection module is used to determine a water-containing inversion point from multiple inversion points according to the apparent resistivity of each inversion point, and the measuring point corresponding to the water-containing inversion point is the water-containing measuring point; The coordinate determination module is used to determine the coordinate value of the water-containing measuring point according to its serial number, and determine the coordinate value of the water-containing inversion point according to the coordinate value of the water-containing measuring point, the serial number of the water-containing inversion point and the coordinate value of the boundary inversion point corresponding to the water-containing inversion point; The drawing module is used to draw the distribution map of groundwater in the mountain according to the coordinate values ​​of the water-containing inversion points.

7. The device for detecting groundwater in a steep cliff mountain according to claim 6, characterized in that: The detection module includes a wire frame, a transient electromagnetic instrument, a transceiver coil and a traction unit; The transceiver coil is arranged along the wire frame and connected to the transient electromagnetic instrument; The traction unit is arranged on the wire frame and is used for changing the position of the wire frame on the cliff wall.

8. The device for detecting groundwater in a steep cliff mountain according to claim 7, characterized in that: The traction unit includes a first traction rope and a second traction rope; The first traction rope and the second traction rope are arranged on opposite sides of the wire frame; The number of the first traction ropes is 2.

9. The device for detecting groundwater in a steep cliff mountain according to claim 7, characterized in that: The detection module also includes a supporting unit; The supporting unit is arranged inside the wire frame and connected to the wire frame.

10. The device for detecting groundwater in a steep cliff mountain according to claim 7, characterized in that: The detection module also includes a mobile terminal; The mobile terminal is wirelessly connected to the transient electromagnetic instrument.

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