A Frequency-Domain Electromagnetic Induction Exploration Method for Estimating Three-Dimensional Flow Characteristics of Groundwater
A three-dimensional flow, electromagnetic induction technology, applied in electric/magnetic exploration, water resources assessment, climate sustainability, etc., can solve the problems of inability to estimate groundwater flow, limited exploration depth, and heavy workload of power supply electrodes.
Inactive Publication Date: 2021-04-27
CENT SOUTH UNIV
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Problems solved by technology
This method has the characteristics of high precision, but in the actual exploration, because of the need to find the equipotential point, it needs to conduct multiple surveys of multiple measuring points in order to find the real equipotential point, so its exploration efficiency is low. In addition, the environmental adaptability of this method is weak, and it is difficult to meet the groundwater exploration work in exploration areas with steep terrain, vegetation development, and many buildings.
In addition, this method cannot estimate the flow of groundwater
[0009] The conduction electricity method is used to estimate the flow characteristics of groundwater. If only the flow characteristics of groundwater in a certain layer are estimated, the conduction electricity method is more convenient. However, if the three-dimensional characteristics of groundwater are estimated, the conduction electricity method needs to arrange different locations. Power supply electrodes, and if it is necessary to estimate the groundwater at a large depth, the workload of arranging power supply electrodes is relatively large, and the exploration depth is limited
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[0033] Refer to the following figure 1 , figure 2 , the present invention will be further described in conjunction with specific embodiments.
[0034] according to figure 1 The steps in the flow chart of a frequency-domain electromagnetic induction prospecting method for estimating the three-dimensional flow characteristics of groundwater as shown implement the method, and the specific steps are as follows:
[0035] a) if figure 2 As shown in , select the exploration area where groundwater flow characteristics need to be estimated, and arrange three measuring electrodes (such as figure 2 1 / 2 / 3 of the measuring electrodes) (and the 3 measuring electrodes are not in a straight line) and 2 power supply electrodes (such as figure 2 A and B in), and obtain the measurement electrodes (such as figure 2 1 / 2 / 3 measuring electrodes) and power supply electrodes (such as figure 2 In the coordinates of A and B), the coordinates of the measuring electrode are (CXi, CYi) (as show...
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A frequency-domain electromagnetic induction exploration method for estimating the three-dimensional flow characteristics of groundwater. This method adds easily soluble minerals (such as salt) to the part connected to the groundwater, and transmits electrical signals of multiple frequencies through two power supply electrodes. Carry out frequency-domain electromagnetic induction exploration on at least 3 measuring electrodes, detect the change of resistivity in the exploration area before and after adding soluble substances, use relevant formulas to estimate the horizontal flow direction, flow velocity amplitude, and flow rate of groundwater in three-dimensional space, and It is judged whether there is obvious vertical movement of groundwater, so as to obtain the three-dimensional flow characteristics of groundwater. This method has the advantages of rapidity, non-destructiveness, and low cost, and is suitable for estimating the characteristics of horizontal flow direction, flow velocity, and flow rate in three-dimensional space for groundwater with exposed parts upstream.
Description
technical field [0001] The invention relates to a frequency-domain electromagnetic induction electrical method for estimating three-dimensional flow characteristics of groundwater in the field of geophysics. The method can realize the estimation of three-dimensional flow characteristics such as horizontal flow direction, flow velocity and flow rate of groundwater with exposed parts upstream. Background technique [0002] At present, the regional groundwater flow field mainly considers the overall height difference of the regional terrain, and judges the groundwater flow direction according to the relevant geological environment atlas. The accuracy of the groundwater flow direction judged by this method is low, and it is generally only used as a rough and rough representation of the regional groundwater flow field. gender discrimination method. [0003] The flow characteristics of the local groundwater, such as the flow direction, are mainly judged by drilling observation wel...
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IPC IPC(8): G01V3/08G01D21/02
CPCG01D21/02G01V3/081Y02A90/30
Inventor 刘春明曹创华刘嵘汪鑫强薛建强
Owner CENT SOUTH UNIV