Frequency domain electromagnetic induction exploration method for estimating three-dimensional flow characteristics of underground water
A three-dimensional flow, electromagnetic induction technology, applied in electrical/magnetic exploration, water resource assessment, geophysical measurement, etc., can solve problems such as difficult to meet groundwater exploration work, large workload of power supply electrodes, and many exploration depth restrictions.
Inactive Publication Date: 2020-05-19
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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The invention discloses a frequency domain electromagnetic induction exploration method for estimating three-dimensional flow characteristics of underground water. The method comprises the following steps: adding soluble minerals (such as edible salt) to a part connected with underground water; electric signals with multiple frequencies are transmitted through the two power supply electrodes; frequency domain electromagnetic induction exploration is carried out on at least three measuring electrodes. The resistivity change conditions of an exploration area before and after addition of solublesubstances are detected, the horizontal flow direction, the flow velocity amplitude and the flow of a three-dimensional space of underground water are estimated by adopting related formulas, and whether the underground water has obvious vertical motion or not is judged, so that the three-dimensional flow characteristic of the underground water is obtained. The method has the advantages of quickness, no damage, low cost and the like, and is suitable for estimating the horizontal flow direction, the flow velocity, the flow rate and other characteristics of the three-dimensional space of the underground water with the exposed part at the 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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Login to View More 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