There are many influencing factors for water measurement by Tiandian method, the graphics are very complex, each map is different, and the geological anomalies are also diverse. There are both transverse and longitudinal anomalies; There are both anomalies with good water content and anomalies with bad water content; There are both real anomalies and false anomalies. As long as you do your work at home, you can distinguish between them.
What does it take to get your work done at home? To put it simply, as long as there is a geological anomaly on the measuring line of a well drilling and water finder, two different retests should be done, one is the in-situ retest, and the other is the dislocation retest, each with its own role.
The function of in-situ retesting is to identify whether there is a true abnormality in the longitudinal direction. It is best to measure the diagram of the well drilling and water finder measured twice on a map, which can be seen at a glance. The 18 measurement points of the multi-channel instrument are sampled at the same time, but the map measured twice before and after is not sampled at the same time, and the interval between the two times is about seven or eight minutes, and the map measured twice can be regarded as "wrong time retest", it plays a role in that it can be seen that the black strip or horizontal high and low value layer that appears in the longitudinal direction is true or false, and the horizontal false anomaly caused by some interference signals is generally not reproduced at the same depth after "wrong time measurement". For example, in Figure 1, the horizontal high-value layers in the diagram of the two well-drilling and water finders are all in the same straight line, which is a real anomaly, and there may be interlayer variable layer water (the actual water is good).
For example, the faint black bands measured twice in Figure 2 are not in the same straight line, which is a false anomaly, and there will be no interlaminar variable laminar water. The more water-poor areas there are, the more likely the in-situ retest is to be inconsistent. If there are no common anomalies in the plot in both the horizontal and vertical directions, the line should be abandoned. If there are common anomalies in the transverse direction, it is also necessary to do a misalignment retest to identify its authenticity.
The function of the retest of the dislocation well drilling and water finder is to distinguish whether the anomaly in the transverse direction is a real anomaly, and whether it is a false anomaly caused by uneven soil thickness and other reasons, which can play the role of "mistime" and "dislocation". For example, in Figure 3, the above figure is an in-situ retest, and the two measurements are very consistent, and the contact bands of the high and low values are at 4 points. The following figure is a dislocation remeasurement map, the position has changed, the change law of soil thickness has changed, and the contact zone of high value and low value has changed from point 4 to point 2, indicating that point 4 and point 2 are unreal, they are false anomalies, and cannot be fixed.
If there is no horizontal high-value layer or low-value layer in the longitudinal direction, that is, there is no possibility of interlayer variable layer water, the in-situ retest of the well drilling and water finder can not be done. If there is no high-value anomaly or low-value anomaly that can be used laterally, the misalignment retest can also be omitted. But you need a lot of experience to do it, and if you don't have experience, you should do it at home. **Self** number, you can see it by clicking on my avatar)