Views: 6 Author: pqwt Publish Time: 2022-08-26 Origin: PQWT
An old well, the water pressed from it, the summer time is particularly cool, comparable to the refrigerator freezer ice water, the winter time but not ice, but a little warmer than ordinary tap water, so the question arises, why is this in the end?
Wells, since ancient times. In the countryside, in small towns, there are many wells, a sign that people use groundwater. Of course, well water can not be directly drunk (except for washing with), it contains a variety of impurities more, you must use alum and other after precipitation, before boiling and drinking. People who have used well water know that well water is "warm in winter and cool in summer".
Does the well water will automatically adjust the temperature? No, well water warm in winter and cool in summer is just a feeling we have, not well water itself really warm in winter and cool in summer. People feel that the well water is warm in winter and cool in summer is relative to the temperature on the ground at that time. In the hot summer, the surface of the earth is directly exposed to the sun and the influence of air currents, and the temperature rises quickly. The underground soil can only absorb heat from the atmosphere through the upper layer of soil, because the soil is very slow to transfer heat, so the temperature deep underground is lower than the temperature of the ground, so the temperature of the well water is lower than the temperature on the ground. If the well water is brought to the surface, it feels especially cold. The temperature on the ground drops quickly in the cold winter, and often the water on the surface of the lake below 0°C has to freeze.
Because the soil deep underground can not directly to the air heat, so the underground temperature does not change much, the temperature of the well water is also higher than the ground. This is when the water is brought to the surface to feel hotter. It is not only the well water will give the feeling of warm in winter and cool in summer. It is the groundwater, caves, cellars, are like this. People use this to store fruits and vegetables in the cellar in winter to prevent freezing, and in summer to preserve them. Drilling a well is a very in-depth technology. The main method of drilling a well is to find the underground water line. If you find the wrong place and you can't get water, it's a waste of energy. Now that technology has evolved, the method of finding the groundwater table is more scientific and more accurate. In the past, the experience of well drillers was to find the groundwater line. However, well drillers have developed many experience-based methods that have been used to this day. Well Drilling Basics A diving water level map is a contour map of groundwater.
To make a correct determination, one must first understand the basic elements of diving.
1. Diving flow direction: Diving is under the action of gravity, from the high dive level to the low for downward movement, so the flow direction of diving is perpendicular to the dive isohyetal line and from the dive level value of the large point to the dive level value of the small short line, such as the arrow pointing in Figure 2.
2. buried dive depth: buried depth = a point - dive level of the ground level, that corresponds to a point (ground height) of the value of the contour line and its diving water between the value of the difference grade. In general, the higher the topography, the deeper the burial of diving. The burial depth of the dive at point P in Figure 2 is 5 meters, and the burial depth of the dive at point Q is 10 meters.
3. the recharge relationship between diving and surface water (such as river water): compared with the graphical observation, if the contour on the water level map such as diving then the direction of the large value is convex, indicating that the river water level is lower than the diving level, diving supply river water; on the contrary, the river water level is higher than the diving level, river water supply diving. We can also determine the recharge relationship by diving near the surface water. The method uses the dive level values from 0 to 7d0 as the water level line in the direction of the dive level. If the plumb line points toward the river, it indicates that the dive supplies the river. If the vertical line deviates from the river, it means that the river water supply is diving, as shown in Figure 3, where 1 is diving supply river and 2 is river water supply diving.
4. Choice of well location: The well is a facility for a tubular vertical water harvesting project used to extract groundwater. In order to increase the amount of mining recharge and to ensure long-term balanced extraction of water sources, the water source should be selected as close as possible to the area of maximum interception of underground runoff, close to the recharge source and the land can adequately capture a variety of recharge, such as water sources as close as possible. The banks of rivers that provide groundwater, areas near subsurface runoff are drainage areas, etc.
As shown, in order to obtain sufficient groundwater resources, the best location for drilling wells in the area shown should be two. According to the characteristics of the contours and related knowledge, the contours are raised in the direction of large values, indicating that the values of the ground are small, i.e., the ground is a catchment area. Among the four locations, two locations have the largest curvature, indicating that there is a large variation and dive flow to the four locations at 34, so the two locations have the most abundant groundwater resources.
Using pqwt ground water detector can improve the chances of drilling a well
Hunan Puqi Geological Exploration Equipment Research Institute, a professional institution engaged in the research of pqwt ground water detector, and co-contracted with HUST to build the "National 13th Five-Year Water Special Research Project" Puqi new generation pqwt ground water detector has Portable, easy to operate, automatic map, high accuracy characteristics, its equipment has won a number of invention patents and software copyrights.
The principle of electric detection method used in the instrument is divided into artificial electric field method and natural electric field method. Artificial electric field also includes DC power supply, excitation, controlled source and other professional methods, these methods are mostly used in various large geological census projects, involving thousands of lines and points, but it is quite inconvenient to use, especially to carry the power supply device, which often requires a lot of manual labor. The natural electric field method has gradually matured after decades of research and application. It also requires people who are looking for water to have a lot of practical experience in the local environment, lithology, and has been well analysis in order to say white hair a hundred times.
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