Well group system for mining and supplementing underground water of sea island
By adopting a well group system of main wells and multiple auxiliary wells on the island, combined with the design of siphon and sedimentation pipe sections, the problems of saltwater intrusion and unreasonable water allocation during groundwater extraction in the island are solved, and efficient mining and balanced recovery are achieved Replenishment ensures the stability of groundwater quality.
Patent Information
- Application Number
- CN202411625513.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-14
AI Technical Summary
During the mining of groundwater on the island, the limited water collection capacity of a single well and the pumping of water are prone to cause the problem of salt water rising cone, which leads to deterioration of groundwater quality. In addition, the application of traditional well group systems in islands has the problem of unreasonable allocation of water replenishment in water, making it difficult to achieve efficient mining and Balanced replenishment.
The well group system of main wells and multiple auxiliary wells is adopted, and the main wells and auxiliary wells are connected by siphons. The screen pipe section is located between the groundwater level and the average sea level. The depth of the sediment pipe section can reach the unconformity surface of the aquifer or weak permeability layer. Ensure that the groundwater level is always not below the average sea level, avoid salt water entering the well, and achieve water level equilibrium change and water volume equilibrium distribution through siphons.
It realizes efficient mining and balanced replenishment of island groundwater, avoids salt water invasion into the well pipe, ensures stability of groundwater quality, reduces operation and maintenance costs, and is suitable for applications in special environments such as islands.
Smart Images
Figure CN119434394A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a well group system for island groundwater, and in particular to a well group system for island groundwater exploitation and replenishment. Background Art
[0002] Unlike the general water resources on the mainland, islands are small in size, have weak water collection conditions, and poor water interception and storage capabilities, making it difficult to form surface water bodies such as lakes or rivers, and surface freshwater resources are very limited. However, stable underground freshwater resources have been found on many islands (i.e., rainfall infiltration replenishes the aquifer, forming a freshwater body that is thick in the middle and thin on both sides). These underground freshwater resources are a key link in the allocation of island water resources and are regarded as strategic resources to ensure the safety of island water use and maintain the health of island ecology.
[0003] However, due to the particularity of the occurrence of freshwater underground on islands, the traditional single-well groundwater exploitation method has obvious shortcomings. On the one hand, the total thickness of freshwater underground in many islands is only a few meters or more than ten meters, the water collection capacity of a single well is limited, and the exploitation efficiency is low; on the other hand, pumping water from a single well position is prone to cause the problem of salt water cone rise, resulting in the deterioration of groundwater quality and the inability to maintain a stable exploitation volume. Although pumping water from a well group formed by the combination of multiple single wells can guarantee a certain amount of exploitation, the groundwater burial depth at different well locations is different, and the pumping rate of each well is difficult to accurately control and quantify, resulting in low operating efficiency and high energy consumption costs of the well group, which is not conducive to long-term management and operation. In addition, the replenishment of groundwater on islands based on the well group formed by the combination of multiple single wells also has the problem of unreasonable distribution of replenishment water, making it difficult to achieve balanced replenishment. These problems seriously restrict the development, utilization, management and protection of groundwater resources on islands. Although the traditional well group system has been widely used in non-island areas, its application in island aquifers faces many bottlenecks. Summary of the invention
[0004] Purpose of the invention: The purpose of the present invention is to propose a well group system for groundwater exploitation and replenishment on islands, so as to avoid the intrusion of salt water into the well pipe during groundwater exploitation on islands, and to achieve efficient groundwater exploitation and balanced replenishment on islands.
[0005] Technical solution: The present invention has a main well and multiple auxiliary wells, and the multiple auxiliary wells are spaced around the main well. Each auxiliary well is connected to the main well through a siphon. The main well and the auxiliary wells include a water-blocking pipe section, a sieve hole pipe section and a sedimentation pipe section arranged in sequence from top to bottom. The well wall of the sieve hole pipe section is provided with multiple sieve holes, and the sieve holes are located between the groundwater level and the average sea level. A pumping pipe is provided in the main well, and the top of the pumping pipe passes through the main well and is connected to a reinjection water treatment device.
[0006] The total height of the sieve hole pipe section is not less than 0.5m, the top elevation of the sieve hole pipe section is lower than the groundwater level, and the bottom elevation of the sieve hole pipe section is not lower than the average sea level, ensuring that the groundwater level around all wells is always not lower than the average sea level, that is, salt water will not enter the well.
[0007] The bottom of the water pumping pipe is inserted into the lower part of the main well, and the water pumping pipe opening is higher than the siphon pipe opening in the main well, thereby ensuring that the siphon pipe can always play a siphon role.
[0008] The top of the pumping pipe passes through the main well and is connected to a water pump, and the water pump is connected to a reinjection water treatment device through a water delivery pipeline. The collected rainwater resources are filtered for impurities by the reinjection water treatment device and enter the main well through the pumping pipe.
[0009] The distance between the main well and the auxiliary well and the distance between adjacent auxiliary wells are not less than 100m.
[0010] The diameter of the main well is 0.8 to 2 m, and the diameter of the auxiliary well is 0.4 to 1 m. When there are a large number of auxiliary wells, the diameter of the main well 110 should take a larger value.
[0011] The distances between the main well and the auxiliary well and the island coastline are no less than the maximum spacing between the main and auxiliary wells so as to cover a wider range of aquifers.
[0012] The two ends of the siphon pipe are respectively inserted into the main well and the auxiliary well, and the siphon pipe mouth is 0.5 to 1 m away from the bottom of the well to maximize the extraction of groundwater collected in the well.
[0013] The siphon pipe is located entirely below the groundwater level, ensuring that it can always play a siphoning role.
[0014] The total height of the sedimentation pipe section is not less than 5m and is located below the average sea level. The maximum depth of the sedimentation pipe section can reach the unconformity surface of the aquifer or the weak permeable layer.
[0015] Beneficial effects: The present invention has the following advantages:
[0016] (1) Based on the structural setting of the well group system, the aquifer covered by the well group can be simultaneously exploited through the main well, and the aquifer covered by the well group can be synchronously replenished through the main well. In addition, since the main well and the auxiliary well are connected through a siphon pipe, the water level of the well group can be balanced and the water volume can be evenly distributed during groundwater exploitation and replenishment. No human intervention or regulation is required, and the sustainable development and balanced utilization of groundwater resources are safely and conveniently achieved;
[0017] (2) Since the total height of the sieve hole section of the main and auxiliary wells is small and the buried depth is shallow, the short-term water collection capacity is poor. The main and auxiliary wells are both equipped with a sedimentation pipe section with a large depth to ensure that a large amount of fresh water is always maintained in the main and auxiliary wells. The main and auxiliary wells are connected by a siphon pipe that is inserted into the bottom of the sedimentation pipe section. The sedimentation pipe section and the siphon pipe are set up to ensure that the main well has a large emergency production volume, which effectively solves the adverse effects caused by the small total height and shallow buried depth of the sieve hole section;
[0018] (3) The present invention requires that the bottom elevation of the screen hole pipe section of the main and auxiliary wells is not lower than the average sea level, that is, when groundwater is exploited, the groundwater level is always not lower than the average sea level. According to the classic Ghyben-Herzberg principle, when the underground fresh water level is not lower than the average sea level, the underground salty and fresh water interface will never be higher than the average sea level, thereby ensuring that underground salt water will never enter the wellbore, fundamentally solving the problem of salt water easily invading the well pipe during groundwater exploitation on islands. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0020] Figure 2 It is a plan view of the well group system of the present invention. DETAILED DESCRIPTION
[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] like Figure 1 and Figure 2 As shown, the well group system for groundwater exploitation and replenishment on an island of the present invention comprises a main well 110 and a plurality of auxiliary wells 120. The plurality of auxiliary wells 120 are distributed around the main well 110 with the main well 110 as the center. The spacing between the main well 110 and the auxiliary wells 120 and the spacing between adjacent auxiliary wells 120 are not less than 100m, and the total number of auxiliary wells 120 is not less than 2. The diameter of the main well 110 is 0.8-2m, and the diameter of the auxiliary well 120 is 0.4-1m. When the number of auxiliary wells 120 is large, the diameter of the main well 110 should be large, and the depths of the main well 110 and the auxiliary well 120 are similar. The spacing between the main well 110 and the auxiliary well 120 is related to the land area of the island. For an island with a large land area, the spacing between the main and auxiliary wells is large to cover a larger range of aquifers. The distances between the main well 110 and the auxiliary well 120 and the coastline should not be less than the maximum spacing between the main and auxiliary wells.
[0023] Each auxiliary well 120 is connected to the main well 110 through a siphon 11. The two ends of the siphon 11 extend into the main well 110 and the auxiliary well 120 respectively. The siphon mouth is 0.5 to 1 m away from the bottom of the well to maximize the extraction of groundwater collected in the well. The elevation of the horizontal section of the siphon 11 is close to the mean sea level 23, so that the siphon 11 is located below the groundwater level as a whole, ensuring that it can always play a siphon role.
[0024] The main well 110 and the auxiliary well 120 both include a well cover 111 and a well wall. The well wall includes a watertight pipe section 113, a sieve pipe section 114 and a sedimentation pipe section 115 arranged in sequence from top to bottom. The well wall of the sieve pipe section 114 is provided with a plurality of sieve holes, and the sieve holes are located between the groundwater level and the mean sea level 23. The total height of the sieve pipe section 114 is not less than 0.5 m, and the top elevation of the sieve pipe section 114 is slightly lower than the groundwater level, and the bottom elevation of the sieve pipe section 114 is not lower than the mean sea level 23, thereby ensuring that the groundwater level around all wells is always not lower than the mean sea level 23. When the underground fresh water level is not lower than the mean sea level, the underground fresh and salt water interface will never be higher than the mean sea level, thereby ensuring that underground salt water will never enter the wellbore, fundamentally solving the problem of salt water easily invading the well pipe during groundwater exploitation on islands. The total height of the sedimentation pipe section 115 is not less than 5 m and is located 23 below the mean sea level. The maximum depth of the sedimentation pipe section 115 can reach the unconformity surface of the aquifer or the weak permeable layer.
[0025] A pumping pipe 112 is provided in the main well 110. The top of the pumping pipe 112 passes through the manhole cover 111 of the main well 110 and is connected to the water pump 12. The water pump 12 is connected to the recharge water treatment device 14 through the water delivery pipeline 13. The bottom of the pumping pipe 112 penetrates into the lower part of the main well 110, and the pumping pipe mouth is higher than the siphon pipe mouth in the main well 110, ensuring that the siphon pipe 11 can always play a siphoning role. The groundwater collected in the main well 110 is extracted by the water pump 12. When the water level of the main well 110 drops, the groundwater collected in the auxiliary well 120 is siphoned through the siphon pipe 11 to maintain the sustainable exploitation of the main well 110.
[0026] The island mainly collects rainwater resources, so the recharging water treatment device 14 preferably adopts one of the two methods, sedimentation filtration and adsorption filtration, without too many complicated water treatment processes, so that the system operation and maintenance management cost is at a low level. The collected rainwater resources are filtered for impurities through the recharging water treatment device 14, enter the main well 110 through the pumping pipe 112, and replenish groundwater through the sieve holes of the main well. When the water level of the main well rises, it is replenished to the auxiliary well 120 through the siphon 11, and the groundwater is replenished through the sieve holes of the auxiliary well.
[0027] Based on the well group system and the well wall opening position design, the problem of salt water easily invading the well pipe during the exploitation of groundwater on the island is solved. Combined with the siphon design, the efficient and safe exploitation and balanced replenishment of groundwater on the island can be achieved, and the effect is remarkable. The aquifer covered by the well group can be exploited synchronously only through the main well 110, while ensuring the large exploitable amount of the main well 110, and salt water will not enter any well. The aquifer covered by the well group can also be replenished synchronously only through the main well 110. In addition, since the main well 110 and the auxiliary well 120 are connected through the siphon 11, the well group water level can be balanced and the water volume can be balanced during the exploitation and replenishment of groundwater. No human intervention or regulation is required, and the sustainable development and balanced utilization of groundwater resources are realized safely and conveniently. It has higher exploitation efficiency, stronger water quality assurance capability and more balanced groundwater replenishment strategy, and the system structure is easy to implement and easy to operate and maintain, which is suitable for wide promotion and application in islands and similar environments.
[0028] The working process of the present invention is:
[0029] When the main well 110 in the well group system extracts groundwater collected by the main well through the water pump 12, the water level of the main well 110 drops, and then the groundwater collected in the auxiliary well 120 is extracted through the siphon 11. During the exploitation process, only the main well 110 is needed to synchronously and evenly exploit the aquifer covered by the well group, without human intervention in the water distribution between the main and auxiliary wells, and the main well 110 can exploit N times the amount of traditional single well exploitation (N is the total number of main and auxiliary wells). Although only the main well 110 is exploited, the drop in groundwater level 22 when the well group exploits groundwater is not borne by the main well alone, but by the well group together. The corresponding underground fresh-salt water interface 24 when the well group exploits groundwater will not rise significantly, effectively avoiding the problem of large-scale salt water cone rise caused by concentrated exploitation of groundwater in a single well.
[0030] When the main well 110 in the well group system replenishes groundwater through the recharging water treatment device 14, the water level of the main well 110 rises, and then the auxiliary well 120 siphons the replenishment water from the main well 110 through the siphon tube 11. During the replenishment process, the aquifer covered by the well group can be replenished synchronously and evenly only through the main well 110, without human intervention in the water distribution between the main and auxiliary wells, and the replenishment efficiency of the main well 110 is N times the replenishment efficiency of the traditional single well (N is the comprehensive number of main and auxiliary wells). Although the replenishment water is only supplied to the main well 110, the groundwater level 21 when the well group replenishes groundwater is not limited to the main well 110, but is shared by the well group. The corresponding underground salt-fresh water interface 25 when the well group replenishes groundwater shows a significant drop, which effectively avoids the problem of unbalanced concentrated replenishment of groundwater in a single well.
[0031] The well group system proposed in the present invention has stronger water quality safety assurance capabilities, higher mining efficiency and a more balanced groundwater recharge strategy. The system has a simple structure and is easy to implement and operate and manage. It is particularly suitable for widespread promotion and application in island underground salt and fresh water coexistence and similar environments.
Claims
1. A well group system for groundwater exploitation and replenishment on islands, characterized in that: It includes a main well and multiple auxiliary wells, which are distributed around the main well at intervals. Each auxiliary well is connected to the main well through a siphon. The main well and the auxiliary wells include a water-blocking pipe section, a sieve pipe section and a sedimentation pipe section arranged from top to bottom. The well wall of the sieve pipe section is provided with multiple sieve holes, and the sieve holes are located between the groundwater level and the average sea level. A pumping pipe is arranged in the main well, and the top of the pumping pipe passes through the main well and is connected to a reinjection water treatment device.
2. A well group system for island groundwater exploitation and replenishment according to claim 1, characterized in that: The total height of the sieve hole pipe section is not less than 0.5m, the top elevation of the sieve hole pipe section is lower than the groundwater level, and the bottom elevation of the sieve hole pipe section is not lower than the average sea level.
3. A well group system for island groundwater exploitation and replenishment according to claim 1, characterized in that: The bottom of the water pumping pipe is inserted into the lower part of the main well, and the water pumping pipe opening is higher than the siphon pipe opening in the main well.
4. A well group system for island groundwater exploitation and replenishment according to claim 3, characterized in that: The top of the water pump passes through the main well and is connected to a water pump, and the water pump is connected to a recharging water treatment device through a water delivery pipeline.
5. A well group system for island groundwater exploitation and replenishment according to claim 1, characterized in that: The distance between the main well and the auxiliary well and the distance between adjacent auxiliary wells are not less than 100m.
6. A well group system for island groundwater exploitation and replenishment according to claim 5, characterized in that: The diameter of the main well is 0.8-2m, and the diameter of the auxiliary well is 0.4-1m.
7. A well group system for island groundwater exploitation and replenishment according to claim 5, characterized in that: The distance between the main well and the auxiliary well and the island coastline shall not be less than the maximum distance between the main well and the auxiliary well.
8. A well group system for island groundwater exploitation and replenishment according to claim 1, characterized in that: The two ends of the siphon pipe are respectively inserted into the main well and the auxiliary well, and the siphon pipe mouth is 0.5 to 1 m away from the well bottom.
9. A well group system for island groundwater exploitation and replenishment according to claim 8, characterized in that: The siphon is entirely located below the groundwater level.
10. A well group system for island groundwater exploitation and replenishment according to claim 1, characterized in that: The total height of the sedimentation pipe section is not less than 5m and is located below the average sea level.