CN-122013852-A - Environment-friendly recharging and source supplementing technical method for groundwater in northern karst water system supplementing area

CN122013852ACN 122013852 ACN122013852 ACN 122013852ACN-122013852-A

Abstract

The application provides an environment-friendly recharging and source supplementing technical method for groundwater in a northern karst water system supplementing area, and relates to the technical field of hydrogeology. The method combines urban construction engineering and recharging engineering in northern karst areas, realizes rainwater collection, treatment and recharging, can avoid downstream water quality deterioration caused by groundwater recharging, ensures the recharging and source supplementing process to be safe and environment-friendly, and realizes the organic combination of 'source supplementing' and 'water protecting'. The method breaks through the limitation of the traditional sponge urban rainwater infiltration engineering, can collect urban rainwater efficiently, can realize accurate and efficient recharging of specific karst aquifers according to the geological features and the distribution features of karst aquifers in northern karst areas, supplements karst groundwater reserves from the source, effectively maintains stable runoff of karst spring water, fundamentally reduces risks of spring water failure and cutoff, and realizes the core target of groundwater recharging.

Inventors

XING XUERUI
WANG YUZHENG
ZHANG FENGJUAN
Lei Yaodong
WANG GUANGKAI
WANG LIYAN
Dou Shuchang
XING LITING
HUANG LINXIAN

Assignees

山东正元环境科技有限公司
济南大学

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (10)

1. The technical method for the environmental protection recharging and source supplementing of the groundwater in the northern karst water system supplementing area is characterized by comprising the following steps of, S1, finding out the groundwater flow direction of an area where a surface water collecting area is located, and calculating a hydraulic gradient; s2, arranging an observation well at the downstream of the surface water collecting area according to the ascertained groundwater flow direction; s3, constructing an observation well, and calculating the permeability coefficient k of the area where the surface water collecting area is located; S4, determining the position of the recharging well according to the position of the observation well and the permeability coefficient of the area where the surface water collecting area is located; s5, recharging well construction, determining types and characteristics of recharging aquifers, and calculating single well recharging quantity according to the recharging aquifer types; s6, setting a water purifying pond and a water reservoir according to site conditions of the surface water collecting area; s7, recharging the recharging well, and determining the standard single-well recharging amount of the recharging well; s8, recharging and monitoring.
2. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system supply area according to claim 1, wherein the step S3 comprises the following steps, 3.1 Drilling and perforating, and calculating the karst fracture rate of the core in sections; 3.2, pumping water and flushing the well until water and sand are cleaned; 3.3, calculating the permeability coefficient k of the area where the surface water collecting area is located through a pumping test.
3. The method for environmental protection recharging and source supplementing of the groundwater in the northern karst water system supplementing area according to claim 2, wherein the pumping test adopts steady flow pumping, and the water level stabilizing time is not less than 8 hours.
4. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system supplementing area according to claim 2, wherein when calculating the permeability coefficient k, 3.3.1 The karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a karst water diving area, no observation motor-pumped well is arranged around the observation well, and the calculation formula of the permeability coefficient k is as follows ; 3.3.2 The karst stratum thickness of the area of the surface water collecting area is smaller, the area of the surface water collecting area is a karst water diving area, the periphery of the observation well is provided with an observation motor-pumped well, and the calculation formula of the permeability coefficient k is that ; 3.3.3 The karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a covered karst water bearing area, no observation motor-pumped well is arranged around the observation well, and the calculation formula of the permeability coefficient k is as follows ; 3.3.4 Karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a covered karst water bearing area, observation motor-pumped wells are arranged around the observation well, and a calculation formula of the permeability coefficient k is as follows ; 3.3.5 The karst stratum thickness of the area where the surface water collecting area is located is larger, and the karst formation crack karst development is relatively uniform, the observation well adopts an incomplete well, and the calculation formula of the permeability coefficient k is ; 3.3.6 Karst stratum thickness of the area where the surface water collecting area is located is larger, and a fracture karst development section is arranged in the middle of the karst stratum, then an incomplete well is adopted as an observation well, and a calculation formula of the permeability coefficient k is as follows ; And the karst stratum of the region where the 3.3.7 surface water collection region is located has larger thickness, the water level burial depth is deeper, and the karst formation crack karst development is relatively uniform, so that the observation well adopts an incomplete well, and the permeability coefficient k of the karst section above the water level is calculated through a water injection test.
5. The method of claim 4, wherein the motor-pumped well is used as an observation motor-pumped well if one observable motor-pumped well is arranged around the observation well, and the motor-pumped well closest to the observation well is selected as the observation motor-pumped well if a plurality of observable motor-pumped wells are arranged around the observation well.
6. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system according to claim 1, wherein the recharging well is located at the upstream of the observation well, the distance between the recharging well and the observation well is greater than or equal to 6m, and if a water source protection target exists at the downstream of the recharging well, the recharging well is located outside the boundary range of the recharging well.
7. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system supply area according to claim 1, wherein in step S5, For a submerged aquifer recharging well, the calculation formula of the recharging quantity of a single well is as follows ; For the confined water aquifer recharging well, the calculation formula of the recharging quantity of a single well is as follows 。
8. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system supply area according to claim 7, wherein the step S7 comprises the following steps, 7.1 Calculating the check recharging quantity of the single well, wherein the calculation formula of the check recharging quantity of the single well is as follows ; 7.2 Checking the recharging amount of the single well And single well recharging quantity Comparing; If it is Then by The standard single well recharging amount of the recharging well is obtained; If it is Then by And The smaller value of (2) is the standard recharge amount of the recharge well.
9. The method for environmental protection recharging and source supplementing of groundwater in a northern karst water system according to claim 1, wherein the purifying tank is internally provided with a horizontal reverse filtering layer, and the horizontal reverse filtering layer sequentially comprises a homogeneous middle sand layer, a homogeneous coarse sand layer and a homogeneous round gravel layer along the water flow direction.
10. The technical method for environmental protection recharging and source supplementing of groundwater in a northern karst water system supplementing area according to claim 1, wherein the recharging well is positioned in the reservoir, a steel pipe filter is fixedly arranged at an inlet of the recharging well, and the porosity of the steel pipe filter is 30-35%.

Description

Environment-friendly recharging and source supplementing technical method for groundwater in northern karst water system supplementing area Technical Field The invention relates to the technical field of hydrogeology, in particular to an environment-friendly recharging and source supplementing technical method for groundwater in a northern karst water system supplementing area. Background The water resource is basic natural resource and strategic economic resource for the national and civil life of the affairs. Therefore, the urban rainwater collection is important at home and abroad, so that the urban rainwater collection can not only reduce urban rainfall flood disasters and reduce the drainage pressure of municipal pipe networks, but also reduce the non-point source pollution of rainwater, improve urban water environment and realize the recycling of rainfall. However, at present, the rainwater collecting and infiltration engineering adopts a sponge urban technology, and the rainwater reaching the standard is infiltrated into the ground through a special infiltration promoting module to reduce runoff, so that the purpose of preventing waterlogging for urban flood control is achieved, that is, the current rainwater collecting and infiltration engineering does not consider the purpose aquifer of recharging, and the purpose of recharging and supplementing sources cannot be achieved. Disclosure of Invention Aiming at the problem of poor recharging and source supplementing effect of the current rainwater collecting and infiltration engineering, the technical method for recharging and source supplementing the groundwater in the northern karst water system supplementing area can effectively collect rainwater and achieve the purpose of recharging and source supplementing. The technical scheme adopted for solving the technical problems is as follows: The technical method for the environmental protection recharging and source supplementing of the groundwater in the northern karst water system supplementing area comprises the following steps, S1, finding out the groundwater flow direction of an area where a surface water collecting area is located, and calculating a hydraulic gradient; s2, arranging an observation well at the downstream of the surface water collecting area according to the ascertained groundwater flow direction; s3, constructing an observation well, and calculating the permeability coefficient k of the area where the surface water collecting area is located; S4, determining the position of the recharging well according to the position of the observation well and the permeability coefficient of the area where the surface water collecting area is located; s5, recharging well construction, determining types and characteristics of recharging aquifers, and calculating single well recharging quantity according to the recharging aquifer types; s6, setting a water purifying pond and a water reservoir according to site conditions of the surface water collecting area; s7, recharging the recharging well, and determining the standard single-well recharging amount of the recharging well; s8, recharging and monitoring. Further, step S3 includes the steps of, 3.1 Drilling and perforating, and calculating the karst fracture rate of the core in sections; 3.2, pumping water and flushing the well until water and sand are cleaned; 3.3, calculating the permeability coefficient k of the area where the surface water collecting area is located through a pumping test. Further, the water pumping test adopts stable flow water pumping, and the water level stabilizing time is not less than 8 hours. Further, in calculating the permeability coefficient k, 3.3.1 The karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a karst water diving area, no observation motor-pumped well is arranged around the observation well, and the calculation formula of the permeability coefficient k is as follows; 3.3.2 The karst stratum thickness of the area of the surface water collecting area is smaller, the area of the surface water collecting area is a karst water diving area, the periphery of the observation well is provided with an observation motor-pumped well, and the calculation formula of the permeability coefficient k is that; 3.3.3 The karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a covered karst water bearing area, no observation motor-pumped well is arranged around the observation well, and the calculation formula of the permeability coefficient k is as follows; 3.3.4 Karst stratum thickness of the area where the surface water collecting area is located is smaller, the area where the surface water collecting area is located is a covered karst water bearing area, observation motor-pumped wells are arranged around the