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Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities

A water layer and seawater technology, applied in water supply devices, water supply devices, measuring devices, etc., can solve problems such as water level drop, impact on urban drinking water supply capacity, seawater intrusion, etc.

Inactive Publication Date: 2003-05-07
SCHLUMBERGER TECH LTD BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 As shown, this overexploitation has led to a drop in the water table in the aquifer, allowing seawater to intrude into the aquifer
Seawater intrusion into wells supplying drinking water, causing serious long-term impacts on the city's drinking water supply capacity

Method used

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  • Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities
  • Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities
  • Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities

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Embodiment approach

[0047] exist Figure 5 Among them, according to another embodiment of the present invention, the resistivity array 28 can be lowered into a dedicated observation / monitoring well 26 . Figure 5 The shown interface between seawater and potable water also exists inside this "observation / monitoring well" 26 . Similarly, the presence and location of seawater can be deduced from voltage-current measurements using a resistivity array 28 installed on the inside of the observation well. If the graph has a long-spaced range, then the resistivity array 28 can also be used to monitor the presence (or absence) of seawater at each depth along the array 28 and indicate the hydraulic head (i.e., free water level) in the well. ) and the variation of the head with time.

[0048] Aquifer Electronic Monitoring Electrode Cable System

[0049] refer to figure 2 with Image 6 , recalling that coastal cities rely on groundwater from underground aquifers to meet all or part of the city's water nee...

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Abstract

Sensors are permanently placed in the ground near observation and injection wells in order to passively and continuously monitor the status of seawater advance toward fresh water aquifers near coastal cities as well as the status of fresh water injected into the injection wells. Such sensor devices are installed in the ground and electrically connected to surface acquisition equipment that would, without human intervention, transmit acquired data to a centralized facility for processing and interpretation. Various types of sensors can be used: the sensors used for general reservoir monitoring and / or the sensors used for leak detection, soil heating, and temperature mapping. Alternatively, a special type of sensor can be designed and provided for the purpose of monitoring the status of seawater advance toward fresh water aquifers.

Description

technical field [0001] The subject of the present invention relates to methods and devices for passively and continuously monitoring the movement of seawater into freshwater aquifers near coastal cities, by placing sensors in the soil near observation and injection wells, for example by placing certain types of The electrode cable system of the company transmits the obtained data back to the central processing equipment and responds accordingly, thereby reducing the ingress of seawater into drinking water aquifers near coastal cities. Background technique [0002] Coastal cities rely on groundwater beneath the surface to meet all or part of the city's water needs. Groundwater has historically been overexploited such that the rate of pumping from subsurface aquifers exceeds the aquifer's natural recharge rate. Such as figure 1 As shown, this overexploitation has led to a drop in the water table in the aquifer, allowing seawater to intrude into the aquifer. Seawater intrusi...

Claims

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Application Information

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IPC IPC(8): E03B1/00E21B47/10G01V9/02
CPCG01V9/02E21B47/102E03B1/00E21B47/113
Inventor 戴维·J·罗西威廉·A·温伯格彼得·V·霍华德让-皮埃尔·R·德尔霍姆卡马尔·巴伯尔
Owner SCHLUMBERGER TECH LTD BV
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