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Method for determining position of salt-fresh water interface in coastal zone with fresh water zone satisfying Dupuit assumption

A technology of brackish water interface and fresh water zone, applied in the field of groundwater dynamics in coastal zones, can solve the problems of Hubbert's formula limitation and inability to know in advance

Inactive Publication Date: 2016-05-25
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

However, the difficulty of using the Hubbert formula is that the position of the interface itself cannot be known in advance, so the two water heads at any point on the interface cannot be known in advance, which limits the practical application of the Hubbert formula

Method used

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  • Method for determining position of salt-fresh water interface in coastal zone with fresh water zone satisfying Dupuit assumption
  • Method for determining position of salt-fresh water interface in coastal zone with fresh water zone satisfying Dupuit assumption
  • Method for determining position of salt-fresh water interface in coastal zone with fresh water zone satisfying Dupuit assumption

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Embodiment Construction

[0041] By examining the description of the water head at any point above and below the brackish-fresh water interface, the calculation formula for determining the position of the brackish-fresh water interface can be derived based on the brackish water piezometric head at any point in the brackish water zone and the freshwater piezometric head at any point in the freshwater zone (zhou, 2011). exist image 3 It is also assumed that ① the coastal phreatic aquifer is homogeneous and isotropic, ② the groundwater flow is a steady flow and discharges into the sea, and ③ the groundwater flow in the freshwater zone satisfies the Jobuy assumption. The formula for describing the freshwater piezometric head at any point C in the freshwater zone on the same vertical line as the coastal zone is:

[0042] h f = P f ρ f g ...

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Abstract

The invention discloses a method for determining a position of a salt-fresh water interface in a coastal zone with a fresh water zone satisfying the Dupuit assumption. By investigating a pressure balance relationship of an arbitrary point in a salt water zone under the salt-fresh water interface in a coastal homogeneous isotropic unconfined aquifer satisfying the Dupuit assumption, a fresh water column from a water table to the interface plus a salt water column from the interface to the point in a unit horizontal area should keep balance with a salt water column existing at the point, thus, a mathematical formula for calculating the position of the salt-fresh water interface based on a salt water piezometric head at an arbitrary point A in the salt water zone below the interface and a fresh-water water table at a point E on a same vertical line above the interface can be deduced. Through examination of the description of water heads at arbitrary points below and above the salt-fresh water interface, a general formula for determining position of the salt-fresh water interface based on the salt water piezometric head at the arbitrary point A in the salt water zone and a fresh water piezometric head at an arbitrary point C in the fresh water zone can be deduced. The two methods each require 2 adjacent piezometric holes which respectively tap the fresh water zone and the salt water zone.

Description

1. Technical field [0001] The invention relates to a method for determining the salty-fresh water interface by using the observation data of the water head in the coastal zone, which can be used to study the hydrodynamic characteristics of the groundwater in the coastal zone and analyze the evolution and protection of the groundwater environment in the coastal zone, and belongs to the technical field of groundwater dynamics in the coastal zone. 2. Background technology [0002] There are long coastlines on land, and coastal areas are usually areas with rapid economic development and dense population. There are underground aquifers distributed in many coastal areas, and the groundwater is discharged into the sea under natural conditions. The underground freshwater resources in coastal aquifers are important water supply sources in coastal areas and become the main target of local development and utilization. Exploitation of underground freshwater resources in coastal aquifer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
Inventor 周训
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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