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Fluid Pressure over Curved Plate of Constant Width

Fluid Pressure over Curved Plate of Constant Width

When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...

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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...

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Updated: Jul 10, 2026

Evolution of Staircase Structures in Diffusive Convection

Evolution of Staircase Structures in Diffusive Convection

Published on: September 5, 2018

A simple method for locating the fresh water-salt water interface using pressure data.

Kue-Young Kim¹, Chul-Min Chon, Ki-Hwa Park

¹Groundwater and Geothermal Division, Korea Institute of Geosciences and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, Republic of Korea. kykim@kigam.re.kr

|November 2, 2007

Summary

A new method estimates the fresh water-salt water interface depth in coastal aquifers using pressure data. This approach aids in managing groundwater resources by monitoring saltwater intrusion, crucial for coastal environments.

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Last Updated: Jul 10, 2026

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Area of Science:

Hydrogeology
Coastal groundwater management
Geophysics

Background:

Saltwater intrusion poses a significant threat to coastal groundwater resources, impacting exploitation, restoration, and management efforts.
Continuous monitoring of the fresh water-salt water interface is essential for sustainable groundwater resource management in coastal areas.

Purpose of the Study:

To present a straightforward method for estimating the depth of the fresh water-salt water interface in coastal aquifers.
To validate the proposed method using field data from a coastal aquifer.

Main Methods:

Utilizing two pressure datasets from fresh and saline zones within a single borehole.
Applying the density difference between fresh and saline water to estimate interface depth.
Validating the method in coastal aquifers with a sharp interface and thin transition zone.

Main Results:

The proposed method successfully estimated interface depth variations in a Korean coastal aquifer.
Interface depth fluctuations correlated with daily tidal cycles and seasonal rainfall.
Estimated interface depths showed strong agreement with measured electrical conductivity profiles.

Conclusions:

The developed pressure-based method offers a practical approach for monitoring the fresh water-salt water interface in coastal aquifers.
This technique supports effective groundwater management by providing timely data on saltwater intrusion dynamics.
The study highlights the influence of tidal and rainfall events on interface position, crucial for predictive modeling.