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Hydraulic experiments for determination of in-situ hydraulic conductivity of submerged sediments.

Lee BJ, Lee JH, Yoon H, Lee E - Sci Rep (2015)

Bottom Line: The system allows water to move upward through the porous media filled in the permeameter chamber driven into sediments at water-sediment interface.Darcy flux and hydraulic gradient can be measured using the system, and the VHC can be determined from the relationship between them using Darcy's law.Results from the evaluation tests indicate that the permeameter proposed in this study can be used to measure VHC of saturated sandy sediments at water-sediment interface in stream and marine environment with high accuracy.

View Article: PubMed Central - PubMed

Affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea.

ABSTRACT
A new type of in-situ hydraulic permeameter was developed to determine vertical hydraulic conductivity (VHC) of saturated sediments from hydraulic experiments using Darcy's law. The system allows water to move upward through the porous media filled in the permeameter chamber driven into sediments at water-sediment interface. Darcy flux and hydraulic gradient can be measured using the system, and the VHC can be determined from the relationship between them using Darcy's law. Evaluations in laboratory and in field conditions were performed to see if the proposed permeameter give reliable and valid measures of the VHC even where the vertical flow at water-sediment interface and fluctuation of water stage exist without reducing the accuracy of the derived VHC. Results from the evaluation tests indicate that the permeameter proposed in this study can be used to measure VHC of saturated sandy sediments at water-sediment interface in stream and marine environment with high accuracy.

No MeSH data available.


Related in: MedlinePlus

Schematic representation of the upward water flow from the chamber to the cylinder.(a) Water level in the tubing, representing the hydraulic head in upper end of the chamber. (b) Upward water flow induced by adjusting relative elevation of the cylinder inlet to that of the water level in the tubing.
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f2: Schematic representation of the upward water flow from the chamber to the cylinder.(a) Water level in the tubing, representing the hydraulic head in upper end of the chamber. (b) Upward water flow induced by adjusting relative elevation of the cylinder inlet to that of the water level in the tubing.

Mentions: The key feature of the proposed permeameter is the method to drive the upward water flow from the chamber. Figure 2 schematizes the inducement of upward flow of water in the chamber. As shown in Figure 2a, water level in the tubing connected to the chamber presents the hydraulic head in upper end of the chamber that was vertically installed in the sediment. It is summed up by elevation head and pressure head, and mathematically expressed like below:where h = hydraulic head [L], z = elevation head [L], ψ = pressure head [L], ρ = the density of fluid, and g = the acceleration of gravity.


Hydraulic experiments for determination of in-situ hydraulic conductivity of submerged sediments.

Lee BJ, Lee JH, Yoon H, Lee E - Sci Rep (2015)

Schematic representation of the upward water flow from the chamber to the cylinder.(a) Water level in the tubing, representing the hydraulic head in upper end of the chamber. (b) Upward water flow induced by adjusting relative elevation of the cylinder inlet to that of the water level in the tubing.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4300508&req=5

f2: Schematic representation of the upward water flow from the chamber to the cylinder.(a) Water level in the tubing, representing the hydraulic head in upper end of the chamber. (b) Upward water flow induced by adjusting relative elevation of the cylinder inlet to that of the water level in the tubing.
Mentions: The key feature of the proposed permeameter is the method to drive the upward water flow from the chamber. Figure 2 schematizes the inducement of upward flow of water in the chamber. As shown in Figure 2a, water level in the tubing connected to the chamber presents the hydraulic head in upper end of the chamber that was vertically installed in the sediment. It is summed up by elevation head and pressure head, and mathematically expressed like below:where h = hydraulic head [L], z = elevation head [L], ψ = pressure head [L], ρ = the density of fluid, and g = the acceleration of gravity.

Bottom Line: The system allows water to move upward through the porous media filled in the permeameter chamber driven into sediments at water-sediment interface.Darcy flux and hydraulic gradient can be measured using the system, and the VHC can be determined from the relationship between them using Darcy's law.Results from the evaluation tests indicate that the permeameter proposed in this study can be used to measure VHC of saturated sandy sediments at water-sediment interface in stream and marine environment with high accuracy.

View Article: PubMed Central - PubMed

Affiliation: Groundwater Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea.

ABSTRACT
A new type of in-situ hydraulic permeameter was developed to determine vertical hydraulic conductivity (VHC) of saturated sediments from hydraulic experiments using Darcy's law. The system allows water to move upward through the porous media filled in the permeameter chamber driven into sediments at water-sediment interface. Darcy flux and hydraulic gradient can be measured using the system, and the VHC can be determined from the relationship between them using Darcy's law. Evaluations in laboratory and in field conditions were performed to see if the proposed permeameter give reliable and valid measures of the VHC even where the vertical flow at water-sediment interface and fluctuation of water stage exist without reducing the accuracy of the derived VHC. Results from the evaluation tests indicate that the permeameter proposed in this study can be used to measure VHC of saturated sandy sediments at water-sediment interface in stream and marine environment with high accuracy.

No MeSH data available.


Related in: MedlinePlus