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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 diagram of the proposed field permeameter.(a) A vertical cylindrical pipe and (b) a rigid open-ended chamber. They are interconnected with a flexible tube.
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f1: Schematic diagram of the proposed field permeameter.(a) A vertical cylindrical pipe and (b) a rigid open-ended chamber. They are interconnected with a flexible tube.

Mentions: In order to determine VHC using Darcy's law, measurements of volumetric flow rate (discharge, Q [L3/T]) and hydraulic gradient (dh/dL [L/L]) should be available. The proposed permeameter is designed to measure these two parameters simultaneously on site. The permeameter consists of two main components: a rigid open-bottom chamber and a cylinder (Fig. 1). These two components of the permeameter are interconnected with a flexible tube. The cylinder is a top-open hollow pipe with cone-shaped edge at its bottom. It is used to measure the volumetric flow rate from the chamber to the cylinder, and to induce upward water flow through sediments in the chamber. The chamber has open bottom and closed top to isolate potential upward flow from the sediment toward the open water body across the water-sediment interface. Manometers connected to the chamber are used to measure the difference in hydraulic head between vertically separated two points in the chamber.


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

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

Schematic diagram of the proposed field permeameter.(a) A vertical cylindrical pipe and (b) a rigid open-ended chamber. They are interconnected with a flexible tube.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Schematic diagram of the proposed field permeameter.(a) A vertical cylindrical pipe and (b) a rigid open-ended chamber. They are interconnected with a flexible tube.
Mentions: In order to determine VHC using Darcy's law, measurements of volumetric flow rate (discharge, Q [L3/T]) and hydraulic gradient (dh/dL [L/L]) should be available. The proposed permeameter is designed to measure these two parameters simultaneously on site. The permeameter consists of two main components: a rigid open-bottom chamber and a cylinder (Fig. 1). These two components of the permeameter are interconnected with a flexible tube. The cylinder is a top-open hollow pipe with cone-shaped edge at its bottom. It is used to measure the volumetric flow rate from the chamber to the cylinder, and to induce upward water flow through sediments in the chamber. The chamber has open bottom and closed top to isolate potential upward flow from the sediment toward the open water body across the water-sediment interface. Manometers connected to the chamber are used to measure the difference in hydraulic head between vertically separated two points in the chamber.

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