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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

Linear relationships of Darcy fluxes vs. hydraulic gradients measured from the field permeameter test.(a, b, c) Results of the test a, b, and c as shown in Figure 3. (d) Linear regression for the total measurements from the three tests.
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f5: Linear relationships of Darcy fluxes vs. hydraulic gradients measured from the field permeameter test.(a, b, c) Results of the test a, b, and c as shown in Figure 3. (d) Linear regression for the total measurements from the three tests.

Mentions: From the field tests, a total of 12 measurements of the Darcy flux and hydraulic gradient were acquired using the proposed permeameter. Figure 4 shows the water level changes in the cylinder during the multiple tests. The linear increase of water level in the cylinder indicated that the water flow from the chamber was steady. The point K values ranged from 0.024 to 0.037 cm/s with the average and standard deviation of 0.031 ± 0.004 cm/s. The linear K values determined from the each test were 0.028, 0.032, and 0.036 cm/s, while the linear K value from the linear regression for the total measurements was 0.03 cm/s with R value of 0.95 (Fig. 5).


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

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

Linear relationships of Darcy fluxes vs. hydraulic gradients measured from the field permeameter test.(a, b, c) Results of the test a, b, and c as shown in Figure 3. (d) Linear regression for the total measurements from the three tests.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Linear relationships of Darcy fluxes vs. hydraulic gradients measured from the field permeameter test.(a, b, c) Results of the test a, b, and c as shown in Figure 3. (d) Linear regression for the total measurements from the three tests.
Mentions: From the field tests, a total of 12 measurements of the Darcy flux and hydraulic gradient were acquired using the proposed permeameter. Figure 4 shows the water level changes in the cylinder during the multiple tests. The linear increase of water level in the cylinder indicated that the water flow from the chamber was steady. The point K values ranged from 0.024 to 0.037 cm/s with the average and standard deviation of 0.031 ± 0.004 cm/s. The linear K values determined from the each test were 0.028, 0.032, and 0.036 cm/s, while the linear K value from the linear regression for the total measurements was 0.03 cm/s with R value of 0.95 (Fig. 5).

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