Identification of a hydrodynamic threshold in karst rocks from the Biscayne Aquifer, south Florida, USA
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Material Information

Title:
Identification of a hydrodynamic threshold in karst rocks from the Biscayne Aquifer, south Florida, USA
Series Title:
Hydrogeology Journal
Creator:
DiFrenna, Vincent J.
Price, René M.
Savabi, M. Reza
Publisher:
Springer
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Karst -- Florida -- Biscayne Aquifer
Hydraulics -- Florida -- Biscayne Aquifer
Porosity -- Florida -- Biscayne Aquifer
Reynolds number -- Florida -- Biscayne Aquifer
Genre:
article
serial ( sobekcm )
Spatial Coverage:
Biscayne Aquifer (Fla.)
Coordinates:
25.589811 x -80.236367

Notes

Abstract:
A hydrodynamic threshold between Darcian and non-Darcian flow conditions was found to occur in cubes of Key Largo Limestone from Florida, USA (one cube measuring 0.2 m on each side, the other 0.3 m) at an effective porosity of 33% and a hydraulic conductivity of 10 m/day. Below these values, flow was laminar and could be described as Darcian. Above these values, hydraulic conductivity increased greatly and flow was non-laminar. Reynolds numbers (Re) for these experiments ranged from <0.1 to 7. Non-laminar flow conditions observed in the hydraulic conductivity tests were observed at Re close to 1. Hydraulic conductivity was measured on all three axes in a permeameter designed specifically for samples of these sizes. Positive identification of vertical and horizontal axes as well as 100 percent recovery for each sample was achieved. Total porosity was determined by a drying and eighing method, while effective porosity was determined by a submersion method. Bulk density, total porosity and effective porosity of the Key Largo Limestone cubes averaged 1.5 g/cm3, 40% and 30%, respectively. Two regions of anisotropy were observed, one close to the round surface, where vertical flow dominated, and the other associated with a dense-laminar layer, below which horizontal flow dominated.
Citation/Reference:
DiFrenna, V.J., R.M. Price, M.R. Savabi. 2008. Identification of a hydrodynamic threshold in karst rocks from the Biscayne Aquifer, South Florida, USA. Hydrogeology Journal 16(1): 31-42.

Record Information

Source Institution:
Florida International University
Rights Management:
Please contact the owning institution for licensing and permissions. It is the users responsibility to ensure use does not violate any third party rights.
Resource Identifier:
FI14082550