Transmissivity Estimates from Well Hydrographs in Karst and Fractured Aquifer

Link to Full Text

Download Full Text

Publication Date

5-1-2000

Publication Title

Groundwater

Volume Number

38

Issue Number

3

Abstract

Hydrograph recessions from rainfall events have been previously analyzed for discharge at springs and streams; however, relatively little quantitative research has been conducted with regard to hydrograph analysis of recessions from monitoring wells screened in karst aquifers. In previous work, a quantitative hydrograph analysis technique has been proposed from which matrix transmissivity (i.e., transmissivity of intergranular porosity) and specific yields of matrix, fracture, and conduit components of the aquifer may be determined from well hydrographs. The technique has yielded realistic results at three sites tested by the authors (Y‐12, Oak Ridge, Tennessee; Crane, Indiana; and Fort Campbell, Kentucky). Observed field data, as well as theoretical considerations, show that karst well hydrographs are valid indicators of hydraulic properties of the associated karst aquifers. Results show matrix transmissivity (T) values to be in good agreement with values calculated using more traditional parameter estimation techniques, such as aquifer pumping tests and slug tests in matrix dominated wells. While the hydrograph analysis technique shows promise for obtaining reliable estimates of karst aquifer T with a simple, relatively inexpensive and passive method, the utility of the technique is limited in its application depending on site‐specific hydrologic conditions, which include shallow, submerged conduit systems located in areas with sufficient rainfall for water levels to respond to precipitation events.

Document Type

Article

Digital Object Identifier (DOI)

https://doi.org/10.1111/j.1745-6584.2000.tb00221.x

Language

English

Link to Full Text

Share

 
COinS