Diffusivity of a glacial-outwash aquifer by the floodwave- response technique
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Abstract
Aquifer diffusivity (transmissivity divided by storage coefficient) was calculated for three sites in a glacial-autwash valley aquifer near Cortland, New York from water-level fluctuations induced by rises in stream stage. The observed response data were analyzed through use of a one-dimensional floodwave-response model to calculate the theoretical head response in the aquifer generated by a floodwave in the stream, and then matched to the observed head response. Diffusivity values computed from sharply peaked flood rises ranged from 6.08 to 8.68 ft2. The closest match between observed and calculated heads was obtained from a site where the aquifer is confined and the saturated thickness (and thus the diffusivity) remains constant with the passage of a floodwave. Arrival time of the observed flood-peak seems to be the most useful criterion for curve matching, especially under unconfined conditions, where a match to the rising limb and floodpeak is difficult because of changes in the saturated thickness.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Diffusivity of a glacial-outwash aquifer by the floodwave- response technique |
| Series title | Groundwater |
| DOI | 10.1111/j.1745-6584.1987.tb02133.x |
| Volume | 25 |
| Issue | 3 |
| Year Published | 1987 |
| Language | English |
| Publisher | National Groundwater Association |
| Description | 10 p. |
| First page | 290 |
| Last page | 299 |
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