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Interpretation of borehole impulse tests at Haut Glacier d’Arolla, Switzerland
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kulessa, Bernd Hubbard, Bryn |
| Copyright Year | 1997 |
| Abstract | One hundred and sixteen impulse tests were conducted in a dense borehole array at Haut Glacier d'Arolla, Switzerland, duringJuly and August 1995. Impulsetest response pressure oscillations reveal marked variations in three parameters: relative amplitude decay, osci llation frequency and net water-level displacement. Analysis of response signals from water-filled boreholes indicates that (i) responses from individual boreholes are reproducible over some tens of minutes; (ii ) responses are similar, but not identical, for slug insertion ("slug tests" ) and removal ("bail tests" ); (iii ) signal amplitude decay varies with the depth at which the recording pressure transducer is located in a borehole; and (iv) coherent minima in all three response parameters coincide with the location of a known preferential, subglacial water-flow pathway. This correspondence suggests, first , that water-filled and non-fluctuating boreholes have established a link to the subglacial aquifer at Haut Glacier d'Arolla and, secondly, that locally transmissive basal sediments may be idel1lified by relatively low response-signal frequencies, response-signal decays and net water-level displacemem s. Impulse testing water-filled bO~'eholes ther~fore has the capacity to provide information relating to the local hydrogeologlcal propertI es of subglacial aquifers. In 43 cases, water levels in boreholes adjacent to those being tested were recorded in order to identify possible subglaciallinkages. No such connections were detected. |
| Starting Page | 397 |
| Ending Page | 402 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| DOI | 10.1017/S0260305500012507 |
| Alternate Webpage(s) | https://www.igsoc.org/annals/24/igs_annals_vol24_year1997_pg397-402.pdf |
| Alternate Webpage(s) | https://doi.org/10.1017/S0260305500012507 |
| Volume Number | 24 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
