|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 4 van 25 gevonden artikelen
| Titel: |
Comparative pump test analysis of a multiple bore array in a thin unconfined aquifer |
| Auteur: |
Cromer, W. C. Leaman, D. E. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 27 (1980) nr. 1-2 pagina's 105-116 |
| Jaar: |
1980-09 |
| Inhoud: |
Standard aquifer tests have been applied to the results of a 13-day pump test on a circular array of 12 bores in a thin unconfined aquifer in northern Tasmania. During pumping the array behaves in a manner similar to a large diameter bore. By assuming that it is also hydrologically equivalent to a central imaginary bore, all the techniques produce 'acceptable' values for transmissivity and specific yield. Values of T in the range 56-99 m2/day and S in the range 0.16-0.29 are indicated. Independent assessment of S using a method developed from first principles yields a value as high as 0.33. No further refinement is possible, although drawdowns are accurate to the nearest millimetre and were measured in 13 observation bores. Each individual method of analysis produces apparently precise results, but the inherent imprecision of all standard techniques is obvious when a comparative approach is adopted. Although T and S are probably reasonably constant throughout the aquifer, 'correct' values were only approached after long pumping times. The duration of the pump test remains a more critical factor in calculating T and S than the method of analysis. A simple empirical prediction theory has been developed (at this stage for the Tas-manian aquifer only) which describes the drawdown configuration around any number of bores for any spatial arrangement, and which is independent of the imprecisely known T and S values obtained from formal analysis. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 25 gevonden artikelen
| << vorige | volgende >> |