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| Titel |
Continuous pH, electrical conductivity and temperature measurement at Plynlimon: towards an integrated, reliable and low maintenance instrument system |
| VerfasserIn |
P. Hodgson, J. G. Evans |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 1, no. 3 ; Nr. 1, no. 3, S.653-660 |
| Datensatznummer |
250000205
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| Publikation (Nr.) |
 copernicus.org/hess-1-653-1997.pdf |
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| Zusammenfassung |
| Water quality data for the Nant Tanilwyth stream, Plynlimon
(an acidic upland stream, the waters of which are of such low ionic strength that measurement is difficult),
has been recorded using a new integrated field instrument system. The negligible drift of the
pH electrode allows the system to operate for extended periods (months) without re-calibration,
whilst maintaining a standard deviation of 0.19 pH units between its readings and laboratory
reference measurements. Conductivity measurements, although within the sensor manufacturer's
specification, did not provide meaningful readings at conductivities below 50 μS cm-1. Using
the pH data as a surrogate tracer, a high temporal resolution estimate of the stream
dynamics, in terms of the contributions of groundwater and soil-water is presented; the dependence
of these relative proportions on instantaneous flow and antecedent conditions is shown.
It is concluded that, whilst improvements in instrumentation have been made, greater accuracy
is still desirable for some scientific applications and ways forward are described. |
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