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URN: urn:nbn:de:kobv:517-opus-16948
URL: http://opus.kobv.de/ubp/volltexte/2008/1694/


Elsenbeer, Helmut ; Lorieri, Daniel ; Bonell, Mike

Mixing model approaches to estimate storm flow sources in an overland flow-dominated tropical rain forest catchment

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Kurzfassung in Englisch

Previous hydrometric studies demonstrated the prevalence of overland flow as a hydrological pathway in the tropical rain forest catchment of South Creek, northeast Queensland. The purpose of this study was to consider this information in a mixing analysis with the aim of identifying sources of, and of estimating their contribution to, storm flow during two events in February 1993. K and acid-neutralizing capacity (ANC) were used as tracers because they provided the best separation of the potential sources, saturation overland flow, soil water from depths of 0.3, 0.6, and 1.2 m, and hillslope groundwater in a two-dimensional mixing plot. It was necessary to distinguish between saturation overland flow, generated at the soil surface and following unchanneled pathways, and overland flow in incised pathways. This latter type of overland flow was a mixture of saturation overland flow (event water) with high concentrations of K and a low ANC, soil water (preevent water) with low concentrations of K and a low ANC, and groundwater (preevent water) with low concentrations of K and a high ANC. The same sources explained the streamwater chemistry during the two events with strongly differing rainfall and antecedent moisture conditions. The contribution of saturation overland flow dominated the storm flow during the first, high-intensity, 178-mm event, while the contribution of soil water reached 50% during peak flow of the second, low-intensity, 44-mm event 5 days later. This latter result is remarkably similar to soil water contributions to storm flow in mountainous forested catchments of the southeastern United States. In terms of event and preevent water the storm flow hydrograph of the high-intensity event is dominated by event water and that of the low-intensity event by preevent water. This study highlights the problems of applying mixing analyses to overland flow-dominated catchments and soil environments with a poorly developed vertical chemical zonation and emphasizes the need for independent hydrometric information for a complete characterization of watershed hydrology and chemistry.

Freie Schlagwörter (Englisch): SOILWATER END-MEMBERS , HYDROGRAPH SEPARATION , STREAMWATER CHEMISTRY , ACIDIFICATION , MIXTURE , TRACERS , EVENTS
Institut 1: Institut für Geoökologie
Institut 2: Extern
DDC-Sachgruppe: Geowissenschaften
Dokumentart: c Postprint
Schriftenreihe: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, ISSN 1866-8372
Bandnummer: paper 048
Quelle: Water Resources Research. - 31 (1995), 9, p. 2267 – 2278. - ISSN 0043-1397
Sprache: Englisch
Erstellungsjahr: 1995
Publikationsdatum: 28.03.2008
Bemerkung:
first published in:
Water Resources Research - 31 (1995), 9, p. 2267 – 2278
ISSN: 0043-1397
Lizenz: Diese Nutzungsbedingung gilt nicht, wenn in den Metadaten eine modifizierende Lizenz genannt ist. Keine Nutzungslizenz vergeben - es gilt das deutsche Urheberrecht


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