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URN: urn:nbn:de:kobv:517-opus-44924
URL: http://opus.kobv.de/ubp/volltexte/2010/4492/

Blume, Theresa ; Zehe, Erwin ; Bronstert, Axel

Use of soil moisture dynamics and patterns at different spatio-temporal scales for the investigation of subsurface flow processes

Dokument 1.pdf (14.447 KB) (SHA-1:e86bc0a747853bc6edc2ecd762891efa044f4f69)

Kurzfassung auf Englisch

Spatial patterns as well as temporal dynamics of soil moisture have a major influence on runoff generation. The investigation of these dynamics and patterns can thus yield valuable information on hydrological processes,
especially in data scarce or previously ungauged catchments.
The combination of spatially scarce but temporally high resolution soil moisture profiles with episodic and thus temporally scarce moisture profiles at additional locations provides information on spatial as well as temporal patterns of soil moisture at the hillslope transect scale. This approach is better suited to difficult terrain (dense forest, steep slopes) than geophysical techniques and at the same time less cost-intensive than a high resolution grid of continuously measuring sensors. Rainfall simulation experiments with dye tracers while continuously monitoring soil moisture
response allows for visualization of flow processes in the unsaturated
zone at these locations. Data was analyzed at different spacio-temporal scales using various graphical methods, such as space-time colour maps (for the event and plot scale) and binary indicator maps (for the long-term and hillslope
scale). Annual dynamics of soil moisture and decimeterscale variability were also investigated. The proposed approach proved to be successful in the investigation of flow processes in the unsaturated zone and showed the importance of preferential flow in the Malalcahuello Catchment, a datascarce
catchment in the Andes of Southern Chile. Fast response times of stream flow indicate that preferential flow observed at the plot scale might also be of importance at the hillslope or catchment scale. Flow patterns were highly variable in space but persistent in time. The most likely explanation
for preferential flow in this catchment is a combination of hydrophobicity, small scale heterogeneity in rainfall due to redistribution in the canopy and strong gradients in unsaturated conductivities leading to self-reinforcing flow paths.

Freie Schlagwörter (englisch): Repellent sandy soil , Poorly gauged catchment , Volcanic ash soils , Water repellency , Preferential flow
Institut: Institut für Geoökologie
DDC-Sachgruppe: Geowissenschaften
Dokumentart: c Postprint
Schriftenreihe: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, ISSN 1866-8372
Band Nummer: paper 125
Quelle: Hydrology and earth system sciences 13 (2009), 7, S. 1215 - 1233
Sprache: Englisch
Erstellungsjahr: 2009
Publikationsdatum: 16.07.2010
The article was originally published by Copernicus Publications:
Hydrology and Earth System Sciences. - 13 (2009), 7, S. 1215-1233
ISSN 1027-5606
Lizenz: Dieses Werk ist unter einer Creative Commons-Lizenz lizenziert.
Lizenz-Logo  Creative Commons - Namensnennung, 3.0 Deutschland

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