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| Titel |
Description of suspended sediments and three phosphorus forms concentrations at the outlet of an agroforestry catchment by multifractal parameters |
| VerfasserIn |
Patricia Sande, José Manuel Mirás Avalos, Antonio Paz González |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250057021
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| Zusammenfassung |
| Suspended sediment and total, sedimentary and soluble phosphorus concentrations were
sampled at irregular intervals at the outlet of the Valiñas agroforestry catchment, during
ten years, from 2000 to 2009. The Valiñas catchment is located near La Coruña,
Spain and its surface is 35 km2.The yearly number of samples was between 59
and 193. The main characteristics of sediment and phosphorus transport were as
follows: i) a few events of intensive precipitation are responsible for most of the yearly
transport of suspended sediment and particles, mobilising sediments from different
source areas, ii) peaks of particulate P concentration occur at the beginning of each
event and decrease before the maximum of water discharge, iii) the total P exported
during stormflow is mainly composed of particulate-P and iv) During base flow
periods dissolved P the ratio dissolved P / total P increased. All the four variables
series showed multifractal behaviour at the scale of one year. There were significant
differences between multifractal parameters obtained for the three studied phosphorus
forms. For example, in general the entropy dimension, D1, was higher for dissolved
phosphorus and lower for sedimentary phosphorus. We tried to relate the resulting
multifractal parameters with erosion factors such as rainfall and soil surface cover. |
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