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| Titel |
Exploring mobilisation and transport of diffuse substances using multiple sediment and colloid tracers applied to a temperate grassland catchment. |
| VerfasserIn |
S. Granger, J. Hawkins |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250031516
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| Zusammenfassung |
| The mobilisation and transport of diffuse substances from livestock grassland systems to surface water bodies is known to impact aquatic ecology and human health. Diffuse substances include sediment and colloidal material detached from the soil surface and subsurface and colloidal material solubilised by water travelling across and through the soil matrix. Improving understanding of the dominant processes controlling the mobilisation and transport of sediment and colloid associated materials requires the application of established and novel tracing methods.
In this study our objective was to link mobilisation from the plot to head water catchment scales by tracing the movement of slurry material delivered to a first order stream through the application of natural and artificial fluorescence and rare earth oxide (REO) tracing techniques. Slurry treated with fluorescent beads or REO’s was applied to a hydrologically isolated field within a ~40 ha catchment. Novel natural fluorescence techniques were used to assess the presence of dissolved slurry material through the distinctive signature of samples in drainage waters. The particulate phase of slurry was traced using artificial fluorescent beads manufactured to represent two particulate phases of slurry: organic and mineral. The bead treated slurry was applied homogeneously across the entire field. REO treated slurry was applied in five 1 ha contour zones across the field, each zone receiving slurry labelled with different REOs. Surface drainage was monitored and sampled at a v-notch weir placed at the hydrological outlet of the field and at a trapezoidal flume at the catchment outlet. |
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