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| Titel |
A structure generator for modelling the initial sediment distribution of an artificial hydrologic catchment |
| VerfasserIn |
T. Maurer, A. Schneider, H. H. Gerke |
| 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 ; 15, no. 12 ; Nr. 15, no. 12 (2011-12-01), S.3617-3638 |
| Datensatznummer |
250013045
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| Publikation (Nr.) |
 copernicus.org/hess-15-3617-2011.pdf |
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| Zusammenfassung |
| Artificially-created hydrological catchments are characterised by sediment
structures from technological construction processes that can potentially be
important for modelling of flow and transport and for understanding initial
soil and ecosystem development. The subsurface spatial structures of such
catchments have not yet been sufficiently explored and described. Our
objective was to develop a structure generator programme for modelling the
3-D spatial distribution patterns of dumped sediments depending on the
technical earth-moving and deposition processes. We are focussing in a first
step on integrating sediment dumping, particle size, and bulk density
modification processes on the catchment scale. For the model development,
the artificially-constructed hydrological catchment "Chicken Creek"
located in Lower Lusatia, Germany, served as an example. The structure
generator describes 3-D technological sediment distributions at two scales: (i) for a 2-D-vertical cross-section, texture and bulk density distributions are
generated within individual spoil cones that result from mass dumping,
particle segregation, and compaction and (ii) for the whole catchment, the spoil
cones are horizontally arranged along trajectories of mass dumping
controlled by the belt stacker-machine relative to the catchment's clay
layer topography. The generated 3-D texture and bulk density distributions
are interpolated and visualised as a gridded 3-D-volume body using 3-D
computer-aided design software. The generated subsurface sediment
distribution for the Chicken Creek catchment was found to correspond to
observed patterns already without calibration. Spatial aggregation and
interpolation in the gridded volume body modified the generated
distributions towards more uniform (unimodal) distributions and lower values
of the standard deviations. The modelling approach is generally applicable
to all situations where large masses of unconsolidated sediment are moved
and dumped thereby allowing generation of basic soil structures and patterns
of hydrological systems. |
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