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| Titel |
Landscape characterization with DAC (DIVIDE AND CAPTURE), a new surface evolution model |
| VerfasserIn |
Liran Goren, Sean Willett |
| 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 |
250055010
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| Zusammenfassung |
| A long lasting challenge in geomorphology is to characterize the geometry and topology of
natural stream channel networks and to identify characteristics that distinguish them from
other tree networks. Moreover, such characterization should also be indicative of the
landscape geology and of the various endogenic and exogenic processes that shape it.
Landscape evolution models allow a straightforward technique for addressing this challenge
since the models’ input is the geology, tectonics, and climate and their output is the
spatio-temporal evolution of a channel network, where the topology and various
geometrical relations of the channel network may be measured. We apply a new
landscape evolution model, DAC (DIVIDE AND CAPTURE), that combines analytic
solution for first order channels together with numerical solution for higher order
channels. DAC solves explicitly for the location of the channels’ divide and allows
divide migration and channel capturing. The analytic solution for the first order
channels combines Hack’s law with a stream power law to solve for channel slope,
and therefore it requires the specification of Hack’s exponent, h. The slope of the
higher order channels is found numerically based on a stream power law and the
measured contributing area. For higher order channel h is not an input but an emergent
property. It is found that in order to fully tile the space, h must be 1 for the first order
channels. It is further observed that this value of h does not percolate to higher
order channels that exhibit 0.5 |
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