- Title
- Digital elevation model error and its effect on modelling soil erosion and catchment geomorphology
- Creator
- Hancock, Gregory R.
- Relation
- Sediment Budgets 2: Proceedings of symposium S1 held during the Seventh IAHS Scientific Assembly at Foz do Iguaçu, Brazil, April 2005. (Foz do Iguaçu, Brazil April 2005)
- Publisher
- IAHS Press
- Resource Type
- conference paper
- Date
- 2005
- Description
- In many cases it is useful and appropriate to assess potential erosion risk both in the undisturbed environment and in catchments heavily disturbed by humans. One method for assessing risk, when modelling environmental processes, is to quantify the error(s) associated with model input parameters and include this in the modelling process. This study examines the impact of digital elevation model (DEM) error on the estimation of soil loss and geomorphological changes in a Northern Territory, Australia catchment. Multiple realizations (or versions) of the same catchment were created by including positional error in the DEM. The SIBERIA erosion model was run for a simulated 1000-year period, using these multiple catchment realizations as this is the expected minimum design life for rehabilitated uranium mines in the area. Examination of the area-slope relationship, hypsometric curve, and cumulative area distribution after 1000 years of simulated erosion demonstrates little geomorphological difference. Statistically significant differences occur when comparing channel network statistics. A probabilistic assessment allows an estimation of the statistical ranges of incision and average erosion.
- Subject
- Soil mechanics; Geomorphology; Catchments; Risk assessment; Error analysis; Statistical methods; Mathematical models; Computer simulation; Erosion
- Identifier
- uon:227
- Identifier
- http://hdl.handle.net/1959.13/25068
- Identifier
- ISBN:1-901502-92-9
- Language
- eng
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