The sensitivity of catchment hypsometry and hypsometric properties to DEM resolution and polynomial order
| Autor: | Joel Liffner, GA Hewa, Murray C. Peel |
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| Přispěvatelé: | Liffner, Joel W, Hewa, Guna A, Peel, Murray C |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Hypsometry
geography Polynomial geography.geographical_feature_category 010504 meteorology & atmospheric sciences hypsometric properties 0208 environmental biotechnology Drainage basin 02 engineering and technology Geodesy 01 natural sciences catchment hypsometry geospatial analysis 020801 environmental engineering Hypsometric curve Sample size determination Sensitivity (control systems) DEM resolution Representation (mathematics) Digital elevation model Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Popis: | Derivation of the hypsometric curve of a catchment, and properties relating to that curve, requires both use of topographical data (commonly in the form of a Digital Elevation Model - DEM), and the estimation of a functional representation of that curve. An early investigation into catchment hypsometry concluded 3rd order polynomials sufficiently describe the hypsometric curve, without the consideration of higher order polynomials, or the sensitivity of hypsometric properties relating to the curve. Another study concluded the hypsometric integral (HI) is robust against changes in DEM resolution, a conclusion drawn from a very limited sample size. Conclusions from these earlier studies have resulted in the adoption of methods deemed to be "sufficient" in subsequent studies, in addition to assumptions that the robustness of the HI extends to other hypsometric properties. This study investigates and demonstrates the sensitivity of hypsometric properties to DEM resolution, DEM type and polynomial order through assessing differences in hypsometric properties derived from 417 catchments and sub-catchments within South Australia. The sensitivity of hypsometric properties across DEM types and polynomial orders is found to be significant, which suggests careful consideration of the methods chosen to derive catchment hypsometric information is required. Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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