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| Titel |
Comparing the accuracy of several field methods for measuring gully erosion |
| VerfasserIn |
C. Castillo, R. Pérez, M. R. James, J. N. Quinton, E. V. Taguas, J. A. Gómez |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068902
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| Zusammenfassung |
| Most field erosion studies in agricultural areas provide little information on the probable
errors associated. The aim of this paper is to evaluate the accuracy of different methods
(LiDAR, photo-reconstruction, total station, laser profilemeter and pole) estimating gully
erosion at a reach scale and the expected errors when 2D methods are used at gully scale.
Field measurements of a reach 7.1 m long and nine gullies (100s m) were carried out near
Cordoba, Spain. At the reach scale, the cross sectional area EA and reach volume
EV errors were calculated. Sinuosity and measurement distance (D)influence on
gully length error (EL) was investigated. Multiple configurations of gully cross
sectional area were simulated to assess volume error variability (ÏăEv) as a function of
measurement distance factor (MDF) and to obtain a EV confidence interval for a given
probability.
3D photo-reconstruction and total station produced EA values lower than 4%, whereas
the remainder of the 2D methods, greater than 10%. For volume estimation, 3D
methods deliver similar values, but 2D methods generated large negative EV values
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