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Accueil du site → Doctorat → Allemagne → 2016 → Photogrammetric techniques for across-scale soil erosion assessment. Developing methods to integrate multi-temporal high resolution topography data at field plots

Technische Universität Dresden (2016)

Photogrammetric techniques for across-scale soil erosion assessment. Developing methods to integrate multi-temporal high resolution topography data at field plots

Eltner, Anette

Titre : Photogrammetric techniques for across-scale soil erosion assessment. Developing methods to integrate multi-temporal high resolution topography data at field plots

Auteur : Eltner, Anette

Université de soutenance : Technische Universität Dresden

Grade : Doktor ingenieur (Dr.-Ing.) 2016

Présentation

Soil erosion is a complex geomorphological process with varying influences of different impacts at different spatio-temporal scales. To date, measurement of soil erosion is predominantly realisable at specific scales, thereby detecting separate processes, e.g. interrill erosion contrary to rill erosion. It is difficult to survey soil surface changes at larger areal coverage such as field scale with high spatial resolution. Either net changes at the system outlet or remaining traces after the erosional event are usually measured. Thus, either quasi-point measurements are extrapolated to the corresponding area without knowing the actual sediment source as well as sediment storage behaviour on the plot or erosion rates are estimated disrupting the area of investigation during the data acquisition impeding multi-temporal assessment. Furthermore, established methods of soil erosion detection and quantification are typically only reliable for large event magnitudes, very labour and time intense, or inflexible.

To better observe soil erosion processes at field scale and under natural conditions, the development of a method is necessary, which identifies and quantifies sediment sources and sinks at the hillslope with high spatial resolution and captures single precipitation events as well as allows for longer observation periods. Therefore, an approach is introduced, which measures soil surface changes for multi-spatio-temporal scales without disturbing the area of interest. Recent advances regarding techniques to capture high resolution topography (HiRT) data led to several promising tools for soil erosion measurement with corresponding advantages but also disadvantages. The necessity exists to evaluate those methods because they have been rarely utilised in soil surface studies.

Mots clés  : Photogrammetry, Soil Erosion, TLS, SfM, Geomorphology — Photogrammetrie, Bodenerosion, TLS, SfM, Geomorphologie

Résumé de la thèse (QUCOSA)

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Page publiée le 26 novembre 2016