Combining Satellite Multispectral Imagery and Topographic Data for the Detection and Mapping of Fluvial Avulsion Processes in Lowland Areas
| Autor: | Daniela Piacentini, Paolo Mazzanti, Giulia Iacobucci, Francesco Troiani, Salvatore Milli, Marta Zocchi, Davide Nadali |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
geography
crevasse splays geography.geographical_feature_category 010504 meteorology & atmospheric sciences Floodplain Landform Science avulsion processes Multispectral image relief analysis Elevation Fluvial Multispectral analysis Mesopotamian plain 010502 geochemistry & geophysics 01 natural sciences Crevasse splay Crevasse multispectral analysis General Earth and Planetary Sciences Physical geography Geology Beach morphodynamics 0105 earth and related environmental sciences |
| Zdroj: | Remote Sensing; Volume 12; Issue 14; Pages: 2243 Remote Sensing, Vol 12, Iss 2243, p 2243 (2020) |
| ISSN: | 2072-4292 |
| DOI: | 10.3390/rs12142243 |
| Popis: | Fluvial avulsion is an important process in the dynamics of the riverscapes and plays a key role in the drainage network evolution in lowland areas, also influencing past and present social processes and economic activities. Crevasse splays represent significant geomorphological features for understanding the fluvial morphodynamics in lowland areas dominated by avulsion processes. Within wide floodplains characterized by very low elevation ranges, the detection and accurate mapping of crevasse splay morphology and features, such as crevasse channels, levees, and deposit, can be very challenging considering floodplain extension, anthropic impact on the natural channels network, logistic difficulties, and in some cases, climate conditions that prevent field work. This research aims at improving the detection and mapping of crevasse splays in lowland areas through the combination of different remote sensing techniques based on optical multispectral imagery and topographic data derived from satellite earth observation missions. The Lower Mesopotamia Plain (LMP) offers a unique opportunity to study the avulsion processes because it presents numerous examples of crevasse splays, characterized by different sizes and states of activity. Furthermore, in this area, a strong correlation exists between the formation and development of crevasse splays and the expansion of agriculture and early societies since the Early Holocene. Different supervised classification (SC) methods of Landsat 8 satellite images have been tested together with topographic analysis of the microrelief, carried out based on two different 1-arcsec DEMs (AW3D30 and GDEM2). The results of this study demonstrate that the combination of multispectral imagery analysis and topographic analysis of the microrelief is useful for discerning different crevasse elements, distinguishing between active and relict landforms. The methodological approach proved helpful for improving the mapping of erosional and depositional landforms generated by the avulsion process and, in the study area, provided the best results for the active landforms. |
| Databáze: | OpenAIRE |
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