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- Title
Spatial variability in floodplain sedimentation: the use of generalized linear mixed-effects models.
- Authors
Cabezas, A.; Angulo-Martínez, M.; Gonzalez-Sanchís, M.; Jimenez, J. J.; Comín, F. A.
- Abstract
Sediment, Total Organic Carbon (TOC) and total nitrogen (TN) accumulation during one overbank flood (1.15 y) were examined at one reach of the Middle Ebro River (NE Spain) for elucidating spatial patterns. To achieve this goal, four areas with different 5 geomorphological features and located within the study reach were examined by using artificial grass mats. Within each area, 1m² study plots consisting on three pseudoreplicates were placed in a semi-regular grid oriented perpendicular to the main channel. TOC, TN and Particle-Size composition of deposited sediments were examined and accumulation rates estimated. Generalized linear mixed-effects models were used 10 to analyze sedimentation patterns in order to handle clustered sampling units, specificsite effects and spatial self-correlation between observations. Our results confirm the importance of channel-floodplain morphology and site micro-topography in explaining sediment, TOC and TN deposition patterns, although the importance of another factors as vegetation morphology should be included in further studies to explain small scale 15 variability. Generalized linear mixed-effect models provide a good framework to deal with the high spatial heterogeneity of this phenomenon at different spatial scales, and should be further investigated in order to explore its validity when examining the importance of factors such as flood magnitude or suspended sediment solid concentration.
- Subjects
EBRO River (Spain); SPAIN; FLOODPLAINS; SEDIMENTATION &; deposition; VEGETATION &; climate; FLOODS
- Publication
Hydrology & Earth System Sciences Discussions, 2010, Vol 7, Issue 1, p1589
- ISSN
1812-2108
- Publication type
Article
- DOI
10.5194/hessd-7-1589-2010