NDLI: Active versus potential floodplains–the effect of small flood events on nutrient retention along the river Elbe corridor (Germany)

Content Provider	Springer Nature Link
Author	Natho, S. Vehr, M.
Copyright Year	2014
Abstract	Riparian floodplains are known to retain nutrients such as nitrogen and phosphorus. The main processes are denitrification (for nitrogen) and sedimentation (for phosphorus), which depend on the nutrient load and the flow velocity or residence time, respectively. Both are related to floodplain size and the current discharge conditions. However, it is not yet known, to which extent, how long and how often during a year riparian floodplains are inundated at the catchment scale. Small floods are not relevant for flood risk management, but they are important for the nutrient cycle. This study examined the flooding frequency, the extent and nutrient retention capacity of inundated riparian floodplains between Wittenberg and Wittenberge along the river Elbe in Germany, based on freely available data. The calculation of inundated areas was produced by the Software FLYS 2.1.3. On the basis of these results, we developed an empirical approach to predict the average yearly active floodplain as a share of the inundated floodplain on the potential floodplain depending on hydro-morphology. This hydrology dependent approach was applied to calculate the active floodplain as an average inundated floodplain area and coupled with a proxy-based nutrient retention calculation. Due to morphologic characteristics, riparian floodplains upstream and downstream from Magdeburg show significant differences in flooding frequencies, average inundated floodplain extent and floodplain widths. Assuming this average inundated floodplain as relevant for nutrient retention, we calculated an eight-fold higher retention for the downstream river section, despite a smaller potential floodplain, indicating how important regularly flooded areas are. The presented Q/MQ approach offers new options for modeling nutrient retention in floodplains even on a monthly basis and for other river systems. However, there is a strong need to consider the inflowing nutrient load for retention calculation instead of proxy values.
Starting Page	633
Ending Page	642
Page Count	10
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	76
Issue Number	4
e-ISSN	14209055
Language	English
Publisher	Springer Basel
Publisher Date	2014-07-24
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flooding frequency Spatial and temporal dynamics Active floodplain Water quality Ecosystem service Freshwater & Marine Ecology Marine & Freshwater Sciences Oceanography Ecology Life Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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