Simulation and comparison of stream power in-channel and on the floodplain in a German lowland area

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Title:Simulation and comparison of stream power in-channel and on the floodplain in a German lowland area
Creators:
Song, Song; ssong at hydrology dot uni-kiel dot de; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Schmalz, Britta; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Fohrer, Nicola; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 62, 2, pp. 133-144
Uncontrolled Keywords:HEC-RAS model, in-channel flow, floodplain flow, unit stream power, inundation area

Abstract

Extensive lowland floodplains cover substantial parts of the glacially formed landscape of Northern Germany. Stream power is recognized as a force of formation and development of the river morphology and an interaction system between channel and floodplain. In order to understand the effects of the river power and flood power, HEC-RAS models were set up for ten river sections in the Upper Stör catchment, based on a 1 m digital elevation model and field data, sampled during a moderate water level period (September, 2011), flood season (January, 2012) and dry season (April, 2012). The models were proven to be highly efficient and accurate through the seasonal roughness modification. The coefficients of determination (R2) of the calibrated models were 0.90, 0.90, 0.93 and 0.95 respectively. Combined with the continuous and long-term data support from SWAT model, the stream power both in-channel and on the floodplain was analysed. Results show that the 10-year-averaged discharge and unit stream power were around 1/3 of bankfull discharge and unit power, and the 10-year-peak discharge and unit stream power were nearly 1.6 times the bankfull conditions. Unit stream power was proportional to the increase of stream discharge, while the increase rate of unit in-channel stream power was 3 times higher than that of unit stream power on the floodplain. Finally, the distribution of the hydraulic parameters under 10-years-peak discharge conditions was shown, indicating that only 1–10% of flow stream was generated by floodplain flow, but 40–75% volume of water was located on the floodplain. The variation of the increasing rate of the stream power was dominated by the local roughness height, while the stream power distributed on the floodplain mainly depended on the local slope of the sub-catchment.

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Title:Simulation and comparison of stream power in-channel and on the floodplain in a German lowland area
Translated title:Simulation and comparison of stream power in-channel and on the floodplain in a German lowland area
Creators:
Song, Song; ssong at hydrology dot uni-kiel dot de; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Schmalz, Britta; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Fohrer, Nicola; Department of Hydrology and Water Resources Management, Institute for Natural Resource Conservation, University of Kiel, Olshausenstr. 75, 24118 Kiel, Germany.
Uncontrolled Keywords:HEC-RAS model, in-channel flow, floodplain flow, unit stream power, inundation area
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:62
Number:2
Page Range:pp. 133-144
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8196
Item Type:Article
Deposited On:05 Jun 2014 18:31
Last Modified:05 Jun 2014 16:31

Citation

Song, Song; Schmalz, Britta; Fohrer, Nicola (2014) Simulation and comparison of stream power in-channel and on the floodplain in a German lowland area. Journal of Hydrology and Hydromechanics, 62 (2). pp. 133-144. ISSN 0042-790X

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