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Seasonality of Roughness - the Indicator of Annual River Flow Resistance Condition in a Lowland Catchment

Author

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  • S. Song

    (Nanjing University
    University of Kiel)

  • B. Schmalz

    (University of Kiel
    Technical University of Darmstadt)

  • Y. P. Xu

    (Nanjing University)

  • N. Fohrer

    (University of Kiel)

Abstract

Accurate estimation of flow resistance restricts the quality of the hydraulic model performance. In this study, we try to investigate the seasonal dynamic of the Manning’s roughness coefficient (n) based on the one-dimensional hydraulic model HEC-RAS in a German lowland area. We set up four river section models based on the 1 m digital elevation model and field measurements, in which the seasonal roughness factors were calibrated and validated with the gauge record. The results revealed that: 1) the Manning’s n varied from 46% to 135% from the base value in autumn; 2) adopting the seasonal roughness factor improved the quality of the model output; 3) the vegetation condition and water elevation dominated the Manning’s n in summer (April–September) and winter (October–March) half year respectively. Water temperature increased the flow resistence in winter half year; 4) the peak value of Manning’s n appeared in late summer due to the highest biomass, while the minimum roughness occurred in early-spring because of the combined influence of low biomass, high water level and relatively higher temperature. The involvement of seasonal roughness factor improved the model performance and the results are comparable to the previous research of the same area.

Suggested Citation

  • S. Song & B. Schmalz & Y. P. Xu & N. Fohrer, 2017. "Seasonality of Roughness - the Indicator of Annual River Flow Resistance Condition in a Lowland Catchment," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(11), pages 3299-3312, September.
    • Handle: RePEc:spr:waterr:v:31:y:2017:i:11:d:10.1007_s11269-017-1656-z
    DOI: 10.1007/s11269-017-1656-z
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    References listed on IDEAS

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    1. Mohammad Shahrokhnia & Mahmood Javan, 2007. "Influence of roughness changes on offtaking discharge in irrigation canals," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 21(3), pages 635-647, March.
    2. Vassilios Tsihrintzis & Edgar Madiedo, 2000. "Hydraulic Resistance Determination in Marsh Wetlands," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 14(4), pages 285-309, August.
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    Cited by:

    1. Saeid Okhravi & Radoslav Schügerl & Yvetta Velísková, 2022. "Flow Resistance in Lowland Rivers Impacted by Distributed Aquatic Vegetation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(7), pages 2257-2273, May.

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