Transport and deposition of fine sediment in a channel partly covered by flexible vegetation

Walter Box*, Kaisa Västilä, Juha Järvelä

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliConference articleScientificvertaisarvioitu

3 Sitaatiot (Scopus)
91 Lataukset (Pure)

Abstrakti

Riparian plants exert flow resistance and largely influence the flow structure, which affects erosion, deposition and transport processes of fine sediments. Predicting these vegetative effects is important for flood, sediment and nutrient management. However, predictions on the fate of sediments are complicated by uncertainties associated with the suitable parameterization of natural plants and the associated effects on the turbulent flow field and on the variables in the transport equations. The aim of this study is to quantify deposition and transport of fine sandy sediment in a partly vegetated channel under laboratory conditions. Care was taken to reproduce conditions typical of vegetated floodplain flows including dense flexible grassy understory as a starting point. The experiments were conducted in a flume that is specifically designed to recirculate fine sediment. We measured suspended sediment concentrations with optical turbidity sensors and determined patterns of net deposition over the vegetated parts of the cross section. The flow field was determined with acoustic Doppler velocimetry. Our investigations are intended to improve future predictions of fine sediment storage and transport in natural or constructed vegetated channels, and the first results reported herein were useful in designing further, on-going experiments with complex combinations of vegetation and channel geometry. Key words: sediment transport, suspended sediment, deposition, riparian vegetation, flow field.

AlkuperäiskieliEnglanti
Artikkeli02016
Sivumäärä8
JulkaisuE3S Web of Conferences
Vuosikerta40
DOI - pysyväislinkit
TilaJulkaistu - 5 syyskuuta 2018
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Conference on Fluvial Hydraulics - Lyon-Villeurbanne, Ranska
Kesto: 5 syyskuuta 20188 syyskuuta 2018
Konferenssinumero: 9

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