Hydrological mediated denitrification in groundwater below a seasonal flooded restored riparian zone

Jannick Kolbjørn Jensen, Peter Engesgaard, Anders R. Johnsen, Vicens Marti, Bertel Nilsson

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

20 Citationer (Scopus)

Abstrakt

A restored riparian zone was characterized to understand the effects of flooding on subsurface hydrological flow paths and nitrate removal in groundwater. Field and laboratory investigations were combined with numerical modeling of dynamic flow and reactive nitrate transport. Flooding enhances nitrate removal in groundwater primarily by two mechanisms. First, by creating a stagnant flow zone beneath the flooded area thereby increasing the residence time and leaving more time for nitrate removal. Secondly, nitrate removal is increased by enhancing upward flow into the highly reactive organic-rich top layers. Flooding therefore contributes to nitrate removal in “hot spots”, where nitrate is transported to the peat and during “hot moments”, when flow is stagnant. The permeability of the capping peat layer relative to the aquifer is important as it controls both mechanisms. The model shows that the deep-seated nitrate removal is greater than projected from the laboratory nitrate reduction experiments.

OriginalsprogEngelsk
Sider (fra-til)2074-2094
Antal sider21
TidsskriftWater Resources Research
Vol/bind53
Udgave nummer3
DOI
StatusUdgivet - 1 mar. 2017

Programområde

  • Programområde 2: Vandressourcer

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