Numerical modeling of nitrate removal in anoxic groundwater during river flooding of riparian zones

Jannick Kolbjørn Jensen, Bertel Nilsson, Peter Engesgaard

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

1 Citationer (Scopus)

Abstrakt

A numerical study demonstrates the effects of flooding on subsurface hydrological flowpaths and nitrate removal in anoxic groundwater in riparian zones with a top peat layer. A series of two-dimensional numerical simulations with changing conditions for flow (steady state or transient with flooding), hydrogeology, denitrification, and duration of flooding demonstrate how flowpaths, residence times, and nitrate removal are affected. In periods with no flooding groundwater flows horizontally and discharges to the river through the riverbed. During periods with flooding, shallow groundwater is forced upwards as discharge through peat layers that often have more optimal conditions for denitrification caused by the presence of highly reactive organic matter. The contrast in hydraulic conductivity between the sand aquifer and the overlying peat layer, as well as the flooding duration, have a significant role in determining the degree of nitrate removal.

OriginalsprogEngelsk
Sider (fra-til)866-877
Antal sider12
TidsskriftGroundwater
Vol/bind59
Udgave nummer6
DOI
StatusUdgivet - 1 nov. 2021

Emneord

  • riparian zone
  • nitrate
  • river flooding

Programområde

  • Programområde 2: Vandressourcer

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