Hydrological mediated denitrification in groundwater below a seasonal flooded restored riparian zone
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Hydrological mediated denitrification in groundwater below a seasonal flooded restored riparian zone. / Jensen, Jannick Kolbjørn; Engesgaard, Peter; Johnsen, Anders R.; Marti, Vicens; Nilsson, Bertel.
I: Water Resources Research, Bind 53, Nr. 3, 2017, s. 2074-2094.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Hydrological mediated denitrification in groundwater below a seasonal flooded restored riparian zone
AU - Jensen, Jannick Kolbjørn
AU - Engesgaard, Peter
AU - Johnsen, Anders R.
AU - Marti, Vicens
AU - Nilsson, Bertel
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Denitrification
KW - Flooding
KW - Hot moments
KW - Hot spots
KW - Riparian zones
U2 - 10.1002/2016WR019581
DO - 10.1002/2016WR019581
M3 - Journal article
AN - SCOPUS:85015201475
VL - 53
SP - 2074
EP - 2094
JO - Water Resources Research
JF - Water Resources Research
SN - 0043-1397
IS - 3
ER -
ID: 176954587