Nutrient exchange between surface water and subsurface water in a ponded shallow reservoir of a suburban river catchment

Yuta Shimizu, Shin Ichi Onodera, Mitsuyo Saito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This research aims to clarify the nutrient exchange processes within the reservoir of a suburban river by considering the interaction between subsurface water and river water. The vertical distributions of nutrient concentrations in the water column and sediment pore water indicate a large concentration gradient of dissolved nitrogen and phosphorus across the water-sediment interface. NO 3 --N dominates in the water column, whereas NH 4 +-N and P0 4 2--P dominate in the sediment pore water. The hydraulic gradient between the surface water and pore water in the sediment indicates that advection from the water column to the sediment occurs throughout the year, hence confirming surface water infiltration in this reservoir. Estimation of diffusive and advective nutrient flux showed that diffusive fluxes of NH 4 +-N and PO 4 2--P are larger than advective fluxes and that this reservoir acts as a source of these components for the river system. However, diffusive fluxes of NO 3 --N and N0 2 --N indicated a downward (water column to sediment) flux (i.e. same direction as advective fluxes) as NO 3 --N and N0 2 --N are attenuated by denitrification near the surface sediment. This result suggests the reservoir works as an attenuation zone for nitrogen.

Original languageEnglish
Title of host publicationIAHS-AISH Publication
Pages37-41
Number of pages5
Volume345
Publication statusPublished - 2011
Externally publishedYes
EventSymposium H01 on Conceptual and Modelling Studies of Integrated Groundwater, Surface Water, and Ecological Systems, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011 - Melbourne, VIC, Australia
Duration: Jun 28 2011Jul 7 2011

Other

OtherSymposium H01 on Conceptual and Modelling Studies of Integrated Groundwater, Surface Water, and Ecological Systems, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011
CountryAustralia
CityMelbourne, VIC
Period6/28/117/7/11

Fingerprint

catchment
surface water
nutrient
water column
river
sediment
porewater
water
nitrogen
sediment-water interface
river system
river water
denitrification
vertical distribution
advection
infiltration
phosphorus
hydraulics

Keywords

  • Advection
  • Diffusion
  • Nutrient
  • Small reservoir
  • Suburban river

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Nutrient exchange between surface water and subsurface water in a ponded shallow reservoir of a suburban river catchment. / Shimizu, Yuta; Onodera, Shin Ichi; Saito, Mitsuyo.

IAHS-AISH Publication. Vol. 345 2011. p. 37-41.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Shimizu, Y, Onodera, SI & Saito, M 2011, Nutrient exchange between surface water and subsurface water in a ponded shallow reservoir of a suburban river catchment. in IAHS-AISH Publication. vol. 345, pp. 37-41, Symposium H01 on Conceptual and Modelling Studies of Integrated Groundwater, Surface Water, and Ecological Systems, Held During the 25th General Assembly of the International Union of Geodesy and Geophysics, IUGG 2011, Melbourne, VIC, Australia, 6/28/11.
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N2 - This research aims to clarify the nutrient exchange processes within the reservoir of a suburban river by considering the interaction between subsurface water and river water. The vertical distributions of nutrient concentrations in the water column and sediment pore water indicate a large concentration gradient of dissolved nitrogen and phosphorus across the water-sediment interface. NO 3 --N dominates in the water column, whereas NH 4 +-N and P0 4 2--P dominate in the sediment pore water. The hydraulic gradient between the surface water and pore water in the sediment indicates that advection from the water column to the sediment occurs throughout the year, hence confirming surface water infiltration in this reservoir. Estimation of diffusive and advective nutrient flux showed that diffusive fluxes of NH 4 +-N and PO 4 2--P are larger than advective fluxes and that this reservoir acts as a source of these components for the river system. However, diffusive fluxes of NO 3 --N and N0 2 --N indicated a downward (water column to sediment) flux (i.e. same direction as advective fluxes) as NO 3 --N and N0 2 --N are attenuated by denitrification near the surface sediment. This result suggests the reservoir works as an attenuation zone for nitrogen.

AB - This research aims to clarify the nutrient exchange processes within the reservoir of a suburban river by considering the interaction between subsurface water and river water. The vertical distributions of nutrient concentrations in the water column and sediment pore water indicate a large concentration gradient of dissolved nitrogen and phosphorus across the water-sediment interface. NO 3 --N dominates in the water column, whereas NH 4 +-N and P0 4 2--P dominate in the sediment pore water. The hydraulic gradient between the surface water and pore water in the sediment indicates that advection from the water column to the sediment occurs throughout the year, hence confirming surface water infiltration in this reservoir. Estimation of diffusive and advective nutrient flux showed that diffusive fluxes of NH 4 +-N and PO 4 2--P are larger than advective fluxes and that this reservoir acts as a source of these components for the river system. However, diffusive fluxes of NO 3 --N and N0 2 --N indicated a downward (water column to sediment) flux (i.e. same direction as advective fluxes) as NO 3 --N and N0 2 --N are attenuated by denitrification near the surface sediment. This result suggests the reservoir works as an attenuation zone for nitrogen.

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