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Aldrin Rivas

Catchment Hydrologist

Aldrin Rivas

BSc, MEng, PhD

Aldrin joined Lincoln Agritech in 2016 as a Catchment Hydrologist. He previously had 10 years of professional experience in water and environmental science, engineering, and management. He has worked in various sectors including academia and consultancy for private and government entities.

Aldrin has a PhD from Massey University with a thesis on denitrification in the subsurface environment of the Manawatu River catchment. He received his bachelor’s degree in Civil Engineering in the Philippines and his master’s degree in Water Engineering and Management from Thailand. He has also received training on environmental modelling, including modelling of water and solute transport in the unsaturated zone.

The focus of Aldrin’s current research is on denitrification in natural and engineered systems, but he has a wide range of interests including:

  • denitrification in the vadose and saturated zones
  • denitrifying woodchip bioreactors
  • transfer pathways in the surface and subsurface environments
  • vulnerability assessment of freshwater resources
  • integrated catchment development and management
  • water supply systems and management
  • environmental and hydrological modelling.

You can find Aldrin’s research outputs in his Google Scholar or ResearchGate page.


Improving accuracy of quantifying nitrate removal performance and enhancing understanding of processes in woodchip bioreactors using high-frequency data, “Science of The Total Environment”
Rivas A, Barkle G, Sarris T, Park J, Kenny A, Maxwell B, Stenger R, Moorhead B, Schipper L, Clague J
Flow analysis and hydraulic performance of denitrifying bioreactors under different carbon dosing treatments, “Journal of Environmental Management”
Moghaddam R, Barkle G, Rivas A, Schipper L
Constant carbon dosing of a pilot-scale denitrifying bioreactor to improve nitrate removal from agricultural drainage, “Ecological Engineering”
Moghaddam F, Barkle G, Rivas A, Torres-Rojas D, Schipper L
Enhanced Nitrate Removal with Methanol Dosing in Woodchip Bioreactors: Laboratory and Field evidence, 36th Annual FLRC Workshop
Moghaddam, R, Barkle, G, Rivas, A, Torres-Rojas, D, Schipper, L
Biogeochemical pathways for phosphorus removal in woodchip bioreactors, 35th Annual FLRC Workshop
Perrera, G, Torres-Rojas, D, Rivas, A, Barkle, G, Moorhead, B, Schipper, L, Craggs, R, Hartland, A
Methanol Dosing Increases Nitrate Removal in Woodchip Bioreactors with No Substantial Adverse Effects: laboratory and field evidence, 35th Annual FLRC Workshop
Moghaddam, R, Barkle, G, Rivas, A, Torres-Rojas, D, Schipper, L
Simultaneous phosphorus removal and redox buffering of denitrifying bioreactors using organo-mineral composites, 35th Annual FLRC Workshop
Torres-Rojas, D, Rivas, A, Barkle, G, Hartland, A
High-frequency spatiotemporal data improves estimates of nitrate removal performance and understanding of processes in woodchip bioreactors, Adaptive Strategies for Future Farming
Rivas A, Barkle G, Park J, Moorhead B, Maxwell B, Stenger R, Schipper L, Clague J
Carbon dosing enhances nitrate removal effectiveness in denitrifying bioreactors: A field trial in New Zealand, “Adaptive Strategies for Future Farming”
Moghaddam R, Barkle G, Rivas A, Torres-Rojas D, Schipper L
Combining surface water monitoring, age-dating, and parsimonious modelling to unravel water and contaminant pathways through catchments, Adaptive Strategies for Future Farming
Stenger R, Park J, Morgenstern U, Hadfield J, Rivas A, Clague J
Woodchip bioreactors – design considerations, New Zealand Land Treatment Collective Annual Conference: Improving outcomes for land treatmen
Barkle, G., Rivas, A., Moorhead, B., Stenger, R., Schipper, L., & Clague, J.
Methanol dosing of a pilot-scale denitrifying bioreactor to enhance nitrate removal from tile drainage water, New Zealand Land Treatment Collective Annual Conference: Improving outcomes for land treatment
Moghaddam, R., Torres-Rojas, D., Barkle, G., Rivas, A., Hartland, A., & Schipper, L.
A novel method for calculating nitrate removal rates in woodchip bioreactors using data from high-frequency monitoring. Weathering the Storm Conference Handbook, Oral abstracts.
Rivas, A., Barkle, G., Maxwell, B., Moorhead, B., Stenger, R., Park, J., Schipper, L., and Clague, J
Synoptic flow gaugings/stream sampling to unravel heterogeneity within catchments NZHS, NZ Rivers Group and NZFSS Joint Conference
Stenger. R, Rivas.A, Brakle.G, Clague.J, Moorhead.B, Park.J, Morgenstern.U
Synoptic gaugings/samplings to elucidate water and nutrient fluxes within catchments, NZ-China Water Research Centre workshop
Stenger, R, Rivas, A, Barkle, G, Owers, J, Clague, J, Moorhead, B, Park, J, Morgenstern, U.
High-frequency, in situ sampling of field woodchip bioreactors reveals sources of sampling error and hydraulic inefficiencies, “Journal of Environmental Management”
Maxwell, B. M., Birgand, F., Schipper, L.A., Barkle, G., Rivas, A., Helmers, M.J., Christianson, L.E
Nitrate removal and secondary effects of a woodchip bioreactor for the treatment of subsurface drainage with dynamic flows under pastoral agriculture, “Ecological Engineering”
Rivas, A., Barkle, G., Stenger, R., Moorhead, B. Clague, J
Determining spatial variability of nitrate removal in a woodchip bioreactor through high frequency monitoring at multiple locations, FLRC 2020
Aldrin Rivas, Greg Barkle, Bryan Maxwell, Brian Moorhead, Roland Stenger, Louis Schipper, François Birgand, Juliet Clague
Pilot-scale woodchip bioreactor for removing nitrate from artificial drainage in a Waikato dairy farm, A Workshop on Innovations for Attenuating Nutrient Loss from Farms
A. Rivas, G. Barkle, B. Moorhead, J. Clague, & R. Stenger