Roland Stenger

Roland Stenger

Principal Scientist, Environmental

Dr.agr., Dipl.Ing.agr., TUM, Germany

Office +64 7 858 4840

Direct +64 7 858 4844

Email roland.stenger@lincolnagritech.co.nz

Back

Roland specialises in researching the movement of water, and transport and transformation of nitrogen, between a parcel of land and the receiving surface water. As defensible cause-effect relationships between land use and water pollution require both, the hydrological pathways and the contaminant transformations occurring along them to be understood, it has been a feature of his work to advance hydrological and biogeochemical research concurrently.

Roland has 20 years of experience working with New Zealand regional councils and primary industry organisations, both through collaboration in government-funded research programmes and through consulting projects.

Roland led the “Transfer Pathways Programme” funded by the Ministry of Business Innovation and Employment from 2015-2018 and now leads its successor programme. This new “Critical Pathways Programme” focuses particularly on unravelling the typically shallow and relatively fast pathways between a parcel of land and a local stream or small river. Roland also contributes to the “Enhanced Mitigation of Nitrate in Groundwater” programme led by Environmental Science and Research (ESR), the “Doubling Diffuse Pollution Mitigation” programme led by the National Institute for Water and Atmospheric Research (NIWA), and the “Sources and Flows” programme of the Our Land and Water National Science Challenge.

He has published over 30 journal articles, contributed to a number of book publications, and is a reviewer for several academic journals including Hydrological Processes; Biogeosciences; Geoderma; Journal of Environmental Quality; European Journal of Soil Science; Agriculture, Ecosystems and Environment.

Roland is an active member of the New Zealand Hydrological Society and the New Zealand Society of Soil Science and sits on the Scientific Advisory Committee of the “Land Use and Water Quality” conference series – assisting in organising the biennial conferences in Austria (2015), Netherlands (2017) and Denmark (2019).

Roland’s research areas include:

  • Quantification of pathway-specific transfers of nitrogen and phosphorus from land to surface waters that take lag times and attenuation into account.
  • Biogeochemical and hydrological controls on denitrification in the vadose zone-groundwater zone continuum.
  • Redox-stratification of groundwater systems.
  • Harnessing built and natural nitrogen attenuation capacity to optimise land use patterns.

Recent Projects

Latest Publications View All

Achieving unbiased predictions of national-scale groundwater redox conditions via data oversampling and statistical learning. Science of the Total Environment, Vol. 705, 135877 14pp.

Wilson, S. R., Close, M. E., Abraham, P., Sarris, T. S. Banasiak, L., Stenger, R., Hadfield, J. Mar, 2020

The influence of unsaturated zone drainage status on denitrification and the redox succession in shallow groundwater. Science of the Total Environment, Vol. 660, 1232-1244.

Clague, J.C., Stenger, R., Morgenstern, U. Nov, 2019

Likely controls on dissolved reactive phosphorus concentrations in baseflow of an agricultural stream Journal of Soils and Sediments

McDowell, R.W., Depree, C., Stenger, R. Feb, 2020

Nitrate removal and secondary effects of a woodchip bioreactor for the treatment of subsurface drainage with dynamic flows under pastoral agriculture. Ecological Engineering 148 (2020) 105786. doi.org/10.1016/j.ecoleng.2020.105786

Rivas, A., Barkle, G., Stenger, R., Moorhead, B. Clague, J. Jan, 2020

Achieving unbiased predictions of national-scale groundwater redox conditions via data oversampling and statistical learning

Wilson, S.R., Close, M.E., Abraham, P., Sarris, T.s., Banasiak, L., Stenger, R., Hadfield, J. Nov, 2019

The influence of unsaturated zone drainage status on denitrification and the redox succession in shallow groundwater

Clague, J.C., Stenger, R., Morgenstern, U. Jan, 2019

Effect of varying flowpath contributions on longitudinal baseflow stream chemistry patterns

Clague, J., Stenger, R., Morgenstern, U. Dec, 2018

Reducing nitrate discharges from artificial drainage with woodchip bioreactors

Rivas, A., Barkle, G., Moorhead, B., Clague, J., Stenger, R. Dec, 2018

Can we defensibly estimate catchment-scale flowpath contributions based on widely available geospatial data?

Rivas, A., Stenger, R. Dec, 2018

Estimating catchment-scale flowpath contributions based on widely available geospatial data

Rivas, A., Stenger, R. Dec, 2018

Determining the vertical variation of hydraulic properties in the shallow groundwater zone

Rivas, A., Barkle, G., Moorhead, B., Stenger, R. Dec, 2018

Predicting nitrate discharge dynamics in mesoscale catchments using the lumped StreamGEM model and Bayesian parameter inference

Woodward, S. J. R., Wöhling, T., Rode, M., Stenger, R. Sep, 2017

Indirect Methods to Elucidate Water Flows and Contaminant Transfer Pathways through Meso-scale Catchments – a Review

Singh, S.K., Stenger, R. Oct, 2018

Bayesian chemistry-assisted hydrograph separation (BACH) and nutrient load partitioning from monthly stream phosphorus and nitrogen concentrations

Woodward, S. J. R., Stenger, R. Sep, 2018

The influence of a flood event on the potential sediment control of baseflow phosphorus concentrations in an intensive agricultural catchment

McDowell, R. W., Simpson, Z. P., Stenger, R., Depree, C. Jun, 2018

Vertical stratification of redox conditions, denitrification and recharge in shallow groundwater on a volcanic hillslope containing relict organic matter

Stenger, R., Clague, J. C., Morgenstern, U., Clough, T. J. May, 2018

Understanding the linkage between hydrological and chemical signatures at catchment outlets and dominant contaminant transfer pathways

Stenger, R. Nov, 2017

Nitrate assimilation capacity of shallow groundwater underlying dairy farms in the Reporoa Basin, NZ

Stenger, R., Clague, J., Moorhead, B., McKelvey, T., Morgenstern, U. Jun, 2017

Using flow regimes to determine how well catchments buffer water quality contaminants

McDowell, R. W., Snelder, T., Stenger, R., Rissmann, C., Larned, S. Jun, 2017

Agriculture and water quality, developments and challenges in science, management and policy 2013-2017: Examples from a few countries

Fraters, D., Kovar, K., Kronvang, B., Stenger, R., Bolster C. Jun, 2017

Using monthly stream water quality data to quantify nitrate transfer pathways in three Waikato catchments.

Woodward, S. J. R., Stenger, R. ,

A framework for understanding the linkages between land and water quality impacts.

Tanner, C. C., Muirhead, R., Burger, D., Carrick, S., Close, M., Monaghan, R., Singh, S., Srinivasan, M., Stenger, R., Tipa, G. ,

Nitrogen phosphorus exports from artificially drained dairy pastures in the Hauraki Plains, NZ

Stenger, R., Barkle, G., Moorhead, B., McKelvey, T. May, 2017

Genome-scale investigation of phenotypically distinct but nearly clonal Trichoderma strains

Lange, C., Weld, R. J., Cox, M. P., Bradshaw, R. E., McLean, K. L., Stewart, A., Steyaert, J. M. Mar, 2016

Flow Stratification of River Water Quality Data to Elucidate Nutrient Transfer Pathways in Mesoscale Catchments

Woodward, S. J. R., Stenger, R., Hill, R. B. Mar, 2016

Uncertainty in the modelling of spatial and temporal patterns of shallow groundwater flow paths: the role of geological and hydrological site information

Woodward, S. J. R., Wöhling, T., Stenger, R. Mar, 2016

Denitrification in the shallow groundwater system of a lowland catchment: A laboratory study

Clague J. C., Stenger, R., Clough, T. J. Aug, 2015

Evaluation of the stable isotope signatures of nitrate to detect denitrification in a shallow groundwater system in New Zealand

Clague J .C., Stenger, R., Clough T. J. Apr, 2015

Flow Stratification of River Water Quality Data to Elucidate Nutrient Transfer Pathways in Mesoscale Catchments

Woodward, S. J. R., Stenger, R., Hill, R. B. Jan, 2015

Uncertainty in the modelling of spatial and temporal patterns of shallow groundwater flow paths: The role of geological and hydrological site information

Woodward, S. J. R., Wöhling, T., Stenger, R. Mar, 2016

Quantifying groundwater contribution to stream flow generation in a steep headwater catchment

Barkle, G. F., Stenger, R., Burgess, C., Wall, A. Jan, 2014

Variability of unsaturated Bromide fluxes as measured through a layered volcanic vadose zone in New Zealand

Barkle, G. F., Wöhling, T., Stenger, R. Jan, 2014