| The page contains downloads of published articles, papers, etc on the topic of water. |
Overview of Catchment Scale Nutrient Modelling in New Zealand: Outcomes from workshop: Wellington, July 2009
Catchment scale nutrient models are increasingly being used by regional councils and unitary authorities to investigate the impacts of intensive land use on the environment to develop policy to manage these effects.
The objectives of the workshop held in Wellington in July 2009 were to raise potential end user understanding of these models, share some lessons learnt and promote cross discipline discussion. Emphasis was also on improving collaboration between councils and research providers, and to identify actions to improve the understanding and uptake of these models.
This report provides an overview of catchment modelling concepts, outlines points to consider when establishing a modelling project, selecting models and using results. It also contains summary information on the range of models currently used in New Zealand. The report also captures feedback and recommendations from the workshop.
 Download (4,150.5 kb)
|
FRST Land Use Change & Intensification II (LUCI II) programme – Plant & Food Research & AgResearch.
The goals of this eight year Plant and Food and AgResearch programme are to provide ”the integrated knowledge and tools required by land users and policy makers to assess and better manage impacts associated with land use change and intensification on agricultural productivity and the environment”.
Download (64.7 kb)
|
Attenuation of Nitrate in the Subsurface Environment of a lowland dairying catchment
The ongoing expansion and intensification of dairy farming has the potential to further increase the contamination of ground and surface waters with nutrients. Land use impacts on surface water quality in the Toenepi dairying catchment have been investigated since 1997 (Wilcock et al., 2006). To improve the understanding of processes occurring during the transport of nitrogen from the land surface to the stream, in 2002 we initiated additional research on the nitrogen dynamics in the vadose zone - aquifer continuum (Stenger et al., 2008).
Download (67.8 kb)
|
Nitrate Leaching Losses from Cropping Rotations
The effects of land use change and intensification on groundwater contamination by leached nitrate (NO3) are of particular concern in New Zealand. Both farmers and policy makers need tools to be able to predict the effects of land management decisions on groundwater quality. While there are modelling tools available for predicting leaching from single crops in New Zealand conditions (Li et al. 2007), there are few models that can predict losses from cropping rotations. Furthermore, there are few New Zealand data available to validate predicted NO3 leaching losses. Most NO3 leaching losses from crops have been measured over the winter period. However, the increasing use of irrigation and large fertiliser inputs for growing high value crops increases the likelihood of leaching losses during other seasons. We designed a three year field experiment to quantify how NO3 leaching losses were affected by different nitrogen and irrigation management for two cropping rotations. Results from this experiment have been used to validate components of a new cropping sequence simulation model.
Download (20.8 kb)
|
Redox Zonation Affecting Groundwater Nitrate Concentrations In The Tutaeuaua Catchment, Lake Taupo (2008)
Should denitrification occur below the root zone of the pasture, the nitrate load entering Lake Taupo would be smaller than calculated from leaching estimates valid for the bottom of the root zone. However, due to the commonly presumed scarcity of organic matter in the young volcanic materials and their high porosity, the extent of denitrification has previously been considered negligible.
Download (72.9 kb)
|
IRAP: Integrated Research for Aquifer Protection - Soils Conference Presentation (2008)
The Integrated Research for Aquifer Protection (IRAP) programme aims to produce software tools that can predict likely impacts of land use change on the quality of groundwater underlying the relatively flat alluvial plains of New Zealand. It brings together the expertise of eight organisations, and covers plot-scale experimental work on the root and vadose zones, as well as development of computerised simulation models. This presentation focuses on the development and description of the software tools.
Download (23.5 kb)
|
Groundwater nitrate attenuation in a volcanic environment (Lake Taupo, New Zealand) (2009)
Pastoral farming is considered responsible for early signs of deterioration of the water quality of Lake Taupo. The potential for nitrate attenuation to occur below the bottom of
the root zone was considered negligible when ‘Nitrogen Discharge Allowances’ were set for all farms in the catchment. However, we found reduced and virtually nitrate-free groundwater...
Download (54.2 kb)
|
Nutrient loss estimation in pastoral farms – a review of nutrient management models of relevance to New Zealand agriculture (2009)
Reliable estimation of nutrient losses from farmland is of increasing interest, driven by both economic and environmental concerns. Routine direct measurement of nutrient losses is currently impractical given the scale and variability of the problem. Simulation models are the best alternative and their use for assessing potential nutrient losses has been increasing worldwide. In New Zealand...
To review this paper please go to
http://www.royalsociety.org.nz/Site/publish/Journals/nzjar/default.aspx
|
The role of three different models for estimating nutrient loss from pastoral farms (2008)
Increasing nutrient loss from farms is of concern in many regions of New Zealand. Methods and tools for the assessment and monitoring of these losses are in demand. Modelling of the farm system is currently the only practicable method for assessing these losses routinely and at an appropriate scale. However there is not a general acceptance of models for such purposes, partially due to misconceptions about how the models work and confusion about the apparent overlap between the models available.
Download (2,624.7 kb)
|
Steady-state groundwater models of the area between the Rakaia and Waimakariri Rivers (2009)
The purpose of this work was to develop a groundwater flow model of the Central Plains area to support an initial assessment of nitrate discharge to groundwater from agricultural land use, using the AquiferSim model. The groundwater flow model was developed to represent recharge (from rivers and rainfall) and discharge (to groundwater-dependent streams and the ocean) sufficient to meet the input requirements of the AquiferSim model.
Download (5,774.5 kb)
|
Estimating nutrient loss to waterways—an overview of models of relevance to New Zealand pastoral farms (2009)
Reliable estimation of nutrient losses from farmland is of increasing interest, driven by both economic and environmental concerns. Routine direct measurement of nutrient losses is currently impractical given the scale and variability of the problem. Simulation models are the best alternative and their use for assessing potential nutrient losses has been increasing worldwide. In New Zealand...
Download (1,043.9 kb)
|
Assessing Nitrogen Leaching from Cropping Systems using a Nutrient Budget Model (2009)
Concerns about the environmental impact of agricultural land use intensification mean that farmers are increasingly required to demonstrate that their soil nutrient management does not have an adverse effect on the environment. In New Zealand...
Download (850.2 kb)
|
Movement of Nitrate & Bromide...
Paper presented by Murray Close - ESR - at the 2007 HydroSoc conference.
"Movement of Nitrate & Bromide through a coarse gravel vadose zone under cropping & dairying land uses."
Download (4,258.0 kb)
|
Development of the AquiferSim Model of Cumulative....
Development of the AquiferSim Model of Cumulative Effect on Groundwater of Nitrate Discharge from Heterogeneous Land Use over Large Regions. Paper presented by Vince Bidwell and John Good at the 2007 MODSIM Conference
Download (379.9 kb)
|
Proceedings of IRAP Joint EAG/Science Group Workshop - Lincoln 18 April 2007
This technical report covers those present, the meeting agenda, meeting discussion notes and copies of the presentations.
The authors are: Murray Close (ESR), Glyn Francis (Crop and Food Research), Linda Lilburne (Landcare Research), John Bright (Aqualinc), Pete Jamieson (Crop and Food Research) and Vince Bidwell (Lincoln Ventures Ltd).
Download (2,217.7 kb)
|
Predictive farm and regional scale tools for assessing land use impacts on groundwater quality 22 Mar 07
Nitrate in groundwater is a major contaminant internationally. In New Zealand, regulatory authorities (regional councils) vested with responsibility to maintain environmental quality, have found increasing nitrate levels in groundwater and surface water, some which exceed the acceptable drinking standard...
Download (1,826.5 kb)
|
Simulating within-paddock variability of nitrate leached from a mixed cropping paddock - 22 Mar 07
Download (867.6 kb)
|
Strategy for Developing GIS-based Tools for Management of the Effects on Groundwater of Nitrate Leaching from Agricultural Land Use
Bidwell, V.J., L.R. Lilburne & J.M. Good. (2005). In Zerger, A. and Argent, R.M. (eds) MODSIM 2005 International Congress on Modelling and Simulation.
Modelling and Simulation Society of Australia and New Zealand, December 2005, pp. 1354-1360. ISBN: 0-9758400-2-9.
Download (945.8 kb)
|
The Benefits and Practicalities of Using Extensible Markup Language (XML) for the Interfacing and Control of Object-Oriented Simulations.
Good, J. (2005). In Zerger, A. and Argent, R.M. (eds) MODSIM 2005 International Congress on Modelling and Simulation.
Modelling and Simulation Society of Australia and New Zealand, December 2005, pp. 655-661. ISBN: 0-9758400-2-9.
Download (419.7 kb)
|
An Object-Oriented Software Framework for the Farm-Scale Simulation of Nitrate Leaching from Agricultural Land Uses - IRAP FarmSim
Good, J. & J. Bright (2005). In Zerger, A. and Argent, R.M. (eds) MODSIM 2005 International Congress on Modelling and Simulation.
Modelling and Simulation Society of Australia and New Zealand, December 2005, pp. 662-668. ISBN: 0-9758400-2-9.
Download (468.4 kb)
|
Groundwater recharge interface and nitrate discharge: Central Canterbury, New Zealand.
Bidwell, VJ (2005): In Acworth, RI; Macky, G and NP Merrick (eds.) Proceedings of the NZHS-IAH-NZSSS 2005 Conference
ÒWhere Waters MeetÓ, Auckland, 28 November - 2 December 2005, Paper I17. ISBN 0 473 10627 2.
Download (545.5 kb)
|