Description:
STONE, the national model to simulate nutrient losses, is used to predict effcets of changes in policy on the emission of nitrate and phopshorus to groundwater and surfacewater. In 2008 a protocol has been developed to validate STONE on data of data of the national mineral policy monitoring programme (LMM). This protocol has been used to validate the simulated manure applictaion and nitrate concentration in the groudnwater up to 2005. The forthcoming year (phase 2) the protocol will be improved and applied to validate concentrations in pipe drains en validate the simulated accumulation of P in the soil.
Research objectives:
The project aims for 2009 are:
- Improve the validation protocol by weighing the observations
- Apply the protocol for the validation of concentrations in drainwater, phosphorus concentrations and add data for 2006 and 2007 to the validation dataset
- Validate the accumulation of P by using the National sampling mappingunits (LSK) dataset
The projectgroup consists of STONE modellers, representatives of the LMM/BIN measurement network and (geo)statistic experts. The project consists of three seperate parts: improvement of the protocol, application of the protocol, validation on LSK). Results are discussed with a larger group of people involved in the modelling and the monitoring network and or policy advice.
Results and products:
The results of the project are:
- A method to weigh (scale) the model results en measurements to the level of indivual regions, farmtypes or the whole of the Netherlands
- Validation of STONE to both groundwater- and drainwater concentrations in LMM
- Validation of the P simulated P accumulation in STONE |
