Building risk indicators of surface water contamination by
pesticides at the small catchment scale. Taking into account
spatial and temporal dimensions. Support for risk assessment and
management : MIRIPHYQUE project. 2011-2013
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
BackgroundOnly few indicators exist at the catchment scale
(Devillers et al., 2005).
But there are still needs for :tools to assess catchments
potential to contaminate surface water, methods to base the choice
a priori between several mitigation solutions.
which take into account spatial distribution of pesticides uses
and existing or potential buffer zones.
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Project general aimTo design a method in order to assess the
potential of surface water contamination by pesticides at the small
catchment scale, taking into account :spatial and temporal
dimensions,man made structures influence on pesticides fluxes
(buffer zones, ditches, banks, roads),
HypothesisNumerical simulation models versus Indicators Hybrid
method, associating indicators and hydrological modelling at the
catchment scale
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
MethodologyNumerical modelling at the different relevant
scalesOrganization of simulated time-chart results in a
spatio-temporal warehouseModelling results aggregation ;
statistical analysis of results, comparison with observed data.
Implementation on two catchments with contrasted
agro-pedo-climatical characteristics: la Fontaine du Theil et la
Morcille Catchment typology (geology, pedology, climate,
agricultural practices) in order to prepare the adaptation of
developed tools from one catchment to another (similar) one.
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
MethodologyAggregating, at the catchment scale, results from
modelling at the field scale, for typical fields and typical
agro-pedo-climatical scenarii. In order to lead to water quality
indicators, CdF, and to compare them to observed data (chemical or
biological data) Virtual example of resulting indicators :
Concentrations exceedance durationsT = return periodx
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Global chartField scale modelling results (discharges and
concentration time charts, surface and subsurface)
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Methodology : Workpackage 1Physical modelling at the relevant
scales1.1 Defining pesticides uses scenarii1.2 Field scale
modelling1.3 Man made structures modelling1.4 Catchment scale
modellingFontaine du Theil : Assessment of hydrodynamical
characteristics of soil layers .
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Workpackage 1La Morcille siteHydrodynamical characteristics
(K-Psi-Theta) Bimodal porosity.
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Workpackage 1Fontaine du Theil. Simulation at the field scale
with MACRO (Jarvis et al, 1994)
Brown non hydromorphic soil.
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Methodology : Workpackage 2Organization of simulated time-charts
in a spatio-temporal warehouse2.1 Developing a conceptual model to
represent data 2.2 Designing a data warehouse for numerical
modelling results
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Workpackage 2Alternative solution : SACADEAU (tree of fields
outlets)643 outlets simplificationOutlet treesField deconnection by
hedges
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Methodology : workpackage 3Aggregation at the catchment scale3.1
Design of the catchment scale aggregation method3.2 Validation of
SACADEAU tool on La fontaine du Theil3.3 Sensitivity analysis at
the different modelling scales ; reflection about implementation on
other catchments3.4 Comparison with existing data
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Workpackage 3Field 3 : type brown soil, slope 3%Soil occupation
: cornPost emergence use of pesticidesField 5 : type hydromorphic
soil, slope 1%Soil occupation : winter wheatPre emergence use of
pesticidesVegetative filter strip.Efficiency varying with
timeC(outlet, t) = (f(field, buffer zone, t))surfacesubsurfaceData
warehouse Simulation results ; year 2000
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
ConclusionFirst year of the project. Next step : finalization of
simulation results warehouse ; aggregation.
Project which will lead to a method having both advantages of
numerical simulations AND indicators
*Innovative approaches for the management of environmental risks
from plant protection products . 26-28 october 2011
Thank you for your attentionThanks for funding to :
INRA: Franch National Institute for Agricultural ResearchARVALIS
: vegetal instituteUIPP: plant protection industry unionCemagref :
environmental science and technologie research institute entit de
base pour lestimation de limpact sur la qualit des eaux de
surface).(rappeler loral les diffrents niveaux dactions : rduction
dusages, transferts, toxicit ?)
