New insight into pesticide partition coefficient K d for modelling pesticide fluvial transport with the SWAT model
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1 New insight into pesticide partition coefficient K d for modelling pesticide fluvial transport with the SWAT model Laurie BOITHIAS, Sabine SAUVAGE, Raghavan SRINIVASAN, Jeff ARNOLD, José-Miguel SANCHEZ-PEREZ 2013 Int. SWAT Int. Conference SWAT - Conference, Laurie Boithias Toulouse, France 1
2 Pesticides and floods -Surface water pesticide contamination is an issue for ecosystems and human consumption ( µg L -1 for drinking water) -Floods play a major role in pesticides transfers : e.g. 61% metolachlor / 17% time (Boithias et al., 2011) -Managers need reliable predictive tool 2
3 Metolachlor (µg L -1 ) Rainfall (mm) Pesticide partition modelling in SWAT 2010 spring flood Observed (dissolved) Observed (sorbed) Simulated (dissolved) Simulated (particulate) EU limit 0.1 µg L -1 Case of metolachlor: pre-emergence herbicides S w = 480 mg L -1 ; log K ow = kg ha -1 The inversion of the partition is not simulated. Can we improve it? Boithias et al., J. Hazard. Mater., 2011, Boithias et al., Region. Environ. Change, In revision 3 Time (days)
4 The Save catchment Neste canal: 1 m 3 s -1 (irrigation) Save River: 6 m 3 s -1 Larra gauging station Meteorological stations Catchment area : 1117 km² 60% of calcic soil with up to 50% clay Rainfall : mm ET : mm Auch Toulouse Agriculture = 90% 4 4
5 Water quality monitoring Hourly discharge Particulate Organic Carbon (POC) Total suspended matter (TSM) Pesticides (dissolved and sorbed) Sampler Height (cm) Automatic Manual Δx = cm Sonde Seuil Sampling period = f(water height) Aguaflash : 242 samples Laboratory analysis: 46 sought molecules Time (days) 5
6 Relationship between Koc and Kow 16 hydrological events : 11 high flow periods + 5 low flow periods 6
7 K d m 3 g 1 C C sorbed soluble Observed pesticide dynamics R 2 = 0.86 (p<0.05) R 2 = 0.97 (p<0.05) 7
8 Pesticide fate modelling with SWAT Biological and chemical processes Physical processes d: dissolved p: particulate Root zone Vadose zone APPLICATION AIR / PLANTS Volatilization Degradation Leaching SOIL Degradation Infiltration (d) K p Phase distribution in soil Csorbed K p SK oc C solution TRANSFERS Surface runoff (d,p) Sub-surface runoff (d) RIVER Degradation Volatilization (d) Settling (p) orgc 100 Saturated zone Deep aquifer F d Phase distribution in rivers 1 1 CK conc oc sed F 1 p F d SEDIMENTS BED Degradation Resuspension (d,p) Diffusion (d) Burying (p) 8
9 K d sensitivity in SWAT Sentivity analysis : S i P I I P(I) SWAT calibration from Boithias et al., In revision, Region. Environ. Change S i mean Metolachlor Aclonifen SK oc Soil -0,44-0,30 CK oc River -1,17-0,95 3x more sensitive To improve the partition at basin scale -> we focus on Ckoc From Karickhoff et al. (1979) : K d f oc K oc K d f ( TSM) f ( K ) ow SWAT simulates TSM K d is better correlated to TSM than POC K ow is a standard laboratory value 9
10 f OC (%) Relationship between %POC and TSM Data: (Aguaflash + Oeurng et al., 2011, Hydrol. Process.) %OC in top soil horizons Min. TSM at gauging station TSM (mg L -1 ) f oc 0.09 TSM Validity domain: TSM = ]5;1000] When over 1000 mg L -1 f oc = 1.6% R² =
11 Relationship between Koc and Kow K oc K ow K oc Kow R² =
12 TSM (mg L -1 ) Conclusions Kd 2 Kd 3 Kd 1 Kd 4 K TSM d K ow (m 3.g -1 ) Method may be applied to a wide range of catchment and organic contaminants Equation can be implemented in any model describing the fate of pesticides in both dissolved and sorbed phases Currently under revision in Chemosphere 12
13 Thanks for your attention! For further questions : l.boithias@gmail.com Present address at ICRA, Spain 13
14 How to aggragte concentrations For each low flow and high flow concentration : C C 1 Q 1 Q 1 C Q 2 2 Q
15 Environmental parameters 15
16 16
17 Regressions TSM POC DOC R 2 n R 2 n R 2 n Average Q 0.40 (p<0.05) (p<0.05) Maximal Q 0.86 (p<0.05) (p<0.05) (p<0.05) 14 ph POC 0.97 (p<0.05) DOC 0.39 (p<0.05) (p<0.05) 14 - K d alachlor K d atrazine K d DEA K d isoproturon K d metolachlor 0.47 (p<0.05) (p<0.05) K d tebuconazole K d trifluralin
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