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On the Value of Local Measurements for Prediction of Pesticide Transport at the Field Scale

^a Environmental Science/Lancaster Environment Centre, Lancaster Univ., Lancaster LA1 4YQ, UK
^b Key Lab. of Water Resources Development, Hohai Univ., Nanjing, 210098, China
^c Institute of Environmental Science and Technology, Swiss Federal Institute of Technology, ISTE/HYDRAM, ENAC, EPFL, 1015 Lausanne, Switzerland

View larger version (13K): [in a new window]   Fig. 1. An illustration of the field-scale parameter distribution, with changing mean but fixed standard deviation, moving across the feasible parameter range [x0, xn].

View larger version (14K): [in a new window]   Fig. 2. The (a) 50%, (b) 90%, and (c) 99% quantiles of atrazine concentration predictions.

View larger version (15K): [in a new window]   Fig. 3. Feasible ranges for Kd (0.1–3.1 cm3 g–1) and for field-scale Kd distributions (0.55–1.8 cm3 g–1) with a CV of 0.4 and distributions of the Kd values of the behavioral parameter sets obtained from Column Experiments A, B, C, and D (the field-scale normal distributions with means of 0.55 and 1.8 and CV of 0.4 are also shown). The bar shows the prior range of the feasible field-scale means under the assumptions of the analysis before conditioning on the column data. Kd = distribution coefficient.

View larger version (28K): [in a new window]   Fig. 4. The (a) 50% and (b) 90% quantiles of atrazine concentration predictions at the lower boundary of the profile (1.5-m depth) with field-scale parameter distribution conditioned individually by behavioral parameter sets of Columns A, B, C, and D.

View larger version (28K): [in a new window]   Fig. 5. The (a) 50% and (b) 90% quantiles of atrazine concentration predictions at the lower boundary of the profile (1.5-m depth) with field-scale parameter distribution conditioned consecutively by behavioral parameter sets of Columns A, B, C, and D.

View larger version (13K): [in a new window]   Fig. 6. The 99% quantiles of atrazine concentration predictions at the lower boundary of the profile (1.5-m depth) with field-scale parameter distribution (a) unconditioned, (b) conditioned with data of Column A, and (c) conditioned with data of Columns A, B, C, and D. Note changes in concentration scale.