How efficient are one-dimensional models to reproduce the hydrodynamic behavior of structured soils subjected to multi-step outflow experiments?

摘要: Summary In this paper we investigate numerically the three following questions: (1) Do MSO data show impact of soil structure on water flow? (2) If so, to what extent are common one-dimensional hydraulic models able apprehend any preferential flow features? and (3) What predictive capabilities these parameterized with data? A Bayesian framework was used infer under virtual conditions, for samples different levels heterogeneity. This, by coupling HYDRUS-1D model DiffeRential Evolution Adaptive Metropolis algorithm (DREAM). Regarding questions 1 2, our findings indicate that (i) large outflow observed during first steps may express behavior a real macropore, or structural heterogeneity inside core; (ii) cannot be characterized MV ( Mualem, 1976 , van Genuchten, 1980 ) DR Durner, 1994 whereas mobile–immobile Philip, 1968 Genuchten Wierenga, dual-permeability Gerke 1993a 1993b can provide excellent fits depending architecture type; (iii) in presence macropores, DUAL performed excellently despite frequent convergence problems code. Furthermore, neglecting result perfect match matrix model. question 3, infiltration front experiment reveals MIM not satisfactorily. This indicates underlying concept induce wrong reasons. Similar hold architectures other than macroporous. For macroporous soil, i.e., conceptual which designed, latter consistent results conditions. however, should verified soils. Lastly, calibrate induce, significant errors when predicting infiltration. because macropore-matrix transfer.