Effects of Soil Hydraulic and Transport Parameter Uncertainty on Predictions of Solute Transport in Large Lysimeters

2013 ◽  
Vol 12 (1) ◽  
pp. vzj2012.0143 ◽  
Author(s):  
T.H. Skaggs ◽  
D.L. Suarez ◽  
S. Goldberg
Keyword(s):  
Solute Transport ◽  
Parameter Uncertainty ◽  
Transport Parameter ◽  
Soil Hydraulic

scholarly journals Measurement of Field Soil Hydraulic and Solute Transport Parameters

1998 ◽  
Vol 62 (5) ◽  
pp. 1172-1178 ◽  
Author(s):  
Francis X. M. Casey ◽  
Robert Horton ◽  
Sally D. Logsdon ◽  
Dan B. Jaynes
Keyword(s):  
Solute Transport ◽  
Field Soil ◽  
Transport Parameters ◽  
Soil Hydraulic

Parameter uncertainty in the mobile-immobile solute transport model

1997 ◽  
Vol 190 (1-2) ◽  
pp. 75-101 ◽  
Author(s):  
J. Vanderborght ◽  
D. Mallants ◽  
M. Vanclooster ◽  
J. Feyen
Keyword(s):  
Solute Transport ◽  
Parameter Uncertainty ◽  
Transport Model

scholarly journals Comparison between field measurements and numerical simulation of steady-state solute transport in a heterogeneous soil profile

1997 ◽  
Vol 1 (4) ◽  
pp. 853-871 ◽  
Author(s):  
J. Vanderborght ◽  
D. Jacques ◽  
D. Mallants ◽  
P.-H. Tseng ◽  
J. Feyen
Keyword(s):  
Solute Transport ◽  
Water Flow ◽  
Random Fields ◽  
Hydraulic Properties ◽  
Soil Hydraulic Properties ◽  
Field Scale ◽  
Flow Heterogeneity ◽  
Heterogeneous Soil ◽  
Soil Hydraulic ◽  
Second Procedure

Abstract. Abstract: Field-scale solute dispersion is determined by water flow heterogeneity which results from spatial variability of soil hydraulic properties and soil moisture state. Measured variabilities of soil hydraulic properties are highly sensitive to the experimental method. Field-scale dispersion derived from leaching experiments in a macroporous loam soil was compared with field-scale dispersion obtained with numerical simulations in heterogeneous random fields. Four types of random fields of hydraulic properties having statistical properties derived from four different types of laboratory measurements were considered. Based on this comparison, the measurement method depicting heterogeneities of hydraulic properties most relevant to field-scale solute transport was identified. For unsaturated flow, the variability of the hydraulic conductivity characteristic measured on a small soil volume was the most relevant parameter. For saturated flow, simulated dispersion underestimated the measured dispersion and it was concluded that heterogeneity of macroscopic hydraulic properties could not represent solute flow heterogeneity under these flow conditions. Field-scale averaged solute concentrations depend both on the detection method and the averaging procedure. Flux-averaged concentrations (relevant to practical applications) differ from volume-averaged or resident concentrations (easy to measure), especially when water flow is more heterogeneous. Simulated flux and resident concentrations were subsequently used to test two simple one-dimensional transport models in predicting flux concentrations when they are calibrated on resident concentrations. In the first procedure, solute transport in a heterogeneous soil is represented by a 1-D convection dispersion process. The second procedure was based on the relation between flux and resident concentrations for a stochastic convective process. Better predictions of flux concentrations were obtained using the second procedure, especially when water flow and solute transport are very heterogeneous.

Seawater intrusion dynamic at the Casetta farmland (Venice). Characterization using HYDRUS-1D

2020 ◽  
Author(s):  
Greta Finco ◽  
Ester Zancanaro ◽  
Pietro Teatini ◽  
Francesco Morari
Keyword(s):  
Electrical Conductivity ◽  
Solute Transport ◽  
Water Table ◽  
Water Uptake ◽  
Seawater Intrusion ◽  
Root Water Uptake ◽  
Variable Boundary ◽  
Soil Hydraulic ◽  
Hydrus 1D ◽  
Monitoring Stations

<p>Soil and groundwater salinization due to seawater intrusion is among the most important problems in coastal farmlands. Inverse estimation of unsaturated soil hydraulic and solute transport properties represents a fundamental step to understand saltwater intrusion dynamics. A three-year study was conducted in a maize field bounding the southern Venice Lagoon. Volumetric water content θ, soil matric potential ψ, and apparent electrical conductivity (ECa) were monitored hourly by five automatic monitoring stations at four depths (0.1, 0.3, 0.5 and 0.7 m). Groundwater electrical conductivity (EC) and depth to the water table were measured in five wells. In addition, soil water and groundwater samples were collected and analyzed to determine the chemical composition. Soil hydraulic parameters for the van Genuchten-Mualen equations were determined using the inverse method in Hydrus-1D. The water flow was modelled based on the daily averages of θ at the four depths and the θ values measured in the lab at selected ψ on undisturbed soil cores extracted from the five monitoring stations. Precipitation, crop transpiration, soil evaporation and depth to the water table were used as time-variable boundary conditions. Root water uptake was estimated by using Feddes model. Finally, the major ion chemistry module of HYDRUS-1D was used to model solute transport and root water uptake reduction due to osmotic stress. The use of HYDRUS-1D to understand saltwater dynamics would enable the developing of mitigation strategies to limit its detrimental effect on farmland productivity and groundwater quality.</p>

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