Influence of Initial and Boundary Conditions on Solute Transport through Undisturbed Soil Columns

2004 ◽  
Vol 68 (2) ◽  
pp. 404 ◽  
Author(s):  
C. J. Hamlen ◽  
R. G. Kachanoski
Keyword(s):  
Boundary Conditions ◽  
Solute Transport ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Initial And Boundary Conditions

Estimating solute transport in undisturbed soil columns using time-domain reflectometry

1994 ◽  
Vol 17 (2) ◽  
pp. 91-109 ◽  
Author(s):  
D. Mallants ◽  
M. Vanclooster ◽  
M. Meddahi ◽  
J. Feyen
Keyword(s):  
Solute Transport ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Soil Columns ◽  
Undisturbed Soil

scholarly journals Field-scale solute transport parameters derived from tracer tests in large undisturbed soil columns

Soil Research ◽  
2014 ◽  
Vol 52 (1) ◽  
pp. 13 ◽  
Author(s):  
Dirk Mallants
Keyword(s):  
Solute Transport ◽  
Transport Model ◽  
Linear Regression Analysis ◽  
Local Scale ◽  
Time Domain Reflectometry ◽  
Hydrodynamic Dispersion ◽  
Transport Parameters ◽  
Field Scale ◽  
Soil Columns ◽  
Undisturbed Soil

Transport parameters obtained from laboratory tracer experiments were used to evaluate the stochastic form of the equilibrium convection–dispersion equation (CDE) in describing the transition of scale, i.e. from the column or local scale to a larger field scale. Local-scale solute breakthrough curves (BTCs) were measured in 1-m-long and 0.3-m-diameter undisturbed soil columns by means of time-domain reflectometry at six depths for a 79-h input pulse of chloride. The local-scale data were analysed in terms of the equilibrium CDE and the mobile–immobile non-equilibrium transport model (MIM). At the local scale, the MIM transport model better described the observed early breakthrough and the tailing of the BTC than did the CDE. A linear regression analysis indicated that the relationship between the hydrodynamic dispersion D and pore-water velocity v was of the form D = 31vl.92 (correlation ρv,D = 0.74). Averaging of the local-scale BTCs across the field produced a large-scale or field-scale mean BTC; at the greatest observation depth (0.8 m) the field-scale dispersivity <D>/<v> = λ equals 0.656 m. The results further showed that for large values of the mean dispersion coefficient, <D>, local-scale dispersion is an important mechanism for field-scale solute spreading, whereas the standard deviation, σD, and the correlation between v and D, ρvD, have negligible effects on field-scale transport. Stochastic stream tube models supplemented with statistical properties of local-scale transport parameters provide a practical and computationally efficient tool to describe heterogeneous solute transport at large spatial scales.

AN IMPROVED METHOD TO STUDY SOLUTE LEACHING IN LARGE UNDISTURBED SOIL COLUMNS NEAR FIELD CAPACITY TOWARD THE GROUNDWATER IN VARIOUS ENVIRONMENTS

2020 ◽  
Vol 15 (1) ◽  
pp. 93-102
Author(s):  
Cristian PĂLTINEANU ◽  
◽  
Andrei VRINCEANU ◽  
Anca-Rovena LĂCĂTUȘU ◽  
Radu LĂCĂTUŞU ◽  
...  
Keyword(s):  
Near Field ◽  
Field Capacity ◽  
Improved Method ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Solute Leaching

DETERMINISTIC APPROACH TO WATERSHED MODELING

1971 ◽  
Vol 2 (3) ◽  
pp. 146-166 ◽  
Author(s):  
DAVID A. WOOLHISER
Keyword(s):  
Boundary Conditions ◽  
Watershed Modeling ◽  
Deterministic Approach ◽  
Mass Energy ◽  
Deterministic Models ◽  
Conservation Of Mass ◽  
Hydrologic Process ◽  
Theoretical Structure ◽  
Physically Based ◽  
Initial And Boundary Conditions

Physically-based, deterministic models, are considered in this paper. Physically-based, in that the models have a theoretical structure based primarily on the laws of conservation of mass, energy, or momentum; deterministic in the sense that when initial and boundary conditions and inputs are specified, the output is known with certainty. This type of model attempts to describe the structure of a particular hydrologic process and is therefore helpful in predicting what will happen when some change occurs in the system.

Modified Form of the Extended Kostiakov Equation Including Various Initial and Boundary Conditions

2009 ◽  
Vol 135 (4) ◽  
pp. 450-458 ◽  
Author(s):  
J. D. Valiantzas ◽  
E. D. Pollalis ◽  
K. X. Soulis ◽  
P. A. Londra
Keyword(s):  
Boundary Conditions ◽  
Initial And Boundary Conditions

scholarly journals On the differential system govering flows in magnetic field with data inLp

1998 ◽  
Vol 21 (2) ◽  
pp. 299-305 ◽  
Author(s):  
Fengxin Chen ◽  
Ping Wang ◽  
Chaoshun Qu
Keyword(s):  
Magnetic Field ◽  
Initial Data ◽  
Boundary Conditions ◽  
Differential System ◽  
Existence And Uniqueness ◽  
Mhd Equations ◽  
The Earth ◽  
Initial And Boundary Conditions ◽  
Time Existence ◽  
The Magnetic Field

In this paper we study the system governing flows in the magnetic field within the earth. The system is similar to the magnetohydrodynamic (MHD) equations. For initial data in spaceLp, we obtained the local in time existence and uniqueness ofweak solutions of the system subject to appropriate initial and boundary conditions.

Assessment of metolachlor and diuron leaching in a tropical soil using undisturbed soil columns under laboratory conditions

2013 ◽  
Vol 48 (2) ◽  
pp. 114-121 ◽  
Author(s):  
Eliana F.G.C. Dores ◽  
Luana De Souza ◽  
Ricardo D. Villa ◽  
Alicio Alves Pinto
Keyword(s):  
Tropical Soil ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Laboratory Conditions
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