scholarly journals BOUNDING UNCERTAINTY IN UNSATURATED-ZONE FLOW THROUGH DIFFERENT CONCEPTUAL MODELS OF FRACTURE-MATRIX INTERACTION.

1997 ◽  
Author(s):  
MICHAEL L. WILSON, G.S. BODVARSSON SUSAN J. ALTMAN
Keyword(s):  
Unsaturated Zone ◽  
Conceptual Models ◽  
Matrix Interaction ◽  
Flow Through

scholarly journals Conceptual Models of Flow through a Heterogeneous, Layered Vadose Zone under a Percolation Pond

2004 ◽  
Author(s):  
Kristine Baker ◽  
Larry Hull ◽  
Jesse Bennett ◽  
Shannon Ansley ◽  
Gail Heath
Keyword(s):  
Vadose Zone ◽  
Conceptual Models ◽  
Flow Through

scholarly journals Quantifying structural uncertainty due to discretisation resolution and dimensionality in a hydrodynamic polder model

2009 ◽  
Vol 11 (1) ◽  
pp. 19-30 ◽  
Author(s):  
C. Sehnert ◽  
S. Huang ◽  
K.-E. Lindenschmidt
Keyword(s):  
Conceptual Models ◽  
Flow Characteristics ◽  
Monte Carlo Analysis ◽  
Structural Uncertainty ◽  
Flood Modelling ◽  
River Elbe ◽  
Complex Models ◽  
1D Model ◽  
Flow Through ◽  
Spatial Discretisation

In flood modelling, the structure of conceptual models may have a large influence on the simulation results. Hence, the focus of this paper is on the structural uncertainty in hydrodynamic flood modelling systems. Three different conceptual models with an increasing order of complexity of the spatial discretisation of the flow through a polder system were compared in order to investigate the effect of spatial resolution and dimensionality on flood modelling. The hydrodynamic 1D model DYNHYD was used as a basis for the simulations. The model was extended to incorporate a quasi-2D approach and a Monte Carlo analysis was used to show the effect of structural uncertainty on the resulting flow characteristics of the diverted flood waters. Two flood events of the River Elbe were used to calibrate and test the model. The results of the velocity fields indicate that the simplest 1D model revealed more predictive uncertainty than the other two more complex models. The differences in model structure does not cause large differences in the capping of the peak discharges, but may substantially influence the results of subsequent modelling of sediment and contaminant transport.

Effect of the Residual Heat Release of the Nuclear Waste Stored in an Unsaturated Zone on Radionuclide Release

2010 ◽  
Author(s):  
Lubna K. Hamdan ◽  
John C. Walton ◽  
Arturo Woocay
Keyword(s):  
Heat Release ◽  
Nuclear Waste ◽  
Unsaturated Zone ◽  
Yucca Mountain ◽  
Minimum Length ◽  
General Corrosion ◽  
Waste Package ◽  
Flow Through ◽  
Radionuclide Release ◽  
Residual Heat

Over time, nuclear waste packages disposed in geological repositories are expected to fail gradually due to localized and general corrosion. As a result, water will have access to the nuclear waste and radionuclides will be transported to the accessible environment by ground water. In this paper we consider a serious failure case in which penetrations at the top and bottom of the waste package will allow water to flow through it (flow-through model). We introduce a new conceptual model that examines the effect of the residual heat release of the nuclear waste stored in an unsaturated environment on radionuclide release. This model predicts that the evaporation of water at the hotter sheltered areas (from condensate and seepage) inside the failed waste package will create a capillary pressure gradient that drives water to wick with its dissolved and suspended contents toward these relict areas, effectively preventing radionuclides release. We drive a dimensionless group to estimate the minimum length of the sheltered areas required to sequester radionuclides and prevent their release. The implications of this model on the performance of the proposed repository at Yucca Mountain or unsaturated zone geological repositories in general are explored.

Numerical modelling of fluid flow through unsaturated zone using a dual-porosity approach

2013 ◽  
Vol 19 (2) ◽  
pp. 97-110 ◽  
Author(s):  
S. Mohanasundaram ◽  
G. Suresh Kumar ◽  
Balaji Narasimhan
Keyword(s):  
Fluid Flow ◽  
Numerical Modelling ◽  
Unsaturated Zone ◽  
Dual Porosity ◽  
Flow Through

Modelling of water flow through typical Bavarian soils: 1. Estimation of hydraulic characteristics of the unsaturated zone

2006 ◽  
Vol 51 (2) ◽  
pp. 285-297 ◽  
Author(s):  
STANISŁAW MACIEJEWSKI ◽  
PIOTR MAŁOSZEWSKI ◽  
CHRISTINE STUMPP ◽  
DIETMAR KLOTZ
Keyword(s):  
Water Flow ◽  
Unsaturated Zone ◽  
Hydraulic Characteristics ◽  
Flow Through

Chlorine-36 data at Yucca Mountain: statistical tests of conceptual models for unsaturated-zone flow

2003 ◽  
Vol 62-63 ◽  
pp. 43-61 ◽  
Author(s):  
Katherine Campbell ◽  
Andrew Wolfsberg ◽  
June Fabryka-Martin ◽  
Donald Sweetkind
Keyword(s):  
Unsaturated Zone ◽  
Conceptual Models ◽  
Statistical Tests ◽  
Yucca Mountain ◽  
Chlorine 36
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