scholarly journals Conceptual Model of Uranium in the Vadose Zone for Acidic and Alkaline Wastes Discharged at the Hanford Site Central Plateau

2014 ◽  
Author(s):  
Michael J. Truex ◽  
James E. Szecsody ◽  
Nikolla Qafoku ◽  
R. Jeffrey Serne
Keyword(s):  
Conceptual Model ◽  
Vadose Zone ◽  
Hanford Site ◽  
Central Plateau

scholarly journals Scale-Up Information for Gas-Phase Ammonia Treatment of Uranium in the Vadose Zone at the Hanford Site Central Plateau

2014 ◽  
Author(s):  
Michael J. Truex ◽  
James E. Szecsody ◽  
Lirong Zhong ◽  
Jonathan N. Thomle ◽  
Timothy C. Johnson
Keyword(s):  
Gas Phase ◽  
Vadose Zone ◽  
Scale Up ◽  
Ammonia Treatment ◽  
Hanford Site ◽  
Central Plateau

scholarly journals Gas-Phase Treatment of Technetium in the Vadose Zone at the Hanford Site Central Plateau

2014 ◽  
Author(s):  
Michael J. Truex ◽  
James E. Szecsody ◽  
Lirong Zhong ◽  
Nikolla Qafoku
Keyword(s):  
Gas Phase ◽  
Vadose Zone ◽  
Hanford Site ◽  
Central Plateau

scholarly journals Conceptual Model of Subsurface Processes for Iodine at the Hanford Site

2018 ◽  
Author(s):  
Nikolla P. Qafoku ◽  
Christopher E. Bagwell ◽  
Amanda R. Lawter ◽  
Michael J. Truex ◽  
James E. Szecsody ◽  
...  
Keyword(s):  
Conceptual Model ◽  
Hanford Site

scholarly journals Three-dimensional conceptual model for the Hanford Site unconfined aquifer system: FY 1994 status report

1994 ◽  
Author(s):  
P.D. Thorne ◽  
M.A. Chamness ◽  
V.R. Vermeul ◽  
Q.C. Macdonald ◽  
S.E. Schubert
Keyword(s):  
Conceptual Model ◽  
Three Dimensional ◽  
Unconfined Aquifer ◽  
Status Report ◽  
Hanford Site ◽  
Aquifer System

scholarly journals Desiccation-crack-induced salinization in deep clay sediment

2012 ◽  
Vol 9 (11) ◽  
pp. 13155-13189
Author(s):  
S. Baram ◽  
Z. Ronen ◽  
D. Kurtzman ◽  
C. Küells ◽  
O. Dahan
Keyword(s):  
Isotopic Composition ◽  
Conceptual Model ◽  
Pore Water ◽  
Vadose Zone ◽  
Land Surface ◽  
Water Infiltration ◽  
Arid Environments ◽  
Desiccation Cracks ◽  
The Impact ◽  
Desiccation Crack

Abstract. A study on water infiltration and solute transport in a clayey vadose zone underlying a dairy farm waste source was conducted to assess the impact of desiccation cracks on subsurface evaporation and salinization. The study is based on five years of continuous measurements of the temporal variation in the vadose zone water-content and on the chemical and isotopic composition of the sediment and pore-water in it. The isotopic composition of water stable isotopes (δ18O and δ2H) in water and sediment samples, from the area where desiccation crack networks prevail, indicated subsurface evaporation down to ∼3.5 m below land surface, and vertical and lateral preferential transport of water, following erratic preferential infiltration events. Chloride (Cl-) concentrations in the vadose zone pore water substantially increased with depth, evidence of deep subsurface evaporation and down flushing of concentrated solutions from the evaporation zones during preferential infiltration events. These observations led to development of a Desiccation-Crack-Induced Salinization (DCIS) conceptual model. DCIS suggests that thermally driven convective air flow in the desiccation cracks induces evaporation and salinization in relatively deep sections of the subsurface. This conceptual model supports previous conceptual models on vadose zone and groundwater salinization in fractured rock in arid environments and extends its validity to clayey soils in semi-arid environments.

scholarly journals Desiccation-crack-induced salinization in deep clay sediment

2013 ◽  
Vol 17 (4) ◽  
pp. 1533-1545 ◽  
Author(s):  
S. Baram ◽  
Z. Ronen ◽  
D. Kurtzman ◽  
C. Külls ◽  
O. Dahan
Keyword(s):  
Isotopic Composition ◽  
Conceptual Model ◽  
Pore Water ◽  
Vadose Zone ◽  
Land Surface ◽  
Water Infiltration ◽  
Arid Environments ◽  
Desiccation Cracks ◽  
The Impact ◽  
Desiccation Crack

Abstract. A study on water infiltration and solute transport in a clayey vadose zone underlying a dairy farm waste source was conducted to assess the impact of desiccation cracks on subsurface evaporation and salinization. The study is based on five years of continuous measurements of the temporal variation in the vadose zone water content and on the chemical and isotopic composition of the sediment and pore water in it. The isotopic composition of water stable isotopes (δ18O and δ2H) in water and sediment samples, from the area where desiccation crack networks prevail, indicated subsurface evaporation down to ~ 3.5 m below land surface, and vertical and lateral preferential transport of water, following erratic preferential infiltration events. Chloride (Cl−) concentrations in the vadose zone pore water substantially increased with depth, evidence of deep subsurface evaporation and down flushing of concentrated solutions from the evaporation zones during preferential infiltration events. These observations led to development of a desiccation-crack-induced salinization (DCIS) conceptual model. DCIS suggests that thermally driven convective air flow in the desiccation cracks induces evaporation and salinization in relatively deep sections of the subsurface. This conceptual model supports previous conceptual models on vadose zone and groundwater salinization in fractured rock in arid environments and extends its validity to clayey soils in semi-arid environments.

scholarly journals Microscale controls on the fate of contaminant uranium in the vadose zone, Hanford Site, Washington

2006 ◽  
Vol 70 (8) ◽  
pp. 1873-1887 ◽  
Author(s):  
James P. McKinley ◽  
John M. Zachara ◽  
Chongxuan Liu ◽  
Steven C. Heald ◽  
Brenda I. Prenitzer ◽  
...  
Keyword(s):  
Vadose Zone ◽  
Hanford Site
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