scholarly journals GOLDSIM E-AREA LOW-LEVEL WASTE FACILITY VADOSE ZONE MODEL BENCHMARKING

2020 ◽  
Author(s):  
JENNIFER WOHLWEND ◽  
SEBASTIAN ALEMAN
Keyword(s):  
Vadose Zone ◽  
Zone Model ◽  
Low Level ◽  
Waste Facility

scholarly journals GOLDSIM E-AREA LOW-LEVEL WASTE FACILITY AQUIFER ZONE MODEL CALIBRATION METHODOLOGY

2020 ◽  
Author(s):  
JENNIFER WOHLWEND ◽  
LUTHER HAMM
Keyword(s):  
Model Calibration ◽  
Zone Model ◽  
Low Level ◽  
Waste Facility

Applying a Vadose Zone Model to Stormwater Infiltration

2006 ◽  
Author(s):  
J. B. Mikula ◽  
S. E. Clark ◽  
K. H. Baker
Keyword(s):  
Vadose Zone ◽  
Zone Model ◽  
Stormwater Infiltration

Performance Assessment of Low-Level Waste Disposal Facilities Using Coupled Unsaturated Flow and Reactive Transport Simulators

2002 ◽  
Vol 713 ◽  
Author(s):  
Diana H. Bacon ◽  
B. Peter McGrail ◽  
Vicky L. Freedman ◽  
Giancarlo Ventura ◽  
Piero Risoluti ◽  
...  
Keyword(s):  
Waste Disposal ◽  
Vadose Zone ◽  
Reactive Transport ◽  
Unsaturated Flow ◽  
Filler Materials ◽  
Release Rates ◽  
Glass Waste ◽  
Shallow Subsurface ◽  
Low Level ◽  
Reactive Chemical Transport

ABSTRACTRecent advances in the development of reactive chemical transport simulators have made it possible to use these tools in performance assessments (PAs) for nuclear waste disposal. Reactive transport codes were used to evaluate the impacts of design modifications on the performance of two shallow subsurface disposal systems for low-level radioactive waste. The first disposal system, located at the Hanford site in Richland, Washington, is for disposal of lowlevel waste glass. Glass waste blocks will be disposed in subsurface trenches, surrounded by backfill material. Using different waste package sizes and layering had a small impact on technetium release rates to the vadose zone. The second disposal system involves a hypothetical repository for low-level waste in Italy. A model of uranium release from a grout waste form was developed using the STORM reactive transport code. Uranium is predicted to be relatively insoluble for several hundred years under the high-pH environment of the cement pore water. The effect of using different filler materials between the waste packages on uranium flux to the vadose zone proved to have a negligible impact on release rates.

scholarly journals Closure Plan for the E-Area Low-Level Waste Facility

2004 ◽  
Author(s):  
MARKA l PHIFER
Keyword(s):  
Low Level ◽  
Waste Facility

scholarly journals Protocol for the E-Area Low Level Waste Facility Disposal Limits Database

2006 ◽  
Author(s):  
R Swingle
Keyword(s):  
Low Level ◽  
Waste Facility

scholarly journals A case study of field-scale maize irrigation patterns in western Nebraska: implications for water managers and recommendations for hyper-resolution land surface modeling

2017 ◽  
Vol 21 (2) ◽  
pp. 1051-1062 ◽  
Author(s):  
Justin Gibson ◽  
Trenton E. Franz ◽  
Tiejun Wang ◽  
John Gates ◽  
Patricio Grassini ◽  
...  
Keyword(s):  
Vadose Zone ◽  
Land Surface ◽  
Spatial Scales ◽  
Crop Model ◽  
Zone Model ◽  
Field Scale ◽  
Maize Production ◽  
Operational Forecasts ◽  
Local Water ◽  
Model Benchmark

Abstract. In many agricultural regions, the human use of water for irrigation is often ignored or poorly represented in land surface models (LSMs) and operational forecasts. Because irrigation increases soil moisture, feedback on the surface energy balance, rainfall recycling, and atmospheric dynamics is not represented and may lead to reduced model skill. In this work, we describe four plausible and relatively simple irrigation routines that can be coupled to the next generation of hyper-resolution LSMs operating at scales of 1 km or less. The irrigation output from the four routines (crop model, precipitation delayed, evapotranspiration replacement, and vadose zone model) is compared against a historical field-scale irrigation database (2008–2014) from a 35 km2 study area under maize production and center pivot irrigation in western Nebraska (USA). We find that the most yield-conservative irrigation routine (crop model) produces seasonal totals of irrigation that compare well against the observed irrigation amounts across a range of wet and dry years but with a low bias of 80 mm yr−1. The most aggressive irrigation saving routine (vadose zone model) indicates a potential irrigation savings of 120 mm yr−1 and yield losses of less than 3 % against the crop model benchmark and historical averages. The results of the various irrigation routines and associated yield penalties will be valuable for future consideration by local water managers to be informed about the potential value of irrigation saving technologies and irrigation practices. Moreover, the routines offer the hyper-resolution LSM community a range of irrigation routines to better constrain irrigation decision-making at critical temporal (daily) and spatial scales (< 1 km).

Sign in / Sign up

Export Citation Format

Share Document