RSICC DATA PACKAGE DLC-194
1. NAME AND TITLE OF DATA LIBRARY
LAS CRUCES DATABASE: Las Cruces Trench Site Database, Vadose Model.
2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS
New Mexico State University, Las Cruces, New Mexico, and
University of Arizona, Tucson, Arizona, through the Energy Science and
Technology Software Center, Oak Ridge, Tennessee.
4. HISTORICAL BACKGROUND AND INFORMATION
In 1988 a previous report presented results of the first U.S. Nuclear
Regulatory Commission trench experiment on the New Mexico State Ranch.
The purpose of this 1989 release is to bring together all data collected
during the course of the experiment on the morphology of the soil at the
site, and on the physical properties of the soil.
5. APPLICATION OF THE DATA
These data are required 1) to study the effect of spatial variability on water flow and transport in soils, 2) to validate deterministic and stochastic models of water flow and transport, 3) to provide experimental input as to how sites can be best characterized and monitored, and 4) to validate site characterization and monitoring methodologies.
The bore hole permeameter was used to determine the saturated hydraulic
conductivity in undisturbed soil adjacent to the core sample. Neutron probe
access tubes, tensiometers, and solute samplers were used to monitor multidimensional
water flow and solute movement. In experiment 1, a 4m by 9m area was uniformly
irrigated with a carefully controlled drip irrigation system. Water containing
tritium was applied during the first 10 days; thereafter, water was applied
without tritium for an additional 76 days. In experiment 2, a 1.22m by
12m area was uniformly irrigated using a carefully controlled drip irrigation
system. Water containing tritium and bromide was applied during the first
11.5 days; thereafter, water was applied without tracers for an additional
64 days. Both water and tracer movement were monitored during infiltration
and redistribution. Hydraulic property models, generated during site characterization,
were used in conjunction with a simple one-dimensional deterministic numerical
model which solves Richard's equation to predict infiltration at the site.
These predictions are compared to field observations of water movement
during infiltration for experiment 1. For experiment 2, field observations
of water, tritium, and bromide movement during infiltrations are given
along with comparisons between the field observations and the predictions
of a two-dimensional deterministic numerical model for water flow and solute
transport. The data are presented in 25 ASCII files.
6. SOURCE AND SCOPE OF DATA
The LAS CRUCES TRENCH SITE DATABASE includes raw and processed experimental
data obtained from the vadose zone model validation experiments performed
on the New Mexico State Ranch northeast of Las Cruces, New Mexico. Included
are data characterizing the unsaturated hydraulic properties for the experimental
site and dynamic data, such as water contents, tensions, and solute concentrations,
obtained during two infiltration/redistribution experiments. At the site,
a 26.4m long, 4.5m wide, and 5 mile deep trench was constructed in undisturbed
soil. During construction a total of 594 disturbed soil samples and 594
associated soil cores were taken from 9 distinct soil layers identified
on the north wall. Samples were also taken from three vertical transects
on this wall. Data included in the database are sample locations, a description
of the 9 soil layers, bore hole saturated hydraulic conductivities and
outflow data, laboratory saturated hydraulic conductivities, soil water
retention data, particle size distribution data, bulk density data, parameters
used to fit the van Genuchten equation to the water retention data, and
estimated van Genuchten parameters for each layer and the entire site.
Data obtained from two experiments designed to provide data for testing
deterministic and stochastic models of vadose zone flow and transport are
7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM
No data retrieval program is included.
8. DATA FORMAT AND COMPUTER
ASCII data files; All computers (D00194ALLCP00).
9. TYPICAL RUNNING TIME
NESC, "LAS CRUCES Trench Site Database, NESC No. 1140, LAS CRUCES Trench Site Database Flexible Disk Cartridge Descriptions," National Energy Software Center Note 92-14 (October 16, 1991).
P.J. Wierenga, A.F. Toorman, D.B. Hudson, J. Vinson, M. Nash, and R.G. Hills, Soil Physical Properties at the Las Cruces Trench Site, NUREG/CR-5441 (November 1989).
P.J. Wierenga, D.B. Hudson, R.G. Hills, I. Porro, M.R. Kirkland, and J. Vinson, Flow and Transport at the Las Cruces Trench Site, Experiments 1 and 2, NUREG/CR-5607 (August 1990).
11. CONTENTS OF LIBRARY
Included are the reference documents and software on one-3.5" HD diskette
with a WINDOWS ® self-extracting executable from PkWare® which
contains the ASCII text files.
12. DATE OF ABSTRACT
These data were contributed to NESC in September 1990 then transferred
to ESTSC and then to RSICC where they were released November 2000.
KEYWORDS: ENVIRONMENTAL DOSE; HYDRODYNAMICS