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Title: Real-case benchmark for flow and tracer transport in the fractured rock

The paper is intended to define a benchmark problem related to groundwater flow and natural tracer transport using observations of discharge and isotopic tracers in fractured, crystalline rock. Three numerical simulators: Flow123d, OpenGeoSys, and PFLOTRAN are compared. The data utilized in the project were collected in a water-supply tunnel in granite of the Jizera Mountains, Bedrichov, Czech Republic. The problem configuration combines subdomains of different dimensions, 3D continuum for hard-rock blocks or matrix and 2D features for fractures or fault zones, together with realistic boundary conditions for tunnel-controlled drainage. Steady-state and transient flow and a pulse injection tracer transport problem are solved. The results confirm mostly consistent behavior of the codes. Both the codes Flow123d and OpenGeoSys with 3D–2D coupling implemented differ by several percent in most cases, which is appropriate to, e.g., effects of discrete unknown placing in the mesh. Some of the PFLOTRAN results differ more, which can be explained by effects of the dispersion tensor evaluation scheme and of the numerical diffusion. Here, the phenomenon can get stronger with fracture/matrix coupling and with parameter magnitude contrasts. Although the study was not aimed on inverse solution, the models were fit to the measured data approximately, demonstrating the intendedmore » real-case relevance of the benchmark.« less
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [2] ;  [4] ;  [5]
  1. Technical Univ. of Liberec, Liberec (Czech Republic)
  2. Federal Institute for Geosciences and Natural Resources, Hanover (Germany)
  3. Univ. of Montana, Missoula, MT (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Radioactive Waste Repository Authority (SURAO), Praha (Czech Republic)
Publication Date:
Report Number(s):
SAND-2016-12360J
Journal ID: ISSN 1866-6280; PII: 6061
Grant/Contract Number:
AC04-94AL85000
Type:
Published Article
Journal Name:
Environmental Earth Sciences
Additional Journal Information:
Journal Volume: 75; Journal Issue: 18; Journal ID: ISSN 1866-6280
Publisher:
Springer-Verlag
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; numerical model; tunnel inflow; natural tracer; transit time; multidimensional; code comparison
OSTI Identifier:
1325397
Alternate Identifier(s):
OSTI ID: 1341399