## Abstract

HYDRASTAR is a code developed at Starprog AB for use in the SKB 91 performance assessment project with the following principal function: Reads the actual conductivity measurements from a file created from the data base GEOTAB. Regularizes the measurements to a user chosen calculation scale. Generates three dimensional unconditional realizations of the conductivity field by using a supplied model of the conductivity field as a stochastic function. Conditions the simulated conductivity field on the actual regularized measurements. Reads the boundary conditions from a regional deterministic NAMMU computation. Calculates the hydraulic head field, Darcy velocity field, stream lines and water travel times by solving the stationary hydrology equation and the streamline equation obtained with the velocities calculated from Darcy`s law. Generates visualizations of the realizations if desired. Calculates statistics such as semivariograms and expectation values of the output fields by repeating the above procedure by iterations of the Monte Carlo type. When using computer codes for safety assessment purpose validation and verification of the codes are important. This report describes a work performed with the goal of verifying parts of HYDRASTAR. The verification described uses comparisons with two other solutions of related examples: Comparison with a so called perturbation solution of
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## Citation Formats

Norman, S.
Verification of HYDRASTAR - A code for stochastic continuum simulation of groundwater flow.
Sweden: N. p.,
1991.
Web.

Norman, S.
Verification of HYDRASTAR - A code for stochastic continuum simulation of groundwater flow.
Sweden.

Norman, S.
1991.
"Verification of HYDRASTAR - A code for stochastic continuum simulation of groundwater flow."
Sweden.

@misc{etde_10111885,

title = {Verification of HYDRASTAR - A code for stochastic continuum simulation of groundwater flow}

author = {Norman, S}

abstractNote = {HYDRASTAR is a code developed at Starprog AB for use in the SKB 91 performance assessment project with the following principal function: Reads the actual conductivity measurements from a file created from the data base GEOTAB. Regularizes the measurements to a user chosen calculation scale. Generates three dimensional unconditional realizations of the conductivity field by using a supplied model of the conductivity field as a stochastic function. Conditions the simulated conductivity field on the actual regularized measurements. Reads the boundary conditions from a regional deterministic NAMMU computation. Calculates the hydraulic head field, Darcy velocity field, stream lines and water travel times by solving the stationary hydrology equation and the streamline equation obtained with the velocities calculated from Darcy`s law. Generates visualizations of the realizations if desired. Calculates statistics such as semivariograms and expectation values of the output fields by repeating the above procedure by iterations of the Monte Carlo type. When using computer codes for safety assessment purpose validation and verification of the codes are important. This report describes a work performed with the goal of verifying parts of HYDRASTAR. The verification described uses comparisons with two other solutions of related examples: Comparison with a so called perturbation solution of the stochastical stationary hydrology equation. This as an analytical approximation of the stochastical stationary hydrology equation valid in the case of small variability of the unconditional random conductivity field. Comparison with the (Hydrocoin, 1988), case 2. This is a classical example of a hydrology problem with a deterministic conductivity field. The principal feature of the problem is the presence of narrow fracture zones with high conductivity. The compared output are the hydraulic head field and a number of stream lines originating from a set of given positions.}

place = {Sweden}

year = {1991}

month = {Jul}

}

title = {Verification of HYDRASTAR - A code for stochastic continuum simulation of groundwater flow}

author = {Norman, S}

abstractNote = {HYDRASTAR is a code developed at Starprog AB for use in the SKB 91 performance assessment project with the following principal function: Reads the actual conductivity measurements from a file created from the data base GEOTAB. Regularizes the measurements to a user chosen calculation scale. Generates three dimensional unconditional realizations of the conductivity field by using a supplied model of the conductivity field as a stochastic function. Conditions the simulated conductivity field on the actual regularized measurements. Reads the boundary conditions from a regional deterministic NAMMU computation. Calculates the hydraulic head field, Darcy velocity field, stream lines and water travel times by solving the stationary hydrology equation and the streamline equation obtained with the velocities calculated from Darcy`s law. Generates visualizations of the realizations if desired. Calculates statistics such as semivariograms and expectation values of the output fields by repeating the above procedure by iterations of the Monte Carlo type. When using computer codes for safety assessment purpose validation and verification of the codes are important. This report describes a work performed with the goal of verifying parts of HYDRASTAR. The verification described uses comparisons with two other solutions of related examples: Comparison with a so called perturbation solution of the stochastical stationary hydrology equation. This as an analytical approximation of the stochastical stationary hydrology equation valid in the case of small variability of the unconditional random conductivity field. Comparison with the (Hydrocoin, 1988), case 2. This is a classical example of a hydrology problem with a deterministic conductivity field. The principal feature of the problem is the presence of narrow fracture zones with high conductivity. The compared output are the hydraulic head field and a number of stream lines originating from a set of given positions.}

place = {Sweden}

year = {1991}

month = {Jul}

}