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Name: Walt McNab

Type: User

Bio: I am a computational environmental scientist, focusing on data analysis, numerical modeling, scientific programming, and hydrogeology.

Location: Concord, CA

Blog: https://numericalenvironmental.wordpress.com/

Walt McNab's Projects

1-d-diffusion

Julia script for modeling 1-D gaseous diffusion in porous media with fixed boundary conditions

a_prototype_lake_package_for_solute_transport_modeling_with_phast

This Python script provides a limited groundwater-lake water interaction modeling capability to the U.S. Geological Survey’s PHAST reactive transport model.

alluvial_fan_formation_simulator

This repository contains the source code, example input files, and Windows executable for an alluvial fan formation simulator, written in D language.

analytical_element_model

Analytic element groundwater model, written in python, that uses a leaky aquifer solution and can model faults, wells, and line injectors

coupled_gas_water_flow_and_transport_porous_media

This Julia language (version 0.5) script solves the coupled partial differential equations associated with (1) compressible gas flow in partially water-saturated porous media, (2) partially-saturated flow of water (essentially amounting to a solution of the Richards equation using the Van Genuchten equations for capillarity and relative permeability), and (3) advective-dispersive transport of both aqueous-phase solutes and gas components in the respective media.

coupled_gas_water_transport_with_geochemistry

A two-phase (water + gas) reactive transport model, written in Julia, that also simulates geochemical reactions between water-gas-mineral phases via a link with PHREEQC.

diamond-square_terrain_and_3d_lattice_generation_with_python_and_pandas

This is a relatively short python script (works with versions 2 or 3) for generating fractal surfaces or volumes, starting with an arbitrary initial lattice.

ecology_food_web

Experimental (just for fun) food web model with dynamic plant, herbivore, and carnivore populations living in a 2-D grid. Written in D-language.

$facilitator_scripts_for_reactive_flow_through_fractured_rock_with_phreeqc icon$ facilitator_scripts_for_reactive_flow_through_fractured_rock_with_phreeqc

This repository contains python scripts for pre- and post-processing PHREEQC simulations for flow through a dual-porosity column, emulating reactive transport through fractured porous media.

groundwater_chem_data_explorer

A simple python script for processing and analyzing a large, multi-parameter groundwater quality data set

gw_quality_classifier

This is python 2.7 script which reads, processes, and evaluates a large, multi-county groundwater quality data set.

heuristic_model_for_aquifer-aquitard_structures_in_fluvial_environments

This julia script models the formation of aquifer-aquitard structures in a fluvial setting.

heuristic_simulation_of_erosion_and_hydrologic_feature_formation

This julia language script reads an initial N x N grid of elevations across an x-y plane and simulates the formation of erosional and hydrologic features in response to user-supplied input parameters.

leaky_aquifer_analytical_model_for_gas_flow

This Python script models the steady-state pressure distribution and gas mass fluxes associated with operation of a soil vapor extraction (SVE) system in a leaky aquifer setting.

lnapl-in-an-unconfined-aquifer

A Julia-language script for modeling LNAPL floating on top of groundwater in a single-layer unconfined aquifer using an integral finite difference methodology

mfp

3-D multiphase flow model, written in D-language, plus sample input files

modeling_groundwater_mounding_using_d-language

This is a relatively short program, written and compiled in D-language (https://dlang.org/), which simulates time-dependent mounding of groundwater in an unconfined aquifer underneath recharge basin(s), subject to pumping from nearby well(s).

monte_carlo_atmospheric_plume

Air plume dispersion model, written in R - Monte Carlo mode enables multiple realizations

multiphase_percolation_front

A scilab script that models 1-D gravity-driven multiphase flow/percolation; a Monte Carlo version is also included

numerical_solver_in_python_for_soil_infiltration_tests

This is a short Python 3 script that uses the SciPy package’s integrate.odeint method to solve a set of coupled ordinary differential equations approximating the infiltration of a wetting front into unsaturated soil.

numerical_toolkit_for_approximating_groundwater_flow_field_from_scattered_data

This Julia script imports and interpolates scattered hydraulic head and hydraulic conductivity data (for a single-layer aquifer) using ordinary kriging.

parsing_a_numerical_alluvial_fan_model_for_modflow

This Python script parses the output of a simulated alluvial fan formation model into layers to support construction of a MODFLOW model for groundwater flow through the fan.

partially_saturated_groundwater_flow_model_in_julia

This julia script is a complete groundwater flow model based on the integral finite difference method.

pumping_test_interpretation_with_python

This is a Python (version 2 or 3) script to aid in the interpretation of aquifer pumping tests using the Theis (1935) and Hantush and Jacob (1955) solutions for confined and leaky confined aquifers, respectively, as well as a simple numerical method-of-lines solution for an unconfined aquifer with wellbore storage.

python_script_for_statistical_resampling_and_modeling_of_multivariate_water_quality_data

This special-purpose Python script reads a multivariate water quality data set, generates a larger synthetic data set with matching parameter probability distributions and pairwise correlations, and runs PHREEQC speciation simulations on the synthetic data.

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