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This page documents the work of CS382 - Scientific Computing, Fall 2007
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==enVision Tabletop Groundwater Simulator==

General Instructions
* Setup 
* Teardown and cleaning
* Packing and travelling

Instructions for Demonstrations
* First one
* Second one
* etc.

==Computational Groundwater Simulations==

=== Fitz, Bryan and Mikio===
[[Image:gws.jpg|thumb||Confined aquifier simulation]]
[[Image:parabolic.jpg|thumb|right|Parabolic contaminant flow model]]
*Experiments
**Demonstrating porosity
***model water flow unconfined aquifier
**Illustrating groundwater flow in a confined aquifer
***We will use a cellular automata model where at the lowest level, a cell is either fresh water or contaminated. We see this problem split into two concepts - speed and direction. 
****Direction: The illustration to the right demonstrates our assumptions about how the water will move through the material. The simulation will calculate a new direction at each generation based on it's position relative to the known locations of water input and output.
****Speed: Remains constant throughout generations for a given run. The "speed" value represents a combination of speed of water flow and material porosity, and in terms of the simulation is the possibility that a a neighboring cell in the flow direction becomes contaminated.


**Describing recharge, transition and discharge areas
***modeling behavior of water recharge, discharge in wells, lake, etc

*Computational Tools
**C
***+Very fast
***+Libraries are available
***+Good distributed Libraries
***-Potentially difficult to use
***-no graphics libraries
**Netlogo
***+Fancy Graphics
***+Fun to use
***+Available examples/code
***-Slow
***-Small problem size
***-No Distributed processing

=== Peter and Mikio ===
* Experiment
** Describing the model
*** Describing the various parts of the Groundwater Simulator by attaching tags: Key words -- wells, artesian wells, lake, underground storage tank, septic tank, springs, vegetative layer, river/ocean, recharge area, discharge area, aquifers, confining layer, clay layers
** Illustrating and Calculating Porasity of different types of earth materials
** Determining how it is easy for ground water to move in different earth materials.
* Computetional Tool
** NetLogo for computatinal experiment

=== Brad and Nate ===

Our goal is an incremental approach towards illustrating groundwater contamination in a confined aquifer.  The confined aquifer, viewed between wells 1 and 8, offers an environment within the groundwater simulator with the fewest variables.  The first 4 experiments are an effort to illustrate the behavior and underlying science that must be understood and demonstrated in the final experiment.

*Experiments
** [[Cs382/Diffusion_Experiment|Diffusion]]
*** Show diffusion without groundwater movement.
** [[Cs382/Flow_Rate_Experiment|Flow Rate]]
*** Show the leading edge of groundwater contamination as a indicator of flow rate (related to section 5 and 13 in manual) 
** [[Cs382/Plume_Length_Experiment|Contaminant Plume Length]]
*** Determine whether contaminant plume length is affected by flow rate for a given amount of dye
** [[Cs382/Soil_Density_Experiment|Soil Density]]
*** Use displacement method and measurements of aquifer component to determine the density of the soil. We can use this value in silico.
** Illustrate laminar flow in a confined aquifer (Activity 7-1)
*** Show laminar flow between wells 1 and 8.

* Computational Tools
** NetLogo
*** + Visualization built in
*** + Agent and cell based simulation structure built in
*** - Possible limitation on world size / agent count in RAM
*** - Possible run time slower than groundwater simulator at higher flow rates
*** - Not parallel
** Python and MYMPI
*** + Parallelizable
*** + Faster than NetLogo in serial code ?
*** + Visualization software exists
**** TKInter - easy to install; seemingly easy to use
*** - Visualization software must be integrated
*** - MYMPI is untested
**** Need to compile stuff.

=== Activities in Manual ===
* Level I: Teaching Basic Groundwater Facts and Concepts with the Model
** 2-1: Demonstrating porosity
** 2-2: Porosity demonstrations
** 3-1: Illustrating the water table (groundwater not flowing)
** 3-2: Illustrating the water table (groundwater flowing)
** 3-3: Raising and lowering the water table
** 4-1: Describing recharge, transition and discharge areas
** 5-1: Describing the slope on the water table (hydraulic gradient)
** 6-1: Observing water level differences in wells in recharge and discharge areas
** 6-2: Potentiometric surfaces
** 7-1: Illustrating groundwater flow in a confined aquifer
** 7-2: Groundwater flow in an unconfined (water table) aquifer
** 8-1: Illustrating and describing groundwater contamination
** 9-1: Pump and Treat, How to operate the syringe system
** 9-2: In-situ treatment
* Level II: Using the Groundwater Model (Elementary - Middle School) 
** 10-1: Describing the model
** 11-1: Illustrating and calculating porosity
** 12-1: Estimating the permeability of soils
** 12-2: Graphing the permeability of soils
** 12-3: Determining the actual permeability (MS)
** 12-4:  Illustrating the water table
** 12-5: Explaining the water levels in water wells
** 12-6 Explaining a sloping water table
** 12-7 Determine the amount of water (discharge) flowing through the model
** 14-1: Demonstration illustrating what happens when contaminants in groundwater have densities that differ from groundwater
** 14-2: Illustrating how water wells are contaminated
** 14-3: Illustrating the effect of pumping wells on contaminated aquifers
** 14-4: Illustrating how contaminant concentrations can be changed in groundwater