GMS:Risk Analysis Wizard: Difference between revisions
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===Threshold Analysis=== | ===Threshold Analysis=== | ||
Threshold analysis is similar to capture zone analysis, but threshold analysis can be performed using any type of 3D data set that has been read into the [[GMS:Project Explorer|Project Explorer]]. You first select a simulation set from the [[GMS:The GMS Screen|Project Explorer]]. Next, you set up rules for generating a probabilistic threshold | Threshold analysis is similar to capture zone analysis, but threshold analysis can be performed using any type of 3D data set that has been read into the [[GMS:Project Explorer|Project Explorer]]. You first select a simulation set from the [[GMS:The GMS Screen|Project Explorer]]. Next, you set up rules for generating a probabilistic threshold dataset. For example, you might be looking at a specific contaminant and want to know what the probability is that the concentration of this contaminant will be above the EPA level for drinking water. You would generate a rule reflecting this limit. After processing all rules for each simulation, GMS creates a probabilistic threshold dataset. | ||
==Risk Analysis Wizard Dialogs== | ==Risk Analysis Wizard Dialogs== | ||
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'''Analysis Options | '''Analysis Options – Individual wells''' | ||
Choose this option to create a probabilistic capture zone for each uniquely named well in the MODFLOW model. | Choose this option to create a probabilistic capture zone for each uniquely named well in the MODFLOW model. | ||
'''Analysis Options | '''Analysis Options – Well groups''' | ||
Choose this option to create a probabilistic capture zone for each different zone code number. | Choose this option to create a probabilistic capture zone for each different zone code number. | ||
'''Particle Starting Locations | '''Particle Starting Locations – Distribute particles on water table surface''' | ||
Choose this option to distribute particles only on the water table surface. By default, one particle is placed at the ''xy'' center of the cell at the water table, but you can use the '''Particle placement within cells''' option to change the number of particles placed on the water table in each cell. This option will create a 2D probabilistic capture zone representing the intersection of the entire 3D probabilistic capture zone with the water table. | Choose this option to distribute particles only on the water table surface. By default, one particle is placed at the ''xy'' center of the cell at the water table, but you can use the '''Particle placement within cells''' option to change the number of particles placed on the water table in each cell. This option will create a 2D probabilistic capture zone representing the intersection of the entire 3D probabilistic capture zone with the water table. | ||
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===Threshold Analysis Dialog=== | ===Threshold Analysis Dialog=== | ||
Threshold analysis can be performed on any collection of 3D data sets. The threshold analysis data set is created by using rules. For each rule, you select a dataset (only applies to solutions with multiple data sets.), the greater or less than sign and a value. You can have as many rules as you want. The AND and OR logic options allow you to use | Threshold analysis can be performed on any collection of 3D data sets. The threshold analysis data set is created by using rules. For each rule, you select a dataset (only applies to solutions with multiple data sets.), the greater or less than sign and a value. You can have as many rules as you want. The AND and OR logic options allow you to use: 1st rule AND 2nd rule AND 3rd rule; or 1st rule OR 2nd rule OR 3rd rule. Threshold analysis creates one 3D dataset. | ||
[[Image:ra_1.jpg|center|250px]] | [[Image:ra_1.jpg|center|250px]] | ||
