Scientific Investigations Report 2006-5122
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5122
Table B1. Information needed for constructing conceptual models at regional, subregional, and local scales.
| Conceptual model component | Regional Aquifer System Analysis, regional-scale model | Idaho National Laboratory and vicinity, subregional-scale model | Idaho National Laboratory facility, local-scale model |
|---|---|---|---|
| Model boundaries | Extent and saturated thickness of aquifer | Northwestern extent of aquifer | Extent of perched ground water |
| Southwestern extent of waste solutes | Locations of local hydraulic boundaries (flowline or distant specified head) | ||
| Locations of stable hydraulic boundaries (northeastern zone of steep head gradients, southeastern regional flowline) | Local ground-water velocity field | ||
| Saturated thickness of aquifer | Effective saturated thickness of aquifer (local confining unit below waste solutes) | ||
| Hydrogeologic framework | Stratigraphy of regional geologic formations and groups | Stratigraphy of regional geologic formations and groups | Stratigraphy of individual basalt flows, basalt-flow groups, and sedimentary interbeds |
| Stratigraphy of composite basalt flows and basalt-flow groups | |||
| Distribution of hydraulic properties | Distribution of major rock types (basalt; silicic rocks; clay, silt, sand, and gravel) | Distribution of hydrogeologic units (younger rocks, rocks of intermediate age, sediment, silicic rocks, older rocks) | Distribution of hydrogeologic units (local impeding layers or confining units) |
| Distribution of major rock types (fractured, dense, and altered basalt; silicic rocks; clay, silt, sand, and gravel) | Distribution of major rock types (thin or thick pahoehoe basalt flows; near-vent volcanic deposits; dikes; clay, silt, sand, and gravel) | ||
| Distribution of local stratigraphic units | Distribution of local stratigraphic units | ||
| Distribution of subregional geologic settings (rhyolite domes; sedimentary troughs; areas of subsidence, uplift, and dipping beds; volcanic rift zones and vent corridors) | Distribution of local geologic settings (vent corridors, sedimentary depositional environments) | ||
| Hydrologic fluxes | Measured flux (Snake River gains and losses, spring flow) | Measured flux (streamflow infiltration from the Big Lost River channel, sinks, playas, and spreading areas) | Measured flux (streamflow losses in Big Lost River channel, sinks, playas, and spreading areas) |
| Estimated flux (ground-water pumpage, irrigation return flow, stream and canal losses, tributary basin underflow, precipitation recharge) | Estimated flux (ground-water pumpage, irrigation return flow, ground water from or to adjacent parts of the aquifer, tributary-valley underflow, precipitation recharge, flow from underlying rocks) | Estimated flux (ground-water pumpage, ground water from or to adjacent parts of the aquifer, infiltration of precipitation, injection and infiltration of wastewater, water-system leaks, landscape-watering return flow) | |
| Ground-water movement | Long-term (20 to 50 years) changes in climate and irrigation practices | Episodic and localized streamflow infiltration resulting from short-term (3 to 8 years) changes in climate | Thickness and orientation of preferential flowpaths (for example - fractures, lava tubes, etc.) |
U.S.
Department of the Interior | U.S. Geological
Survey
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