
NSF Org: |
EAR Division Of Earth Sciences |
Recipient: |
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Initial Amendment Date: | June 3, 2005 |
Latest Amendment Date: | May 30, 2008 |
Award Number: | 0510819 |
Award Instrument: | Continuing Grant |
Program Manager: |
L. Douglas James
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
Start Date: | July 1, 2005 |
End Date: | December 31, 2008 (Estimated) |
Total Intended Award Amount: | $0.00 |
Total Awarded Amount to Date: | $210,714.00 |
Funds Obligated to Date: |
FY 2006 = $107,611.00 |
History of Investigator: |
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Recipient Sponsored Research Office: |
3640 COLONEL GLENN HWY DAYTON OH US 45435-0002 (937)775-2425 |
Sponsor Congressional District: |
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Primary Place of Performance: |
3640 COLONEL GLENN HWY DAYTON OH US 45435-0002 |
Primary Place of
Performance Congressional District: |
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Unique Entity Identifier (UEI): |
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Parent UEI: |
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NSF Program(s): | Hydrologic Sciences |
Primary Program Source: |
app-0106 |
Program Reference Code(s): |
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Program Element Code(s): |
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Award Agency Code: | 4900 |
Fund Agency Code: | 4900 |
Assistance Listing Number(s): | 47.050 |
ABSTRACT
0510819
Ritzi
Complexity and uncertainty in ground water flow and transport are related to heterogeneity in the hydraulic properties of natural porous media. In deposits of sediment this heterogeneity is related to the sedimentary architecture, of which the important aspects are the proportions, geometry, and juxtapositioning relationships of sedimentary units. These are units created at different spatial scales under various processes of deposition and erosion and organized within a hierarchical framework. Realistic representations of aquifer architecture within hydrogeologic models must be achieved because the geologic structures reduce entropy in hydraulic properties from the maximally disordered state. At the same time, these structures can create greater entropy in transport statistics compared to those from a maximum entropy spatial field (e.g., models containing interconnected gravel units within a lower permeability background have greater variance in mass residence time statistics than models containing random, unconnected gravel patches).
A digital representation of a sedimentary deposit will be created with realistic architecture from the scale of centimeters up to the scale of kilometers. A model with this range of scales is unprecedented. The digital deposit will represent the hierarchical sedimentary architecture of fluvial braid-belt deposits, common in both aquifers and in petroleum reservoirs. The digital deposit will be a synthetic but realistic data set for use in computational experiments in hydrogeology. As such, it will have a sedimentary architecture that is consistent with known depositional processes, with the shapes and scales of depositional bedforms, and with field measurements of stratification geometries and grain-size variations. Developing a digital deposit over this range of scales will require quantifying the three-dimensional architecture from a large amount of data collected within a modern river system, developing simulation algorithms tailored to those findings, and developing efficient means of computational storage. The model will be created with geometric simulation on a centimeter-spaced regular grid that facilitates its import into other types of numerical models (e.g., models for ground-water flow and transport). The digital deposit, together with its unique storage structure and generating algorithms, will be made freely available to the research community.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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