| Abstract: | The groundwater system in southern Oahu, Hawaii consists of a thick, areally extensive freshwater lens overlying a zone of transition to a thick saltwater body. This system is analyzed in cross section with a variable-density groundwater flow and solute transport model on a regional scale. The simulation is difficult, because the coastal aquifer system has a saltwater transition zone that is broadly dispersed near the discharge area, but is very sharply defined inland. Steady-state simulation analysis of the transition zone in the layered basalt aquifer of southern Oahu indicates that a small transverse dispersivity is characteristic of horizontal regional flow. Further, in this system flow is generally parallel to isochlors and steady-state behavior is insensitive to the longitudinal dispersivity. Parameter analysis identifies that only six parameters control the complex hydraulics of the system: horizontal and vertical hydraulic conductivity of the basalt aquifer; hydraulic conductivity of the confining "caprock" layer; leakance below the caprock; specific yield; and aquifer matrix compressibility. The best-fitting models indicate the horizontal hydraulic conductivity is significantly greater than the vertical hydraulic conductivity. These models give values for specific yield and aquifer compressibility which imply a considerable degree of compressive storage in the water table aquifer. ?? 1987. |
| Genre: | Article |
| ProdID: | 70015251 |
| Citation Author: | Souza, W. R.; Voss, C. I. |
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| Citation End Page: | 41 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Hydrology |
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| Citation Number Of Pages: | 25 |
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| Citation Search Results Text: | Analysis of an anisotropic coastal aquifer system using variable-density flow and solute transport simulation; 1987; Article; Journal; Journal of Hydrology; Souza, W. R.; Voss, C. I. |
| Citation Start Page: | 17 |
| Citation Volume: | 92 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Analysis of an anisotropic coastal aquifer system using variable-density flow and solute transport simulation; 1987; Article; Journal; Journal of Hydrology; Souza, W. R.; Voss, C. I. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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