| Abstract: | This study analyzes the regional groundwater system at Poas and demonstrates the likelihood that the water discharging from the acidic springs in the Rio Agrio watershed originates at the acidic crater lake. Both heat and solute transport are analyzed on a regional scale through numerical simulations using the HST3D finite-difference model, which solves the coupled equations for fluid flow, heat transport, and solute transport. The code allows fluid viscosity and density to be functions of both temperature and solute concentration. The simulations use estimates for recharge to the mountain and a range of values and various distributions of permeability and porosity. Several sensitivity analyses are performed to test how the uncertainty in many of the model parameters affects the simulation results. These uncertainties yield an estimated range of travel times from the crater lake to the Rio Agrio springs of 1-30 yr, which is in close agreement with the results of tritium analyses of the springs. Calculated groundwater fluxes into and out of the crater lake are both about several hundred kg/s. These fluxes must be accounted for in water budgets of the crater lake. -from Authors |
| Genre: | Article |
| ProdID: | 70018840 |
| Citation Author: | Sanford, W. E.; Konikow, L. F.; Rowe, Jr, G. L.; Brantley, S. L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 293 |
| Citation Issue: | 3-4 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 25 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Elsevier |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Groundwater transport of crater-lake brine at Poas Volcano, Costa Rica; 1995; Article; Journal; Journal of Volcanology and Geothermal Research; Sanford, W. E.; Konikow, L. F.; Rowe, Jr, G. L.; Brantley, S. L. |
| Citation Start Page: | 269 |
| Citation Volume: | 64 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Groundwater transport of crater-lake brine at Poas Volcano, Costa Rica; 1995; Article; Journal; Journal of Volcanology and Geothermal Research; Sanford, W. E.; Konikow, L. F.; Rowe, Jr, G. L.; Brantley, S. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0377-0273(94)00080-Z |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
| Publisher: | Elsevier |
