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- Title
Use of a watershed hydrologic model to estimate interbasin groundwater flow in a Costa Rican rainforest.
- Authors
Zanon, Carlo; Genereux, David P.; Oberbauer, Steven F.
- Abstract
The watershed hydrologic model TOPMODEL was used to estimate interbasin groundwater flow (IGF) into a small lowland rainforest watershed in Costa Rica. IGF is a common hydrological process but often difficult to quantify. Four-year simulations (2006-2009) using three different model approaches gave estimates of IGF that were very similar to each other (10.1, 10.2, and 9.8 m/year) and to an earlier estimate (10.0 m/year) based on 1998-2002 data from a budget study that did not use a hydrologic simulation model, providing confidence in the new estimates and suggesting each of the three model approaches is viable. Results show no significant temporal variation in IGF during 2006-2009 (or between this period and the earlier study from 1998-2002). Simulations of the 16 consecutive 3-month periods in 2006-2009 gave 16 values of IGF rate with a mean (10.1 m/year, standard deviation = 0.6 m/year) very similar to the estimates above from the 4-year simulations. This suggests the modified version of TOPMODEL can be used to model stream discharge and estimate IGF for sub-annual time periods during which change in water storage is not necessarily equal to zero. Thus, simple watershed models may be used to estimate IGF based on even relatively short calibration periods, making such models useful tools in the study of this widespread hydrological process that affects water and chemical fluxes and budgets but is often difficult and costly to quantify. Copyright © 2013 John Wiley & Sons, Ltd.
- Subjects
COSTA Rica; GROUNDWATER flow; WATERSHEDS; RAIN forests; HYDROLOGIC models
- Publication
Hydrological Processes, 2014, Vol 28, Issue 10, p3670
- ISSN
0885-6087
- Publication type
Article
- DOI
10.1002/hyp.9917