| Abstract: | Evapotranspiration (ET) approximations, usually based on computed potential ET (PET) and diverse PET-to-ET conceptualizations, are routinely used in hydrologic analyses. This study presents an approach to incorporate measured (actual) ET data, increasingly available using micrometeorological methods, to define the adequacy of ET approximations for hydrologic simulation. The approach is demonstrated at a site where eddy correlation-measured ET values were available. A baseline hydrologic model incorporating measured ET values was used to evaluate the sensitivity of simulated water levels, subsurface recharge, and surface runoff to error in four ET approximations. An annually invariant pattern of mean monthly vegetation coefficients was shown to be most effective, despite the substantial year-to-year variation in measured vegetation coefficients. The temporal variability of available water (precipitation minus ET) at the humid, subtropical site was largely controlled by the relatively high temporal variability of precipitation, benefiting the effectiveness of coarse ET approximations, a result that is likely to prevail at other humid sites. |
| Genre: | Article |
| ProdID: | 70028249 |
| Citation Author: | Sumner, D. M. |
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| Citation End Page: | 711 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the American Water Resources Association |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Adequacy of selected evapotranspiration approximations for hydrologic simulation; 2006; Article; Journal; Journal of the American Water Resources Association; Sumner, D. M. |
| Citation Start Page: | 699 |
| Citation Volume: | 42 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Adequacy of selected evapotranspiration approximations for hydrologic simulation; 2006; Article; Journal; Journal of the American Water Resources Association; Sumner, D. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1111/j.1752-1688.2006.tb04486.x |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
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