Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.jhydrol.2024.132530 |
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| Title (Primary) | Rethinking evaporation measurement and modelling from inland waters − A discussion of the challenges to determine the actual values on the example of a shallow lowland reservoir |
| Author | Spank, U.; Koschorreck, M.; Aurich, P.; Sanchez Higuera, A.M.; Raabe, A.; Holstein, P.; Bernhofer, C.; Mauder, M. |
| Source Titel | Journal of Hydrology |
| Year | 2025 |
| Department | SEEFO |
| Volume | 651 |
| Page From | art. 132530 |
| Language | englisch |
| Topic | T5 Future Landscapes T4 Coastal System |
| Keywords | Bulk approach; Dalton number; Eddy covariance; Lakes and reservoirs; Measurement errors; Uncertainty analysis |
| Abstract | The evaporation from a Central European lowland reservoir was observed for four years from spring to early winter utilizing a floating outdoor laboratory equipped with an eddy-covariance measuring system. The applied floating observation system made it possible to monitor the evaporation process far away from shore, which reduces impacts of advection and other inferences from the terrestrial surroundings. The measured data therefore reflect the pure nature of the water-atmosphere-interaction that takes place over an extensive large open water surface. The daily evaporation rates were only half to two-thirds of the FAO grass-reference evapotranspiration, which is in conflict with many textbooks those equate the evaporation of open water surfaces with the potential evaporation, which is even higher than the FAO grass-reference evapotranspiration. Measurement uncertainties and in particular the energy-balance-closure-gap in the eddy-covariance data cannot explain this discrepancy. On the contrary, much lower evaporation rates need to be assumed for open-water surfaces. Before this background, different model approaches were reviewed and a modified Dalton approach was selected for accompanying model investigations. Several parameterizations found in the scientific literature were tested together with parameterizations derived from station data. The suitability of the Dalton approach in general and the parameter sets used were evaluated against the background of unavoidable measurement uncertainties and measurement tolerances in both the input data and the reference data. The different parameterizations of the model approach resulted in significantly varying modelling qualities and performances. At the same time, however, it was also shown that the effects of seemingly insignificant measurement uncertainties in the input data accumulate to considerable amounts, leading to significant uncertainties that must be considered in water balance investigations and issues of water resource management in order to avoid misjudgements. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=30123 |
| Spank, U., Koschorreck, M., Aurich, P., Sanchez Higuera, A.M., Raabe, A., Holstein, P., Bernhofer, C., Mauder, M. (2025): Rethinking evaporation measurement and modelling from inland waters − A discussion of the challenges to determine the actual values on the example of a shallow lowland reservoir J. Hydrol. 651 , art. 132530 10.1016/j.jhydrol.2024.132530 |
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