Comparison of precise water depth measurements on agricultural storages with open-water evaporation estimates
Article
Article Title | Comparison of precise water depth measurements on agricultural storages with open-water evaporation estimates |
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ERA Journal ID | 5245 |
Article Category | Article |
Authors | |
Author | Craig, I. P. |
Journal Title | Agricultural Water Management |
Journal Citation | 85 (1-2), pp. 193-200 |
Number of Pages | 10 |
Year | 2006 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0378-3774 |
1873-2283 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.agwat.2006.04.010 |
Web Address (URL) | http://www.sciencedirect.com/science/journal/03783774 |
Abstract | [Abstract]: A simple technique to determine evaporation and seepage losses of agricultural water storages is described. Evaporation is calculated from Automatic Weather Station (AWS) variables using the Penman-Monteith equation, and seepage is determined as the difference between this and accurate water depth measurements made using a Pressure Sensitive Transducer (PST). The accuracy of the PST devices (1mm) was far greater than any flow metering equipment available, so analysis only took place when there was no pumping in and out of the dam. Calibration tests were carried out during the summer of 2004/5 at a dam site where seepage was very close to zero, as total evaporation plus seepage loss over the winter months there was independently determined to be less than 1mm/day . Summertime PST depth traces were compared to the Penman 1948 equation, Penman-Monteith (PM) ETo calculated according to the FAO56 method and Penman-Monteith (PM) with surface resistance set to zero to simulate a open water surface. The first two produced the best correlations (within 10% agreement with the water depth trace), but PM open water over predicted by 40%. This technique has provided a useful tool to more accurately apportion total water loss into evaporation and seepage components. Similar to the evapotranspiration of different crop types, it is suggested that that the evaporation of open water can be similarly related to the international standard FAO56 PM via a simple dam factor. |
Keywords | evaporation, Penman Monteith, pressure sensitive transducer, seepage |
ANZSRC Field of Research 2020 | 401999. Resources engineering and extractive metallurgy not elsewhere classified |
400513. Water resources engineering | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | National Centre for Engineering in Agriculture |
https://research.usq.edu.au/item/9xwq8/comparison-of-precise-water-depth-measurements-on-agricultural-storages-with-open-water-evaporation-estimates
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