Measuring evapotranspiration by hydrological methods (Record no. 51433)

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control field 20250625160207.0
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-17270
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Title Measuring evapotranspiration by hydrological methods
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Volume/sequential designation Developments in Agricultural and Managed Forest Ecology, 13, p.29-40, 1984
520 3# - SUMMARY, ETC.
Summary, etc. The measurement of evapotranspiration using the methods of micrometeorology requires a sophisticated application of advanced technology. The simpler alternatives, though they are not always less costly, are discussed, namely (1)precipitation-minus-stream discharge, (2)estimates of the changes of the water storages, either in the water table aquifer or in the unsaturated zone of the soil, (3)lysimeters, and (4)material balance methods. The accuracies attainable by these methods vary. The most precise estimate can be got from a well-designed, weighable lysimeter, but the representativeness of the exposure is always a worry for the experimenter. The least precise estimate, on a month-to-month basis, is afforded by the precipitation-minusstream discharge method, but this method can give a good estimate of annual total evapotranspiration. The range of evapotranspiration rates probably spans 0.7 mm d-1 in mid-winter, on occasions, to 5 mm d-1 in late spring if the season is a wet one. For reasonable definition of these rates on a daily basis, we are looking for a method that is accurate to ±0.2 mm d-1. Only the weighing lysimeter can achieve this. The other methods variously provide mean rates for periods of five days or longer.
650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name entry element EVAPOTRANSPIRATION
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Holmes, J. W.
856 40 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="https://drive.google.com/file/d/1p63VDAlnmWojO8cK6OSKyZrwIe3HeCo3/view?usp=drivesdk">https://drive.google.com/file/d/1p63VDAlnmWojO8cK6OSKyZrwIe3HeCo3/view?usp=drivesdk</a>
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