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Nordic Hydrology,
12, 1981, 207-216
No part may be reproduced by any process without complete reference
Evapotranspiration at Two Mountain Sites
During the Vegetation Period
M. Staudinger and H. Rott
University of Innsbruck, Innsbruck, Austria
Hourly values of evapotranspiration
(ET)
for the months July to September
1976 and 1977 were calculated from energy balance measurements at two test
sites near the village of Obergurgl in the Austrian Alps. One test site was
situated at 1,960 m a.s.l. on a cultivated meadow near the timberline, the
other test site at 2,580 m a.s.l. was covered with alpine sedges and grasses.
Examples of the daily variations and daily sums of the energy fluxes are
presented for clear and cloudy days. The mean daily courses of
ET
at the two
test sites are shown for every month of the measurement periods; differences
in
ET
between the two test sites are related to the decrease of transpirating
leaf areas with altitude. Monthly sums of
ET
are presented in relation to net
radiation and precipitation; on the average ET was about 30% lower at the
higher elevated site. High correlations were found between the daily sums of
net radiation and of
ET
at both sites. This relation can be used for calculating
ET
from radiation measurements.
Introduction
The components of the surface energy balance and other meteorological parame-
ters were measured at two test sites in the Austrian Alps in the months July,
August, and September of the years 1976 to 1978. These measurements were a
contribution to the Man and Biosphere (MaB) Project No. 6, Working Group
Obergurgl (Moser 1977), which investigated ecological Systems in the mountain
region near the village of Obergurgl (1.930 m a.s.l., 11°2' E, 46°28 N) in the
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