Chapter 14
Assessment of Some Diurnal
Streamwater Profiles in Western
and Northern Romania in Relation
to Meteorological Data
Andrei-Emil Briciu, Dinu Iulian Oprea, Dumitru Mih˘ ail˘ a,
Liliana Gina Lazurca (Andrei), Luciana-Alexandra Costan (Briciu)
and Petrut , -Ionel Bistricean
Abstract Water and air measurements were conducted in river valleys of Romania to detect the shapes of diurnal profiles and their spatial variations. The studied
river water parameters are pressure/level, temperature, and electrical conductivity.
The air parameters, used for understanding the diurnal water profiles are pressure,
temperature and relative humidity. Time intervals used in this study vary from few
weeks to few months and sites are grouped depending on common time intervals
for comparison purposes. The selected water monitoring sites have similar diurnal
shapes of the studied parameters in areas with the natural flow (afternoon maximum water level and temperature and minimum electrical conductivity; the opposite
events occur early in the morning) and disturbed evolutions in areas where dams
and hydroelectric plants exist. The natural particular monitoring sites characteristics
can also significantly impact the results of measurements. The mean diurnal water
profiles, obtained from detrended time series, can be used for theoretical models.
Keywords Natural flow · Human impact · Thermal water input · Detrending
14.1 Introduction
Rivers are a very dynamic part of the hydrosphere. They have many oscillations (of
their discharge/level and other parameters) caused by the Earth revolution (that generates the annual cycle with its spatio-temporal variations), climate teleconnections
and actual climate changes. However, beyond these well-known variations, rivers
also show a cyclic diurnal evolution that partly overwrites every major trendline.
A.-E. Briciu (B) · D. I. Oprea · D. Mih˘ ail˘ a · L. G. Lazurca (Andrei) · L.-A. Costan (Briciu)
Department of Geography, S , tefan cel Mare University of Suceava (USV), Suceava, Romania
e-mail: andreibriciu@atlas.usv.ro
P.-I. Bistricean
Suceava Weather Station, National Meteorological Administration (ANM), Suceava, Romania
© Springer Nature Switzerland AG 2020
A. M. Negm et al. (eds.), Water Resources Management in Romania, Springer Water,
https://doi.org/10.1007/978-3-030-22320-5_14
465
Assessment of Some Diurnal
Streamwater Profiles in Western
and Northern Romania in Relation
to Meteorological Data
Andrei-Emil Briciu, Dinu Iulian Oprea, Dumitru Mih˘ ail˘ a,
Liliana Gina Lazurca (Andrei), Luciana-Alexandra Costan (Briciu)
and Petrut , -Ionel Bistricean
Abstract Water and air measurements were conducted in river valleys of Romania to detect the shapes of diurnal profiles and their spatial variations. The studied
river water parameters are pressure/level, temperature, and electrical conductivity.
The air parameters, used for understanding the diurnal water profiles are pressure,
temperature and relative humidity. Time intervals used in this study vary from few
weeks to few months and sites are grouped depending on common time intervals
for comparison purposes. The selected water monitoring sites have similar diurnal
shapes of the studied parameters in areas with the natural flow (afternoon maximum water level and temperature and minimum electrical conductivity; the opposite
events occur early in the morning) and disturbed evolutions in areas where dams
and hydroelectric plants exist. The natural particular monitoring sites characteristics
can also significantly impact the results of measurements. The mean diurnal water
profiles, obtained from detrended time series, can be used for theoretical models.
Keywords Natural flow · Human impact · Thermal water input · Detrending
14.1 Introduction
Rivers are a very dynamic part of the hydrosphere. They have many oscillations (of
their discharge/level and other parameters) caused by the Earth revolution (that generates the annual cycle with its spatio-temporal variations), climate teleconnections
and actual climate changes. However, beyond these well-known variations, rivers
also show a cyclic diurnal evolution that partly overwrites every major trendline.
A.-E. Briciu (B) · D. I. Oprea · D. Mih˘ ail˘ a · L. G. Lazurca (Andrei) · L.-A. Costan (Briciu)
Department of Geography, S , tefan cel Mare University of Suceava (USV), Suceava, Romania
e-mail: andreibriciu@atlas.usv.ro
P.-I. Bistricean
Suceava Weather Station, National Meteorological Administration (ANM), Suceava, Romania
© Springer Nature Switzerland AG 2020
A. M. Negm et al. (eds.), Water Resources Management in Romania, Springer Water,
https://doi.org/10.1007/978-3-030-22320-5_14
465