In: Journal of Hydrology and Hydromechanics, vol. 66, no. 2
Marcia S. Batalha - Maria C. Barbosa - Boris Faybishenko - Martinus Th. Van Genuchten
Detaily:
Rok, strany: 2018, 143 - 152
Kľúčové slová:
Groundwater recharge; Meteorological data; Temporal averaging; HYDRUS-1D; Infiltration; Evaporation.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Accurate estimates of infiltration and groundwater recharge are critical for many hydrologic, agricultural and
environmental applications. Anticipated climate change in many regions of the world, especially in tropical areas, is expected
to increase the frequency of high-intensity, short-duration precipitation events, which in turn will affect the
groundwater recharge rate. Estimates of recharge are often obtained using monthly or even annually averaged meteorological
time series data. In this study we employed the HYDRUS-1D software package to assess the sensitivity of
groundwater recharge calculations to using meteorological time series of different temporal resolutions (i.e., hourly, daily,
weekly, monthly and yearly averaged precipitation and potential evaporation rates). Calculations were applied to
three sites in Brazil having different climatological conditions: a tropical savanna (the Cerrado), a humid subtropical area
(the temperate southern part of Brazil), and a very wet tropical area (Amazonia). To simplify our current analysis, we did
not consider any land use effects by ignoring root water uptake. Temporal averaging of meteorological data was found to
lead to significant bias in predictions of groundwater recharge, with much greater estimated recharge rates in case of very
uneven temporal rainfall distributions during the year involving distinct wet and dry seasons. For example, at the Cerrado
site, using daily averaged data produced recharge rates of up to 9 times greater than using yearly averaged data. In all
cases, an increase in the time of averaging of meteorological data led to lower estimates of groundwater recharge, especially
at sites having coarse-textured soils. Our results show that temporal averaging limits the ability of simulations to
predict deep penetration of moisture in response to precipitation, so that water remains in the upper part of the vadose
zone subject to upward flow and evaporation.
Ako citovať:
ISO 690:
Batalha, M., Barbosa, M., Faybishenko, B., Van Genuchten, M. 2018. Effect of temporal averaging of meteorological data on predictions
of groundwater recharge. In Journal of Hydrology and Hydromechanics, vol. 66, no.2, pp. 143-152. 0042-790X (until 2019) .
APA:
Batalha, M., Barbosa, M., Faybishenko, B., Van Genuchten, M. (2018). Effect of temporal averaging of meteorological data on predictions
of groundwater recharge. Journal of Hydrology and Hydromechanics, 66(2), 143-152. 0042-790X (until 2019) .