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Title: The water balance of an Amazonian micro-catchment: The effect of interannual variability of rainfall on hydrological behaviour
Authors: Tomasella, J.
Hodnett, Martin G.
Cuartas, Luz Adriana
Nobre, Antônio Donato
Waterloo, M. J.
Oliveira, Sylvia Mota de
Keywords: Groundwater
Amazon Basin
Ground Water Systems
Interannual Variability (iav)
Meteorological Data
Runoff Generation
Spatial Scaling
Tropical Systems
Water Balances
Water Budgets
Annual Variation
Basin Analysis
Hydrological Response
Rainfall-runoff Modeling
River Basin
Vadose Zone
Water Budget
Water Storage
Amazon Basin
South America
Issue Date: 2008
metadata.dc.publisher.journal: Hydrological Processes
metadata.dc.relation.ispartof: Volume 22, Número 13, Pags. 2133-2147
Abstract: In humid tropical systems, the large intraseasonal and interannual variability of rainfall can significantly affect all components of the water balance. This variability and the lack of detailed hydrological and meteorological data in both temporal and spatial scales have created uncertainties regarding the closure of the water balance for the Amazon basin. Previous studies in Amazonian micro-catchments suggested that both the unsaturated and groundwater system, which are not taken into consideration in basin-wide water budgets published in the literature, play an important role in controlling the timing of runoff generation. In this paper, the components of the water balance and the variations in different storages within the system were examined using 3 years' data from a 6.58 km2 micro-catchment in central Amazonia. The role and relative importance of the various stores were examined. The results show a strong memory effect in the groundwater system that carries over seasonal climate anomalies from one year to the next and affects the hydrological response well beyond the time span of the anomaly. In addition, the deep unsaturated zone was found to play a key role in reducing most of the intraseasonal variability and also affected the groundwater recharge. This memory effect is crucial for sustaining streamflow and evaporation in years with rainfall deficiency. The memory effect caused by storage in the groundwater and unsaturated systems may also prevent the closure of annual large-scale water balances, which assume that storage returns to a standard state each year. Copyright © 2007 John Wiley & Sons, Ltd.
metadata.dc.identifier.doi: 10.1002/hyp.6813
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