Short-term hydroclimatic impacts on the hydrodynamic pattern of the Amazon Estuary River, Amapá (AP), Brazil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.001.0014Keywords:
El Niño phenomenon, Paired statistical analysis, Hydrodynamic series, Hydric balanceAbstract
The objective of the work was to analyze the rainfall pattern, the flow and the level of semidiurnal tides in the Matapi River Basin in 2015, when the most intense El Niño phenomenon of the last 100 years occurred. For that, the rainfall indices of the basin area were quantified, the flow in a section of the spring was monitored with an Accustic Doppler Profiller and the variation of the water column level with a pressure sensor during complete cycles of semidiurn tides occurred in the months of april, june, september, october and december/2015. The climatic data were statistically tested for the 1961-2010 precipitation time series as well as compared with those in the literature. These results confirmed 2015 as a climatologically atypical year, promoting significantly reduced net discharges compared to the available series (Friedman: α<0.05). Specifically, the hydrodynamic pattern was represented by well correlated hysteresis curves (0.76≤R2≤0.82) that indicate the difference between flood and tidal flow behavior. It is concluded that the variation in precipitation resulted from the influence of the El Niño phenomenon on the hydrodynamic pattern of the Matapi 2015 river (p<0.05), being of relevant scientific interest its monitoring for water management purposes, especially in times of global warming.
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