Evolution of the River Amazon's discharge at Obidos from 1903 to 1999
Evolution of the River Amazon's discharge at Obidos from 1903 to 1999
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DOI：
10.1623/hysj.49.1.85.53992
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发表时间：
2004-02-01
期刊：
影响因子：
--
通讯作者：
De Oliveira, E
中科院分区：
文献类型：
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作者：
Callède, J;Guyot, JL;De Oliveira, E
对奥比多斯河97年观测或重建的年径流量时间序列显示，1903 - 1999年，亚马逊河的年平均径流量略微增加了9%，洪水增加了10%。所有的破裂试验都表明，年平均流量和洪水在1970年发生了破裂。变异系数的演变表明，从1927年到1970年，平均流量和洪水的年际变率减小了。对比1945 - 1998年流域年平均流量与年平均降雨量的变化，发现降水与径流具有较好的相关性。最后，对年平均流量和年平均降雨量演变的分析表明，与降雨量有关的流量增加了，这可能是亚马逊森林砍伐的结果。年平均流量和年平均降雨量以与1945年至1998年平均值的偏差的百分比表示。
The time series of 97 annual values, observed or reconstituted, of runoff of the River Amazon at Obidos shows a slight increase of 9% in the mean annual discharges from 1903 to 1999, and of 10% for the floods. All the rupture tests indicate a break in 1970, for the mean annual discharges as well as for the floods. The evolution of the coefficients of variation indicates a reduction in the interannual variability of the mean discharges and floods, from 1927 to 1970. The comparison between the evolution of the mean annual discharges and the average annual rainfall of the basin, from 1945 to 1998, exhibits a good correlation between precipitation and runoff. Finally, the analysis of the evolution of the mean annual discharge and the average annual rainfall, expressed as a percentage of the deviation from the 19451998 averages, demonstrates an increase in the flow in relation to the rainfall, which could be the consequence of the Amazonian deforestation.