Evolution of the River Amazon's discharge at Obidos from 1903 to 1999

被引：72

作者：

Callède, J

Guyot, JL

Ronchail, J

L'Hôte, Y

Niel, H

De Oliveira, E

机构：

[1] IRD, BR-71050191 Brasilia, DF, Brazil

[2] Univ Toulouse 3, LMTG, IRD, F-31400 Toulouse, France

[3] IRD, BR-71619970 Brasilia, DF, Brazil

[4] IRD Maison Sci Eau, F-34394 Montpellier 5, France

[5] ANA, Setor Policial, BR-70610200 Brasilia, DF, Brazil

来源：

HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES | 2004年 / 49卷 / 01期

关键词：

statistical analysis; discharge; rainfall; deforestation; River Amazon;

D O I：

10.1623/hysj.49.1.85.53992

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

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.

引用

页码：85 / 97

页数：13