Spatial and temporal water quality variability in the Piracicaba river basin, Brazil

被引：24
|
作者：
Krusche, AV [1 ]
deCarvalho, FP [1 ]
deMoraes, JM [1 ]
deCamargo, PB [1 ]
Ballester, MVR [1 ]
Hornink, S [1 ]
Martinelli, LA [1 ]
Victoria, RL [1 ]
机构：
[1] CETESB,BR-13400183 PIRACICABA,SP,BRAZIL
来源：
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION | 1997年 / 33卷 / 05期
关键词：
trend analysis; time series; water quality; river basin; Piracicaba River Basin; Brazil;
D O I：
10.1111/j.1752-1688.1997.tb04129.x
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The spatial and temporal variability of dissolved oxygen (DO), biochemical oxygen demand (BOD), nitrate concentration and total coliform (TC) were investigated at nine sampling stations distributed along the main rivers of the Piracicaba River Basin, a 12,400 km(2) catchment located in Sao Paulo State, one of the most developed regions of Brazil. Spatially, a downstream impoverishment of water quality conditions was observed, as seen by the decrease of DO, and increase of BOD, nitrate, and TC. These changes were probably caused by accumulating downstream discharge of domestic and industrial sewage. Temporal evaluation of 18 years of data showed that DO decreased with time for the majority of the sampling stations, while BOD, nitrate, and TC increased. A law, approved at the end of 1991, proposed a new water tax for river water extraction for industrial and agricultural use. The amount of this tax is determined according to the water quality of the extracted water. Therefore, the evaluation of the water quality status in this basin is a first step to help resources managers to determine the values for this tax.
引用
收藏
页码：1117 / 1123
页数：7
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