Estimating Nonpoint Source Pollution in the Upper Yangtze River Using the Export Coefficient Model, Remote Sensing, and Geographical Information System
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 9
Abstract
Recently, increasing nutrient (i.e., nitrogen and phosphorus) concentrations have been observed in the surface water of many countries and this nonpoint source (NPS) pollution has become an important factor in the deterioration of water quality in the upper reach of the Yangtze River Basin. In this paper, the NPS pollution loads in the upper reach of Yangtze River Basin in the year 2000 were estimated using export coefficient model and remote sensing techniques. The spatial distributions of the NPS loads within the watershed were then displayed using geographical information system. Results indicated that the total nitrogen load was and the total phosphorus load was . Important source areas for the nutrients were croplands in the Jinsha R. and Jialing R. watershed, as well as the Chongqing municipality.
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Acknowledgments
This project was granted financial support from the major state basic research program of China (973) (Grant No. UNSPECIFIED2003CB415204).
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© 2009 ASCE.
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Received: Jul 7, 2006
Accepted: Apr 24, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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