NDLI: Spatiotemporal trend analysis of recent river water quality conditions in Japan.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Luo, Pingping He, Bin Takara, Kaoru Razafindrabe, Bam H. N. Nover, Daniel Yamashiki, Yosuke
Spatial Coverage	Japan
Description	Country affiliation: Japan Author Affiliation: Luo P ( Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Japan. robertluoping@flood.dpri.kyoto-u.ac.jp)
Abstract	In order to promote pollutant monitoring and preservation of water resources, we evaluate the spatiotemporal trends in recent water quality conditions in Japanese rivers. Trend analysis is conducted on the 92 major rivers in Japan using the available water quality data recorded from 1992 to 2005 and the characteristics of major pollutants in these rivers are analyzed. Spatial and temporal analysis of trends for six water quality indicators is conducted using the Mann Kendall test, a non-parametric statistical method. The indicators analyzed are biochemical oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen (DO), total nitrogen (TN), total phosphorus (TP) and pH. The majority of sampling locations monitoring BOD, COD, TN and TP show trends toward decreasing concentrations over time. Many sampling locations show increasing DO concentrations. Our results show that water quality in Japanese rivers has improved dramatically over the past decade, although there are still problems in some places, most notably in the Hokkaido, Kanto, Kinki and Kyushu regions. The improvements seen in water quality appear to be the result of improved wastewater treatment and other water quality improvement efforts achieved through government initiative.
File Format	HTM / HTML
ISSN	14640325
Issue Number	10
Volume Number	13
e-ISSN	14640333
Journal	Journal of Environmental Monitoring
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-10-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Environmental Health Water Pollution, Chemical Statistics & Numerical Data Water Quality Standards Biological Oxygen Demand Analysis Japan Nitrogen Analysis Oxygen Phosphorus Water Pollutants, Chemical Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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