TY - JOUR
T1 - Effective visualization for the spatiotemporal trend analysis of the water quality in the Nakdong River of Korea
AU - Lee, Hye Won
AU - Bhang, Kon Joon
AU - Park, Seok Soon
PY - 2010/7
Y1 - 2010/7
N2 - Spatial and temporal trend analyses were performed to obtain more meaningful water quality information in table and three-dimensional graph forms. Using the statistical approaches of the Seasonal Mann-Kendall (SMK) and LOcally WEighted Scatter plot Smoother (LOWESS) methods, the trends of three water quality parameters, including Biochemical Oxygen Demand (BOD), Total Nitrogen (TN), and Total Phosphorus (TP) measured along the Nakdong River of Korea between 1992 and 2002 were analyzed. The trends of the slopes were calculated using the SMK method for two consecutive stations and years. These values are provided in the trend tables which indicate the extreme upward and downward trends. Also, three-dimensional graphs of the water quality in the Nakdong River were generated with respect to the distance from upstream of the river and time of month. From this study, it was concluded that these tables and three-dimensional maps could be used as a useful tool to provide the spatiotemporal trend information such as the hot spots/moments of improvement and deterioration in the water quality of the Nakdong River, with the present web-based information system.
AB - Spatial and temporal trend analyses were performed to obtain more meaningful water quality information in table and three-dimensional graph forms. Using the statistical approaches of the Seasonal Mann-Kendall (SMK) and LOcally WEighted Scatter plot Smoother (LOWESS) methods, the trends of three water quality parameters, including Biochemical Oxygen Demand (BOD), Total Nitrogen (TN), and Total Phosphorus (TP) measured along the Nakdong River of Korea between 1992 and 2002 were analyzed. The trends of the slopes were calculated using the SMK method for two consecutive stations and years. These values are provided in the trend tables which indicate the extreme upward and downward trends. Also, three-dimensional graphs of the water quality in the Nakdong River were generated with respect to the distance from upstream of the river and time of month. From this study, it was concluded that these tables and three-dimensional maps could be used as a useful tool to provide the spatiotemporal trend information such as the hot spots/moments of improvement and deterioration in the water quality of the Nakdong River, with the present web-based information system.
KW - LOcally WEighted Scatter plot Smoother
KW - Seasonal Mann-Kendall
KW - Spatiotemporal trend table
KW - Trend analysis
KW - Visual trend graph
KW - Water quality information system
UR - http://www.scopus.com/inward/record.url?scp=77954757583&partnerID=8YFLogxK
U2 - 10.1016/j.ecoinf.2010.05.004
DO - 10.1016/j.ecoinf.2010.05.004
M3 - Article
AN - SCOPUS:77954757583
SN - 1574-9541
VL - 5
SP - 281
EP - 292
JO - Ecological Informatics
JF - Ecological Informatics
IS - 4
ER -