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Environmental Monitoring and Assessment

, Volume 185, Issue 12, pp 10147–10156 | Cite as

Probability-based nitrate contamination map of groundwater in Kinmen

  • Chen-Wuing Liu
  • Yeuh-Bin Wang
  • Cheng-Shin Jang
Article

Abstract

Groundwater supplies over 50 % of drinking water in Kinmen. Approximately 16.8 % of groundwater samples in Kinmen exceed the drinking water quality standard (DWQS) of NO3 -N (10 mg/L). The residents drinking high nitrate-polluted groundwater pose a potential risk to health. To formulate effective water quality management plan and assure a safe drinking water in Kinmen, the detailed spatial distribution of nitrate–N in groundwater is a prerequisite. The aim of this study is to develop an efficient scheme for evaluating spatial distribution of nitrate–N in residential well water using logistic regression (LR) model. A probability-based nitrate–N contamination map in Kinmen is constructed. The LR model predicted the binary occurrence probability of groundwater nitrate–N concentrations exceeding DWQS by simple measurement variables as independent variables, including sampling season, soil type, water table depth, pH, EC, DO, and Eh. The analyzed results reveal that three statistically significant explanatory variables, soil type, pH, and EC, are selected for the forward stepwise LR analysis. The total ratio of correct classification reaches 92.7 %. The highest probability of nitrate–N contamination map presents in the central zone, indicating that groundwater in the central zone should not be used for drinking purposes. Furthermore, a handy EC–pH-probability curve of nitrate–N exceeding the threshold of DWQS was developed. This curve can be used for preliminary screening of nitrate–N contamination in Kinmen groundwater. This study recommended that the local agency should implement the best management practice strategies to control nonpoint nitrogen sources and carry out a systematic monitoring of groundwater quality in residential wells of the high nitrate–N contamination zones.

Keywords

Logistic regression Nitrate contamination map Groundwater quality Zonal management 

Notes

Acknowledgment

The authors would like to thank the Soil and Groundwater Remediation Fund Management Board of the Environmental Protection Administration (EPA) in Taiwan and Environmental Protection Bureau (EPB) of Kinmen County for the data provided for Kinmen Island.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Chen-Wuing Liu
    • 1
  • Yeuh-Bin Wang
    • 1
  • Cheng-Shin Jang
    • 2
  1. 1.Department of Bioenvironmental Systems EngineeringNational Taiwan UniversityTaipeiRepublic of China
  2. 2.Department of Leisure and Recreation ManagementKainan UniversityTaoyuanRepublic of China

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