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Developing a reliable model for aquifer vulnerability

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Abstract

The assessment of aquifer vulnerability to pollution is crucial for planning a sound management strategy of groundwater quality protection and farmland fertilizer use. This study establishes a reliable model for aquifer vulnerability assessment with an excellent performance for predicting groundwater nitrate-N contamination in the Choushui River alluvial fan, Taiwan based on the DRASTIC method. To promote the prediction performance of aquifer vulnerability assessment, discriminant analysis (DA) was applied to determine the weights of factors in the DRASTIC model by comparing the model results with the observed nitrate-N data. Key factors influencing the presence of groundwater nitrate-N pollution were characterized for different concentration thresholds. The results of analysis reveal that the modified DRASTIC model using DA significantly improves prediction performance for aquifer vulnerability assessment, and groundwater protection zones can be determined correctly based on the modified DRASTIC index. Furthermore, the sensitivity of the factors in the modified DRASTIC model indicates that the depth to the groundwater and aquifer media are critical when the nitrate-N concentration is less than 3 mg/L, while the impact of the vadose zone plays a vital role in controlling nitrate-N pollution of over 5 mg/L.

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Acknowledgments

The authors would like to thank the Ministry of Science and Technology, Taiwan for financially supporting this research under Contract No. NSC 98-2116-M-242-001.

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Authors and Affiliations

  1. Department of Leisure and Recreation Management, Kainan University, Luzhu, Taoyuan, 338, Taiwan

    Cheng-Shin Jang

  2. Graduate Institute of Applied Geology, National Central University, Jhongli, Taoyuan, 320, Taiwan

    Chien-Wen Lin & Jui-Sheng Chen

  3. Department of Nursing, Fooyin University, Kaohsiung, 831, Taiwan

    Ching-Ping Liang

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  1. Cheng-Shin Jang
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  2. Chien-Wen Lin
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  4. Jui-Sheng Chen
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Correspondence to Jui-Sheng Chen.

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Jang, CS., Lin, CW., Liang, CP. et al. Developing a reliable model for aquifer vulnerability. Stoch Environ Res Risk Assess 30, 175–187 (2016). https://doi.org/10.1007/s00477-015-1063-z

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  • DOI: https://doi.org/10.1007/s00477-015-1063-z

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