1 Laboratory for Applied Geology and Hydrogeology, Department of Geology, Ghent University, 9000 Gent, Belgium
2 Department of Geology, School of Earth Sciences, Mekelle University, Mekelle 231, Ethiopia
3 Department of Civil Engineering and Disaster Prevention and Water Environment Research Center, National Yang-Ming Chiao Tung University, 1001 University Rd., Hsinchu 300, Taiwan
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