Environ Geol (2005). DOI: 10.1007/s00254-005-0109-9

The corresponding author Nguyen Cao Don currently belongs to:

Institute of Lowland Technology, Saga University, Honjo 1, Saga-shi, Saga 840-8502, Japan

e-mail: don@ilt.saga-u.ac.jp

Tel.: +81-952-288571

Fax: +81-952-288571

and previously worked for:

Hydraulic Engineering Consultants I (HEC-1), Dong Da, Hanoi, Vietnam.