DBPapers

GEOCHEMICAL STUDY ON AN ALLUVIAL AQUIFER SYSTEM OF THE NAKDONG RIVER BASIN FOR RIVER BANK FILTRATION IN KOREA

AUTHOR/S: KIM, G. Y., KOH, Y. K., KIM, CH., BAE, D. S., KIM, H.S.
Sunday 1 August 2010 by Libadmin2004

4th International Scientific Conference - SGEM2004, www.sgem.org, SGEM2004 Conference Proceedings/ ISBN: 954-918181-2, June 14-18, 2004, 339- 346pp

ABSTRACT

As a part of the national project for the development of sustainable water resources, the
geochemical studies on an alluvial aquifer system developed in the vicinity of the Nakdong
River were carried out for the feasibility study of river bank filtration in Korea. Through the
river bank filtration, we intend to secure the sustainable water resources by increasing river
water quality polluted from industrialization and preventing an excessive groundwater
extraction from alluvial aquifer with defining the most optimum pumping rate. Chemical and
isotope (δ18O, δD, tritium, δ34S, δ15N and 87Sr/86Sr) data of the water infiltrated through river
bank suggest that the surface water and groundwater are well mixed with each other
throughout the study area. In the borehole installed with a multi-packer system, pH and EC
values and Na, Ca, Mg and HCO3 contents of the groundwater are increased with depth.
Especially, SO4 and Cl contents show the lowest values at the basement rock section (18m
depth) and NO3 and Mn contents are the highest values in sand (6m depth) and gravel (13.5m
depth) layers, respectively. Seasonal and spatial variations in geochemical data between the
pumping well and the Nakdong River are not clearly discernible. This fact suggests that the
alluvial aquifer system consists of a single groundwater system. Thus the effect of test
pumping rate for the river bank filtration could not clearly be detected in the flow system of
the alluvial aquifer.

Keywords: river bank filtration, alluvial aquifer, isotope, Nakdong River, groundwater
system