Scholarly record
GEOCHEMICAL STUDY ON AN ALLUVIAL AQUIFER SYSTEM OF THE NAKDONG RIVER BASIN FOR RIVER BANK FILTRATION IN KOREA
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 ($\delta$18O, $\delta$D, tritium, $\delta$34S, $\delta$15N 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.
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References11
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ACKNOLEDGEMENT This research was supported by Nuclear R&D Program by MOST and a grant (3-
1) from Susta inable Water Resour ces Research Center of the 21 st Century Frontier Research Program. Corresponding author: Geon-Young Kim, Korea Atomic Energy Research Institute (KAERI), 150 Duckjindong, Yuseon-gu, Daejeon, Korea, 305-353 4th International Multidisciplinary Scientific GeoConference SGEM2004 www.sgem.org 344 Haman Fm. Alluvium & Talus Basic dyke Silla conglomerate Fm. Chilgok Fm. Jinju Fm. Hasandong Fm. Nakdong Fm. LEGEND unconformaity Intrusion Nogokri Nakdong River
2.5km DB-1 SB-6 BH-2 DB-3 DB-2 SB-5 BH-2 DW-1 SB-4 SB-1 SW-1 S-2 Study Area SW-2 MP(SB-10)SB-9 SW-1-1,5 DW-1-1,2,3,5,6 S-1 SB-11 SB-12 Dalseong-gun Koryeong-gun Sampling site Fig. 1. Geologic map of the study area. Sampling locations are also shown. 4th International Multidisciplinary Scientific GeoConference SGEM2004 www.sgem.org
0 SB-9 SW-2 SB-10, with Multi-Packer System SB-11 SB-12 SAND GRAVEL WEATHERED ROCK Pumping Well S-1 (River) Fig. 2. Profile of t he experimental site. +Na Cl2+ Ca2+ Mg2+ HCO SO2-4 - +
MP Groundwater Shallow Groundwater Surface Water +Na Cl2+ Ca2+ Mg2+ HCO SO2-4 - +
MP-6m MP-13.5m MP-18m Fig. 3. Piper’s dia grams for the water samples from the study area. International Conference
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