Short-term Variations of Electrical Conductivity and Major Anions in Streamwater during the Storm Events in Rehabilitated Catchments

摘要

To understand the chemical changes in the Streamwater during the storm event, we analyzed EC, Cl~-, NO_3~-, and SO_4~(2-) in Yangju No. 2 catchment, which were collected three times by using a auto-sampler (6712FR, ISCO) in 2003. The El (April, 29, 2003), which were 70mm anticipant precipitation, showed slack change of stream discharge and EC as compare to E2(anticipant precipitation 2.5mm; May, 30, 2003) and E3(anticipant precipitation 41mm; July, 18, 2003). It was assumed that these phenomena weredue to contribution of base flow recharged by much anticipant precipitant. Moreover, NO_3~- concentrations in El were higher than others, and these results may have resulted from biological absorbance ability. The concentrations of Cl~- and SO_4~(2-) decreased with elapsed time after storm events. It is reasonable to consider that meteorology, biology, geomorphology, and geochemistry are important to understanding for mechanism of Streamwater chemistry.