준 폐수로로 유입되는 점착성 퇴적물의 침강속도 산정을 위한 실험적 연구
A Laboratory Study for Settling Velocities of Cohesive Sediments Entering in Semi-closed Channel
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초록
본 연구에서는 침/퇴적특성 예측/평가를 위한 기초자료 확보를 목적으로 대표적인 준 폐수로인 경인 아라뱃길 주운수로와 연결된 3개 수역(인천해역, 굴포천, 한강수역)에서의 점착성 퇴적물 각각에 대한 침강속도가 실내실험을 통하여 정량적으로 산정되었다. 침강속도 측정결과, 전체적인 농도구간(0.1 < C < 90 g/L)에 걸쳐 굴포천(0.01 < Ws<3.07 mm/s)과 한강수역(0.01 < Ws< 2.97 mm/s) 하상의 점착성 퇴적물은 대체적으로 거의 유사한 크기의침강속도 분포를 갖는 것으로 나타났으나, 인천해역 표층 점착성 퇴적물은 이들과는 크게 다른 침강속도(0.01 < Ws< 0.92 mm/s) 분포를 갖는 것으로 나타났다. 한편, 각 수역별 퇴적물의 물리화학적 특성 및 해수(혹은 담수)의 특성들의 비교/분석 결과에 따르면, 이러한 인천해역 점착성 퇴적물의 침강속도 분포의 상이함은 주로 유체의 염도 차에 의해 비롯된 것으로 추정되었다.
Abstract
This study aims to estimate settling velocity (Ws) for cohesive sediments from water bodies (IncheonCoast, Kulpo Stream and Han River) mainly connected to the Kyeongin Ara-waterway through the laboratorysettling experiments. Results of settling tests for these sediments show that Ws values for sediments are quitedifferent each other: Ws values of Kulpo Stream sediments (0.01 < Ws < 3.07 mm/s) are quite similar with those ofHan River sediments (0.01 < Ws < 2.97 mm/s) over the whole range of suspension concentration C (0.1 < C < 90 g/L), while they are quite different with those for Incheon Coast sediments (0.01 < Ws <0.92 mm/s). Qualitativeanalyses on test results for physico- chemical properties of sediments and waters with respect to settling velocitiesshow that these differences in settling velocities are mainly due to the salinity difference in the water.
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