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Journal of the Korean Society of Hazard Mitigation 2006;6(1):83-95.
Published online March 31, 2006.
ASM-IV를 이용한 부유사농도 연직분포의 측정
이종석, 맹봉재, 차영기
Measurements of Vertical Profiles in Suspended-Load Concentration Using the ASM-IV
Jong-Seok Lee, Bong-Jae Myeng, Young-Kee Cha
Abstract
This study aims to analysis of suspended-load concentration in related to those data by measuring vertical sediments distribution with rainfall using the ASM (Argus Surface Meter)- IV at the channel reach of a upstream and a downstream in small river. The watershed, small river basin where had taken for experimental study was selected, which is a drainage area lied at Walha in Yunkee-Gun, Chungnam Province. Measured data of suspended-load concentration consists of two groups with 2,145 data during 1hr 11min 30sec and 1,216 data during 40min 32sec for measuring time of 2 second in the study reaches at river, respectively. In order to analyze of the vertical concentration distribution, using the data sets are selected the measuring time 16 sets one of these data by random in the study reaches. As a results, the Rouse number of a measured and a calculated value show that a rang of $0.00129{sim}0.02394$, averaged value of 0.01129 md, a rang of $0.00118{sim}0.00822$, averaged value of 0.00436 in upstream reaches, and also a rang of $0.065115{sim}0.065295$, averaged value of 0.06521, and a rang of $0.057315{sim}0.059109$, averaged value of 0.05795 in downstream reaches, respectively. These difference show that measured Rouse number compared with downstream reach errors of less than in upstream reach, but between measured and calculated of the Rouse number compared with downstream reach errors of more than in upstream reach, respectively. It seems to will be included one of the occurrence errors of variable estimations when Rouse number of calculated value to be made computed by the fall velocity with a high temperature of water using equation of empirical kinematic viscosity was derived in this study.
Key Words: ASM(Argus Surface Meter)-IV; suspended-load concentration profiles; Rouse number equation of empirical kinematic viscosity; fall velocity
요지
본 연구는 강우시 소하천 수로구간에서 유사농도의 연직분포를 유사량 측정기 (ASM-IV)로 실측하여 그 특성을 분석하고자 한다. 이를 위해 충남 연기군 서면에 위치한 월하천 시점부분의 수로구간을 연구대상으로 선정하였다. 실측된 부유사농도의 분석자료는 상하류구간에서 각각 1시간 11분 30초 및 40분 32초 동안에 2초 간격으로 측정된 2,145개 및 1,216개중 16개씩의 시간구간 자료가 사용되었다. 분석한 결과, 상류구간의 실측치 Rouse 수는 $0.00129{sim}0.02394$로 분포하고, 평균값은 0.01129로 나타났으며, 하류구간에서는 $0.00118{sim}0.00822$, 평균값은 0.00436으로 하류의 값이 상류의 값보다는 훨씬 작게 분포하는 것으로 나타났다. 계산치 Rouse 수는 상류구간의 경우 $0.065115{sim}0.065295$, 평균값은 0.06521로 나타났고, 하류구간의 경우에는 $0.057315{sim}0.059109$, 평균값은 0.05795로 하류구간이 상류구간보다 약간 작은 값을 갖으나, 실측치 비교에서의 차이보다는 적게 나타났다. 그러나 실측치와 계산치의 비교에서는 상류구간보다 하류구간에서 더 큰 차이를 갖는 것으로 나타났는데, 이 오차는 하류구간의 침강속도 산정시 높은 수온에 대한 동점성계수 값을 본 연구에서 유도한 경험식으로 계산한 것도 원인중의 하나에 포함될 것이다.
핵심용어: 유사량 측정기; 부유사 농도분포; Rouse 수; 동점성계수 경험식; 침강속도
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