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조재웅,남아름,우태영,박상덕,Cho, Jaewoong,Nam, A-Reum,Woo, Tae Young,Park, Sang Deog 한국수자원학회 2016 한국수자원학회논문집 Vol.49 No.6
본 연구는 급경사 자갈하상 만곡수로의 이동상 수리실험을 이용하여 만곡부 최대세굴심 산정공식들의 적용성을 평가하였다. 평균입경 43mm의 하천자갈을 $90^{\circ}$ 만곡 급경사 개수로에 포설하고 유량과 하상경사에 따른 만곡부의 최대세굴심을 조사하고 세굴심 공식으로 산정한 최대세굴심과 비교하였다. 자갈하상 만곡부 국부세굴은 유입부의 하상경사 0.02이상 $F_r$ 0.95이상에서 발생하였다. 이 수로에서 Lacey공식과 Zeller공식을 제외한 기존 세굴심 산정공식들은 최대세굴심을 과대 추정하는 것으로 나타났다. 하상재료를 고려한 Lacey공식과 접근경사와 만곡도를 반영한 Zeller공식은 급경사 자갈하상 만곡부의 최대세굴심 평가에 적용될 수 있는 것으로 판단된다. The existing methods to estimate the maximum scour depth in the bend of steep gravel bed channel have been evaluated by the hydraulic movable-bed experiments. In the $90^{\circ}$ bend steep-slope channel paved with the fluvial gravels which are uniform in size and have a mean diameter of 43mm, the maximum scour depths due to the flow discharge and the gradient of bed slope have been investigated and compared with the scour depth computed from the equations. The local scour has occurred in conditions that the bed slope is steeper than 0.02 and the $F_r$ is greater than 0.95. Except Lacey's equation and Zeller's equation, the existing methods computing the maximum scour depth overestimate the maximum scour depth in the steep channel with the very coarse gravel bed. However, Lacey's equation with the bed material size and Zeller's equation considering the approach channel gradient and the bend angle may be relatively used to estimate the scour depth in bend of the steep gravel-bed river.
양재준 ( Jae Jun Yang ),박상덕 ( Sang Deog Park ),신승숙 ( Seung Sook Shin ),우태영 ( Tae Young Woo ) 한국지형학회 2014 한국지형학회지 Vol.21 No.1
The purpose of this paper is to find the characteristics of bed material shape of gravel bed rivers in Yeongdong area. Shape factor, roundness, abrasion, sphericity, rectangular parallelepiped, grain size distribution and mean diameter of riverbed materials have been measured in rivers of Gangneungnamdae, Yeongok, and Yangyangnamdae. A photographic image technique has been used to get data for the particle size distribution and mean diameter of riverbed surface materials. The distributions of shape factor, roundness, rectangular parallelepiped of bed materials in a river had a similar trend with each other sites. The proportion of which these values are less than 0.5 has been high in upstream. Sphericity of riverbed materials by applying the Sneed-Folk’s 10 classification diagram is that the proportion of B is the largest. The rate of C~CE which mean near sphere decreased with going up the upstream. Also, the mean diameter of bed surface materials in the low flow bed has been greater than in the high flow bed, however the grain size distributions in the low flow channel have been similar with those in the high flow bed. As a result, it is confirmed that the riverbed materials become smaller and similar with a sphere by abrading and sorting during sediment transport of river water flow in downward.