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http://dx.doi.org/10.9765/KSCOE.2012.24.1.026

Effect of Incidence Angle of Current on the Hydraulic Resistance Capacity of Clayey Soil  

Kim, Young-Sang (Department of Marine and Civil Engineering, Chonnam National University)
Han, Byung-Duck (Department of Civil and Environmental Engineering, Chonnam National University)
Kang, Gyeong-O (Department of Civil and Environmental Engineering, Chonnam National University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.24, no.1, 2012 , pp. 26-35 More about this Journal
Abstract
Until now, study on the hydraulic resistance characteristics of the ground at the river and the ocean current has been focused on the behavior under uni-directional flow without the direction change of flow. However, recent research result shows that scour rate which were measured under the bi-directional flow was much higher than those measured under uni-directional flow for both fine grained and coarse soil. Since the direction of inflow and return flow at the shore, where the structure will be constructed, is not always $180^{\circ}$, effect of the incidence angle on the hydraulic resistance capacity of the ground should be examined. Using the improved EFA which can consider the direction change of flow, hydraulic resistance capacities of the artificially composed clayey fine grained soil and clayey sandy soil under $0^{\circ}$, $90^{\circ}$, $135^{\circ}$, $180^{\circ}$ flow angle of incidence were assessed. Test result shows that hydraulic resistance capacity decreases and scour rate increase with the increase of the incidence angle between inflow and return flow. For the low consolidation pressure condition, hydraulic resistance capacity of the fine grained soil decreases rapidly. While the hydraulic resistance capacity of the coarse grained soil decreases more rapidly than fine grained soil under high consolidation pressure. Eventually since the larger the incidence angle between inflow and return flow, the larger the scour rate. Hydraulic resistance capacity under bi-directional flow($0^{\circ}{\longleftrightarrow}180^{\circ}$) should be examined for the design purpose.
Keywords
clayey soil; tidal flow; bi-directional current; incidence angle; hydraulic resistance capacity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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