| Title |
Experimental Study of Vegetated Flows in the Stream-scale Natural Channel |
| Authors |
류용욱(Ryu, Yong-Uk) ; 김지현(Kim, Jihyun) ; 지운(Ji, Un) ; 강준구(Kang, Joongu) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.5.0587 |
| Keywords |
유속;식생;하천 규모 실험;초음파 유속계 Flow velocity;Vegetation;Stream-scale experiment;ADV |
| Abstract |
This study experimentally investigated the effects of high and low densities of vegetation patches on the flow characteristics in a stream-scale outdoor experimental channel with rooted willows. Stream-scale experiments on vegetated flows were carried out for an emergent condition of vegetation. Vegetation patches were arranged by alternate bar formation and the flows in vegetated and non-vegetated sections were compared. Three-dimensional flow structure was measured by ADV (Acoustic Doppler Velocimeter) and the vertical distributions of longitudinal velocity were mainly analyzed from the measurements at various points. Flow velocities show different patterns depending on the density of vegetation patches. The difference in flow velocity between in the vegetated and non-vegetated sections appear to large in the dense patches and the flow becomes complicated at the downstream edge of the patch. Despite the upstream flow disturbed by the first patch, the flows over the second patch show the similar pattern. |