Please use this identifier to cite or link to this item:
Experiments of Hydraulic Mechanics and Local Scour Characteristics around the Tilted-Single Plant
|關鍵字:||植物水理;plant hydraulics;沖刷坑型態;紊流動能;scour hole;turbulent kinetic energy||出版社:||水土保持學系所||引用:||Ackerman, J. D. and Okubo, A. (1993). “Reduced mixing in a marine macrophyte canopy,” Functional. Ecology, 7, 305-309. Ana, D, (2001). “Modeling of water and sediment transport over grassed area,” Journal of Hydrology, 248, 168-182. Angelina, A. J. and James, C. S. (2003). “Experimental study of bed load transport through emergent vegetation,” Journal of Hydraulic Engineering, 129, 6, 474-478. Belcher, S., Jerram, N. and Hunt, J. (2003). “Adjustment of a turbulent boundary layer to a canopy of roughness elements,” Journal of Fluid Mechanics, 488, 369-398. Brown, G. and Roshko, A. (1974). “On density effects and large structure in turbulent mixing layers,” Journal of Fluid Mechanics, 64, 775–816. Chen, S. C., Kuo, Y. M. and Li, Y. H. (2011). “Flow characteristics within different conﬁgurations of submerged ﬂexible vegetation,” Journal of Hydrology, 398, 124–134. Coceal, O. and Belcher, S. (2004). “A canopy model of mean winds through urban areas,” Quarterly Journal of the Royal Meteorological Society, 130, 1349-1372. Dargahi B., 1990, “Controlling mechanism of local scouring,” Journal of Hydraulic Engineering., ASCE, 116(10): 1197-1214. Dey S., 1999, “Time-variation of scour in the vicinity of circular piers,” Proc. Instn Civ. Engrs Wat., Marit. & Energy, 136: 67-75. Dey, S. and Raikar, R, V. and Roy, A (2008) “Scour at submerged cylindrical obstacles under steady flow,” . Journal of Hydraulic Engineering, ASCE, 134:1, 105-109. Ghisalberti, M. and Nepf, H. M. (2002). “Mixing layers and coherent structures in vegetated aquatic flows,” Journal of Geophysical Research, 107, NO. C2, 10.1029/2001JC000871. Green, J. C. (2004). “Modeling flow resistance in vegetated streams: review and development of new theory,” Hydrological Processes, 19, 6, 1245-1259. Ikeda, S. and Kanazawa, M. (1996). “Three-dimensional organized vortices above ﬂexible water plants,” Journal of Hydraulic Engineering, 122, 634-640. Jarvela, J. (2002). “Flow resistance of flexible and stiff vegetation: a flume study with natural plants,” Journal of Hydrology, 269, 1-2, 44-54. Kouwen N. and Unny, T. E. (1973). “Flexible roughness in open channels,” Journal of the Hydraulics Division, 99, 5, 713-728. Kouwen, N. (1988). “Field estimation of the biomechanical properties of grass,” Journal of Hydraulic Research, 26, 5, 559-568. Kouwen, N. and Fathi-Moghadam, M. (2000). “Friction factors for coniferous trees along rivers,” Journal of Hydraulic Engineering, 126, 732-740. Kouwen, N. and Li, R. M. (1980). “Biomechanics of vegetative channel linings,” Journal of the Hydraulics Division, 106, 6, 1085-1103. Kutija, V. and Hong, H. T. M. (1996). “A numerical model for assessing the additional resistance to flow introduced by flexible vegetation,” Journal of Hydraulic Research, 34, 1, 99-114. Melville, B. W., 1997, ‘‘Pier and abutment scour: an integrated approach.’’ Journal of Hydraulic Engineering, ASCE, 123(2): 125-136. Melville, B. W., and Chiew, Y. M., 1999, “Time Scale for Local Scour at Bridge Piers” Journal of Hydraulic Engineering, ASCE, 125(1): 59-65. Melville, B. W., and. Coleman S. E., 2000, Bridge Scour, Water Resources Publication., LLC., Highlands Ranch, Colorado, USA. Nepf, H. M. (2012). “Flow and transport in regions with aquatic vegetation,” Annual. Review of Fluid Mechanics, 44, 123-42. Nepf, H. M. and Vivoni, E. R. (1999). “Turbulence structure in depth-limited vegetated ﬂows: transition between emergent and submerged regimes,” In: Proceedings of the 28th International IAHR Conference, Graz, Austria. Nezu, I. and Onitsuka, K. (2001). “Turbulent structures in partly vegetated open-channel flows with LDA and PIV measurements,” Journal of Hydraulic Research, 39, 6, 629-641. Nezu, I. and Sanjou, M. (2011). “PIV and PTV measurements in hydro-sciences with focus on turbulentopen-channel ﬂow,” Journal of Hydro-environment Research, 5, 215-230. Rafael, M. C., Parsons, J. E. and Gilliam J. W. (1999). “Modeling hydrology and sediment transport in vegetative filter strips,” Journal of Hydrology, 214, 111-129. Raudkivi A. J. and Ettema R., 1983, “Clear-water scour at cylindrical piers,” Journal of Hydraulic Engineering., ASCE, 109(3): 338-349. Raupach, M., Finnigan, J. and Brunet, Y. (1996). “Coherent eddies and turbulence in vegetation canopies: the mixing-layer analogy,” Bound.-Layer Meteorology, 78, 351-382. Ree, W. O. and Palmer, V. J. (1949). “Flow of Water in Channels Protected by Vegetative Linings,” U.S Department of Agriculture, Tech. Bull., 967, 115. Rose, C. W., Yu, B., Hogarth, W. L., Okom, A. E. A. and Ghadiri, H. (2003). “Sediment deposition from flow at low gradients into a buffer strip - a critical test of re-entrainment theory,” Journal of Hydrology, 280, 33-51. Sand-Jensen, K. (2003). “Drag and reconfiguration of freshwater macrophytes,” Freshwater Biology, 48, 271-283. Sezaki, T., Hattori, A., Kondo, K., Tokuda, M., Fujita, K., and Yoshida, M., (2000). “Field study on the destruction processes of herbaceous vegetation on gravel bars due to flood flows,” Annual Journal of Hydraulic Engineering, 44, 825-830. Song, T. and Graf, W. H. (1996). “Velocity and turbulence distribution in unsteady open-channel flows,” Journal of Hydraulic Engineering, 122, 3, 141. Stephan, U. and Wibmer, K. (2001). “Experiments on hydraulic roughness of macrophytes,” Environmental Hydraulics an Eco-Hydraulics. Proceedings Theme B. XXIX IAHR Congress, Beijing, China. Sugio, S. and Watanabe, K. (2004). “Destruction of herbaceous vegetation by flood flow on a floodplain in a recovery process,” Proceedings of River Flow 2004, 1315-1323. Sugio, S. Watanabe, K. and Tanoue A. (2003). “Research on the destruction of herbaceous vegetation by flood flow on sand bar in recovering process,” Annual Journal of Hydraulic Engineering, 47, 1003-1008. Tsujimoto, T., Kitamura, T., Fujii, Y. and Nakagawa, H. (1996). ”Hydraulic resistance of flow with flexible vegetation in open channel,” Journal of Hydroscience and Hydraulic Engineering, 14, 1, 47-56. Winant, C. and Browand, F. (1974). “Vortex pairing: the mechanism of turbulent mixing-layer growth at moderate Reynolds number,” Journal of Fluid Mechanics, 63, 237–255.||摘要:||
In recent years, the heavy rainfall converges into river in the watershed and becomes the flooding because of the extreme weather. In Taiwan there are lots of economic crops in floodplain, such as banana and sugar cane. The flood induces the crops to tilt. The tilt crops change the form of riverbed and the flow condition. The study investigated the scour hole, the flow field, and the turbulent kinetic energy (TKE) around the tilt single plant. The experiment used the stainless steel tube to simulate the situation that the plant is affected by flow. Results of an experimental study on clear-water scour at a control set and three different angles (tube with bed; degree of 90, 60, and 45) of the bended tube in uniform bed sediments under steady flow are presented. The velocity field around the tube was measured by Acoustic Doppler Velocimeter (ADV), and we also measured the topography of scour holes by laser range finder.
According to the experimental results, the depth and volume of scour hole is consider with the angle when the tube became more tilt. A jet flow after the flow leaving the tube because the flow was clamped by the tube, and the cast-off vortices and wake was also clamp down by the tube. The vertical and streamwise velocity was extremely unstable around the tube. The maximum of TKE occurred around the tube of the set 45 degrees, the value is about 19, and the high TKE area around the tube, the value is roughly 3 to 18 in all sets. TKE distributed along the tube, when the tube gets more tilt, TKE becomes more stretching. In the flow conditions of this study, TKE exists at roughly 2 to 3cm around the tube. Therefore, the experimental results demonstrate that the tube became more tilt, the fewer effect reflect on riverbed. TKE related with flow condition, and TKE’s distribution changes with the tube.
|Appears in Collections:||水土保持學系|
Show full item record
Files in This Item:
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.