Experimental study on bedload sediment transport under unsteady flow

被引：0

作者：

Duan Z. ^{[1
,2
,3
]}

Chen J. ^{[1
,4
]}

Jiang C. ^{[1
,4
]}

Deng B. ^{[1
,4
]}

Long Y. ^{[1
,4
]}

Wu Z. ^{[1
,4
]}

Qu K. ^{[1
,4
]}

机构：

[1] School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha

[2] Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing

[3] University of Chinese Academy of Sciences, Beijing

[4] Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha

来源：

Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2019年 / 49卷 / 11期

关键词：

Experimental study; Non-uniform sand; Uniform sand; Unsteady flow;

D O I：

10.1360/N092018-00246

中图分类号：

学科分类号：

摘要：

The study of bedload movement under unsteady flow conditions is of great significance both in sediment movement theory and practical engineering applications. Based on the wave-flow flume experiment, the bedload movement under the action of unsteady flow with different speed skewness was studied. Based on the influence of sediment particle size and velocity skewness on sediment transport rate, the motion of uniform sand and non-uniform sand under unsteady flow was analyzed, and the sediment transport rate of steady flow and unsteady flow was described. Meanwhile, the difference in the impact of steady flow and unsteady flow on the sediment transport rate was discussed, and the formula of non-uniform sand transport weight ratio for different sizes was established. On this basis, the theoretical derivation was carried out, and the experimental process was analyzed from the mechanism of force. The experimental results and theoretical analysis show that the sediment particles under the action of unsteady flow are easier to start and transport than the steady flow. © 2019, Science Press. All right reserved.

引用

页码：1372 / 1382

页数：10

共 27 条

[1]

Koehl M.A.R., How do benthic organisms withstand moving water, Am Zool, 24, pp. 57-70, (1984)

[2]

Shields M.A., Woolf D.K., Grist E.P.M., Et al., Marine renewable energy: The ecological implications of altering the hydrodynamics of the marine environment, Ocean Coast Manage, 54, pp. 2-9, (2011)

[3]

Tabarestani M.K., Zarrati A.R., Sediment transport during flood event: A review, Int J Environ Sci Technol, 12, pp. 775-788, (2015)

[4]

Liu C.J., Tang L.M., Qu Z.S., Et al., Experimental system to study unsteady open-channel flow and sedimentation, J Tsinghua Univ (Sci Tech), 45, (2005)

[5]

Liu C.J., Qu Z.S., Li D.X., Et al., Experimental study on bed-load transport in unsteady open channel flows, J Hydroel Eng, 25, pp. 31-37, (2006)

[6]

Cheng X.B., Wang Y.H., Yue P.J., Preliminary study of bed load sediment transport of unsteady flow, J Sediment Res, 3, pp. 10-16, (2011)

[7]

Mao L., The effect of hydrographs on bed load transport and bed sediment spatial arrangement, J Geophys Res, 117, (2012)

[8]

Ma A.X., Lu Y.J., Lu Y., Et al., Experimental study on gravel bed-load transport in unsteady flow, J Hydraul Eng, 44, pp. 800-809, (2013)

[9]

Wu G.M., Hu J., Yang S.F., Comparative study on sediment transport under unsteady flow of open channel, Port Waterway Eng, 5, pp. 117-121, (2015)

[10]

Song T., Graf W.H., Lemmin U., Uniform flow in open channels with movable gravel bed, J Hydraulic Res, 32, pp. 861-876, (1994)

← 1 2 3 →