標題: Modelling of hyperconcentrated flow in steep-sloped channels
作者: Chen, Chien-Hua
Lin, Ying-Tien
Chung, Hau-Rong
Hsieh, Te-Yung
Yang, Jinn-Chuang
Lu, Jau-Yau
土木工程學系
Department of Civil Engineering
關鍵字: Hyperconcentrated flow;rheological relationship;sediment carrying capacity;sediment transport;two-dimensional depth-averaged flow model
公開日期: 1-Jan-2018
摘要: An unsteady two-dimensional depth-averaged numerical model for hyperconcentrated flows in steep-sloped alluvial channels is developed and applied to the Zhuoshui River in Central Taiwan. In this model, the suspended load and bed load are both included to reproduce actual sediment transport characteristics of steep-sloped channels in the chosen study river reaches. A rheological relationship for Bingham fluid and the formula for the sediment carrying capacity, established through laboratory experiments, are used to describe the hyperconcentrated flow behaviour in the model. At peak discharge during Typhoon Morakot, bed shear stress from the hyperconcentrated flow model can be 150% larger than that from the clear water model. According to the simulation for Tung-Pu-Rey Creek, an upstream tributary of Zhuoshui River, the temporal evolution of bed changes obtained from the model can be used to provide plausible explanations for the reasons behind levee failure during Typhoon Toraji.
URI: http://dx.doi.org/10.1080/00221686.2017.1372816
http://hdl.handle.net/11536/145159
ISSN: 0022-1686
DOI: 10.1080/00221686.2017.1372816
期刊: JOURNAL OF HYDRAULIC RESEARCH
Volume: 56
起始頁: 380
結束頁: 398
Appears in Collections:Articles