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Evaluation of bed load transport subject to high shear stress fluctuations

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Evaluation of bed load transport subject to high shear stress fluctuations
นักวิจัย : Cheng, Nian-Sheng , Tang, Hong-Wu , Zhu, Lijun
คำค้น : DRNTU::Engineering::Civil engineering::Water resources.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2547
อ้างอิง : Cheng, N. S., Tang, H. & Zhu, L. (2004). Evaluation of bed load transport subject to high shear stress fluctuations. Water Resources Research, 40. , 0043–1397 , http://hdl.handle.net/10220/7682 , http://dx.doi.org/10.1029/2003WR003001
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Water resources research
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Many formulas available in the literature for computing sediment transport rates are often expressed in terms of time mean variables such as time mean bed shear stress or flow velocity, while effects of turbulence intensity, e. g., bed shear stress fluctuation, on sediment transport were seldom considered. This may be due to the fact that turbulence fluctuation is relatively limited in laboratory open-channel flows, which are often used for conducting sediment transport experiments. However, turbulence intensity could be markedly enhanced in practice. This note presents an analytical method to compute bed load transport by including effects of fluctuations in the bed shear stress. The analytical results obtained show that the transport rate enhanced by turbulence can be expressed as a simple function of the relative fluctuation of the bed shear stress. The results are also verified using data that were collected recently from specifically designed laboratory experiments. The present analysis is applicable largely for the condition of a flat bed that is comprised of uniform sand particles subject to unidirectional flows.

บรรณานุกรม :
Cheng, Nian-Sheng , Tang, Hong-Wu , Zhu, Lijun . (2547). Evaluation of bed load transport subject to high shear stress fluctuations.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Cheng, Nian-Sheng , Tang, Hong-Wu , Zhu, Lijun . 2547. "Evaluation of bed load transport subject to high shear stress fluctuations".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Cheng, Nian-Sheng , Tang, Hong-Wu , Zhu, Lijun . "Evaluation of bed load transport subject to high shear stress fluctuations."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2547. Print.
Cheng, Nian-Sheng , Tang, Hong-Wu , Zhu, Lijun . Evaluation of bed load transport subject to high shear stress fluctuations. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2547.