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Characteristics of Positive Surges in a Rectangular Channel
- Source :
- Water, Volume 10, Issue 10, Water, Vol 10, Iss 10, p 1473 (2018)
- Publication Year :
- 2018
- Publisher :
- MDPI AG, 2018.
-
Abstract
- A positive surge is an unsteady open channel flow motion characterized by an increase of flow depth. In previous experimental studies, a positive surge was typically induced by either a sudden increase of discharge in a channel or by the rapid closure of a downstream sluice gate, thus leading to a steep initial profile. However, in many instances, the evolution of a positive surge is of a progressive manner (e.g., in the downstream navigation canal during the emptying operation of lock chambers). In the present work, the inception and development of a positive surge induced by a progressive increase of discharge was investigated in a rectangular channel with a smooth bed. Both undular and breaking surges were studied. The results demonstrate that the maximum wave height at the first wave crest of an undular surge is in very close agreement with the McCowan theory. Additionally, the wave amplitude essentially shows a linearly increasing trend with an increasing surge Froude number up to Fr0 = 1.26 to 1.28, whereas it tends to suggest a power law reduction for larger surge Froude numbers. Moreover, the dispersion of undular surges is consistent with the linear wave theory only for surge Froude numbers close to unity. Overall, the present study demonstrates the unique features of positive surges induced by a progressive increase of discharge.
- Subjects :
- lcsh:Hydraulic engineering
dispersion characteristics
0208 environmental biotechnology
Geography, Planning and Development
breaking surge
progressive
surge Froude number
02 engineering and technology
Aquatic Science
Biochemistry
Power law
symbols.namesake
lcsh:Water supply for domestic and industrial purposes
lcsh:TC1-978
Froude number
Surge
Dispersion (water waves)
Water Science and Technology
lcsh:TD201-500
undular surge
Mechanics
020801 environmental engineering
Open-channel flow
Amplitude
Airy wave theory
symbols
Geology
Communication channel
Subjects
Details
- ISSN :
- 20734441
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Water
- Accession number :
- edsair.doi.dedup.....13f552f486d74dc6a2e4af357c4db352