Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure

Taeksang Kim; Julien Malherbe; Sirawit Shimpalee; Jeremy Bricker

Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure

Taeksang Kim, Julien Malherbe, Sirawit Shimpalee, Jeremy Bricker

Hydraulic Structures and Flood Risk

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

Megathrust earthquakes cause tsunamis that can destroy coastal structures and damage buildings, resulting in injuries and deaths. To prevent these consequences and reduce the risk of failure of coastal structures, it is essential to understand the exact mechanism of structure failure. Sub-nappe air cavity pressure during overflow of a vertical structure, which is the main topic of this research, can increase the risk of failure of structure, but had not yet been quantified. In this research, hydraulic experiments were conducted to reveal the relation among the air cavity pressure, overtopping flowrate, and tailwater depth for aerated and non-aerated overflow cases. For the aerated case, we found that air cavity pressure is almost equal to the atmospheric pressure regardless of flowrate and downstream weir height. On the other hand, for the non-aerated case or a partially-aerated case, air cavity pressure is inversely proportional to overtopping flowrate. The relation between air cavity pressure and tailwater depth could be interpreted in different ways based on the flow condition downstream.

Original language	English
Title of host publication	Proceedings of the 37th International Conference on Coastal Engineering, ICCE 2022
Editors	Daniel Cox
Publisher	American Society of Civil Engineers (ASCE)
Number of pages	11
Edition	37
ISBN (Electronic)	9780989661164
Publication status	Published - 2023
Event	37th International Conference on Coastal Engineering, ICCE 2022 - International Convention Centre Sydney, Sydney, Australia Duration: 4 Dec 2022 → 9 Dec 2022 http://icce2022.com/

Publication series

Name	Proceedings of the Coastal Engineering Conference
Number	37
ISSN (Print)	0161-3782

Conference

Conference	37th International Conference on Coastal Engineering, ICCE 2022
Country/Territory	Australia
City	Sydney
Period	4/12/22 → 9/12/22
Internet address	http://icce2022.com/

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

hydraulic experiment
sub-nappe air cavity pressure
vertical structure

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Cite this

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title = "Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure",

abstract = "Megathrust earthquakes cause tsunamis that can destroy coastal structures and damage buildings, resulting in injuries and deaths. To prevent these consequences and reduce the risk of failure of coastal structures, it is essential to understand the exact mechanism of structure failure. Sub-nappe air cavity pressure during overflow of a vertical structure, which is the main topic of this research, can increase the risk of failure of structure, but had not yet been quantified. In this research, hydraulic experiments were conducted to reveal the relation among the air cavity pressure, overtopping flowrate, and tailwater depth for aerated and non-aerated overflow cases. For the aerated case, we found that air cavity pressure is almost equal to the atmospheric pressure regardless of flowrate and downstream weir height. On the other hand, for the non-aerated case or a partially-aerated case, air cavity pressure is inversely proportional to overtopping flowrate. The relation between air cavity pressure and tailwater depth could be interpreted in different ways based on the flow condition downstream.",

keywords = "hydraulic experiment, sub-nappe air cavity pressure, vertical structure",

author = "Taeksang Kim and Julien Malherbe and Sirawit Shimpalee and Jeremy Bricker",

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Kim, T, Malherbe, J, Shimpalee, S & Bricker, J 2023, Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure. in D Cox (ed.), Proceedings of the 37th International Conference on Coastal Engineering, ICCE 2022. 37 edn, Proceedings of the Coastal Engineering Conference, no. 37, American Society of Civil Engineers (ASCE), 37th International Conference on Coastal Engineering, ICCE 2022, Sydney, New South Wales, Australia, 4/12/22.

Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure. / Kim, Taeksang; Malherbe, Julien; Shimpalee, Sirawit et al.
Proceedings of the 37th International Conference on Coastal Engineering, ICCE 2022. ed. / Daniel Cox. 37. ed. American Society of Civil Engineers (ASCE), 2023. (Proceedings of the Coastal Engineering Conference; No. 37).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

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AU - Shimpalee, Sirawit

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PY - 2023

Y1 - 2023

N2 - Megathrust earthquakes cause tsunamis that can destroy coastal structures and damage buildings, resulting in injuries and deaths. To prevent these consequences and reduce the risk of failure of coastal structures, it is essential to understand the exact mechanism of structure failure. Sub-nappe air cavity pressure during overflow of a vertical structure, which is the main topic of this research, can increase the risk of failure of structure, but had not yet been quantified. In this research, hydraulic experiments were conducted to reveal the relation among the air cavity pressure, overtopping flowrate, and tailwater depth for aerated and non-aerated overflow cases. For the aerated case, we found that air cavity pressure is almost equal to the atmospheric pressure regardless of flowrate and downstream weir height. On the other hand, for the non-aerated case or a partially-aerated case, air cavity pressure is inversely proportional to overtopping flowrate. The relation between air cavity pressure and tailwater depth could be interpreted in different ways based on the flow condition downstream.

AB - Megathrust earthquakes cause tsunamis that can destroy coastal structures and damage buildings, resulting in injuries and deaths. To prevent these consequences and reduce the risk of failure of coastal structures, it is essential to understand the exact mechanism of structure failure. Sub-nappe air cavity pressure during overflow of a vertical structure, which is the main topic of this research, can increase the risk of failure of structure, but had not yet been quantified. In this research, hydraulic experiments were conducted to reveal the relation among the air cavity pressure, overtopping flowrate, and tailwater depth for aerated and non-aerated overflow cases. For the aerated case, we found that air cavity pressure is almost equal to the atmospheric pressure regardless of flowrate and downstream weir height. On the other hand, for the non-aerated case or a partially-aerated case, air cavity pressure is inversely proportional to overtopping flowrate. The relation between air cavity pressure and tailwater depth could be interpreted in different ways based on the flow condition downstream.

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Y2 - 4 December 2022 through 9 December 2022

ER -

Sub-Nappe Air Cavity Pressure During Overflow of a Vertical Structure

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Keywords

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