Behaviors of Bubble-Entrained Plumes in Air-Injection Artificial Upwelling
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 7
Abstract
This paper studies bubble-entrained plume (BEP) behaviors in a crossflow and proposes a theoretical approach for predicting BEP trajectories and the separation points from the bubble swarm. When rising in a crossflow, the BEP is separated from the bubble swarm and becomes a negatively buoyant fountain. By treating the BEP trajectory as two distinct parts based on the separation point from the bubble swarm, a new BEP trajectory can be expressed as a piecewise equation. Laboratory experiments conducted in different conditions study the effects of air flow rate and crossflow velocity on the BEP behaviors. Experimental results show that the larger the crossflow velocity is, the narrower the width and the smaller the spreading rate of air-bubble plume becomes. The theoretical approach developed in this study is also used to calculate the minimum air injection volume flow rate for artificial upwelling, which has a direct application for estimating the upwelling of nutrient-rich water into the euphotic layer as a way to enhance primary production in nutrient-depleted surface waters.
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Acknowledgments
This research is a contribution to the international Integrated Marine Biosphere Research (IMBeR) project and is financially funded by the National Key Research and Development Plan (2016YFA0601404), the National Natural Science Funds of China (Nos. 51120195001 and 41406084), the International Science and Technology Cooperation Program of China (No. 2015DFA01410), and the Public Welfare Project of Science Technology Department of Zhejiang Province, China (No. 2015C31096). The contributions of author Rivkin were supported by The Natural Sciences and Engineering Research Council of Canada and the 2016 and 2017 President’s International Fellowship Initiative of the Chinese Academy of Sciences (2016VTA038) and (2016VTAXXX).
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 22, 2017
Accepted: Nov 28, 2017
Published online: Apr 19, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 19, 2018
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