NDLI: The Effect of Discharge, Tides, and Wind on Lift-Off Turbulence

Content Provider	Springer Nature Link
Author	Wang, Jianfeng MacDonald, Daniel G. Orton, Philip M. Cole, Kelly Lan, Jian
Copyright Year	2015
Abstract	Data from three deployments of a 1200 kHz moored Acoustic Doppler Current Profiler (ADCP) were used to study the factors affecting turbulent kinetic energy (TKE) production in the lift-off zone of a mid-sized river plume (Merrimack River, Newburyport, MA) during the spring freshets of 2007, 2010, and 2011. TKE production was estimated from the ADCP data, during periods of minimal wave activity, using the variance method, with significant variability in plume thickness and TKE production observed between ebbs. Correlations with this observed variability and the primary environmental variables, such as river flow, wind speed/direction, and tidal range, were noted. On the basis of these observations, we quantify the contribution of these forcing mechanisms to the observed TKE production using an empirical approach based on the marginal value of the discharge Froude number (which is scaled from the environmental variables) above a critical value of one. The resulting regression provides a means for estimating TKE production in the lift-off zone as a function of only the environmental variables, and produces results consistent with previous observations from other turbulence measurement techniques in the Merrimack plume. The regression also provides an indication of the relative importance of the various forcing mechanisms, and suggests that onshore (east) winds and river discharge are the most important factors in controlling TKE production in the Merrimack plume, with tidal range of lesser significance.
Starting Page	2117
Ending Page	2131
Page Count	15
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	6
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2015-03-17
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Turbulent kinetic energy production River plume Lift-off zone ADCP variance method Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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