Estuaries and Coasts

, Volume 38, Issue 6, pp 2117–2131 | Cite as

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

  • Jianfeng Wang
  • Daniel G. MacDonald
  • Philip M. Orton
  • Kelly Cole
  • Jian Lan
Article

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.

Keywords

Turbulent kinetic energy production River plume Lift-off zone ADCP variance method 

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Copyright information

© Coastal and Estuarine Research Federation 2015

Authors and Affiliations

  • Jianfeng Wang
    • 1
    • 5
  • Daniel G. MacDonald
    • 2
  • Philip M. Orton
    • 3
  • Kelly Cole
    • 4
  • Jian Lan
    • 5
  1. 1.Key Laboratory of Ocean Circulation and WavesInstitute of Oceanology, Chinese Academy of SciencesQingdaoChina
  2. 2.Department of Civil and Environmental EngineeringUniversity of Massachusetts DartmouthNorth DartmouthUSA
  3. 3.Davidson LaboratoryStevens Institute of TechnologyHobokenUSA
  4. 4.Department of OceanographyTexas A&M UniversityCollege StationUSA
  5. 5.Physical Oceanography LaboratoryOcean University of ChinaQingdaoChina

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