NDLI: Surface thermal structure in a shallow-water, vertical discharge from a coastal power plant

Content Provider	Springer Nature Link
Author	Marmori, George Savelyev, Ivan Smith, Geoffrey B.
Copyright Year	2014
Abstract	The surface temperature field induced by a turbulent buoyant jet, discharging upwards into shallow water and impinging on the water surface, is examined for the case of a power-plant cooling-water outfall off the southern California coast. The data, acquired using an airborne infrared camera, capture the evolution of turbulent-scale structure, as well as the advection of larger-scale patterns that can be used to infer the surface velocity. Some limited in-water measurements were also made. When the ambient, or receiving, water is relatively stagnant, the buoyant fluid moves nearly symmetrically outward from the impingement zone, and both the thermal and velocity fields decay over a radial distance of several tens of meters. Flow in this symmetric case appears to remain supercritical into the far-field, which differs from a recent numerical modeling study that predicts a near-field hydraulic jump. Within the plume, the data show an expanding set of thermal bands, similar to ring-like structures found in laboratory studies of a buoyant vertical jet having a stable near-field. In the presence of an alongshore current, both the plume and thermal bands become stretched out in the downstream direction; but this effect can be accounted for, and the thermal structure made symmetrical, by using an approximate two-dimensional model of the flow field. Characteristics of the observed thermal bands are compared against three ring-creation mechanisms proposed in the literature (jet vortex instability, horizontal shear instability, and internal bore formation), but the present dataset is insufficient to discriminate amongst them.
Starting Page	207
Ending Page	229
Page Count	23
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	15
Issue Number	1
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-07-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vertical jet Cooling water outfall Buoyant plume Thermal bands Infrared remote sensing Huntington Beach California (U.S.A.) Earth Sciences Environmental Physics Hydrology/Water Resources Mechanics Hydrogeology Oceanography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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