NDLI: Analysis of Wind-Induced Thermocline Oscillations of Lake Tanganyika

Content Provider	Springer Nature Link
Author	Naithani, Jaya Deleersnijder, Eric Plisnier, Pierre Denis
Copyright Year	2003
Abstract	An analysis is presented of the wind-induced thermocline oscillations of Lake Tanganyika, East Africa. The region undergoes a four month dry season and the wet season for the rest of the year. The dry season is characterised by nearly constant high southeasterly winds, while for the rest of the year mild wind blows generally from the northeast. Observations show that the dry season high winds cause tilting of the thermocline, being higher/lower than normal at the southern/northern ends of the lake. The thermocline tries to restabilise itself after the cessation of dry season winds and oscillates for the rest of the year. A non-linear reduced-gravity model is used to study the thermocline oscillations of the lake. The numerical simulations satisfactorily represent the oscillations, their period and amplitude. Different forcing conditions (thermocline depth, wind stress and stability) are used in the model and their effect on the period and amplitude of the oscillations are studied. The amplitude of oscillations ranges from 15 to 45 m, while their period varies from 3 to 4 weeks according to the variation in the model parameters. Wavelet transform is used to study the evolution of periods of oscillations with depth in the time series of observations and along the length of the lake using model simulations. Wavelet spectra presents several dominant modes including the semidiurnal, diurnal, synoptic, intraseasonal variability, besides the modes representing the wind-induced thermocline oscillations.
Starting Page	23
Ending Page	39
Page Count	17
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	3
Issue Number	1
e-ISSN	15731510
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Meteorology/Climatology Oceanography Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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Keyword Index

What is Environmental Fluid Mechanics?

Chemical Plume Tracing

Wind- and tide-induced currents in the Stagnone lagoon (Sicily)

Turbulence structure and coherent vortices in open-channel flows with wind-induced water waves

Prefacing the second decade

Environmental hydraulics: a contemporary topic

Verification of Wind-Driven Volatilization Models

Downward Migration of Dense Bottom Currents

Analysis of Wind-Induced Thermocline Oscillations of Lake Tanganyika

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Keyword Index

What is Environmental Fluid Mechanics?

Chemical Plume Tracing

Wind- and tide-induced currents in the Stagnone lagoon (Sicily)

Turbulence structure and coherent vortices in open-channel flows with wind-induced water waves

Prefacing the second decade

Environmental hydraulics: a contemporary topic

Verification of Wind-Driven Volatilization Models

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Analysis of Wind-Induced Thermocline Oscillations of Lake Tanganyika