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Lake Iseo Field Experiment. Leticia Chamelete de Vilhena. Energy transfer. Basin-scale internal waves decay at a higher rate than can be accounted for simply by internal dissipation Other mechanisms must act to transfer energy from these basin-scale waves to turbulent scales.

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Lake iseo field experiment

Lake Iseo Field Experiment

Leticia Chamelete de Vilhena


Energy transfer
Energy transfer

  • Basin-scale internal waves decay at a higher rate than can be accounted for simply by internal dissipation

  • Other mechanisms must act to transfer energy from these basin-scale waves to turbulent scales


High frequency waves
High frequency waves

  • Ubiquitous to lakes and oceans

  • Exist in narrow but discrete frequency bands approaching the buoyancy frequency, N

  • Important in the cascade of energy to turbulent scales

  • Enhance dissipation and mixing, bringing significant implications to mass fluxes and bioproductivity


Nonlinear waves
Nonlinear waves

  • 2 groups: waves described by linear stability models, and waves described by nonlinear models

  • Steepening timescale (Horn et al. 2001) determines when nonlinear effects are important

    • Moderate forcing

    • Layer depth ratio


Objectives
Objectives

  • Role of nonlinear waves on the transfer of energy and resulting mixing is still incomplete

  • The breaking of high frequency waves and the resulting mixing may be a significant way of maintaining the lake’s productivity and the health of the ecosystem


Objectives1
Objectives

  • Document the generation of nonlinear waves in the Southern embayment of Lake Iseo

  • Document breaking of high frequency waves and resulting mixing

  • Calculate the energy flux going into high frequency waves and the dissipation in the water column


Methods
Methods

  • F-probe + Microstructure data

  • Non-hydrostatic ELCOM


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