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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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