Towards Establishing Good Environmental Status in the Baltic Sea - - PowerPoint PPT Presentation

Towards Establishing Good Environmental Status in the Baltic Sea

Peter Sigray and the BIAS Team Copenhagen October 2016

Good Environmental Status According to European Union

The environmental status allow:

• full ecosystem function
• resilience to human-induced environmental change

Species and habitats are protected, biodiversity is maintained, biological components function in balance

Definition of noise-GES in Europe

Indicator D11.2 The TG-Noise clarification Continuous noise is mainly about masking

The BIAS-project

A EU-LIFE project: The first large scale attempt to implement management of noise

BIAS – a four step rocket

Develop regional standards

Large-scale Measurement

Modelling of Soundscape

Soundscape planning tool

GES

BIAS Standards

Base-line measurements

Perform measurements in a standardized way at 37 locations for one year Visit each position up to five times over a 15 month period

To extend the results to the full Baltic Sea acoustic modeling was performed using the measured data for “calibrating” the model

Soundscape maps for management

0 – 15 m 30 – bottom Full depth

63 Hz 5 percentile 10 percentile 25 percentile 50 percentile 75 percentile 90 percentile 95 percentile

In total: 21 maps per frequency and month, 63, 125 and 2000 Hz

Total: 757 maps

125 Hz 5 percentile 10 percentile 25 percentile 50 percentile 75 percentile 90 percentile 95 percentile 2000 Hz 5 percentile 10 percentile 25 percentile 50 percentile 75 percentile 90 percentile 95 percentile

We have to relate to the fact that modelling of the ambient soundscape generates maps

Depth dependence Frequency dependence Monthly Percentiles Areal coverage Temporal coverage We identified that these variables are important And they result in two representations

The Soundscape Planning Tool or how to use 757 soundscape maps to manage the Baltic Sea

Two-dimensional space

Assume that we state that the threshold is 82 dB

• This has to be looked at in an area where the

species are residing

• The AREA will partly be covered by sound louder

than 82 dB. How large sonified area can we accept, 50%?

• The area will be covered by sound louder than

82 dB during a portion of the TIME, can we accept 25%?

Percentiles vs. Time

82 dB

5% of time 50% of time 95% of time

SSA: The Proportion of Area for which a Sound Level is exceeded a certain percentage of time

Percentiles vs. Time

82 dB

5% of time 50% of time 95% of time

TSA: The Proportion of Area for which a Sound Level is exceeded a certain percentage as a function of time

Two useful to representation of noise based on n:th percentile

Spatially Sonified Area (SSAn) Temporally Sonified Area (TSAn)