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: o full ecosystem function o 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 GES Develop regional Large-scale standards Modelling of Measurement Soundscape Soundscape planning tool
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
2000 Hz 5 percentile Soundscape maps for 10 percentile 25 percentile 50 percentile management 75 percentile 90 percentile 95 percentile 125 Hz 5 percentile 10 percentile 0 – 15 m 25 percentile 30 – bottom 50 percentile 75 percentile Full depth 90 percentile 95 percentile In total: 63 Hz 21 maps per frequency and 5 percentile 10 percentile month, 63, 125 and 2000 Hz 25 percentile 50 percentile 75 percentile Total: 757 maps 90 percentile 95 percentile
We have to relate to the fact that modelling of the ambient soundscape generates maps We identified Depth dependence Monthly that these variables are important Percentiles Frequency dependence And they result Areal Temporal in two coverage coverage 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 5% of time 82 dB 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 5% of time 82 dB 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 (SSA n ) Temporally Sonified Area (TSA n )
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