Noise impact of an international traffic corridor in alpine environment: traffic scenarios and population exposure in Mont Blanc area

Transcription

1 Noise impact of an international traffic corridor in alpine environment: traffic scenarios and population exposure in Mont Blanc area Filippo Berlier, Giovanni Agnesod, Marco Cappio Borlino, Christian Tibone, Christian Tartin, Daniele Crea

2 The area object of the analysis and its position in Europe: The Mont Blanc Tunnel and the town of Courmayeur Mont Blanc Tunnel entrance National Road Highway

3 The area object of the analysis and its position in Europe: The Mont Blanc Tunnel and the town of Courmayeur Mont Blanc Tunnel entrance

4 The project step by step 1. Noise Mapping of the area of interest - Noise measurements - Traffic flow data - Digital model contruction - Noise mapping 2. Estimate of the population territorial distribution - Evaluation of the total volume of all the residential buildings - Calculation of inhabited volume density for each village and street of Courmayeur - Evaluation of the average number of inhabitants for dwelling - Consideration for tourist attendance in hotel or holiday houses 3. Estimate of the population noise exposure - Evaluation of the population exposed to the different sound classes on the basis of the result of noise mapping

5 Acoustic parameters Sound pressure level Lp = Log p p Logarithmic scale Measure unit db (A) Noise annoyance as a longtime exposure effect Longtime indicators Continuous equivalent sound level Leq(A) = Log 1 T T 0 p p dt

6 Acoustic parameters 85 db (A) (Wednesday, January 25, :17:00) - Time History - Leq (Wednesday, January 25, :17:00) - Time History - Leq - Running Leq db 66.7 db s Exemple of sound pressure level and equivalent sound level for a traffic measurement made on a road edge

7 Noise indicators: from italian legislation L day Evaluated from 06:00 to 22:00 Daytime/Diurnal - noise indicator L night Evaluated from 22:00 to 06:00 Nighttime/Nocturnal - noise indicator

8 Noise indicators: from european directives Indicators for the evaluation of the population exposure to environmental noise L den Log L day 2 L evening 5 8 L night Where : Daytime level = Eveningtime level = Nighttime level = L night Evaluated from 22:00 to 6:00

9 Modelling road sources NMPB-Routes-96 (XP S ) Nouvelle méthode pour la prévision du bruit

10 How the model runs? Calculation of the sound level in the points of a grid covering the studied area following an algorithm based on the general equation of sound wave propagation Sound source level Point of estimate / receiver Propagation

11 How the model runs? Calculation of the sound level in the points of a grid covering the studied area following an algorithm based on the general equation of sound wave propagation Air absorption Barriers Geometrical divergence Ground absorption

12 Lden sound levels territorial distribution before (a) and after (b) the opening of the last section of the highway E25, for the most in gallery Scenario a Scenario b Meters Meters

13 Lden sound levels territorial distribution before (a) and after (b) the opening of the last section of the highway E25, for the most in gallery Scenario a db(a) < > 75 Scenario b Meters Meters

14 Lnight sound levels territorial distribution before (a) and after (b) the opening of the last section of the highway E25, for the most in gallery Scenario a Scenario b Meters Meters

15 Lnight sound levels territorial distribution before (a) and after (b) the opening of the last section of the highway E25, for the most in gallery db(a) Scenario a < > 70 Scenario b Meters Meters

16 Estimate of the population territorial distribution Comune di Courmayeur Village / Street inhabitants Volume of residential buildings inhabitants / m 3 Entrèves Inhabitants for each building La Saxe x V i Entrèves... Entrelevie La Villette La Saxe Villair Village / Street inhabitants Volume of buildings (residential + hotels and holiday houses) inhabitants / m 3 Dolonne Courmayeur Capoluogo Inhabitants for each building La Saxe x V i Entrèves...

17 Estimate of the population noise exposure Estimate of the population noise exposure per acoustic class

18 % exposed population Percentage of exposed population for L den bands of values noise traffic on national road SS26 after opening highw ay E25 noise traffic on national road SS26 before opening highw ay E <55 55_59 60_64 65_69 70_74 >75 bands of values db(a) Exposed population (%) Bands of values of L den (dba) < >75 Scenario a Scenario b

19 % exposed population Percentage of exposed population for L night bands of values noise traffic on national road SS26 after opening highw ay E25 noise traffic on national road SS26 before opening highw ay E <45 45_49 50_54 55_59 60_64 65_70 >70 bands of values db(a) Exposed population (%) Bands of values of L night (dba) < >70 Scenario a Scenario b

20 occurancy % Other results: Statistic distributions of short term Leq values (30 s), period (L day ), at an hotel near the national road 12 noise traffic on national road SS26 after opening highw ay E25 noise traffic on national road SS26 before opening highw ay E decibel (A)

21 Other results: L day curve of the sound levels at 40 dba before (a) and after (b) the opening of the last section of the highway E25, for the most in gallery Scenario a Scenario b db(a) < 40 > 40

22 Thank you