| Appendix 3.5 | Calculations of NO2 Concentration inside the Two Sections | ||||||||||
| of Deckover on Road D1 | |||||||||||
| Section between Area 138A/B | - | Normal speed | |||||||||
| and Area 65D R1 Site | |||||||||||
| Tunnel Parameter | |||||||||||
| Tunnel length (m), L | = | 115 | |||||||||
| Tunnel height (m), H | = | 10 | |||||||||
| Tunnel width (m), W | = | 22 | |||||||||
| Tunnel size (m2), At | = | H * W | |||||||||
| 220 | |||||||||||
| Equivalent diameter (m), dt | = | (4*At/p)^0.5 | |||||||||
| 16.73657 | |||||||||||
| Effective length of the tunnel (m), Le | = | L + 2*3*dt | |||||||||
| 215.4194 | |||||||||||
| Emission Data | |||||||||||
| Traffic Breakdown (%) | |||||||||||
| Traffic flow (veh/hr) | P/C | Taxi | Bus | LGV | HGV | ||||||
| Tunnel traffic | 3400 | 51 | 18 | 4 | 9 | 18 | |||||
| Q (veh/hr) | 1734 | 612 | 136 | 306 | 612 | ||||||
| P/C | Taxi | Bus | LGV | HGV | |||||||
| Emission Factor (g/km) - EURO3 | 0.71 | 0.73 | 6.8 | 1.23 | 3.84 | ||||||
| Weighted NOX E.F. (g/km/veh) | = | 1.5674 | |||||||||
| NO2 emission factor per unit length (g/m/s), w | = | 0.000296 | |||||||||
| Vehicle Data | |||||||||||
| Nominal dimensions of vehicles are given in Transport Planning and Design Manual, Vol. 2 as: | |||||||||||
| W | H | L | |||||||||
| Cars and Taxi | 1.7 | 1.5 | 4.6 | ||||||||
| Bus | 2.5 | 4.6 | 12 | ||||||||
| LGV | 2.1 | 1.6 | 5.2 | ||||||||
| HGV | 2.5 | 4.6 | 16 | ||||||||
| Nominal cross-sectional area (m2) | = | (1.7*1.5*(0.51+0.18))+(2.5*4.6*0.04)+(2.1*1.6*0.09)+(2.5*4.6*0.18) | |||||||||
| = | 4.5919 | ||||||||||
| Number of lanes per direction, nl | = | 2 | |||||||||
| Equivalent cross-sectional area for each direction (m2), Av | = | 9.1838 | |||||||||
| Equivalent diameter of vehicle (m), dv | = | (4*Av/p)^0.5 | |||||||||
| = | 3.41953 | ||||||||||
| Traffic density (traffic flow /s), N | = | 0.944444 | |||||||||
| Average vehicle speed (m/s), v | = | 50 km/hr | |||||||||
| = | 13.88889 | ||||||||||
| Head to head distance on a lane (m), l | = | 2*nl*v/N | |||||||||
| = | 58.82353 | ||||||||||
| Diffusion Parameters | |||||||||||
| Reynolds number, Re | = | (v*dv)/s | where s = 15.6*10^-6 | ||||||||
| = | 3044454 | ||||||||||
| According to Figure 16 (Ohashi and Koso) | |||||||||||
| Since | l / dt | = | 3.51467 | ||||||||
| D / (N * dt^2 * Re^0.13) | = | 0.33 | |||||||||
| Longitudinal | |||||||||||
| diffusion coefficient (m2/s) , D | = | 0.37 * (N * dt^2 * Re^0.13) | |||||||||
| = | 607.9666 | ||||||||||
| Maximum Concentration of NO2 | |||||||||||
| Cmax (µg/m3) | = | w * Le^2 / (8 * D * At) | |||||||||
| (without background) | = | 12.83996 | |||||||||