NMPB-Fer 1996

Use Non-Standard Reference Time D/E/N

With the option „Use Non-Standard Reference Time“ deactivated the following time interval lengths will be considered: Day (D)=16 hours, Night (N)=8 hours. When this option is activated the time intervals and penalties on the „Reference Time“ tab (see Reference Time Tab) are taken into account.

This option has to be activated for calculations according to END (Environmental Noise Directive EU2002/49/EG-2002) in order to consider the number of trains (or the emission parameter) during the Evening period as well.

Note

The values displayed here are updated based on the defined time intervals DEN on the „Reference Time“ tab.

All Emissions at 0.8m above railhead (no source at 0.05m)

The emission model of NMPB-Fer considers two emission heights. Activating this option will put all emission to a common height of 0.8 m above railhead.

Meteorology

Via the button „Meteorology“ the percentage of „favorable conditions“ in wind sectors stepped by 20° can be specified for the time periods D/E/N separately. The percentage refers to the assessment interval, usually an entire year.

Note 1 - „Favorable conditions“ are such which facilitates the propagation of sound (i.e. which are likely to cause a higher sound pressure level at the receiver point than with a moderate situation). This situation makes use of the (spectral) ground attenuation for moderate downwind as specified by ISO 9613-2 .

Note 2 - By the condition „homogène“ the contrary is assumed, the propagation situation is now neither downwind, nor moderate. The rays are straight lines, not accounting for any atmospheric influence. This kind of meteorological situation has been applied by all former prediction models used in France.

Evening Values = Day Values

With this option active the daytime values will be applied for the Evening period as well.

List Box Locations

The list box offers a variety of predefined locations within France combined with respective data for the percentage of favorable conditions.

For more details see NMPB-Routes 1996, List Box / Locations.

Note

No hint is possible here what percentage may apply to an unknown location when just having a general description of the local orography.