32 Modeling of Leisure Craft Emissions
207
value, (c) not included IMO registry and (d) vessel is not active regularly. Using
the conditions above, approximately 2000 unknown vessels were filtered for further
analysis. A clear majority of these ships are Swedish, Danish and German vessels.
Naturally, the start of the boating season may have large annual variation depending on the harshness of winter each year; the length of season and intensity of activity
are affected by summer weather conditions. The boating activity may start at different times depending on the latitude and may vary according to summer weather
conditions, but inclusion of these features is left for future work. According to the
estimated profile, June-August contains approx. 75% of all activities and there is a
strong diurnal variation and weekends during 10 am–2 pm have the highest activities and public holidays and summer vacation period start are visible. This temporal
profile is also consistent with the distribution of voluntary SAR missions which can
be indirectly linked with leisure boat activity.
Geographical distribution of boat activity
Since little or no information of the geographical distribution of pleasure boat activities exists, the approach taken in this study was to model the geographical distribution
based on marina locations. The key assumption was that the geographical distribution
of leisure craft activities can be associated to the vicinity of marinas. This assumption
is based on the findings of the Swedish survey [5] which indicates that 90% of boats
operate near their marinas.
A list of pleasure craft marinas (boat place counts, location) for each riparian
state was collected based on survey data, existing national studies and satellite image
analysis. The list includes more than 3000 locations for leisure boats in the Baltic
Sea area and accounts for more than 250,000 boats in total. It should be noted that
the list of boat mooring place counts and locations are indicative and their main
purpose is to geographically distribute pre-defined national pleasure boat activities.
The activity is simply spread out as a Gaussian distribution around marina, but it
has been assumed that boats favor the coastline and archipelagos, which extend the
range of their activity.
Technical description of the Baltic Sea boat fleet
The Swedish small boat survey describes the national vessel fleet operating along
the Baltic Sea coast in detail. Data at this level of detail was not available for other
countries, but since almost half of the small boats are of Swedish origin and similarities could be seen between the use and composition of Swedish and Finnish boat
fleets, which together cover about 2/3 of all boats in the area, we assume that fleet
description and usage of boats in the Swedish fleet apply to all boats in the Baltic
Sea.
207
value, (c) not included IMO registry and (d) vessel is not active regularly. Using
the conditions above, approximately 2000 unknown vessels were filtered for further
analysis. A clear majority of these ships are Swedish, Danish and German vessels.
Naturally, the start of the boating season may have large annual variation depending on the harshness of winter each year; the length of season and intensity of activity
are affected by summer weather conditions. The boating activity may start at different times depending on the latitude and may vary according to summer weather
conditions, but inclusion of these features is left for future work. According to the
estimated profile, June-August contains approx. 75% of all activities and there is a
strong diurnal variation and weekends during 10 am–2 pm have the highest activities and public holidays and summer vacation period start are visible. This temporal
profile is also consistent with the distribution of voluntary SAR missions which can
be indirectly linked with leisure boat activity.
Geographical distribution of boat activity
Since little or no information of the geographical distribution of pleasure boat activities exists, the approach taken in this study was to model the geographical distribution
based on marina locations. The key assumption was that the geographical distribution
of leisure craft activities can be associated to the vicinity of marinas. This assumption
is based on the findings of the Swedish survey [5] which indicates that 90% of boats
operate near their marinas.
A list of pleasure craft marinas (boat place counts, location) for each riparian
state was collected based on survey data, existing national studies and satellite image
analysis. The list includes more than 3000 locations for leisure boats in the Baltic
Sea area and accounts for more than 250,000 boats in total. It should be noted that
the list of boat mooring place counts and locations are indicative and their main
purpose is to geographically distribute pre-defined national pleasure boat activities.
The activity is simply spread out as a Gaussian distribution around marina, but it
has been assumed that boats favor the coastline and archipelagos, which extend the
range of their activity.
Technical description of the Baltic Sea boat fleet
The Swedish small boat survey describes the national vessel fleet operating along
the Baltic Sea coast in detail. Data at this level of detail was not available for other
countries, but since almost half of the small boats are of Swedish origin and similarities could be seen between the use and composition of Swedish and Finnish boat
fleets, which together cover about 2/3 of all boats in the area, we assume that fleet
description and usage of boats in the Swedish fleet apply to all boats in the Baltic
Sea.