We have chosen to include observations from those regions
where we infer that a sediment source is still available because
of the near presence of the riverine outflow, so that sediment
availability is not a limiting factor. These observations are
taken at different locations that undergo either erosion or
sedimentation from Go Cong to Ganh Hao (chosen locations are
numbered from 1 to 18 in Figure1B; location names can be
found in Table 1). According to the scale classification of shores
and shoreline variability presented by Stiveet al. (2002), we are
interested in evolutional trends based on the middle term scale
with a timescale from years to decades and a space scale from 1
to 5 km. On the basis of the observations the typical length
scale along which the rate of erosion or sedimentation can be
considered rather similar is about 2 km. Ca Mau Peninsula is
not considered since no sea dikes are built along the coastline of
this area. The rate of coastline evolution is calculated on the
basis of the shoreline evolution maps provided by the Southern
Institute of Water Resources Research (2005). The evolution
rates presented in Table 1 are calculated for two periods, from
1965 to 1989 and from 1989 to 2002. For each of the locations
the estimated mangrove width in 2002 is also presented in
Table 1. The mangrove widths, measured from Google Earth
for the year 2006, were converted to 2002 by using the observed
accretion and sedimentation rates. The error term involved in
using this approach is not so much due to ground-referencing
errors (the location of the primary or secondary sea dike is not
influenced by water levels, for instance), but rather due to
alongshore variability over the considered stretches that we
have included in our data presentation (the horizontal error
bars in Figure 5).
We have chosen to include observations from those regionswhere we infer that a sediment source is still available becauseof the near presence of the riverine outflow, so that sedimentavailability is not a limiting factor. These observations aretaken at different locations that undergo either erosion orsedimentation from Go Cong to Ganh Hao (chosen locations arenumbered from 1 to 18 in Figure1B; location names can befound in Table 1). According to the scale classification of shoresand shoreline variability presented by Stiveet al. (2002), we areinterested in evolutional trends based on the middle term scalewith a timescale from years to decades and a space scale from 1to 5 km. On the basis of the observations the typical lengthscale along which the rate of erosion or sedimentation can beconsidered rather similar is about 2 km. Ca Mau Peninsula isnot considered since no sea dikes are built along the coastline ofthis area. The rate of coastline evolution is calculated on thebasis of the shoreline evolution maps provided by the SouthernInstitute of Water Resources Research (2005). The evolutionrates presented in Table 1 are calculated for two periods, from1965 to 1989 and from 1989 to 2002. For each of the locationsthe estimated mangrove width in 2002 is also presented inTable 1. The mangrove widths, measured from Google Earthfor the year 2006, were converted to 2002 by using the observedaccretion and sedimentation rates. The error term involved inusing this approach is not so much due to ground-referencingerrors (the location of the primary or secondary sea dike is notinfluenced by water levels, for instance), but rather due toalongshore variability over the considered stretches that wehave included in our data presentation (the horizontal errorbars in Figure 5).
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