Indeed, the torrential rains that characterise
the summer monsoon season lead to massive runoff down increasingly
deforested slopes. The result is catastrophic erosion and watercourses
with particularly high sediment loads. When the river water comes
in contact with seawater in the estuary these sediments precipitate
out to form a mud plug that clogs the shipping channels and thus
hampers access to Hai Phongs economically important port.
To correct this situation, frequent dredging is required to allow
the ships to pass.
In this study we are developing an optical satellite imagery processing
method to study sediment transport so as to optimise costly and
fastidious field data acquisition programmes. The sediment transport
and coastal dynamics studies are part of the preliminary studies
for port and marine facility engineering works as well as locating
the areas to dredge. These studies are also being carried out to
update old bathymetric maps (depth charts) and to check local maps