270
J. Populus et al.
Moreover, a ratio (PDTz) could be calculated by dividing for each depth the
immersion duration by the total duration.
Application to Dredging Plans
THE SEDIMENTOLOGICAL BALANCE OF THE BASIN
Obviously, the sedimentological balance is positive in the southern par of the basin.
Siltation is particularly strong in
culture areas where two feet high
metallic structures produce heavy sediment deposition. However, the quantification of
this phenomenon remains very approximate and tools are needed to prioritize dredging
and cleaning operations.
The 1985 depth survey was processed with geostatistics exactly the same way
as described above for the 1994-96 survey. By subtracting the two situations, a
difference map was obtained and transformed into a grid file in ArcView. Using the
operation applied to the bank file, it is possible to display the average
sediment balance per bank. Fig. 5 denotes an almost homogeneous accumulation of
J. Populus et al.
Moreover, a ratio (PDTz) could be calculated by dividing for each depth the
immersion duration by the total duration.
Application to Dredging Plans
THE SEDIMENTOLOGICAL BALANCE OF THE BASIN
Obviously, the sedimentological balance is positive in the southern par of the basin.
Siltation is particularly strong in
culture areas where two feet high
metallic structures produce heavy sediment deposition. However, the quantification of
this phenomenon remains very approximate and tools are needed to prioritize dredging
and cleaning operations.
The 1985 depth survey was processed with geostatistics exactly the same way
as described above for the 1994-96 survey. By subtracting the two situations, a
difference map was obtained and transformed into a grid file in ArcView. Using the
operation applied to the bank file, it is possible to display the average
sediment balance per bank. Fig. 5 denotes an almost homogeneous accumulation of