We examined the relations of the channel distribution with the sedimentary facies in Geunso-bay
tidal flat, Korea. The tidal channel networks were extracted from an aerial photograph. The patterns of the
channel distribution were compared with one another for several sites in terms of the fractal analysis, channel
density. The channels in each sediment facies showed relatively constant meandering patterns, however, the
density and the complexity were distinguishable for each facies. The 2nd fractal dimension which indicates the
branch pattern of the tidal channel were 1.87 in the mud flat, 1.41 in the mixed flat, and about 1.30 in the sand
flat. The channel density in the mud flat was 0.035-0.06 m/m2 which was the highest among the three
sedimentary facies.
Using the differences in fractal dimensions and tidal channel densities in each sedimentary facies, we tried
to adjust the sedimentary facies classification which had been generated from the interpolation of the surveyed
data. For each grain size sampling site, the percentage of sand particles was compared with the channel density.
It was shown that the higher the sand percentage, the lower the tidal channel density except at a few points. The
locations showing the exceptional pattern were mainly inside the tidal channel or adjacent to the inland. We
suggest that those differentiated features of tidal channels among the different sedimentary facies should be
applied to the surface sedimentary facies classification in the tidal flat.
The applicability of remotely sensed data to the detection and monitoring of the seasonal
variation of microphytobenthos distribution in a tidal flat was examined for the Geunso-bay tidal flat in the west
coast of Korean peninsula. The biomass of diatom within the surface sediments was estimated through field
campaigns and the seasonal change in the spectral reflectance of the remotely sensed data was investigated.
Field spectrum data were acquired monthly at the fixed locations for monitoring the microphytobenthos
blooming and comparing with the spectral reflectance of satellite images. Sediments facies was also analyzed
along with the spectral reflectance based on the in situ data, and the spectral characteristics of the area where
microphytobenthos occupied was examined. A medium to low spatial resolution of satellite image was not
suitable for the detection of the surface sediments changes in the study area due to its ambiguity of sediments
facies boundary, but the seasonal changes of benthic distribution could be obviously detected. From this, we
suggest that the study on the distribution of surface sedimentary facies and detailed ecological mapping in a tidal
flat based upon the remote sensing images should consider the seasonal variations of microphytobenthos
distribution which would be included in the spectral characteristics of the satellite images.
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