Discrepancy in transmissometer results could also be due to air b

Discrepancy in transmissometer results could also be due to air bubbles originated by water organisms. Bunt et al. (1999) and Campbell et al. (2005) reported the significance of air bubbles to the response of the optical backscatter devices. They reported that air bubbles can double

the response of the device. In addition to the errors that resulted from the measuring device, the discrepancies between the field data and the model results can be caused by improperly defined input data, namely the sediment features or the model tuning parameters. It should also be mentioned that Delft3D is incapable of simulating the interaction between the individual fractions, especially between sandy fractions and the mud. The use of a constant settling velocity for the whole area and for the whole tidal cycle can be counted as another Trametinib model limitation. This is the limit associated with the Delft3D modeling

which does not allow the use of variable values of settling velocities over the area. According to Winterwerp (2001) there are large variations in the value of the settling velocity having the higher values around the slack water mainly due to flocculation of sediment. His conclusion is that flocculation is a factor that explains why it Selleck Lumacaftor is not possible to simulate the observed features in suspended sediment concentrations properly using constant settling velocity. Talke and Swart (2006) also emphasized the necessity of considering variation of the settling velocity during a tidal cycle in order to simulate the behavior of the suspended sediment. In their investigations they showed that biological matters and turbulence processes play an important role in the variation of the settling velocity during a tidal cycle. Considering constant settling velocity for the tidal channel and the tidal flat can affect the results in a way that the model could not properly simulate the amount of sediment washed out from

the land and the tidal flat areas through the channel during the ebb conditions because of the insufficient supply of sediments. This is applicable specifically to the cross-section T2 due to its proximity PD184352 (CI-1040) to tidal flats and the water-land interactions (see Fig. 4). The SSC values obtained from the model during ebb condition show mostly underprediction for this cross-section. I thank Prof. Dr. Roberto Mayerle for his supervision and full support during my Ph.D. research, who challenged me to produce my best work. This paper is part of that research which has been carried out in Coastal Research Laboratory of Kiel University, Germany. I, therefore, would like to express my special thanks of gratitude to the staff of this university. “
“The bio-optical relationships linking optical properties of the ocean to chlorophyll-a concentrations (Chl) have been the focal point of numerous studies in the last three decades (Bricaud et al., 1995, Mobley, 1994 and Morel, 1988).

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