Cyclical variability of suspended sediment concentration over a low-energy tidal flat in Jiaozhou Bay,China: effect of shoaling on wave impact |
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| Authors: | S L Yang P Li A Gao J Zhang W X Zhang M Li |
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| Institution: | (1) State Key Lab of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China |
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| Abstract: | During the spring-neap period of 17–24 August 2004, turbidity, horizontal and vertical current velocities and echo intensity
were measured using OBS-3A and ADP-XR instruments over an intertidal flat within the semi-enclosed Jiaozhou Bay, China, to
examine patterns in suspended sediment concentration (SSC) and possible control factors. SSC was found to be lower than 30 mg
l−1 in most of the water column and for most of the tidal cycle. This is attributed mainly to the low hydrodynamic energy, in
particular weak currents (near-bottom maximum 1- and 8-min-interval velocities were only 26.1 and 14.2 cm s−1, respectively), and limited fine-grained sediment supply by rivers. However, high SSC values ranging from 100 to >1,000 mg
l−1 occurred over short periods at the beginning and the end of inundation. This phenomenon is attributed to the shoaling effect
of frequent wind-generated waves, as a result of which near-bottom SSC fluctuations display a U-shaped trend during each tidal
cycle. |
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