Research on salinity mixing and stratification mechanisms at the Modaomen channel

Based on Simpsons method and observation data of the Modaomen channel in the dry season in 2009, the paper discussed salinity mixing processes and stratification mechanisms with tidal straining, freshwater buoyancy inputs, stirring of wind at upstream and downstream stations. The results are as follows: (1) the impact of freshwater on stratification is weak at the upstream M1 station; and (2) stratification is obvious at downstream M2 station with continuous stratification during neap tide and cycle stratification during middle tide and spring tide, but stratification is strengthened during spring tide because of input freshwater increases. Weak stratification at the M1 station appears only at then maximum current during flood tide. Degree of stratification depends on ratio of Freshwater buoyancy to mixing inducing tide and wind.