Granularity Analysis of Superficial Sediments of Spartina Alterniflora Salt Marsh on South Coast of Hangzhouwan Bay

The formation of Spartina alterniflora salt marsh has great influence on hydrodynamic status,depositional characteristic and evolvement process of topography on tidal flats.The paper discussed the granularity of superficial sediments of Spartina alterniflora salt marsh on the south coast of Hangzhouwan bay.The results show that the sediments types on the marsh are composed by clay-salt,salt,salt-sand and sand-salt.From east to west,Md becomes greater while σ1 becomes worse.From low flat to high flat,Md increases gradually,but sorting becomes worse.The out boundary of salt marsh is the break spot of Md and σ1.The results also show that the sediments are mainly composed by leap load.Md of leap load,bed load and suspended load become finer from low flat to high flat.