Sediment oxygen demand rate in a flow regulated lagoon (Venice, Italy)

From October 2020, the MOSE system went into operation in three inlets to protect Venice and its lagoon from flooding caused by high tide events Adriatic Sea. While increases prospect of physical defense, how will new status a regulated affect functioning waterbody? In particular, dissolved oxygen balance water column can be affected expected increase residence times. Sediments play an important role consumption for this reason sediment demand (SOD) was studied situ first time, 16 sites at four areas. SOD rate, measured throughout 2021 with specially made benthic chambers, varied different areas seasons (from 0.63 24.00 g m −2 d −1 ), higher values more confined significantly lower those belonging open lagoon. Based on times were estimated closures, saturation hypoxia temperature range 11.7–33.3°C. Especially sites, sediments exert depleting action already temperatures above 20°C, which are not particularly