SEDIMENT BALANCE OF THE VISTULA LAGOON

2017 ◽  
Author(s):  
Vladimir Chechko ◽  
Vladimir Chechko ◽  
Boris Chubarenko ◽  
Boris Chubarenko
Keyword(s):  
Baltic Sea ◽  
Field Measurements ◽  
Water Volume ◽  
Critical Element ◽  
Vistula Lagoon ◽  
The Baltic Sea ◽  
Direct Measurements ◽  
Biogenic Components ◽  
The Baltic ◽  
The Vistula Lagoon

Vistula Lagoon is the second largest lagoon in the Baltic Sea with maximum depth 5.2 m and average depth 2.7 m. Water volume and area are 2.3 km3 and 838 km2. Lagoon is connected with the Baltic Sea by single inlet 400 m wide and 10-12 m deep. Sediment budget estimation were made using literature sources, results of field measurements (hydrology, suspended sediment content, upper layer sediment structure, direct measurements of sedimentation in summer and winter conditions). The budget for terrigene and biogenic components of sediments were made, considering their contributions from the rivers, inflow from the Baltic Sea, coastal erosion and aerial flux, biological production within the lagoon, totally - ca. 730 thousands ton per year. Nearly half of total gain is washed out (105 and 244 thousands ton per year of terrigene and biogenic components), another half is dissolved and mineralized (biogenic component), and only 10% is deposited on the bottom, resulting in rather low sedimentation rate - 0.4 mm/year during last 100 years. Paper explain the reason of difference with estimation made in (Chubarenko&Chubarenko, 2002) and concludes that the clarification of estimates of the amounts of sediments transported from the lagoon to the Baltic Sea is a critical element for understanding the evolution of the Vistula Lagoon as a sedimentation system.

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