5.5 m 



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1.83m 



Figure 24-2. Diagram of One of the MERL Tanks. 



NOTE: Each fiberglass tank is insulated and has three flanged ports on the side 

 and one drainage port. The sediment container, also of fiberglass, contains 

 about 30 cm of sediment. The tanks are filled through a port on the side and 

 water exits from about 1 m below the surface through a level-control stand 

 pipe. The depth of water is about 5 m. The mixer moves vertically through an 

 excursion of about 60 cm with a frequency which is variable but is now set at 

 about 5 cycles per minute. 



Table 24-1. Characteristics of MERL microcosms 



Tank interior diameter, 1.83 m 

 Tank interior height, 5.49 m 

 Surface area, water, 263 m 

 Depth of water, 4.98 m 

 Volume of water, net, 13.0 m 

 Salinity, 30 o/oo 



Mass of water, 13.3 tons 

 Area sediment, 2.52 m 

 Depth of sediment, 0.30 m 

 Volume of sediment, 0.756 m 

 Mass of sediment (wet), 1.10 tons 

 Mass of sediment (dry), 0.568 tons 



365 



