当流速为60至70 cm/s时，此时底部淤泥被成片掀起，达到“普遍动”

When the flow velocity is 60 to 70 cm/s, the silt at the bottom is lifted up in pieces and reaches a “universal movement” state. Therefore, the increase in the concentration of each substance reaches the maximum at this time. When the flow velocity is 65 cm/s, the total water body The concentrations of Cu, Cd, and Pb were 196.6 μg/L, 0.27 μg/L, and 6.72 μg/L, respectively, and their contents were 21.37, 2.76, and 3.82 times of those in static water;

When the flow rate is 60 to 70 cm/s, at this time the bottom silt is lifted in pieces, to reach the "universal movement" state, so at this time the concentration of each substance increased to the maximum range, the flow rate of 65 cm/s, the total water Cu, Cd, Pb concentration is 196 .6 sg/L, 0.27 sg/L, 6.72 sg/L, the content is 21.37, 2.76, 3.82 times the hydrostatione state;

When the flow rate is 60-70 cm / s, the bottom sludge is lifted up and reaches the "general dynamic" state, so the concentration of each substance increases to the maximum. When the flow rate is 65 cm / s, the total Cu, CD and Pb concentrations in the water are 196.6 μ g / L, 0.27 μ g / L and 6.72 μ g / L respectively, and their contents are 21.37, 2.76 and 3.82 times higher than those in static water;<br>