The results showed that heavy metal appeared inverted "W" on longitudinal distribution characteristics in the trunk stream .
结果表明：在主干流河道的顺流断面中，各种重金属元素整体上表现出明显的倒“W”型分布。
2
Once the aquifer disconnect from the stream, the inverted saturated zone of the rectangular streambed show a hemicycle, and that of rectangular streambed show a vertical rhombus.