Spatiotemporal Variation Characteristics of Water Pollution and the Cause of Pollution Formation in a Heavily Polluted River in the Upper Hai River

Table 1

River water monitoring sites.

River name	Code	Number of monitoring sites	Parameters
Wei	G1, G3, G4, G5, G7, G8	6	Temp, pH, DO, CODCr, BOD5, NH3–N, TP, F^−, CN, VP, Cu, Zn, Pb, Cd, Cr^6+
Communist	G2, G6, G9	3
Dashilao	Z1	1
Yu	Z2, Z3	2
Shimen	Z4, Z5	2
Baiquan	Z6	1
Ximeng	Z7	1
People’s Victory	Z8	1
Dongmeng	Z9	1
Cang	Z10	1