海河水环境质量及污染物入海通量

在1993～1997年海河水质监测资料的基础上,计算了各污染因子的污染指数和入海通量.结果表明,海河的污染较严重,各断面的水质等级均在IV级和V级的水平,主要的污染因子为NH₃-N、NO₂-N以及有机物污染.5年间海河的水质有所改善,综合污染指数由1993年的17.21降为1997年的13.39.前4年中污染物的入海通量加大,尤其以COD_Mn、BOD、NH₃-N、NO₃-N和NO₃-N最为严重,分别由1993年的1555、655、337、156和25 t·a^-1上升到1996年8710、4317、2516、1528和188 t·a^-1.而1997年又分别急剧下降至1331、973、572、355和31 t·a^-1,这可能主要是由于海河径流量的变化所引起的.

Quality of Aquatic Environment at Haihe River and the Pollutant Fluxes Flowing into Sea

On the basis of the data of water quality monitored from 1993 to 1997, the pollution indexes of each pollutant was computed. The results showed that the pollution at Haihe river was severe. The rank of water quality at all monitoring site were between IV and V grade. The main pollution factors were NH3-N, NO2-N and organic contaminants. During the 5 years, water quality of Haihe River was improved, however, the pollutant fluxes flowing into Bohai Bay, especially CODMn, BOD, NH3-N, NO3-N and NO2-N, were increased, they were increased from 1555, 655, 337, 156 and 25 t.a-1 in 1993 to 8710, 4317, 2516, 1528 and 188 t.a-1 in 1996, and sharply decreased to 1331, 973, 572, 355 and 31 t.a-1 in 1997, respectively. It may be mainly due to the change of runoff at Haihe River.