Study On The Temporal And Spatial Variation Of Water Quality In Rivers On The Upstream Of Miyun Reservoir

Representative water monitoring stations located by GPS are set in Chaohe,Baihe, Anchungou and Qinghshuihe rivers following the standard of setting and sampling of surface water,The temporal and spatial variation is analyzed from the water data.The result is as follows:1 the loads of pollutants of Miyun Reservoir are different in riversThe water quality parameters and flow are analyzed which are from the stations near to the reservoir of the Chaohe,Baihe, Anchungou and Qinghshuihe.We get the result :the total nitrogen and phosphorus loads of Miyun reservoir are mainly from Chaohe and Baihe River,and qingshuihe is less, meanewhile,so are COD and EC.The average total nitrogen concentration of Chaohe,Baihe and Qinghshuihe in the whole year is separately 5.09 mg/L,2.05 mg/L and1.47 mg/L,total phosphorus is 11.54μg/L,12.84μg/L and 4.75μg/L,COD is 5.8 mg/L,7.4 mg/L and 7.8 mg/L,EC is 320μs/cm,250μs/cm,258μs/cm.2 main pollution sources of the upstream in Miyun ReservoirWe make sure the main pollution sources by monitoring the rivers. Firstly , Agriculture activities are the important pollutant resources especially in Chaohe River, as the concentration of total nitrogen ,nitrate total phosphorus,EC and COD is higher, which is separately 5.09 mg/L,4.86 mg/L,11.5μg/L and 5.8 mg/L.Secondly, the waster water of city is also an important pollution resource.The concentration of total nitrogen ,nitrate, total phosphorus,EC and COD is separately 41.99 mg/L,1613.24μg/L ,213 mg/L and 1007μs/cm, and total nitrogen is mainly composed of organic nitrogen.Thirdly, fish culture of Qinghshuihe is also an pollution source.The concentration of total nitrogen,nitrate,total phosphorus,ECand COD separately is 1.92 mg/L,1.74 mg/L,19.67μg/L and 327μs/cm.3 temporal and spatial variation of water quality of riversTemporal and spatial variation of water quality of rivers is analyzed from the monitoring data. It's different among the rivers. Total nitrogen, phosphorus and EC are lower in Summer, and higher in other seasons, but the month is different because of the difference of basin. Because the dilution of rainfall and absorb of plants, the concentration is lower.The concentration of total nitrogen, nitrate in Anchungou river is higher than others, especially in statons 1, and its concentration is higher in the whole year.Because it mainly comes from the run off of fertilization.The concentration of total nitrogen, nitrate in Chaohe river is higher than Baihe, as the Chaohe's agriculture activities,while the COD in Baihe is higher than Chaohe river,as the inhabitation .The total nitrogen,nitrate,COD and EC are lower than other rivers,as the Qingshuihe is mainly covered with mountains,and it has less agriculture activities.