Abstract：Based on the 5 rainfall processes and 2normal discharge events monitored from July to December in 2009at the Ma du-wang section on the Bahe River, impact of nonpoint source pollution (NPS) on water quality of the Bahe River was analyzed. The results indicate that: (1) concentrations of COD, TN, NH3-N, NO3--N, NO2--N and TP in the rainfall processes were lower than those in normal discharge events. (2) The load transport rate of each pollutant gradually increased up to peak value and then started to drop, which was in accordance with the process of flow change. Concentrations of COD, NO3--N and TN increased initially and then decreased, while those of NH3-N and NO2--N decreased first and then increased, change pattern for concentration of TP was not obvious. The peaks of concentration and load transport rate of TN and NO3--N occurred either close or behind the flow peak, while those for TP and NH3-N in the opposite trend. COD concentration peaked close or behind the flow peak, but its load transport rate peaked prior to the flow peak. Changes for NO2--N concentration werenot obvious and its load transport rate peak was close or prior to the flow peak. (3) The estimation of NPS pollution load by mean concentration method indicated that NPS pollution load of COD, TP, TN and NH3-N of the Bahe River in the year of 2009were 8707.28t, 43.07t, 723.63t and 245.52t. (4) The NPS pollution load proportions of COD, TP, TN and NH3-N of the Bahe River in the year of 2009 were 31.86%, 34.42%, 32.69% and 42.21%. Therefore, NPS pollution accounted for a large proportion of the total pollution loads of the Bahe River, which shouldn’t be ignored.
秦耀民, 李怀恩. 基于降雨事件监测的非点源污染对灞河水质的影响[J]. 中国环境科学, 2014, 34(5): 1173-1180.
QIN Yao-Min, LI Huai-恩. Impact of nonpoint source pollution on water quality of the Bahe River based on rainfall events monitor. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(5): 1173-1180.
