关键词: 水源地;典型水文条件;入江支流;不同形态磷;通量阈值;秦淮新河;滁河;长江南京段;

Abstract: On the basis of meeting the water quality objectives of the Changjiang River water source and reveal the phosphorus flux thresholds with different forms in the tributaries to the Changjiang River and the main influencing factors under typical hydrological conditions, this paper took the Qinhuaixinhe River and Chuhe River as research objects, combined with the on-site monitoring data, a two-dimensional hydrodynamic water quality model was constructed.The results showed that: under the influence of rainfall events, the fluxes of particulate and dissolved phosphorus in the tributaries reached the peak at the time of maximum rainfall, and the fluxes of particulate and dissolved phosphorus in the abundant water period were significantly higher than that in the normal water period and the dry water period.The flux thresholds of particulate phosphorus, dissolved phosphorus and total phosphorus were 418.25,163.92 kg/d and 582.17 kg/d respectively in the abundant water period of Qinhuaixinhe River; and the flux thresholds of particulate phosphorus, dissolved phosphorus and total phosphorus were 338.08,144.78 kg/d and 482.85 kg/d respectively in the abundant water period of Chuhe River.The sensitivity analysis showed that the water quality boundary conditions had a more significant effect on the flux thresholds of different forms of phosphorus in the tributaries to the Changjiang River.

Key words: water source; typical hydrological condition; tributary into river; different forms of phosphorus; flux threshold; Qinhuaixinhe River; Chuhe River; Nanjing Reach of Changjiang River;