Huang Lei, Fang Hongwei, Fazeli Mehdi, Chen Yishan, He Guojian, Chen Daoyi
State Key Laboratory of Hydro-science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Hydro-science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China.
Chemosphere. 2015 Sep;134:374-9. doi: 10.1016/j.chemosphere.2015.05.009. Epub 2015 May 15.
The mobility of phosphorus (P) induced by sediment resuspension have been examined in a circulated flume. During the flume run, the water level and velocity were monitored, and water samples were taken for measurement of sediment and P concentrations. Peak values of both the P and sediment concentrations existed at x=4m, and then decreased slightly along the flume due to deposition. A faster P release was observed for coarser sediment, while a more sustained P release for finer sediment. Combining with the measured data from Yangtze River and sorption experiment, the relation between the load of total P (LTP) and sediment load (Qs) was estimated, and the expressions of distribution coefficient Kd and the concentration of particulate P (PP) were obtained. This study established a bridge between the small-scale sorption experiment and the field observation of natural scale, providing references for the management of contaminated sediment in natural rivers.
通过循环水槽研究了沉积物再悬浮引起的磷（P）迁移性。在水槽运行过程中，监测了水位和流速，并采集水样测量沉积物和磷浓度。磷和沉积物浓度的峰值均出现在x = 4m处，随后沿水槽因沉积而略有下降。较粗沉积物的磷释放速度更快，而较细沉积物的磷释放更持久。结合长江实测数据和吸附实验，估算了总磷负荷（LTP）与沉积物负荷（Qs）之间的关系，得到了分配系数Kd和颗粒态磷（PP）浓度的表达式。本研究在小规模吸附实验和天然尺度的现场观测之间架起了一座桥梁，为天然河流污染沉积物的管理提供了参考。
