典型暴雨农业面源总磷入库水质影响过程

以东北大伙房水库为典型研究案例，根据典型暴雨情况下农业面源中总磷入库的时间变化特征，建立考虑入库水流影响的库区三维水动力数学模型及相应的三维水质模型，模拟分析1次典型暴雨入库过程中库区总磷三维空间分布及随时间变化的特征。模拟结果表明，受入库流量和丰水期主导风向东北风的影响，总体上总磷随着水流主要沿西南岸线向坝址方向扩散，总磷浓度超标面积逐渐增大，随着流程增加，其浓度逐渐减小。对面源入库过程的模拟分析可以为面源污染的预报及治理提供相关的技术依据。

Water quality effects of agricultural non-point source total phosphorus input into reservoir in a typical rainstorm

According to the time-varying characteristics of agricultural non-point source total phosphorus （TP） input into the Dahuofang Reservoir, in the northeastern area of China, for a typical rainstorm case, we established a three-dimensional hydrodynamic mathematical model and the corresponding three-dimensional water quality model, taking into account the influence of the flow into the reservoir, in order to simulate and analyze the three- dimensional spatial distribution and time-varying characteristics of TP in the reservoir area during a typical rainstorm storage process. The simulation results show that, under the influence of the inflow and the northeasterly wind direction, which was the dominant wind direction in the wet period, TP diffused towards the dam site along the southwest coastline, the TP-exceeded area increased gradually, and the concentration of TP decreased with the flow process. The simulation analysis of this process can provide a relevant technical basis for the forecast and control of non-point source pollution.