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氮是一种中国西北地区水资源的主要污染物 ,其污染地下水的主要途径是通过排放的生产和生活废水的垂直渗透。本研究利用系统规划模式 ,通过对嘉峪关市的土地处理系统的可行性研究 ,我们提出了一个对水流和氮的迁移与转化的二维模型 .该模型从总体上综合了饱水带与包气带区域的特点 ,所建立的模型结合存在于土层中的氮转化理论 ,如矿化作用 ,固化作用 ,淋滤作用 ,硝化和反硝化作用 .整体模拟是在耦合所有子模型的基础上建立的 ,主要用于模拟铵氮和硝氮从表土层向潜水层含水层的迁移 .污染系统在垂向可分为三层 :耕作层 ,下包气带和含水层 .在利用系统动力学平衡基础上 ,整体模型的求解便转变为对一组偏微分方程的求解 .通过模拟预测数据与实测的数据的对比 ,证明了该模型能够可靠的模拟出氮的各种形态在土壤和地下含水层中的迁移与转化规律
Nitrogen is a major pollutant of water resources in Northwest China. The main way of polluting groundwater is through vertical production of discharge and vertical infiltration of domestic wastewater. Based on the feasibility study of land treatment system in Jiayuguan City, this study proposed a two-dimensional model of water flow and nitrogen migration and transformation, With the characteristics of the region, the established model combines the nitrogen transformation theory existing in the soil layer, such as mineralization, solidification, leaching, nitrification and denitrification. The overall simulation is based on the coupling of all sub-models , Mainly used to simulate the migration of ammonium and nitrogen from the topsoil to the aquifers in the aquifer.The pollution system can be divided into three layers in the vertical direction: tillage, sub-aerate and aquifer.In the system dynamics equilibrium Based on which the solution of the global model is transformed into the solution of a set of partial differential equations.The comparison between the simulated prediction data and the measured data proves that the model can reliably simulate various forms of nitrogen in the soil and underground aquifers In the migration and transformation rules