The PODMT3DMS-Tool, which consists of proper orthogonal decomposition (POD) linked to the Modular Transport 3-Dimensional Multi Species (MT3DMS) code for nitrate simulation in groundwater, is introduced. POD, as a statistical technique, reduces a large amount of information produced by the MT3DMS model to provide the main components of the PODMT3DMS-Tool, i.e., space- and time-dependent terms of nitrate. The low-dimensional components represent time- and space-dependent factors in the aquifer response such as hydraulic, hydrogeological and water quality variables represented in the simulation using the MT3DMS model. The PODMT3DMS-Tool is thus a combined statistical and conceptual model with a simple structure and comparable accuracy to MT3DMS. Practical application of the PODMT3DMS-Tool to the Karaj Aquifer in Iran for a period of 6 years revealed agreement between nitrate concentrations simulated by the PODMT3DMS-Tool and MT3DMS, with a mean absolute error of less than 0.5 mg/L in most parts of the aquifer. Moreover, the PODMT3DMS-Tool needed only about 10% of the calculation time required by MT3DMS. The PODMT3DMS-Tool can be used to predict nitrate concentration in the Karaj Aquifer, while its simplicity also makes it potentially useful for other water resources problems.

介绍了PODMT3DMS工具，该工具由适当的正交分解（POD）组成，该正交分解与链接到地下水中硝酸盐模拟的模块化运输3维多物种（MT3DMS）代码有关。POD作为一种统计技术，减少了MT3DMS模型产生的大量信息，以提供PODMT3DMS-Tool的主要组件，即硝酸盐的时空依赖性。低维分量表示含水层响应中与时间和空间有关的因素，例如使用MT3DMS模型在模拟中表示的水力，水文地质和水质变量。因此，PODMT3DMS-Tool是一个组合的统计和概念模型，具有简单的结构和与MT3DMS相当的准确性。PODMT3DMS-Tool在伊朗Karaj Aquifer油田的实际应用长达6年，表明PODMT3DMS-Tool和MT3DMS所模拟的硝酸盐浓度之间存在一致性，大部分地区的平均绝对误差小于0.5 mg / L。含水层。此外，PODMT3DMS工具仅需要MT3DMS所需计算时间的10％左右。PODMT3DMS-Tool可用于预测Karaj含水层中的硝酸盐浓度，而它的简单性也使其可能对其他水资源问题有用。