论地下水环境评价中初始流场模拟

Simulation of initial flow regime in groundwater environmental assessment.

对于许多区域环境评价问题，地下水水流模拟和水质模拟往往采用数值方法，需给出每个节点上初始流场值，以反映流场的初始状态。文中阐述了地下水初始流场模拟的趋势面加残差方法原理，以河南省焦作市修武段地下水数值模拟分析区为例，分析了用一次、二次趋势面加残差方法模拟地下水初始流场对观测点水位的拟合情况和对真实流场特征的反映情况。指出在进行地下水初始流场模拟时不可片面追求趋势面的次数高、对观测点水位拟合效果好，而应注重其对初始流场特征的反映情况。

In many cases of regional EIA, numerical method is often adopted in groundwater flow modeling with water quality modeling with initial flow regime value on each node needs to be given to reflect the initial flow regime. The principle of trend plus residual method adopted in initial groundwater flow simulation is presented in this paper with a case study of numerical modeling of groundwater in Xiuwu county, Jiaozuo city, Henan province. In the case study, the result of simulating initial groundwater flow regime with one order and two order trend plus residual method to water head on observing nodes is analyzed;and the extent to reflect the actual initial flow regime characteristics is shown. It indicated that for initial groundwater regime simulation,importance should not be attached only to higher order trend or better effect;but should be attached to the extent reflecting initial flow regime characteristics.