松嫩平原哈尔滨地区地下水环境背景值分析

Background Values of Groundwater Environment in Harbin Area of Songnen Plain

受自然条件及人类活动的影响,地下水环境发生了较大的变化,地下水污染问题日益引起广泛的关注。正确确定背景值对地下水污染评价十分重要。以收集的松嫩平原哈尔滨地区150余组地下水水化学样品分析数据为依据,在分析区域流场、补给径流条件的基础上,选用数理统计法和经验法求取了研究区潜水和承压水地下水环境背景值,并对地下水环境背景值进行比较。结果表明:数理统计法以自然地理环境和人类长期活动的综合作用为基础,克服了经验法的不足,可较真实地反映研究区地下水背景状况;研究区内潜水中指标NO3-、Fe、Mn和承压水中指标Fe、Mn均为高背景值指标;区内地下水环境背景值与人类活动、地下水的补、径、排和沉积环境条件具有密切的关系。

Affected by natural conditions and human activities,the groundwatcr environment has changed a lot.The groundwater pollution problems have been paid wide attention.It is very important for the groundwater pollution evaluation to determine the background value exactly.This paper provided the analysis of 150 groups of groundwatcr chemical samples in the Harbin area of the Songnen plain.By the analysis on the regional flow field and supply runoff condition,the mathematical statistics method and experience method were applied to calculate the groundwater environment background values of the unconfined water and confined water.Then.the comparison was made on the results obtained from the two methods.The results show that the mathematical statistics method is based on the comprehensive effect of the natural geographical environment and long-term human activities,which can overcome the shortcomings of experience method.and it can also truthfully reflect the background conditions of groundwater in the study area.The background values of NO3^-.Fe and Mn in phreatic water and Fe and Mn in confined water in the area are high.The groundwater environment background valuesare closely related with human activities,recharge,runoff,drainage and sedimentary conditions of the groundwater in the area.