松嫩平原哈尔滨地区地下水环境背景值分析

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。

Background Values of Groundwater Environment in Harbin Area of Songnen Plain

A ffected by n a tu ra l c o n d itio n s a n d h u m a n a c tiv itie s ,th e g ro u n d w a te r e n v iro n m e n t h a s c h a n g e d a lot. T h e g ro u n d w a te r p o llu tio n p ro b le m s h a v e b e e n p a id w id e a tte n tio n . It is v ery im p o rta n t fo r th e g ro u n d w a te r p o llu tio n e v a lu a tio n to d e te rm in e th e b a c k g ro u n d v a lu e e x a c tly . T h is p a p e r p ro v id e d th e a n a ly sis o f 150 g ro u p s o f g ro u n d w a te r c h e m ic a l s a m p le s in th e H a rb in a re a o f th e S o n g n e n p la in . By th e a n a ly s is o n th e reg io n al flow field a n d s u p p ly ru n o ff c o n d itio n ,th e m a th e m a tic a l s ta tis tic s m e th o d a n d e x - p e rie n c e m e th o d w e re a p p lie d to c a lc u la te th e g ro u n d w a te r e n v iro n m e n t b a c k g ro u n d v a lu e s o f th e u n c a n fin e d w ater a n d c o n fin e d w at(*r.T hen, th e c o m p a riso n w as m a d e on ih e re s u lts o b ta in e d from th e two m e th o d s. 1 h e re s u lts show th a t th e m a th e m a tic a l s ta tis - tic s m e th o d is b a se d o n th e c o m p re h e n s iv e effect o f th e n a tu ra l g e o g ra p h ic a l e n v iro n m e n t a n d lo n g - te m i h u m a n a c tiv itie s , w h ich ctm o v e re m n e llie sh o rtc o m in g s o f e x p e r ie n c e m e th m h a m i it c a n a lso tm th fu lly re fle c t th e h a( kgr(m iul th e stu d y a re a . T h e b a c k g ro u n d v a lu e s o f N 0 3 , F e a n d Mn in p h re a tic w a te r a n d F e a n d M n in c o n fin e d w a te r in th e a r e a a re h ig h . T lie g ro u n d w a te r e n v iro n m e n l b a c k g ro u n d v a lu e s a re clo se ly re la te d w ith h u m a n arliv ilit? s, re c h a rg e , n m o ff. d ra in a g e a n d se d imentai*y c o n d itio n s o f th e g ro u n d w a te r in th e a re a .