摘要
广西北海市滨海平原分布有低矿化度（小于200mg/L）的潜水和承压水,天然状态下地下水的pH值为3.33～7.0,平均值为5.12,其中潜水3.67～7.0,平均值5.17;承压水3.33～6.97,平均值5.07.地下水的pH值没有显著的上升或者下降,部分监测孔有一定的波动,一般在丰水期要略高于枯水期.总体上,雨水的pH值高于潜水,潜水的pH值又略高于承压水,自内陆地区向海边,地下水的pH值呈略减小趋势.pH值较低的大气降水入渗补给和具有多层结构的越流含水系统,有利于这一地区偏酸性地下水的分布.
Groundwater with low total dissolved solids （less than 200 mg/L） occurs in the phreatic and confined water near Beihai of Guangxi. Under natural conditions the pH in groundwater ranges from 3.33 to 7.0 with an average value of 5.12.The pH in phreatic water varies from 3.67 to 7.0 with an average value of 5.17 and the pH in confined water is in the range 3.33 ～ 6.97 with an average value of 5.07. The pH in the groundwater does not show significant increasing or decreasing trends. Fluctuations in pH exist at some of mon- itoring wells and the pH in groundwater is a bit higher in rainy season than in dry season. Monitoring data show that the pH in rainwater is higher than in groundwater in phreatic water, whereas the pH in the latter is a bit higher that in the confined water. A slight decreasing trend in the pH is also found from inland area to coastal zone. The occurrence of the weak acidic groundwater in this area is attributed to the recharge from low pH precipitation and the multi-aquifer and leaky groundwater system
出处
《勘察科学技术》
2006年第5期46-50,共5页
Site Investigation Science and Technology
基金
国家自然科学基金项目(40172087
40214009)资助
