辽河三角洲地下潜水现状及变化规律研究

在辽河三角洲地区,布设10个地下水监测点,通过3年的动态监测,得到第四系孔隙潜水水质动态变化规律.辽河三角洲地区地下水矿化度普遍较高,范围介于1~31 g/L.西部山前倾斜平原,地下水矿化度较小,水质较好.南部滨海低平原区,矿化度介于12~31 g/L,地下水为盐水.东北部冲积平原区地下水矿化度介于1~3 g/L,为微咸水.在地下水化学类型方面,HCO_3-Na型地下水主要分布于西部山前倾斜平原区;Cl-Na型地下水主要分布在南部滨海低平原地区;Cl-Na·Ca型地下水主要分布在北部和东部的冲积平原区;HCO_3·Cl-Na型地下水主要分布在东北部的冲积平原区.山前倾斜平原地区,地下水水质基本保持着良好的状态,大部分地区水质变化不大.南部低平原区,Cl~-、SO_4、Na~+及矿化度持续升高,高矿化度、氯化物型和钠型水分布面积增大,向周边扩散.北部冲积平原地区,地下水的各组分及矿化度略有起伏,变化不大并趋于稳定.

STUDY ON THE PRESENT STATUS AND CHANGING REGULARITY OF THE GROUNDWATER IN LIAOHE DELTA

The dynamic changes of the Quaternary pore groundwater quality in the Liaohe Delta are obtained from 10 monitoring sites for three years.The result shows that the mineralized degree of the groundwater is generally high,ranging from 1 to 31 g/L.In the western piedmont plain,the water quality is good,with low salinity.While in the area of southern coastal low plain,the groundwater is brined,with salinity between 12 and 31 g/L.The mineralized degree of groundwater in the east and north alluvial plain ranges from 1 to 3 g/L,as brackish water.In respect to the groundwater chemistry type,the HCOrNa type is mainly distributed in the western piedmont plain;the Cl-Na type,in the southern low-lying coastal areas;the Cl-NaoCa type,in alluvial plains in the north and east;while the HCO3·Cl-Na type,in the northeast alluvial plain.The groundwater quality in the sloping piedmont plain is in good status,with rare changes in most areas.In the southern low plain,the contents of Cl-,SO42-and Na + as well as salinity keep increasing.The distribution of this type of water is spreading to the surrounding areas.The groundwater components and salinities in the northern alluvial plain fluctuate slightly,with little changes and becoming stable.