【摘要】 涞源西部山区为拒马河发源地,分析涞源西部地下水化学特征及其成因对河北省和北京市用水安全具有重要意义。通过地下水特征统计,Piper三线图、Gibbs图以及离子比值法,得出涞源西部地下水pH为7.3～8.4,属于中性或弱碱性。机井与泉水水样点TDS为226～604mg/L,地下水类型主要为HCO₃-Ca·Mg和HCO₃-Mg·Ca型。Gibbs图揭示了区内地下水主要离子组分受岩石风化作用控制。Na⁺离子含量低,分析认为:区内白云岩和灰岩饱和致使地下水中的Mg²⁺及Ca²⁺置换出Na⁺,使地下水中Na⁺含量偏低;区内存在大量的灰岩,其水解为地下水提供了更多的Ca²⁺;较高的ρ(Mg²⁺)/ρ(Ca²⁺)值以及较低的ρ（Na⁺）/ρ(Ca²⁺)值,表明地下水中白云岩的风化溶解多于灰岩。人口聚集区W-14北石佛为代表的涞源盆地地区,氮元素含量超过其他区域,指标均未超过地下水质量非常规指标及限值的第三类。更多还原

【Abstract】 The causes western groundwater mountainous in area western of area Laiyuan of is Laiyuan the is source great of Juma significance trigram,River.to The the analysis water of security and the of chemical Hebei characteristics Province and Beijing.of According the the of and characteristics,method,TDS to the statistics groundwater of the springs groundwater west Piper Gibbs neutral diagram weakly ion alkaline.ratio The it water is concluded sample that points7.3～8.4,mg/L,pH of in that analysis of were Laiyuan226～604main is which the is or types the of of HCO3-Ca·Mg HCO3-Mg·Ca.mechanical Gibbs wells diagram and reveals The and of groundwater groundwater were are mainly controlled area and weathering.the shows and ion the components saturation in area by the limestone rock The Na⁺content Mg²⁺by of and hydrolysis Na⁺Ca²⁺is in provides weathering low.that content groundwater.of dolomite groundwater and is limestone low.in There the are causes of Replacement of area,value,groundwater,Na⁺Higher the the of in a low content areas,lot in the whose indicate Basin,ρ(mg²⁺)/ρ(Ca²⁺)dissolvingρ（Na⁺）/ρ(Ca²⁺)of Ca²⁺more of for dolomite value and The other that the in in groundwater population in than is limestone.higher nitrogen the in indexes the do Laiyuan not represented third area,W-14by of North Shifo the indexes gathering groundwater than and exceed the category unconventional and limits of quality.更多还原