节点文献
岩溶地下河水化学对城镇化进程的时序响应
Temporal Response of Subterranean Karst Stream Hydrochemistry to Urbanization
【摘要】 利用25年地下水观测与遥感解译数据研究地下河对城镇化进程的水化学时序响应,结果表明,随着城镇化的进行,地下河的矿化度逐渐上升;水化学类型时序演变从枯水期单一的HCO3·SO4-Ca·Mg型和丰水期HCO3-Ca·Mg型向HCO3·ClCa型、HCO3·SO4-Ca型、HCO3-Ca和HCO3·SO4-Ca·Mg型等多类型演化,快速城镇化时期水化学类型多变.受地表降水输入影响,地下河枯水期与丰水期[Mg2+]/[Ca2+]和[HCO3-]/[SO42-](摩尔比)变化较大,城镇化前地下河水化学受水岩相互作用、农业活动和酸雨入渗共同影响,两者均值分别为0. 86和29. 34; 2001年城镇化后农业活动和酸雨输入贡献减少,丰水期城镇化输入(居民生活和工业排污)明显增加,两者出现突变特征,分别降低至0. 38与6. 01. 1990~1995、1996~2010和2011~2015年不同时期的主要地球化学敏感阳离子分别为Ca2+及Mg2+、Na+和NH4+,阴离子则分别为HCO3-、HCO3-及SO42-和Cl-.地下河对城镇化进程的水化学响应具有明显的阶段性和时序性.
【Abstract】 The hydrochemical responses of underground rivers to urbanization were studied using a 25-year groundwater observation dataset and remote sensing. We found that as urbanization progresses,the mineralization degree of underground rivers gradually increases; time-series data for dominant hydrochemical indicators changed from HCO3·SO4-Ca·Mg during the dry season and HCO3-Ca·Mg during flood season to HCO3·Cl-Ca,HCO3·SO4-Ca,HCO3-Ca,and HCO3·SO4-Ca·Mg. Influenced by surface precipitation input,the groundwater chemistry of underground rivers varies greatly during the dry season and the flood season. Prior to urbanization,[Mg2+]/[Ca2+]and [HCO3-]/[SO42-] molar ratios are affected by water-rock interactions,agricultural activities,and acid rain infiltration,the average values of which were 0. 86 and 29. 34,respectively. After urbanization,agricultural activities and the contribution from acid rain decreased gradually. During the periods 1990-1995,1996-2010,and 2011-2015,the main sensitive geochemical cations were Ca2 +,Mg2 +,Na+,and NH4+,and the main anions were HCO3-,HCO3-,and SO42-,and Cl-. The hydrochemical response of underground rivers to urbanization was characterized by clear temporal phases.
【Key words】 subterranean stream; urbanization; hydrochemical responses; geochemical sensitivity; Guiyang;
- 【文献出处】 环境科学 ,Environmental Science , 编辑部邮箱 ,2019年10期
- 【分类号】P641.3;F299.21
- 【网络出版时间】2019-05-28 11:13
- 【被引频次】1
- 【下载频次】193