莱州湾白浪河河水和河口海水的水化学和氢氧稳定同位素特征

发布时间：2018-05-04 05:04

  本文选题：白浪河 + 河水　； 参考：《水文地质工程地质》2016年05期

【摘要】：在海水入侵的研究中,通常将海水作为一个重要的混合端元。而一般沿海带的海水,尤其是河口海水相对于标准海水都会受到入海河流以及沿海人为活动的强烈影响,在空间和时间上的分布不断在变化。因此在研究海水入侵之前,研究河口海水、标准海水与河水成分之间的混合关系至关重要。本研究主要是对比海水和地表水的稳定同位素和水文地球化学成分。在莱州湾入海河流白浪河的下游沿岸采集5件河水样品,河口采集7件海水样品,对样品进行了水化学和稳定同位素测试,研究淡水和海水的混合关系。采用惰性示踪剂(δD、δ~(18)O、Cl~-、Br~-)和反应示踪剂(Na~+、Mg~(2+)、SO~(2-)_4、HCO~-_3、Ca~(2+)、NO~-_3)展开分析。在δD-δ~(18)O关系图上,所有的河水样品都位于全球大气水线之下,反映了上游水库水的蒸发,海水样品则位于标准海水与河水样品的混合线上。河水样品δ~(18)O—Cl~-关系表明不同程度的溶解了蒸发盐;河水样品的Ca~(2+)、HCO~-_3、SO~(2-)_4与Cl~-的比值反映了CO_2气体、碳酸盐以及硫酸盐溶解。海水样品的Br~-/Cl~-比值与海水比值基本相同,与其它主要离子与Cl~-的关系都表明海水样品源于标准海水与河水的混合。因此当河水和海水混合时,两种水体的溶剂发生机械混合,溶质中海水占主导的化学成分与Cl~-比值都接近海水比值,包括Na~+、Mg~(2+)、SO~(2-)_4、Br~-和Cl~-的比值,而大陆生成的成分在淡水中与Cl~-的比值都会大于海水比值,主要有HCO~-_3、Ca~(2+)、NO~-_3和Cl~-的比值。这种混合机理也适用于地下水。
[Abstract]:In the study of seawater intrusion, seawater is usually regarded as an important mixed end element. In general, the sea water in coastal zone, especially the estuarine seawater, is strongly influenced by rivers entering the sea and coastal human activities, and its spatial and temporal distribution is constantly changing. So it is very important to study the mixing relationship between the standard seawater and the river water composition before the study of seawater intrusion. In this study, the stable isotopes and hydrogeochemical compositions of sea water and surface water were compared. Five samples were collected from the lower reaches of the Bailang River in Laizhou Bay, and seven samples from the estuary were collected. The samples were tested for hydrochemistry and stable isotopes, and the mixing relationship between fresh water and seawater was studied. The analysis was carried out by means of inert tracer (未 D, 未 D) and reaction tracer (Na). In the 未 D- 未 ~ (18) O relation diagram, all the river water samples are located below the global atmospheric water line, reflecting the evaporation of upstream reservoir water, and the seawater samples are located on the mixed line of standard seawater and river water samples. The 未 ~ (18) O -Cl ~ (-) -relationship of river water samples indicates that the evaporative salts are dissolved to varying degrees, and the ratio of Ca~(2 / HCO-3 / C ~ (2 +) to Cl ~ (-) reflects the dissolution of CO_2 gas, carbonate and sulphate. The Br-/ / Cln- ratio of seawater samples is basically the same as that of seawater samples, and the relationship with other major ions and Cl- shows that the seawater samples are derived from the mixing of standard seawater and river water. Therefore, when the water is mixed with seawater, the solvents of the two kinds of water are mechanically mixed, and the ratio of the dominant chemical components in the solute to the Cl ~ (-) is close to that of the seawater, including the ratio of Na ~ (2 +) MgO ~ (2 +) and so _ (2) to the ratio of ~ (4) Br-O ~ (-) and Cl ~ (-). However, the ratios of continental components to CL- in fresh water are higher than those of seawater, and there are mainly the ratios of HCO-3Ca-Cam ~ (2 +) and Cl ~ (-) ~ (3) in fresh water. This mixing mechanism also applies to groundwater.
【作者单位】： 中国地质大学(北京);北京市水文地质工程地质大队;中国地质环境监测院;山东省地质环境监测总站;
【基金】：国家公益性行业科研专项“典型海岸带地质环境监测关键技术与评价方法”(201011019)
【分类号】：P342;P734
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本文编号：1841702