雷州半岛东岸地下水化学要素变化以及海水入侵特征

Characteristics of Groundwater Chemical Elements Variation and Seawater Intrusion in East Coast of Leizhou Peninsula

对位于雷州半岛东岸的测井进行小潮、大潮期取样测试,对数据进行整理分析。结果显示,化学要素含量及变化特征随潮期、测井位置而变化,J1测井具有离子含量高,变化幅度小,J2测井则具有含量相对要低,但变化剧烈的特征,与测井所处地质环境有关;Na+、Cl-为主导成分,要素平均含量序列遵循良好的指数率,J2测井HCO3-含量比J1测井要高,要素之间的相关性也明显要好;J1测井潮周期氯化物水质均为V类,J2测井为III～V类,Cl-、Br-、溶解性固体总量海水入侵等级均为IV等级,J2测井为I～IV等级,结合其它指标均表明地下水海水入侵明显。

By analyzing survey data of monitoring wells in east coast of Leizhou Peninsula during neap tide and spring tide, characteristics of groundwater chemical elements variation and seawater intrusion are studied in this pa- per. The result shows that chemical element concentration varies with tidal period, location of wells and surrounding environment. J1 well has the characteristics of high ion concentration and relatively low variation while J2 is with relatively low ion concentration and strong variation. Na＋ and C1 are major components and the alignment of chemical elements average content is in good exponential fitness. However, J2 well has better correlation between elements because of its higher HCO^- concentration. According to the average concentration of chloride in two tidal period, water quality of J1 well is identified as Type V while it of J2 well are Type III to V. Aeeording to the con- centration of C1 , Br and dissolved solids, grade of seawater intrusion in J1 is Grade IV, while it in J2 are Grade I to IV. All data indicate that seawater intrusion in groundwater is serious.