摘要
通过自制三维有机玻璃水槽建立非均质土层,设立浅层和内部两个泄漏点,模拟流动相原油在含水土层中的运移及水位波动条件下的重分布过程,并利用自制高密度电极排及电法仪揭示相应的电阻率响应特征.结果表明:原油在土壤中运移受泄漏源位置、泄漏量及土层结构的影响.同一土层内部泄漏点横向扩散较垂向明显,浅层泄漏点为四周扩散,泄漏量越大污染范围越宽,土层渗透性越高污染深度越深.原油泄漏后存在高阻和低阻异常2种情况,土层结构简单且含油率较高时高阻异常明显;土层组分较复杂尤其是盐分和粘土矿物含量较高,或含水率和含油率较低时,易出现低阻异常.水位升高后土层整体电阻率降低,原油向污染区中心集中;水位下降后电阻率升高,原油向四周分散,水位波动使原油进一步弥散.受内部泄漏点影响,垂向深度上离泄漏点越近(0.08m)污染越重,除此之外泄漏点下部(0.15m)原油含量高于上部(0.04m),显示内部泄漏点原油下移较上移明显.
The heterogeneous soil layer was established by self-made three-dimensional plexiglass tank,and two leakage points in shallow and interior soil layer were set up to simulate the mobile phase crude oil migration and redistribution process under the condition of water level fluctuation in water-bearing soil layer.The corresponding resistivity response characteristics were revealed using self-made high density electrode arrays and electrometer.The results showed that the migration of crude oil in soil was affected by the leakage source location,the leakage volume and the soil layer structure.The transverse diffusion of the leakage point in the same soil layer was more obvious in the vertical direction,and oil around the shallow leakage point diffused around.The larger the leakage volume,the wider the pollution range.The higher the permeability of the soil layer,the deeper the pollution depth.There were two kinds of anomalies in high resistance and low resistance after crude oil leakage.When the soil layer structure was simple and the oil content was high,the high resistance anomaly was obvious.When the composition of soil layer was complex,especially the salt and clay mineral contents were high,or the water and oil contents were low,the low resistance anomaly was easy to occur.After the water level rose,the overall soil resistivity decreased and the crude oil was concentrated to the center of the polluted area.After the water level dropped,the resistivity increased,the crude oil dispersed around.From the above,the water level fluctuation caused the oil to diffuse further.Affected by the internal leakage point,the closer near the leakage point(0.08m),the more serious the pollution at the depth.In addition,the oil content in the lower part of the leakage point(0.15m)was higher than that in the upper part(0.04m),indicating that the downward migration of oil was more obvious than the upper one around the internal leakage point.
作者
潘玉英
童奕涵
朱根民
徐飞印
杨金生
俞晔伟
张茜
张萌
田丽娜
PAN Yu-ying;TONG Yi-han;ZHU Gen-min;XU Fei-yin;YANG Jin-sheng;YU Ye-wei;ZHANG Qian;ZHANG Meng;TIAN Li-na(College of Fisheries,Zhejiang Ocean University,Zhoushan 316022,China;United National-Local Engineering Laboratory of Harbor Oil&Gas Storage and Transportation Technology,Zhoushan 316022,China;Zhejiang Hongyu Geotechnical Investigation&Building Design CO.,LTD,Zhoushan 316022,China;Marine Science and Technology College,Zhejiang Ocean University,Zhoushan 316022,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第2期771-779,共9页
China Environmental Science
基金
省属高校基本科研业务费项目(2019J00023)
国家自然科学基金资助项目(41502261)
浙江省自然科学基金资助项目(LY19D060003)
浙江“水产”省一流学科开放课题(20190012)。
关键词
原油污染
水位波动
电阻率监测
非均质含水土层
Crude oil pollution
Water-level fluctuation
Resistivity monitoring
Heterogeneous aquifer
