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为了获取盘锦滨海湿地实际的水动力弥散参数,设计了地下水野外弥散实验。在实验中,选取对水环境安全、不易被吸附、易于检测的氯化钠作为示踪剂,设计了投源孔、观测孔和抽水孔3孔组合,进行由抽水孔抽水形成人工流场的野外弥散实验。利用该实验的观测数据,采用一维流场、二维弥散的水动力弥散模型,计算得出了水动力弥散系数。结果表明,纵向弥散度aL=1.21 m,横向弥散度aT=0.03 m,当地下水实际平均流速u=6.82 m/d时,纵向弥散系数DL=8.25 m2/d,横向弥散系数DT=0.18 m2/d;实验区以砂质地层为主,氯离子本底浓度较高(1.79 g/L),多孔介质对示踪剂氯离子的吸附作用较弱。盘锦滨海湿地天然水文地质条件对实验过程与结果的干扰和影响作用较小。该野外弥散实验获得的水动力弥散参数可以作为盘锦滨海湿地有关地下水与环境研究方面的参考。
In order to obtain the actual hydrodynamic dispersion parameters of Panjin coastal wetland, the field dispersion experiment of groundwater was designed. In the experiment, selecting the three holes combination of source hole, observation hole and pumping hole, which is safe to water, difficult to be adsorbed and easy to detect, as the tracer, the artificial hole Field dispersion experiment. Based on the observed data of the experiment, the hydrodynamic dispersion coefficient was calculated by using one-dimensional flow field and two-dimensional dispersive hydrodynamic dispersion model. The results show that the vertical dispersion is aL = 1.21 m and the transverse dispersion aT is 0.03 m. When the actual average velocity of the local water is 6.82 m / d, the vertical dispersion coefficient DL = 8.25 m2 / d and the transverse dispersion coefficient DT = 0.18 m2 / d. The experimental area is dominated by sandy strata with a high concentration of chloride ion (1.79 g / L) and weak adsorption of tracer chloride by porous media. Panjin coastal wetland natural hydrogeological conditions on the experimental process and the results of the interference and impact of small. The hydrodynamic dispersion parameters obtained from the field experiment can be used as a reference for groundwater and environmental studies in Panjin coastal wetland.