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RP图及RQA分析法在滨海浅层地下水研究中的应用

     

摘要

以海南东北部滨海浅层地下水的逐时水位、电导率和地表气压监测数据为基础,利用RP图和RQA分析法对地下水系统的内部动力结构进行研究,分析ε和RR的取值对地下水系统比较结果的影响,并对台风过境引发的地下水系统内部动力结构的改变进行了相应的探讨.研究结果表明:(1)ε的取值对气压子系统的影响较小,但会明显放大或缩小水位和电导率子系统之间的差异性,尤其是电导率子系统,可能导致比较结果完全相反. (2)气压和水位子系统均具有漂移和破碎两种拓扑结构,电导率子系统则以破碎结构为主,部分兼具漂移结构. (3)当台风过境并产生影响时,地表气压出现明显的极小值,而地下水位则相应的出现极大值,RP图上表现为白色带状区域的出现.带状区域的边界可能暗示了台风影响的起止时间,而区域宽度则可能表征了台风的影响时长.此外,个别电导率子系统也相应出现了白色带状区域,很有可能意味着其也受到了过境台风的影响. (4)对于地下水系统而言,其层流态总是比确定性更为显著,系统的平均可预测长度则总是大于“特定状态”的受困时间,表明基于相邻轨道进行预测会获得更长的预见期.%Based on hourly water table,conductivity and surface air pressure data from 3 groundwater monitoring wells located along the northeast coast of Hainan Province in China,RPs and RQA are employed to analyze the inner dynamical structures of groundwater systems.Impacts of different and RR values on RQA results of groundwater systems are analyzed in details.Furthermore,changes of dynamical structures in groundwater systems caused by the typhoon are considered.The results show that:1) ε has little impact on air pressure subsystems,but can truly expand or narrow the gaps in the water table or the conductivity subsystem,especially the latter one.2) Drift and disrupted structures are both contained in the air pressure and water table subsystems while not all conductivity subsystems have drifted structures.3) The impacts of typhoons passing by on the monitoring data will be reflected as white banding areas in the RPs of water table and air pressure,which shows boundaries of the area may infer the start-stop time point of the influence caused by typhoons,and the width of the area correspondingly represents the time interval of the influence.Additionally,RPs of some conductivity subsystem also has white banding area in the corresponding zone which may be considered as a hint of typhoon.4) For groundwater systems,laminarity is always greater than determinism,while the average prediction period based on adjacent trajectories is always longer than the average trapping time of certain status.

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