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华南滨海火山岛地下水动态对海潮的响应特征
曾港, 陈建耀, 董林垚, 李绍恒, 金广哲, 吴瑞钦, 付丛生
PDF(3760 KB)
PDF(3760 KB)
华南滨海火山岛地下水动态对海潮的响应特征
Response Characteristics of Groundwater Dynamics to Ocean Tide in Volcanic Island of South China
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海潮是驱动地下水动态变化的动力基础，为探讨海潮对广东省硇洲岛地下水动态的影响，以地下水位和盐分作为主要指标，采用功率图谱分析地下水动态相对潮汐的频率特征，结合小波变换和互相关方法分析地下水动态的振幅和位相特征.结果表明：（1）硇洲岛海潮对地下水位的水平影响距离约为400~500 m.（2）离海距离、含水层特性是影响地下水对海潮响应的主要因素.（3）硇洲岛西北侧近海第四纪中砂层中存在海水进入地下淡水的通道，当含水层对海潮的水动力响应好且存在联系海水的通道时，海水盐分更易传输到地下淡水中.地下水动态对海潮的响应分析可以有效识别海潮的影响范围，从而为岛屿或近岸地下水咸化现象提供重要依据.
Ocean tide is the dynamic basis driving the hydrodynamic changes of groundwater. In order to explore the influence of ocean tide on the groundwater dynamics in Naozhou Island, Guangdong Province, the groundwater level and salinity were used as the main indicators, and the frequency characteristics of groundwater dynamics relative to tides were analyzed by power spectrum. Moreover, the amplitude and phase of groundwater dynamics were analyzed by combining wavelet transform and cross-correlation methods. The results show follows: (1) The response of groundwater to tidal loading has a certain spatial range. The horizontal influence of ocean tide on the groundwater level in Naozhou Island is about 400-500 m. (2) The distance from the sea and the aquifer properties are the main factors affecting the hydrodynamic response to the tide. (3) The channel connecting groundwater and seawater in Naozhou Island is distributed in the Quaternary medium sand layer. When the aquifer has a good hydrodynamic response to the tide and good connectivity with seawater, the seawater salt is more easily transmitted to the groundwater. The response analysis of groundwater dynamics to ocean tides can identify the influence range of ocean tides effectively, providing an important basis for the salinity phenomenon of groundwater in the island or nearshore areas.
地下水 / 火山岛 / 功率谱分析 / 小波分析 / 互相关分析 / 水动力响应 / 水文地质.
groundwater / volcanic island / power spectrum analysis / wavelet analysis / cross-correlation analysis / hydrodynamic response / hydrogeology
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广东省水文局湛江分局在野外调查过程中给予全力支持，并提供硇洲岛讯地仔村水塔旁的监测井水文地质综合成果图.广东省环境监测总站在研究区基础水文地质资料获取中给予诸多帮助，并提供硇洲岛黄屋村、加律新村、那宴村的统测水位监测孔综合成果图.协助2021年1月~3月硇洲岛野外调研的人员有：梁作兵，伍琪瑞，田帝.向以上给予本文支持和帮助的同行及同门表示感谢！
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