海南井水位对热带气旋响应特征分析

Analysis on features of well water response in Hainan Province to tropical cyclones

2001—2010年,海南省地下流体观测台网记录到多次热带气旋引起的井水位抖动现象.本文以2003年7月21日强热带气旋"天鹅"和2005年9月27日台风"达维"为例,系统地研究了这两次热带气旋引起的水位抖动变化的特征.结果表明,经过高通滤波,水位抖动变化图像更加明显;通过频谱分析,得知热带气旋引起的水位抖动周期为100—101min;井水位抖动的起始时间、幅度最大值的时间与热带气旋通过海南岛陆的时间一致,且与热带气旋的结构特点、发展和运动过程密切相关,与井孔自身的井-含水层系统对微动态信息响应的能力也有关系.分析认为,气压振荡式升降变化和摩擦是热带气旋引起水位抖动的原因.

Well water vibration phenomena caused by tropical cyclones were recorded by Hainan underground fluid observatory from 2001 to 2010. Taking strong tropical cyclone ＂Swan＂ on July 21, 2003, and typhoon ＂Damrey＂ on September 27, 2005, as examples, this paper systematically studies the features of water vibration caused by the above two tropical cyclones. The results show that water vibration variation image is more obvious through high-pass filtering, the water vibration period caused by tropical cyclones is 1-10 min according to spectrum analysis, the starting time and amplitude peak time of well water vibration are consistent with the time of tropical cyclone passing Hainan Island, and are associated with the structural features, progress and movement process of tropical cyclones, as well as the response capability of well aquifer system to micro-dynamic message. Analysis shows that atmospheric pressure fluctuation and friction enable tropical cyclones to cause water level fluctuation.