潮水变化对北固山湿地水质影响研究

对镇江市北固山湿地潮水变化规律进行了研究,分析了湿地水质与潮水水深的相关关系,研究表明:湿地潮水在丰水期的日周期为1日2次涨落,其水位最大落差为1.59 m;随着潮水水位由高到低各采样点总氮、总磷和氨氮的浓度值由小变大,靠近排污口的1#采样点总氮、总磷和氨氮在低潮时的值分别是高潮时的2倍3、倍和2倍;2#采样点总氮、总磷和氨氮浓度值分别是高潮时的1.5倍、2倍和1倍。1#2、#点各指标值与潮水水深具有极显著的负相关关系,潮水水位的变化对其水质有显著影响;潮水水深与对照点的各项指标有负相关关系,但相关性并不显著,潮水的涨落对其水质没有显著影响;根据方差分析,随着采样点与排污口距离的增加,其水质各指标值显著下降,水质明显变好,这是潮水物理化学以及土壤、植物和生物综合作用的结果。

A Discussion on the Abnormal Tidal Phase Relationship between Water Level and Water Temperature in Qixian Well

Tidal phase of water temperature in Qixian well,Shanxi Province is ahead of water level,which is different from the normal tidal relationship between water temperature and water level. Observation curves of this phenomenon are introduced in this paper,and co-seismic response data of water temperature and water level are used to check the thermometer time system,confirming that this phenomenon is true. Using the harmonic analysis method,variations of time difference between water temperature and water level for the M2 wave are worked out,which indicates that this phenomenon exists during the whole observation. According to the variations of phase lags for water temperature and water level,and the survey of observation conditions, it is considered that the abnormal phenomenon may be related to inadequate passage of water caused by a well blockage at the depth where the water temperature probe was set.

Tidal Response Characteristics of the Well Water Level in the Sichuan-Yunnan Region

In this paper,the long time series data of the well water-level data of 12 wells in the Sichuan and Yunnan area is analyzed by the Baytap-G tidal analysis software,and well water level tidal response characteristic parameters( amplitude ratio and phase change)are extracted. We analyzed the features of the shape and stage change,and characteristic parameters of the tidal response of well water level before and after the earthquakes,which can provide a new method and approach to analyzing the response relationships between well water level and earth tide and barometric pressure. The results show that Luguhu Well and 9 other wells are affected by earth tides,and their well water level amplitude ratios and phases are relatively stable; the Nanxi Well and Dayao Well water level changes are affected by the barometric pressure combined with tide force,and their well water level amplitude ratios and phases are more discrete. The water level amplitude ratios and phases of Jiangyou Well,Luguhu Well and Dongchuan Well are significant to large earthquakes,and the relationship between seismic energy density and water level amplitude ratios and phases of M_2 wave of the three wells are presented.

Relationship between the Earth tidal factor and phase lag of groundwater levels in confined aquifers and the Wenchuan M_s8.0 earthquake of 2008

This work focuses on variations of the Earth tidal factor and phase lag derived from groundwater observations before and after major earthquakes.It is based on an analysis of the data from four observational wells at boundaries between distinct active blocks of China mainland.These wells are also situated on several active fault zones and have exhibited considerable responses to the Wenchuan Ms8.0 earthquake of 2008 in China.We collected hourly records of water levels of these wells from 2007to 2009 and processed these data for analysis.The tidal factors,phase lags,and phase-difference changes of tidal residuals of each well were calculated.We found that when the Wenchuan quake happened,the tidal factors of the 4 wells were changing rapidly,while their phase lags and phase differences of tidal residuals declined swiftly,which may reflect the stress and strain changes of the well-aquifer system during the seismic generation.