Spectral responses of water level in tidal river and groundwater
Spectral responses of water level in tidal river and groundwater
复制标题
潮汐河流和地下水水位的光谱响应
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
I
中科院分区：
文献类型：
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作者：
D. C. Shih;K. Chiou;Chin;I
本文以台北盆地五个河川水位与七口地下水威尔斯井为研究对象，进行频率域频谱分析。淡水河的全日潮、半日潮和半日潮分量与天文潮的关系密切，分别为K1、M2和M4。此外，在淡水河中段，全日分量呈现相反的相位角;在淡水河上游及新店溪，全日分量的相位也呈现相反的现象。据认为，这些现象可能是由局部变化的河道地形。观测到地下水位与附近河流水位的自谱和互谱与天文潮K1、M2和M4的频率有很好的相关性。通过对河流水位和地下水威尔斯井水位波动的相位变化和时滞的研究发现，全日、半日和半日分潮的潮汐效应有显著差异。气压和水位波动幅度与相位的关系表明，气压变化不影响河流水位和地下水井水位的波动。版权所有© 1999年约翰威利父子有限公司。
The water level of five river stages and seven groundwater wells in the Taipei Basin were analysed by spectral analysis in the frequency domain. The diurnal, semi-diurnal and quarter-diurnal tidal components of the Tanshui River appear to relate closely to astronomical tides as K1, M2 and M4, respectively. It is also found that the diurnal component reveals a reversed phase angle in the middle section of the Tanshui River; the phase of the quarter-diurnal component is also found to be reversed at stations upstream in the Tanshui River and Hsintien Stream. It is believed that these phenomena could be caused by local variation in the river channel topography. The autospectrum and cross-spectrum between groundwater elevation and nearby river stage were observed to correlate highly with the frequency of the astronomical tides K1, M2 and M4. From the study of the phase shift and time lag of water level fluctuations at river stages and groundwater wells, it was found that the tidal effects of diurnal, semi-diurnal, and quarter-diurnal components were significantly different. The relationships between phase and the fluctuated range of atmospheric pressure and water level imply that change in atmospheric pressure does not affect water level fluctuation in the river stage and groundwater well. Copyright © 1999 John Wiley & Sons, Ltd.