利用气压引起的周期性地下水位变化估算含水层分类和气动扩散系数

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2020-01-01 DOI:10.3178/HRL.14.111
Heejun Yang, T. Shibata
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引用次数: 2

摘要

为了对含水层类型进行分类,并利用谐波分析和解析表达式估计气压扩散率,我们测量了日本别府火山扇南部具有厚不饱和带的无承压含水层的地下水位和气压。地下水位与大气压力呈负相关,与大气压力的时间差很小或没有时间差。地下水位和气压在k1(月-日)和s2(主日-半日)潮汐分量上表现出明显的周期性变化,而在O(主月-日)和m2(主月-半日)潮汐分量上表现不明显,这是太阳和月球相对地球的运动。说明该含水层为无潮汐作用的无承压含水层类型。利用地下水位和大气压之间的变化,估计非饱和带的气动扩散系数为7.6 × 10 -2 ~ 5.7 × 10 -3 m2 /s。气动扩散系数和非饱和带厚度对无承压含水层地下水位与大气压之间的幅值比和相位滞后有较大影响。
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Aquifer classification and pneumatic diffusivity estimation using periodic groundwater level changes induced by barometric pressure
: To classify the aquifer type and to estimate the pneu‐ matic diffusivity using harmonic analysis and analytical expressions, we measured groundwater levels and baro‐ metric pressure in an unconfined aquifer with a thick un‐ saturated zone at a southern part of the Beppu volcanic fan, Japan. The groundwater level was inversely related to the barometric pressure, with little or no time lag behind baro‐ metric pressure. The groundwater level and barometric pressure exhibit periodic changes with prominent spectra at K 1 (lunar-solar diurnal) and S 2 (main solar semidiurnal) tidal constituents but not at O 1 (main lunar diurnal) and M 2 (main lunar semidiurnal) tidal constituents, which are the motions of solar and lunar relative to the earth. It indicates that the aquifer is an unconfined aquifer type with no earth tide effect. Pneumatic diffusivity in the unsaturated zone was estimated as 7.6 × 10 –2 to 5.7 × 10 –3 m 2 /s using changes between the groundwater level and the barometric pressure. The pneumatic diffusivity and the unsaturated zone thick‐ ness strongly affect amplitude ratios and phase lags between the groundwater level and the barometric pressure in the unconfined aquifer.
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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