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将多孔介质中井-含水层-隔水层的潮汐水位振幅和位相的计算公式推广到裂隙饱水岩体潮汐分析中, 分析了裂隙含水层中井与裂隙, 裂隙与微裂隙的潮汐孔压响应原理和水流交换过程, 提取了影响裂隙含水层潮汐水位振幅和位相的主要因素, 应用井-裂隙排水产生的井水位-引潮高的振幅比A和位相差α2主要随径向等效导水系数T同向变化, 裂隙和微裂隙(孔隙)排水产生的孔压-引潮高的振幅比D和位相差α1主要随不排水条件下微裂隙与裂隙间振幅比E'/E反向变化的规律, 提出了潮汐井水位振幅和位相的8种不同变化类型, 分析了不同类型所反映的含水层形变, 并用于分析东川、 弥勒和西昌川03等3口井井水位振幅和位相变化的成因. 相似文献
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本文选择沿华蓥山断裂带分布的荣昌等4口观测井,利用Baytap-G潮汐分析方法,计算各井水位和气压及理论固体潮的潮汐振幅谱,比较其潮汐频谱差异,通过对主要潮汐分波振幅的回归计算定量分析各井水位受气压潮和固体潮影响的大小。基于对井水位正常动态的认识,选择各井水位潮汐的主要分波,对井水位长时序数据进行分析计算,提取水位潮汐响应特征参数(振幅比和相位差),进而探讨特征参数动态变化特征。最后对井水位受气压潮和固体潮影响的差异原因进行了初步探讨。结果表明,荣昌井水位主要受气压作用的影响,北碚、大足、南溪三口井水位受固体潮-气压潮综合作用的影响,而荣昌井水位只受气压潮影响可能与该井所处含水层裂隙发育且该井未下设止水套管有关;荣昌井P_1S_1K_1波和南溪井M_2波振幅比和相位差在几次大震后没有明显变化,说明地震波没有使井孔与含水层之间的水流交换发生显著变化,而北碚井和大足井M_2波振幅比和相位差分别在汶川和芦山地震时发生变化,反映了地震波的疏通影响。 相似文献
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基于流体及岩石力学理论,利用气压和潮汐效应,研究了苏皖地区苏02井、苏03井、苏06井、苏18井和定远04井含水层介质在不排水状态下孔隙度和渗透系数的变化情况.结合井-含水层系统在受力和水均衡两种状态下的微动态变化模型,分析了各井水位自2014年下半年以来相继出现同步上升现象的水动力学成因机制.结果表明:① 5口井的气压系数与M2波潮汐因子之间存在明显的线性关系,即气压系数越大,潮汐因子也越大;②各井的孔隙度和渗透系数出现一组同步增大现象,主要与补给量大于泄流量、补给增强有关. 相似文献
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利用水位、 气压和理论固体潮数据, 采用卷积回归法中水位对气压的阶跃响应函数, 定量地分析和判定了华北北部板桥井、 大灰厂井、 黄骅井、 大甸子井、 丰镇井和三号地井的井-含水层系统的地下水类型, 并结合研究时段内各井的气压系数和M2波潮汐因子的结果进行了对比分析． 结果表明: ① 各井的滞后时间与阶跃响应函数之间存在明显的以e为底的指数函数关系, 且底数e的系数的正负决定了井-含水层系统的地下水类型; ② 承压井的阶跃响应函数随滞后时间的增大而增大, 且最佳阶跃响应函数值越大, 相应的气压系数和M2波潮汐因子也越大, 反之亦然; ③ 潜水井和半承压水井的阶跃响应函数随滞后时间的增大而减小, 其最佳阶跃响应函数与气压系数和M2波潮汐因子间的关系不明显, 可能与含水层的水力特性、 井孔结构及固体潮汐波的频率有关． 相似文献
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大地震引起了左家庄和宝坻(相距～50km)两井中截然不同的同震水位响应.我们用水位的气压和潮汐响应来分析解释此现象.结果表明,宝坻井的观测含水层中存在页岩,且此井受裂隙影响很大,储水效应较差.页岩的复杂裂隙或者各向异性可能会导致此井观测含水层处于半封闭状态,从而导致垂直向排水的发生.通过多方计算分析后,我们将这两口井划分为两种模型—1.水平流动模型;2.水平流动+垂直流动的混合流动模型.由于裂隙影响,宝坻井的观测含水层介质与外界的水力沟通性在震前就较强(震前渗透率就比较大),所以宝坻井观测含水层与外界的孔隙压差异较小,导致同震渗透率上升较小甚至没有变化,这些因素是导致该井同震水位变化幅度总是非常微小的原因. 相似文献
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利用Baytap-G潮汐分析软件对川滇地区12口观测井数字化水位的长时序数据进行计算, 提取井水位潮汐响应特征参数(振幅比和相位差), 分析其形态、 阶段变化等特征, 探讨地震前后井水位潮汐响应特征参数的变化情况, 为深入分析井水位与固体潮、 气压之间响应关系的研究提供新的方法和途径。 结果表明, 泸沽湖井等10口受固体潮影响的井水位振幅比和相位差变化相对稳定; 而南溪井和大姚井受到气压-固体潮综合作用影响的井水位振幅比和相位差变化则比较离散。 其中江油川10井、 泸沽湖井、 东川井等3口井水位振幅比和相位差对大震的响应显著, 并给出了地震能量密度与这三口井水位M2波相位差和振幅比的变化关系。 相似文献
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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 M2 wave of the three wells are presented. 相似文献
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深井水位对固体潮和气压的响应 总被引：1，自引：0，他引：1
本文以体应变固体潮对深井水位影响的偏微分方程为基础，考虑到含水层与井孔之间相互渗流的边界条件，用叠加原理、冲量定理的分离变量等方法得出了方程的解。把水井含水层的参量给予一些可能的值，通过数值计算讨论了水井固体潮系数、位相滞后和含水层参数之间的关系，解释了井水位对固体潮响应的位相滞后现象。结果表明，井孔的半径、含水层的孔隙度及固体骨架的体压缩系数愈大，含水层的导水系数愈小，则水井水位的固体潮系数愈小 相似文献
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The seismic waves excited by the M
w
7.6 Olyutorskii earthquake that occurred on April 20, 2006 in the Koryak Upland gave rise to water-level changes in five
wells situated in continental areas of Kamchatka at hypocentral distances of 750–1150 km. We describe the effects due to seismic
waves, as well as the water-level anomalies for February–April 2006 before the earthquake. We used an original technique for
the processing of water-level records based on the study of barometric and tidal water-level responses in order to estimate
the volume strain in water-saturated rocks during synchronous level variations at two wells. We discuss possible mechanisms
for producing anomalous water-level changes due to elastic deformation of monitored groundwater reservoirs and to crack dilatancy
in the water-saturated rocks. 相似文献
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用新的分层承压含水层模式 ,不但考虑含水层的力学压缩性质 ,而且考虑含水层的渗流特性 ,并结合扰动信息源的频率特性 ,分别研究扰动源地球固体潮、大气潮和地表负荷潮对承压井水位和流量的影响机理 ,给出相应的偏微分方程。从方程的解释或数值解讨论扰动源与承压井含水层的力学压缩参数、渗流特性参数及与频率特性频数的关系 ,进而给出承压井水位和流量对地球固体潮、大气潮和地表负荷潮汐响应的统一数学方程及其潮汐响应函数 ,并揭示了上述几类潮汐扰动信息源对承压井水位和流量影响的物理机理 相似文献
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许多地下流体监测井在地震发生时都能记录到同震水位变化,而利用地下水位的同震响应特征以及水位固体潮效应可以反演地震对含水层产生的体应变量．本文尝试从大尺度上对大地震引起的体应变变化进行研究,为此收集了位于我国大陆不同构造活动区5口地下流体监测井两年半的水位数据资料进行分析,去除干扰项,提取出水位固体潮成分,进行调和分析求取潮汐因子,并反演出汶川MS8.0地震对这5口井所在含水层产生的体应变量．结果显示,汶川大地震对这5口井 含水层造成的体应变量基本在10-7量级. 地震引起的体应变随距离的衰减规律比较复杂,其不仅与震中距有关,而且与活动断裂带的展布和地壳岩体结构等密切相关． 相似文献
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计算井水位对固体潮和气压滞后响应的新方法 总被引：4，自引：0，他引：4
提出了一种计算井水位对固体潮和气压滞后响应的新方法.利用杜得森潮汐展开和泰勒级数展开,导出了计算井水位固体潮系数和气压系数以及滞后时间公式,并给出了考虑滞后影响的井水位固体潮和气压改正公式.利用该法处理了鲁03井水位和气压观测资料,求出该井水位固体潮系数为1.8mm/10~_(-3),水位对固体潮响应的滞后时间为1.53小时,气压系数为6.4mm/hPa,滞后时间为1.5小时。与以前的一般回归分析方法相比,改正后的水位中误差明显减小,改正效果较好。 相似文献
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根据潮汐因子计算结果,确定了井水位观测格值。又由线应变和水位与体应变转换公式,分别计算了在固体潮、大气压、强远震和承压含水层排水作用下伸缩仪与水位仪的的体应变响应量,二者相对变化率(体应变比值)在0.242~0.668之间,分析比较了二者的响应特征,并初步解释了水位与应变同步变化的物理机制。 相似文献
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Christopher A. Gellasch Herbert F. Wang Kenneth R. Bradbury Jean M. Bahr Lauren L. Lande 《Ground water》2014,52(1):105-117
Reverse water‐level fluctuations (RWFs), a phenomenon in which water levels rise briefly in response to pumping, were detected in monitoring wells in a fractured siliciclastic aquifer system near a deep public supply well. The magnitude and timing of RWFs provide important information that can help interpret aquifer hydraulics near pumping wells. A RWF in a well is normally attributed to poroelastic coupling between the solid and fluid components in an aquifer system. In addition to revealing classical pumping‐induced poroelastic RWFs, data from pressure transducers located at varying depths and distances from the public supply well suggest that the RWFs propagate rapidly through fractures to influence wells hundreds of meters from the pumping well. The rate and cycling frequency of pumping is an important factor in the magnitude of RWFs. The pattern of RWF propagation can be used to better define fracture connectivity in an aquifer system. Rapid, cyclic head changes due to RWFs may also serve as a mechanism for contaminant transport. 相似文献
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Kue-Young Kim Hyeonjeong Seong Taehee Kim Ki-Hwa Park Nam-Chil Woo Yoon-Suk Park Gi-Won Koh Won-Bae Park 《Journal of Hydrology》2006,330(3-4):525-542
We conducted various field studies at the seawater intrusion monitoring wells located in the eastern part of Jeju Island, Korea, to observe the tidal effect on groundwater–seawater flow in the coastal aquifer. Studies included monitoring the fluctuations of groundwater and tide levels, electrical and temperature logging, and 2-D heat-pulse flowmeter tests. According to time-series analysis, tidal effects on groundwater level reached up to 3 km inland from the coastline. Water-level variation was more sensitive to tidal fluctuations near the coast, and more related to rainfall toward inland areas. Temporal and spatial variations in the shape and location of the freshwater–saltwater interface were analyzed using data from nine monitoring wells. The results indicated that the interface toe is located at a distance of 6–8 km from the coastline and its location was related to geological layers present. Long-term seasonal variations revealed no major changes in the interface; minor variations were due to moving boundary conditions induced by tidal fluctuations. Using the two-dimensional heat-pulse flowmeter, groundwater flow directions and velocities at four tidal stages were measured on three monitoring wells drilled into the multilayered aquifers. This direct measurement enabled us to relate the differences of flow velocities and directions with geology and tidal fluctuations. Combining the results of EC logging and flowmeter tests, we found a zone where freshwater and saltwater moved alternately in opposite directions, as influenced by the tidal fluctuations. Integrating various physical logging and flowmeter data with water-level fluctuations improved our understanding of the behavior of fresh and seawater flow in the coastal aquifers. 相似文献
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承压井水位对气压动态过程的响应 总被引：12，自引：0，他引：12
本文从气压影响承压井水位的偏微分方程出发,考虑到井孔和含水层之间相互渗流的边界条件,得出了方程的解。给出了承压井水位对气庄动态过程响应的气压效率和位相滞后。讨论了气压效率和位相滞后与水井含水层系统各参数的关系。并指出气压效率越大的承压井,其含水层对应力应变的敏感程度越差。 相似文献