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Abstract Field experiments had been made to study the effective porosity of the ground water aquifer, injecting I131 simultaneously with H3, as a reference, at different depths, in the aim of examining the influence of the depth of injection of the radioisotopes on the values obtained for the effective porosity of the aquifer under pumping conditions. A pumped well, fully penetrating a homogeneous sandy aquifer, was chosen. Three runs were undertaken injecting the radioisotopes in a 10 metres distant observation well at three different levels. An additional run was made injecting I131 at the three depths simultaneously. In each run, the activity of the outflowing water was followed till it reached the background level. The results indicate that the values obtained for the effective porosity of ground water aquifer using tracers are not dependent on the depth of injection of the tracer. This conclusion holds for radial flow, in homogeneous aquifers, between the observation well and the pumped well. The percentage recovery of the injected activity was calculated. The experiments were undertaken in Wadi El-Natrun area in the western desert of the U.A.R. The value of the effective porosity for the investigated locality was found to be 0.09. 相似文献
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Abstract. This report summarizes results of monitoring programs for volatile synthetic organic chemicals (VOCs) in Nebraska's private and public water-supply wells conducted by two State agencies. Of 97 community water-supply systems sampled as of June 1984, 16.5 percent (16 systems) showed quantifiable levels of at least one VOC. Detectable amounts of one or more VOCs were measured in samples from 15.9 percent (10) of 63 private wells sampled in 1982. These percentages are consistent with results of other State and national surveys. 相似文献
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通过对吉林省地下流体多年动态观测数据进行全时域的计算机扫描,系统研究其变化规律和特点,分析各种影响因素,重点分析了气象要素与水位变化的相关性,发现相关的节律性和差异性,同时确定吉林省下流体趋势异常指标,进而对吉林省近期地震趋势进行预测。 相似文献
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《Ground Water Monitoring & Remediation》1982,2(2):40-45
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Abstract. Poliovirus survival was studied in ground water under hyperbaric pressures ranging from 500 to 4000 psi. It was found that, as compared to control samples incubated at atmospheric pressure, poliovirus was stable under hyperbaric pressures. The virus was, however, comparatively less stable in sea water subjected to 1000 psi pressure. 相似文献
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昌黎井水氡、水位、降雨之间的相关分析 总被引:13,自引:0,他引:13
对1982年至1997年昌黎井的水氡、水位月均值和昌黎气象站的降雨资料,以不同的时间尺度进行了相关计算。结果表明, 水氡与水位资料的趋势变化具有很好的相关性(R=0.833, n=168)和同步性。较小时间尺度的相关计算结果显示,水位、水氡与降雨不仅具有相关性、同步性,而且也具有差异性,这种差异性特征可作为地震前兆异常,并与唐山地区的地震对应较好,据此可作为短期地震预报指标。 相似文献
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Ralph C. Heath 《Ground water》1973,11(6):50-51
EDITOR'S NOTE: The following article by Ralph C. Heath which appeared in the January 1973 issue of the North Carolina Engineer is another excellent example of how ground-water geologists and hydrologists should and must speak out in their communities in support of ground-water development. 相似文献
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西安地裂缝近期活动与热水井水位关系研究 总被引:4,自引:0,他引:4
本文根据西安小寨地裂缝与西影井第三系深层热水水位的观测资料,分析了二者变化周期的准同步和相位的滞后性特征,并结合地面沉降速率和周围地震活动性,探讨了地裂缝与第三系深层承压水位之间存在内在联系的原因,以及抽水—地面沉降对地裂缝影响的构造动态调制作用. 相似文献