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《高原地震》2016,(3)
基于对5口流体观测井使用的3种数字化水位仪的校测对比实验及与气温、气压、供电交流电压等因素的相关性分析,对数字化水位仪的零漂特征及影响因素进行了研究,结果表明:1水位仪的零漂变化呈非线性的特征,每种水位仪、甚至每台水位仪的零漂变动规律均不完全相同,相比较而言,SWY-1A型水位仪的零漂变动更平稳,变幅较小;2水位仪零漂与气温、气压和供电交流电压的相关系数较低,基本可以排除气温、气压和电源电压对水位仪零漂的影响;3水位仪零漂源于探头,主要受探头老化等因素的影响。探头安装时对探头线测量的精准度、探头线因重力作用的拉长、调整探头埋深时对探头线测量的精准度以及水位校测的人为误差等,往往会导致零漂计算结果上的偏差;4数字化水位观测应定期、规范化地进行水位校测并根据零漂变化对观测数据予以校正,以确保观测数据真实、可靠,能更好地发挥地震预测效能。 相似文献
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针对目前广泛应用于地下流体水位观测中的投入式水位仪存在稳定性差、零漂大等缺点,研制采用智能型绝对值多圈光电编码器的浮子式数字水位仪,介绍其工作原理和仪器结构,并给出仪器性能的实验测试结果,发现其具有高分辨率、高稳定性和低零漂的特点. 相似文献
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介绍在静水位井中观测的数字化水位仪探头的两种现场检查方法及结果 ,讨论这两种检查方法的优点及不足,提出现场检查方法的改进意见和允许特殊井孔内观测的数字化水位仪现场检查频率降低和定期消除数字化水位仪零漂影响的建议。 相似文献
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对岫岩地震台1号井模拟、数字化水位观测精度变化进行了对比研究,结果表明数字化水位资料观测精度在我台有明显提高,仪器自身运行稳定。为了进一步提高水位观测内在质量,总结了影响数字化水位观测精度的几个因素,提出了数字化水位在日常观测中的注意事项。 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献
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George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
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《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
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JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献