共查询到19条相似文献，搜索用时 78 毫秒
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利用昭通中心站YRY-4钻孔应变仪前兆观测数据资料,提取降雨对该仪器观测数据的干扰事件,采用降雨总量、瞬间最大值降雨量两类降雨分类统计方法,定量分析降雨对观测数据产生的影响。结果表明:当降雨总量达到40 mm、瞬间最大值降雨量大于0.4 mm时,YRY-4钻孔应变仪观测数据受降雨干扰明显;当降雨总量大于40 mm时,降雨总量与观测数据应变量呈线性关系,瞬间最大值降雨量与降雨总量之间无显著的对应关系。分析认为,降雨干扰影响主要来自降雨渗透和台站周边地质抗水体荷载量大小两个方面。定量分析降雨干扰,有利于区分异常与干扰,积累经验,以便于及时对有效异常进行判定,为地震研究服务。 相似文献
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福州地震台TJ-2型钻孔体应变观测资料干扰分析 总被引：1，自引：1，他引：0
对福州地震台TJ-2型钻孔体应变观测资料进行整理,识别并统计引起数据曲线发生畸变的干扰因素,认为主要有气压、降雨、地下水、雷电、电源干扰等因素。分析各影响因素干扰特征,以便识别体应变观测资料干扰异常。 相似文献
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怀来台体积式钻孔应变仪安装于1988年,以应变固体潮为主要观测目标.多年来,取得了连续完整高质量的观测资料.本文列举了怀来钻孔应变的台址背景及仪器观测条件;分析了实际观测中钻孔应变资料受仪器零漂、气压、水位、降雨等因素的干扰;研究了钻孔应变在本区及邻区震前出现的记录曲线畸变、潮汐因子异常、应变固体潮畸变等不同形式的异常变化并对其进行特征分析.研究表明,钻孔应变观测是获取构造活动异常变化信息,进行地球物理研究、地震预测预报的有效途径. 相似文献
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分析合肥地震台钻孔体应变观测资料干扰因素及特征,发现水位和气压等因素对TJ-Ⅱ型钻孔应变仪影响显著.在该地震台观测优化改造期间,钻孔体应变受到临近钻孔灌水的影响,而降雨和灌水导致的水位变化,对体应变干扰程度不同. 相似文献
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选取乾陵地震台2018—2020年钻孔体应变观测资料,进行完整性、年零漂和观测资料精度分析,通过采样调和分析,评价观测数据质量,并对自然环境变化、仪器系统故障和人为干扰对观测数据的影响进行分析,探讨该台钻孔体应变观测映震能力,认为： ①乾陵地震台体应变测项运行良好,观测数据质量较高; ②降雨、气压是影响体应变观测数据的主要干扰因素; ③体应变对全球7级以上、中国6级以上地震同震响应较明显,震级越大,同震响应持续时间越长。 相似文献
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利用乾陵地震台地电数字观测资料,分析了该台地电阻率变化与降雨的关系,认为两者之间存在着一定的相关关系,降雨是造成地电阻率突变的主要原因,并且通过相关分析校正较好地剔除了降雨对地电阻率变化的影响。 相似文献
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彭登靖 《地震地磁观测与研究》2022,43(4):106-114
利用YRY-4型钻孔应变仪观测资料进行自洽检验,以验证其工作稳定性;分析YRY-4型钻孔应变仪受环境干扰、场地干扰的原因及特点。结果表明,YRY-4型钻孔应变仪观测数据连续可靠;受降雨、融雪、施工等干扰影响较大,降雨后观测曲线常发生趋势性转折,且降雨的影响具有滞后性,场地施工干扰特征明显。 相似文献
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Summary A design flood for a Venezuelan river is computed in the absence of rainfall and stream-flow data of more than a few years. From synoptic studies of an area embracing northern South America and the Caribbean, the type of disturbance producing the abundant rains of the area is determined. A disturbance of this type is maximized on the basis of the ratio of energy dissipated through friction to released latent energy represented by rainfall — in other words, theefficiency of the system is given its highest reasonable value. The synthetic disturbance is moved over the river basin in a manner most favorable for heavy rain. Certain data available from other rivers are used as a cross-check on the resultant flood values. 相似文献
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基于“前兆台网(站)观测数据跟踪分析平台”,对武汉台形变观测资料进行了系统分析,提取出观测曲线受降雨干扰影响的事件,采用降雨总量、初始驱动降雨量和瞬时降雨量最大值等降雨参数对降雨干扰事件进行统计分析。结果表明:降雨总量达40 mm、初始驱动降雨量为0.3 mm或瞬时降雨量最大值达0.6 mm时,DSQ型水管倾斜仪易受降雨干扰;SSY型铟瓦棒伸缩仪当降雨总量超60 mm或瞬时降雨量最大值大于0.5 mm时易受降雨干扰;VS型垂直摆倾斜仪受降雨干扰与降雨总量、初始驱动降雨量和瞬时降雨量最大值无显著相关关系;降雨总量对形变仪器观测物理量的影响基本呈现线性;而形变仪器观测物理量与初始驱动降雨量、瞬时降雨量最大值无显著相关关系。认为武汉台形变观测受降雨影响主要来自降雨渗透影响和周边水体荷载变化影响两个方面。 相似文献
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In practice, rainfall–runoff relationships are achieved through a simply defined runoff coefficient concept that is widely used in many engineering hydrological designs in urban and rural areas. The simplicity of the method, with the sole requirement of runoff coefficient assessment, is the main attractiveness, in addition to its successful prediction of average runoff rates for a given rainfall record. Unfortunately, in the classical regression approach of the rainfall–runoff relationship, internal variabilities are not taken into consideration explicitly. The runoff coefficient is considered a constant value, and it is used without distinction of antecedent conditions for the calculation of runoff from the rainfall record. In this paper, various other uncertainty embedded versions of the runoff coefficient, and hence rainfall–runoff formulation, are presented in terms of statistics, probability, perturbation and, finally, fuzzy system modelling. It is concluded that the fuzzy logic approach yields the least relative error among the various alternative runoff calculation methods; therefore, it is recommended for use in future studies. The application of various alternatives is presented for two monthly rainfall‐runoff records around Istanbul, Turkey. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Owen D. Jones Petter Nyman Gary J. Sheridan 《Stochastic Environmental Research and Risk Assessment (SERRA)》2014,28(8):2015-2025
Existing models of post-fire erosion have focused primarily on using empirical or deterministic approaches to predict the magnitude of response from catchments given some initial rainfall and burn conditions. These models are concerned with reducing uncertainties associated with hydro-geomorphic transfer processes and typically operate at event timescales. There have been relatively few attempts at modelling the stochastic interplay between fire disturbance and rainfall as factors which determine the frequency and severity with which catchments are conditioned (or primed) for a hazardous event. This process is sensitive to non-stationarity in fire and rainfall regime parameters and therefore suitable for evaluating the effects of climate change and strategic fire management on hydro-geomorphic hazards from burnt areas. In this paper we ask the question, “What is the first-order effect of climate change on the interaction between fire disturbance and storms?” The aim is to isolate the effects of fire and rainfall regimes on the frequency of extreme erosion events. Fire disturbance and storms are represented as independent stochastic processes with properties of spatial extent, temporal duration, and frequency of occurrence, and used in a germ–grain model to quantify the annual area affected by extreme erosion events due to the intersection of fire disturbance and storms. The model indicates that the frequency of extreme erosion events will increase as a result of climate change, although regions with frequent storms were most sensitive. 相似文献
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选取泾县、淮北地震台SS-Y型铟瓦伸缩仪2017年度观测资料,从观测环境、观测资料内在质量、降水、气压因素影响差异等方面,对比2个台站洞体应变观测的异同点,并分析观测资料质量出现差异的可能原因。结果显示,淮北地震台形变观测山洞的基础条件和观测资料内在质量全面优于泾县地震台。 相似文献