高密度电法多排列连接方法在工程勘察中的应用     

王卓  王玉宽  张清利 《岩土工程技术》2011,25(3):138-141

高密度电法勘探的测线一般由多个排列组合而成,在工程勘察中将多排列数据连接起来进行处理和解释,使解释数据更加方便、直观和准确。结合工程实例,对高密度电法多排列连接方法进行研究,探讨方法的可行性。  相似文献   

海洋工程中大直径管桩垂直水平荷载试验研究     

蔡伟忠  叶俊能 《上海国土资源》2011,32(3):81-86,92

通过海洋环境条件下大直径管桩的垂直和水平荷载试验,分析了管桩在垂直和水平荷载作用下的受力特点,得到了管桩的垂直极限承载力、侧摩阻力及端承力、轴向反力系数等结果,以及水平荷载作用下桩顶位移和转角关系、弯矩分布、土抗力、水平地基反力系数的比例系数和最大弯矩点等参数。试验结果表明：垂直荷载作用下,极限承载力可达12000kN,在沉桩过程中部分桩有一定程度的闭塞;大直径管桩能够抵抗水平荷载的作用,弹性长桩的受力性质主要受上部土层的影响。根据试验结果计算的水平地基抗力比例系数m值,对本工程及同类地质条件的桩基设计具有参考价值。  相似文献   

地震水准测量成果中L项改正的讨论     

薄万举  陈聚忠 《大地测量与地球动力学》2011,31(3):34-37

依据国家一、二等水准测量规范(GB/T 12987-2006),分别给出了水准测量中标尺温度改正、正常水准面不平行改正、重力异常改正、固体潮改正和海潮负荷影响等改正的计算公式和方法,并对地震形变分析计算中进行各项改正的必要性进行了讨论.强调:在形变分析计算中,是否进行某一项改正,新老成果必须保持一致;老成果没有进行改正...  相似文献   

气象因素对淮北市电力负荷的影响及其预测研究     

汪付华  周后福  张屏  靳继斌  孙金贺  王苏瑶 《气象与环境学报》2020,36(4):104-111

利用2012—2016年安徽省淮北市逐日用电负荷和气象要素数据,采用相关分析、回归分析、曲线拟合等统计方法,分析用电负荷的季节变化、周末/节假日效应变化规律,提炼主要气象影响因子并分析温度对负荷的1℃效应和负荷对最高温度的敏感性,构建趋势负荷和趋势方程,介绍将周末/节假日效应应用于气象负荷提取和不同预测模型的建立,采用趋势法建立逐日负荷预测的多元回归方程和曲线拟合方程,并针对趋势法的弱点提出2日增量法,建立相应的预测模型,其中2日增量法预测模型的历史拟合率和2017年试报应用均达到96%—97%,比趋势法高2%—3%,比目前的考核要求高4%—5%,提高了负荷预测精度。  相似文献   

区域资源环境与经济发展关系的时空分析   总被引：12，自引：0，他引：12  

赵兴国  潘玉君  赵波  和瑞芳  刘树芬  杨小燕  李会仙 《地理科学进展》2011,30(6):706-714

为揭示中国资源环境与经济发展相互关系的时空演变特征或规律,借助"驱动力-状态-响应"(DSR)概念模型,构建区域资源环境负荷指数,应用脱钩理论及基于弹性分析法改进的脱钩程度判定标准,以1998-2008年为时间界限,以T1、T2、T3、T4和T5个时期为时间尺度,以全国及31个省、直辖市、自治区为空间尺度,试图对中国及...  相似文献   

1950-2008年黄河入海水沙变化(英文)     

刘锋  陈沈良  彭俊  陈广泉 《地理学报(英文版)》2011,21(6):1047-1061

Based on hydrological data observed at Lijin gauging station from 1950 to 2008, the temporal changes of water discharge and sediment load of the Yellow River into the sea were analyzed by the wavelet analysis, and their impacts on the estuary were investigated in different periods based on the measured coastline and bathymetry data. The results show that: (1) there were three significant periodicities, i.e. annual (0.5-1.0-year), internnual (3.0-6.5-year) and decadal (10.1-14.2-year), in the variations of water discharge and sedi- ment load into the sea, which might be related to the periodic variations of El Nino and Southern Oscillation at long-term timescales. Variations of water discharge and sediment load were varying in various timescales, and their periodic variations were not significant during the 1970s-2000s due to strong human disturbances. (2) The long-term variation of water discharge and sediment load into the sea has shown a stepwise decrease since the 1950s due to the combined influences of human activities and precipitation decrease in the Yellow River Basin, and the human activities were the main cause for the decrease of water discharge and sediment load. (3) The water discharge and sediment load into the sea greatly influenced the evolution of the Yellow River Estuary, especially the stretch rate of coastline and the deposition rate of the sub-aqueous topography off the estuary which deposited since 1976.  相似文献   

Extracting fair-weather data from atmospheric electric-field observations at Syowa Station, Antarctica     

Yasuhiro Minamoto  Akira Kadokura 《Polar Science》2011,5(3):313-318

At Syowa Station (69.0°S, 39.6°E), located on East Ongul Island near the continent of Antarctica, atmospheric electric-field observations started in 1968 and had been carried out intermittently. An improved electric-field mill at Syowa Station had and obtained better-quality atmospheric electric-field data from February 2005 to January 2006. After a 1-year interruption, the observations resumed in January 2007.The atmospheric electric-field data from Syowa Station are often contaminated due to local disturbances caused by near-ground meteorological phenomena. We examined correlations between the atmospheric electric field and near-ground weather from February 2005 to January 2006 and from February 2007 to January 2008, and proposed a criterion to extract “fair-weather” electric-field data based on wind speed and cloud coverage data. The diurnal variation of fair-weather data in January followed the shape of the so-called Carnegie curve. Fair-weather data obtained during a substorm showed some correspondence between the atmospheric electric field and variations in the geomagnetic field. This newly developed extraction method may enable the use of atmospheric electric-field data for studying the solar terrestrial environment.  相似文献   

用地壳形变图象动力学研究震源演化复杂过程     

《大地测量与地球动力学》1997,(3)

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宜昌市电力负荷对气象因子的响应及气象预报模型的建立          下载免费PDF全文

杜裕  张明  何卫平  雷东洋  丁丽丽 《中低纬山地气象》2022,46(1):61-67

利用2015-2017年宜昌市逐小时电力负荷资料及对应时段地面气象观测站数据,分析宜昌电力负荷的变化特征,研究气象敏感负荷与气象因子的关系,基于主要气象敏感因子通过逐步回归法建立宜昌电力负荷预报方法。结果表明:宜昌电力负荷呈逐年增长的趋势,夏季和冬季是一年中电力负荷高峰期,年最大电力负荷出现在夏季,年均增幅达11.8%,年最小电力负荷出现在春节期间;气温对气象敏感负荷影响最大,随着日平均气温T升高逐日气象负荷率先减小后增加,当T为17℃时,气象负荷率最小,从而划分了4个变化阶段:17℃≤T<26℃、T≥26℃、7℃≤T<17℃、T<7℃,基于各阶级主要气象敏感因子分别建立电力负荷回归预报方程,经检验,在实际应用中预报相对误差绝对值为3.8%,基本能够满足电力部门负荷预测的精度要求。后期可结合人工智能算法,进一步提高宜昌电力气象负荷预测的稳定性和准确性。  相似文献   

利用张衡一号卫星电场数据研究吉林松原、河北唐山M_S5.1地震前后空间电场时空演化特征     

杨牧萍  钱庚  张学民  孔祥瑞  申旭辉  张萌  翟丽娜  金艳铭 《大地测量与地球动力学》2022,42(11):1161-1165

利用我国第一颗电磁监测试验卫星张衡一号电场探测仪（EFD）载荷记录到的ULF/ELF频段电场功率谱密度（PSD）数据,限制Dst≥－30 nT和K_p＜3排除空间磁环境扰动后,分4个频段对2020年唐山古冶M_S5.1地震和2019年吉林松原M_S5.1地震前后空间电场时空演化特征进行研究。结果发现,2020年唐山古冶M_S5.1地震4个频段扰动幅度均显示出震前先抬升至最高点超过2倍均方差,而后在下降过程中发震,震后恢复的规律,且第2频段异常尤为明显;4个频段扰动幅度时间序列特征相似,且震前均超过2倍均方差。2019年吉林松原M_S5.1地震不同频段的扰动幅度时间序列特征不同,仅有第2频段超过2倍均方差。2次地震均在第2频段（371~879 Hz）出现震前异常扰动,认为该频段是地震异常提取的优势频段。  相似文献