大地测量反演模型准外部检验的进一步探讨     

王乐洋  朱建军 《测绘信息与工程》2007,32(2):25-26

给出了大地测量反演模型准外部检验的基本理论,提出了观测数据的划分方法和反演模型准外部质量控制的标准,实现了在进行反演之前对反演模型的事先检验。  相似文献   

上游站水位法在高道水文站流量测验整编中的应用     

李瑞林  韩学军 《水文》2007,27(1):72-74

飞来峡水利枢纽建成蓄水后,高道水文站的水位流量关系受回水影响严重,中低水流量测验整编变得相当复杂。用上游站水位法进行中低水流量测验整编很好的解决了这一难题,取得较好的效果,可为具有相同条件下的水文站流量测验整编提供借鉴。  相似文献   

基于遥感分类的植被覆盖度提取     

潘建平  叶焕倬 《测绘信息与工程》2007,32(6):17-19

阐述了基于遥感分类进行植被覆盖度提取的方法,分析了直接利用关系模型提取植被覆盖度的缺点,遥感分类可获得不同类型地物,此后关系模型分别提取,解决了直接利用关系模型提取中存在的缺点.  相似文献   

On Some implications of the Poisson relation     

FBocchio 《Geophysical Journal International》1998,133(1):207-208

The potentialities of the so-called 'Poisson relation', which holds for uniformly magnetized bodies of constant density, for showing the connections between the gravitational and the magnetic fields of such bodies are considered. In particular, it is seen that the same characteristic ratios occur among the components of the magnetic field intensity and the components of the gradient tensors of the two fields, both locally and non-locally. It is also shown that along the magnetization axis of the body the gradient tensor of the magnetic field displays a 'tidal' structure.  相似文献   

THE CONSTITUTIVE RELATION OF DEBRIS FLOW 1     

SHEN Shouchang 《国际泥沙研究》1998,(3)

ＴＨＥＣＯＮＳＴＩＴＵＴＩＶＥＲＥＬＡＴＩＯＮＯＦＤＥＢＲＩＳＦＬＯＷ１ＳＨＥＮＳｈｏｕｃｈａｎｇ２ＡＢＳＴＲＡＣＴＩｎｏｒｄｅｒｔｏｉｎｖｅｓｔｉｇａｔｅｔｈｅｓｔｒｅｓｃｏｎｓｔｉｔｕｔｉｖｅｒｅｌａｔｉｏｎｏｆｄｅｂｒｉｓｆｌｏｗ,ｔｈｅｅｘｐ...  相似文献   

Nonlinear magnitude frequency relation and two types of seismicity systems     

Shi-Jun Chen  Zhi-Cai Wang  Jiu-Qing Tao 《地震学报(英文版)》1998,11(2):207-218

A nonlinear magnitude frequency equation has been derived in this paper on the assumption that all seismicity systems hold fractal characteristics, and according to the differences of relevant coefficients in the equation, seismicity systems are classified into two types: type I, the whole earthquake activity is controlled by only one great unified system; type II, the whole earthquake activity is controlled by more than one great system. One type of seismicity system may convert to the other type, generally. For example, a type I system will change to a type II system prior to the occurrence of a strong earthquake in North China. This change can be regarded as an index for earthquake trend estimation. In addition, the difference between b value in nonlinear magnitude frequency equation and that in linear equation and the term dΔM related to the coefficients of nonlinear terms obtained in this paper are proved to be a pair of available parameters for medium short term earthquake prediction.  相似文献   

Metallogenic focus-area and superlarge mineral deposits in the bordering zones between China,Russia and Mongolia     

Shaokang Hu  Hongquan Yan  Mao Ye  Weidong Xiang 《中国科学D辑(英文版)》1998,41(1):28-34

Two deep-sea cores in the northwest Pacific have been analysed for sedimentology, mineralogy and environmental magnetism. The results show that after eliminating the interference from volcanism, several proxies such as quartz content, mass susceptibility and anhysteretic magnetic remanence can be used to indicate the eolian deposit from East Asia, and provide information on paleo-atmospheric circulation. A comparison of eolian record in Cure RC10-175 with its oxygen isotopic curve has revealed that the peaks of eolian accumulation occurred at the climatic “optimum” of the Holocene and the last interglaciation, showing the fairly complex nonlinear relationship between continental/pelagic eolian records and the global glacial cycles as well as within the climatic and environmental system. Project supported by the National Natural Science Foundation of China (Grant No. 9291104)  相似文献   

喷灌条件下土壤水分空间分布特性研究   总被引：9，自引：0，他引：9       下载免费PDF全文

李久生  雷志栋 《水科学进展》1998,9(1):7-14

分别在火山灰土和砂壤土两种土壤上进行了不同喷灌均匀系数和灌水量的土壤水分空间分布试验。对土壤干容重空间分布规律的研究表明,干容重在空间的随机分布可用正态分布来表示。为了确定喷灌洒水量和土壤含水率的空间结构,分别计算了它们的半方差和自相关函数。结果指出,喷灌洒水量的相关距离为h～6m,该距离随风速呈增大趋势;灌水停止4h后的土壤含水率的相关距离为5～6m,喷灌均匀系数对该距离无明显影响。田间试验还表明,喷灌洒水在土壤中的分布要比其在地表的分布均匀得多,土壤水分空间分布的均匀性主要取决于土壤初始含水率的均匀程度和灌水量。  相似文献   

河西走廊东部甜菜含糖量预测模式   总被引：1，自引：0，他引：1  

罗晓玲  刘明春 《干旱气象》1998,(2)

运用灰色系统理论中的关联度方法,分析影响武威黄羊镇糖厂含糖量的气象因素,并建立了不含导数项的线性静态模式。经残差修正后,预测精度达９８．１１％。  相似文献   

Estimation from incomplete data files based on magnitude-frequency relation for earthquakes     

G. R. Dargahi-Noubary  Mehdi Razzaghi 《Mathematical Geology》1990,22(4):513-521

The problem of incorporating the available seismological information provided by the major events of the historical catalog with those for the short period of instrumental data is investigated. Assuming that the frequency-magnitude law of Gutenberg and Richter is valid for both periods, an estimation procedure for the main parameter of this law and the rate of earthquake occurrence for historical period is presented. Application of the proposed method is demonstrated, using both real and simulated data. An extension to allow for variable quality of complete data with different magnitude values is also included.  相似文献