孔隙介质中弹性性质及波速摸拟研究评述

本文简短地介绍了近年来提出的一种模拟孔隙岩石弹性性质的方法：网络模型方法。它的计算结果与实验结果很接近。     

渭河谷地地下水位变化与作物需水关系

根据天水农试站１９８３—１９９２年地下水位观测资料，分析得出了当地地下水位的变化规律和地下水对土壤水分变化的影响，并根据当地主要粮食作物的生长特点，对其需水与地下水位变化的关系进行了探讨。     

古构造残余应力场对震源的作用

本文根据中国西南部四个强震带残余应力场水平和铅直分布的测量和实验研究结果，讨论了古构造残余应力场对震源的作用：降低震源岩体强度，增大震源岩体形变，与现今应力场迭加在一起促成地震，随岩体破裂释放残余弹性能加到震源释放的现今弹性能中去提高震级和地震活动水平。     

1987年8月2日寻邬5．5级地震的孕育过程

1987年8月2日，江西省寻邬发生MS5．5地震。本文研究了这次地震和震前的各种异常现象，研究发现，震前该区地壳形变和震活动出现了中、长期同步变化，短临阶段，出现了异常地震活动和宏观现象。根据岩石破裂实验结果和地震前兆理论，对这次地震的孕育过程作了阶段性的划分。     

Auto-covariance estimation of variable samples (ACEVS) and its application for monitoring random ionospheric disturbances using GPS

 Ionospheric variation may be considered as a stationary time series under quiet conditions. However, the disturbance of a stationary random process from stationarity results in the bias of corresponding samples from the stationary observations, and in the change of statistical model parameters of the process. From a general mathematical aspect, a new method is presented for monitoring ionospheric variations, based on the characteristic of time-series observation of GPS, and an investigation of the statistical properties of the estimated auto-covariance of the random ionospheric delay when changing the number of samples in the time series is carried out. A preliminary scheme for monitoring ionospheric delays is proposed. Received: 18 August 2000 / Accepted: 12 April 2001     

An application of Boussinesq equations to Bragg reflection of irregular waves

A numerical model based on the second-order fully nonlinear Boussinesq equations of Wei et al. [1995. Journal of Waterway, Port, Coastal and Ocean Engineering 121 (5), 251-263] is developed to simulate the Bragg reflection of both regular and irregular surface waves scattered by submerged bars. Particularly for incident regular waves, the computed results are observed to agree very well with the existing experimental data as presented by Davies and Heathershaw [1984. Journal of Fluid Mechanics 144, 419-446] and Kirby and Anton [1990. Proceedings of the 22nd International Conference on Coastal Engineering, ASCE, New York, pp. 757–768). In the case of incident irregular waves, the simulated results reveal that the distribution of Bragg reflection from irregular waves becomes more flat than that of regular waves. Due to lack of experimental data, the numerical results for incident irregular waves are compared with those of the evolution equation of the mild-slope equation [Hsu et al., 2002 Proceedings of the 24th Ocean Engineering Conference in Taiwan, pp. 70–77 (in Chinese)]. In addition, several parameters such as the number of bars, the relative height of bars and the spacing of bars affecting Bragg reflection are also discussed.     

台湾海峡及其邻近地区的地震海啸与海溢

台湾海峡及其邻区,历史上曾发生过多次海水暴涨。在剔除那些因台风暴雨而引起的海水暴涨外,本区自公元647年以来共发生9次,本文按其形成把它划分为地震海啸和地震海溢两种类型,通过对地质构造、震源机制和地球物理资料等方面阐述其成因条件。认为地震海啸可分布在台湾海峡内,而地震海啸只能分布在台湾东北部海域;在地震海溢中,震级(M)和它影响的距离(△)关系为:M=5.892+0.019△。     

海洋结构物检测、维护和修理计算机支持系统

介绍了“海洋结构物检测,维护和修理计算机支持系统”的设计原理和系统特点,在数据管理与图形处理的基础上,实现了本文与图形的交互查询。系统结构设计合理,功能齐全,界面友好,操作简便,运行稳定,为提高ＩＭＲ业务水平和ＩＭＲ数据管理水平提供了可靠的管理手段。