海气耦合随机动力模式的Fokker-Planck方程

将描写海温和气温交互作用的随机动力模式化为一个Fokker-Planck方程(FPE),然后用矩阵连分法进行求解,并对二氧化碳增温效应进行了计算。当CO₂从330ppm增加到660ppm时增温1.2℃,模式中存在的优势周期为3～4年,当CO₂倍增时各周期有延长的趋势。     

广州海印花园深基坑支护工程施工技术

对位于珠江边，周边施工环境恶劣，地质条件差的广州海印花园深基坑支护工程施工技术进行了总结，为今后类似的复杂大型深基坑支护工程施工提供了成功的经验。     

The Theoretical Links Between Sequential Gaussian Simulation, Gaussian Truncated Simulation, and Probability Field Simulation

Sequential Gaussian simulation (sgsim), Gaussian truncated simulation (gtsim), and probability field simulation (pfsim) are three algorithms frequently used for conditional stochastic simulation. They were developed independently and are seen as different algorithms in applications. This paper establishes that gtsim and pfsim can be bridged by a simple quantile transform between Gaussian and uniform distributions. As for the sgsim algorithm, the normal score back-transform can be seen as a series of truncations of the simulated Gaussian field. All three algorithms are shown to be applicable to both continuous and categorical variables. In practice, gtsim can be most often replaced by the more CPU-efficient pfsim algorithm.     

海气耦合随机动力模式的Fokker—Planck方程

将描写海温和气温交互作用的随机动力模式化为一个Ｆｏｃｋｋｅｒ－Ｐｌａｎｃｋ方程（ＦＰＥ），然后用矩阵连分法进行求解，并对二氧化碳增温效应进行了计算。当ＣＯ２从３３０ｐｐｍ增加到６６０ｐｐｍ时增温１．２℃，模式中存在的优势周期为３￣４年，当ＣＯ２倍增时各周期有延长的趋势。     

A coastal acoustic tomography experiment in the Tokyo Bay

Eight sets of coastal acoustic tomography (CAT) systems were deployed during November 29 to December 10, 2002 at the coasts on both sides of Tokyo Bay to measure tidal current structures at 15-rain interval.Sound transmission across the Tokyo Bay (between Yokohama and Chiba)was successfillly traced,even under severe interference from ship generated wakes and bubbles.Tidal current fields changing from northward to southward flow are well reconstructed by the inverse analysis of travel-time difference data for a period with the best sound transmission condition. It is suggested that the CAT is the most powerful tool to continuously map tidal current fields in the coastal seas with heavy shipping traffic and fisheries activity.     

浅海有限面积源的噪声场空间相关特性研究

本文对有限面积噪声源产生的噪声场的空间相关特性作了讨论。分别研究了接收器处于源区域里面和外面的情形。对一浅海典型声速剖面和 Baltic海区的噪声场相关特性及噪声场强度进行了计算 ,并与无限大噪声源平面的噪声场特性作了比较。同时 ,为把连续谱考虑在内 ,引入一虚假深海底 ,用复模式和来近似计算分支割线的贡献。但当接收器远离源区域时 ,连续谱经过在下介质中的长程传播 ,衰减迅速 ,故其对噪声场的贡献可以忽略 ,而仅考虑离散简正波场的贡献。结果发现 ,有限面积源的噪声场结构无论是水平结构 ,还是垂直结构均是不均匀的 ,都依赖于接收场点的绝对位置。这与无限大噪声源平面所形成的噪声场的特性是不一样的     

Combined Use of Remote Sensing and Continuous Monitoring to Analyse the Variability of Suspended-Sediment Concentrations in San Francisco Bay, California

Analysis of suspended-sediment concentration data in San Francisco Bay is complicated by spatial and temporal variability. In situ optical backscatterance sensors provide continuous suspended-sediment concentration data, but inaccessibility, vandalism, and cost limit the number of potential monitoring stations. Satellite imagery reveals the spatial distribution of surficial-suspended sediment concentrations in the Bay; however, temporal resolution is poor. Analysis of thein situ sensor data in conjunction with the satellite reflectance data shows the effects of physical processes on both the spatial and temporal distribution of suspended sediment in San Francisco Bay. Plumes can be created by large freshwater flows. Zones of high suspended-sediment concentrations in shallow subembayments are associated with wind-wave resuspension and the spring-neap cycle. Filaments of clear and turbid water are caused by different transport processes in deep channels, as opposed to adjacent shallow water. Crown     

相关系数及其在矿产资源预测中的应用

定量变量和定性变量之间相关亲疏程度的度量研究一直未被重视。本文提出几种“C—D”相关系数,它们有效地刻划了定量变量与定性变量之间的亲疏程度。另外,针对现有定性变量的相关系数只重定性变量之“形”而忽视其“质”的缺憾,本文提出几种“D”相关系数,以充分挖掘定性变量中所蕴含的有用信息。最后,给出这些相关系数在矿产资源预测中的应用实例。     

二滩库区地质灾害分布规律及发展趋势分析

库区地质灾害的分布规律及今后的发展趋势对二滩水电站的运营寿命有着重要的影响。电站自1998年蓄水以来,库水位涨落、侵蚀基准面的抬高等变化,对库区地质灾害的稳定性和发展起到什么样的影响,是研究所要解决的主要内容。在实地收集资料的基础上,系统地分析和评价了库区地质灾害,为水电站下一步工作规划提供了重要的依据。