西沙周边海域海平面异常变化特征及成因分析

Based on the analysis of wind,ocean currents,sea surface temperature(SST) and remote sensing satellite altimeter data,the characteristics and possible causes of sea level anomalies in the Xisha sea area are investigated.The main results are shown as follows:(1) Since 1993,the sea level in the Xisha sea area was obviously higher than normal in 1998,2001,2008,2010 and 2013.Especially,the sea level in 1998 and 2010 was abnormally high,and the sea level in 2010 was 13.2 cm higher than the muti-year mean,which was the highest in the history.In 2010,the sea level in the Xisha sea area had risen 43 cm from June to August,with the strength twice the annual variation range.(2) The sea level in the Xisha sea area was not only affected by the tidal force of the celestial bodies,but also closely related to the quasi 2 a periodic oscillation of tropical western Pacific monsoon and ENSO events.(3)There was a significant negative correlation between sea level in the Xisha sea area and ENSO events.The high sea level anomaly all happened during the developing phase of La Ni?a.They also show significant negative correlations with Ni?o 4 and Ni?o 3.4 indices,and the lag correlation coefficients for 2 months and 3 months are–0.46 and –0.45,respectively.(4) During the early La Ni?a event form June to November in 2010,the anomalous wind field was cyclonic.A strong clockwise vortex was formed for the current in 25 m layer in the Xisha sea area,and the velocity of the current is close to the speed of the Kuroshio near the Luzon Strait.In normal years,there is a "cool eddy".While in 2010,from July to August,the SST in the area was 2–3°C higher than that of the same period in the history.     

我国潮汐电站选址的地质地貌条件评价

在考察我国山东白沙口,浙江江厦、海山、岳浦、沙山,福建幸福洋、大官板七个潮汐电站站址的基础上,认为理想的潮电站址要求地基稳定、地震烈度低于6度、潮差大、风浪小、陆域海域来沙少、水库淤积轻微、海湾腹大口小、工程量小等条件。湾中湾、河口湾是理想的地貌位置,我国浙闽沿海潮差大,岸线曲折,港湾众多,具有发展潮电得天独厚的优越条件。     

最小二乘解的一种直接算法

提出一种最小二乘解的直接算法,它无需组成和解算法方程就可以求得同样的L和X。     

桂林岩溶塌陷风险评价

本文从灾害学原理 来研究桂林岩溶区一种特有的自然灾害－地面塌陷，认为塌陷是在多种因素控制下的一种概率事件（具有不确定性）。引入塌陷风险评价的方法，建立塌陷灾害经济评估方案。     

Helmert型方差-协方差分量估计的通用公式

本文在概括函数模型和它的通用公式的基础上,导出了一个适用于所有平差方法的方差-协方差分量估计的通用公式,并由此给出方差分量估计的通用公式和简化的通用公式。     

回归分析在桥梁安全监测中的应用

本文首先介绍了回归分析的基本原理,并给出了回归的精度和回归的效果的评价指标.随后本文结合具体工程利用回归分析理论对桥梁安全监测进行了建模,并得出了几点有益的结论.     

利用VB通信控件实现GRE4与计算机间数据通信

介绍了利用 ＶＢ５． ０中的 ＭＳＣｃｏｍｍ通信控件编程,实现ＧＲＥ４电子手簿与计算机间的数据通信。该程序以 Ｗｉｎ９８为平台,采用图形用户界面,使用简单,操作方便,对子发挥ＧＲＥ４在数字化测图方面的作用有一定的现实意义。     

单站最高最低气温预报方法研究

统计平果县1958-2004年逐日最高、最低气温资料，得到最高、最低气温日际变化的气候特点；结合本地地形特征，分析影响最高、最低气温变化的因素；提取影响最高、最低气温变化的气象要素预报指标，建立单站最高、最低气温预报方法。     

p-范分布母体的抽样分布

定义了Xp分布,tp分布及凡分布,导出了它们的分布密度函数。应用这些分布可对P一范分布子样进行假设检验等统计分析。     

多维粗差的同时定位与定值

提出了多维粗差同时定位定值的方法（ＬＥＧＥ法），它不仅能确定ｋ个粗差的位置（ｋ≤ｒ－１，ｒ为多余观测数），而且可以同时求出这些粗差的大小，从而开辟了粗差定位定值的一条新途径。