利用Cole-Cole模型组合得到SIP真参数的联合频谱最优化反演

利用Cole-Cole模型组合和稀释系数理论，可以描述测量得到的视复电阻率频谱与地下多个电性体SIP真参数之间的正演关系。本利用此正演关系进行反演试算，并比较了几种Cole-Cole模型反演方案的效果；提出固定极化目标体和围岩体的极化率同时反演其它各SIP真参数的反演方案。结果表明在固定极化率为真值时，利用此反演方案可以稳定、准确、快速地得出地下电性体SIP真参数。     

参加美国气象学会第13届海洋-大气相互作用科学会议总结

美国气象学会“第13届海洋-大气相互作用科学会议”于2004年8月9～13日在美国缅因州波特兰举行。本届会议与16届边界层和湍流会议一起召开，部分专题报告会联合举行。参加两会的专家来自世界10多个国家，共200多人，其中参加海洋-大气相互作用科学会议专家近100人，88人作了口头报告，并安排晚上时间阅览了两会的大字报。     

大地电磁信号统计特征分析

大地电磁测深法(MT)中,以往基于功率谱的各种处理方法,对MT信号的统计特性设定了许多前提条件,如信号应具有高斯性、线性和最小相位性等特征.如果实际信号并非如此,则处理结果存在以下几个问题:①对于非线性、非高斯信号,不能充分获取隐含在数据中的信息;②若信号不仅是非高斯的而且还是非最小相位的,所得到的处理结果反映不出原信号的非最小相位的特点(姚天任,孙洪,1999;李宏伟,程乾生,2002;Nikias,Petropulu,1993;张贤达,1996).因此,有必要对MT信号特征作系统深入地分析.否则,则无法判断基于传统功率谱方法处理结果的可信度,从而给MT的实际应用带来许多无法预知的后果.     

云宵县5月暴雨客观预报模型

采用文献[1]提出的技术模型，研制了云宵县5月暴雨预报方法，建立了4个因子结构简单而天气学意义明了的客观预报模型。经2000～2003年试用，这种基于场量因子的预报模型，未漏报，严格评定的准确率为67％，明显优于主观预报。     

拟建崇明越江通道高填土路堤稳定性评估

拟建崇明越江通道高填土路基为软土地基,地面标高低,地下水位高,工程地质条件差,需要对高填土路堤的稳定性进行评估.本文分别对5m、8m高的粉煤灰和灰土路堤进行路基抗滑稳定性分析和沉降验算.     

FLOW FIELD IN SCOURED ZONE OF CHANNEL CONTRACTIONS

Experiments were conducted in a laboratory flume to measure the two-dimensional turbulent flow field in the scoured zone of channel contractions under a clear-water scour condition. The Acoustic Doppler Velocimeter (ADV) was used to detect the flow field at different vertical lines along the centerline of uncontracted (main channel) and contracted zones of the channel. The distributions of time-averaged velocity components, turbulent intensity, turbulent kinetic energy, and Reynolds stresses are presented in nondimensional graphical form. The bed shear stresses are computed from the measured Reynolds stresses being in threshold condition within the zone of contraction where bed was scoured. The data presented in this paper would be useful to the investigators for the development of kinematic flow model and morphological model of scour at a channel or river contraction.     

天然气资源评价重点参数研究

天然气资源评价重点参数主要包括产气率、运聚系数、区带评价参数与可采系数等4项.首先,通过生物气模拟、不同类型干酪根的产气率模拟实验,建立生物气、煤岩、不同类型泥岩与碳酸盐岩的产气率图版;其次,通过相关分析,建立运聚系数与地质参数的关系模型: 运聚系数＝0.298-0.00259×烃源岩年龄 0.218×有机碳含量-0.00223×成藏关键时刻-0.00 236×盖层厚度 0.0009×盖层埋深-0.286×不整合数 0.000104×储层年龄;第三,在大量统计分析的基础上,建立中国天然气区带地质评价参数体系与取值标准;最后,基于岩性和驱动类型两大因素将天然气藏分为5种类型,其中:碎屑岩水驱气藏的可采系数为50%～70%, 碎屑岩气驱气藏75%～90%,碳酸盐岩水驱气藏55%～80%,碳酸盐岩气驱气藏80%～95%,致密气藏40%～55%.     

The Activity of Major Faults and the Hydrothermal Alteration Zone at Tianchi Volcano of Changbaishan

It is found by field investigation that the near horizontal top surface of the brown or brick-red hydrothermai alteration zone varies obviously in elevation at different sections of the same layer on the caldera‘s inner wall of Tianchi, with that at the north section near the Tianwen Peak about 110 m higher than that at the south near the Jiangjun Peak in Korea. The top surface of the hydrothermai alteration zone can be taken as key horizon to tectonic movement. The difference indicates that the total uplift height of the NW wall of the Liudaogou-Tianchi-Jingfengshan fault, the principal fault trending NE at Tianchi, is bigger than that of the SE wall ever since the occurrence of hydrothermal alteration. This also explains why the topography in the northwest side of Tianchi is steeper and with more developed river system than in the southeast. The uplifting of the northeastern wall is bigger than that of the southwest along the principal NW-trend fault, namely, the Baishanzhen-Tianchi-Jince fault. It is observed from characters of hydrothermal alteration and the palaeoresiduum, that the recent vertical movement rate along the principal NE-trend fault is larger than that of the principal NW-trend fault. The two faults intersect at Tianchi, dividing the volcano into 4 blocks, with the uplift magnitudes decreasing successively in the order of the north, the west, the east and the south block. The biggest uplift of the north block corresponds well to the shallow magma batch in the north of Tianchi observed by DSS and telluric electromagnetic sounding, and etc. and they may be related with the causes.     

济宁市近40年降水特征分析

通过计算济宁市近40年的降水量距平、5年滑动平均、趋势系数等，分析了全市40年降水量变化特征。结果表明：降水量呈下降态势，但减幅不大；旱年所占比率大于涝年。     

环流季节变化及其异常的诊断分析

介绍了局地型相似系数(LPAC)的计算方法。利用NCEP/NCAR850hPa月平均风场41a再分析资料,得出多年平均月际局地型相似系数图,由此分析了环流的季节变化,并结合长江流域洪涝的1998年,分析了东亚环流季节转换的异常特征。结果表明,局地型相似系数图能很好地揭示环流的季节变化,并能反映季节转换的异常。