羊草沟矿区煤层赋存特征

通过对羊草沟矿区煤层的空间分布范围、厚度、结构、顶底板岩性及开采情况的研究,掌握了煤层、煤质的变化规律,针对矿山的开采情况提出了建议,对矿山建设和资源开发具有指导意义。     

MODIS卫星遥感监测太湖蓝藻的初步研究

依据2007年1～6月MODIS卫星遥感影像反演得到的太湖MODIS卫星表层水温、表层叶绿素浓度分布图,以及真彩色(1,4,3波段)合成图像,监测分析了太湖蓝藻的分布和变化情况.水温、表层叶绿素浓度分布图显示,1～6月,太湖表层水温和叶绿素浓度的分布具有明显的区域性和季节性变化特征,且可以很好的显现藻类的迁移与堆积状况,其分布及变化趋势与实测的太湖蓝藻爆发的强度、地点、分布范围基本一致.MODIS真彩色合成图像直观地反映了湖中藻类的宏观信息,其趋势与叶绿素a浓度的分布极其一致.结果表明,利用MODIS遥感数据探测太湖蓝藻水华的分布状况是可行的,MODIS可用于监测内陆湖泊藻类水华的污染情况.     

地磁记录图数字化识别的研究

在综合考虑乾陵地震台地磁记录图(相纸)中的磁暴期、非磁暴期和超出图幅等形态细节的基础上,利用二值化、字符识别、曲线跟踪等图像处理方法,较好地利用程序实现了地磁记录图纸的数字化识别,识别结果误差一般不超过0.6 mm,在磁暴期个别误差可达1 mm左右.认为地磁记录图的数字化识别是一种较好的历史地磁资料再利用的途径,是完全可行的,可满足地磁观测数据分析的基本需要.     

基于GIS的吉林省西部平原区浅层地下水防污性能评价

文章在DRASTIC指标体系的基础上,结合吉林省西部平原区的实际情况,利用GIS的矢量制图功能生成各单指标图,通过空间叠加分析模块生成评价单元,并利用GIS的属性数据库对吉林省西部平原的浅层地下水防污性能进行了评价,评价结果与区域环境水文地质条件基本吻合。     

The diffusion of Hong Kong cultural values to Mainland China: a case study in Shenzhen

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＯｎＪｕｌｙ1,1997,ＨｏｎｇＫｏｎｇｗａｓｒｅｕｎｉｔｅｄｗｉｔｈＣｈｉｎａａｎｄｂｅｃａｍｅｐａｒｔｏｆＰＲＣ.ＷｉｔｈｔｈｅｒｅｍｏｖａｌｏｆｐｏｌｉｔｉｃａｌｂａｒｒｉｅｒｓｗｈｉｃｈａｒｅａｓｓｏｃｉａｔｅｄｗｉｔｈｔｈｅＢｒｉｔｉｓｈｒｕｌｅｓｏｖｅｒＨｏｎｇＫｏｎｇ,ｉｎｔｅｒａｃｔｉｏｎｓｂｅｔｗｅｅｎＨｏｎｇＫｏｎｇａｎｄｔｈｅｒｅｓｔｏｆＣｈｉｎａｗｉｌｌｕｎｄｏｕｂｔｅｄｌｙｂｅｃｏｍｅｍｏｒｅａｎｄｍｏｒｅｆｒｅｑｕｅｎｔ.Ｉｎｆａｃｔ,ｉｎｔｅｒａｃ…     

映射法在估计强地震动参数中的应用

以我国中南地区为例,参考美国西部地震烈度、基岩峰值加速度、反应谱平均周期和谱光滑卓越周期的衰减规律,采用地震对映射的烈度震级法和烈度距离法,评估了研究区基岩峰值加速度和反应谱频率参数的不同衰减影响因素。     

树木径向生长机制监测和模拟研究进展

 传统的树轮气候学重建研究是基于现代仪器观测资料和树轮序列的统计相关实现的,缺乏机制方面的研究。可靠地重建历史时期的气候变化,需要理解树木径向生长的气候响应机理。目前,国际上的树木径向生长机制研究主要有两种途径,监测与模拟,其中监测研究包括应用树木径向生长测量仪(Dendrometer),微树芯法(Micro-coring)和针刺创伤法(Pinning)3种。从两类大的研究途径出发,综述了国内外的研究进展情况,并对未来发展趋势提出展望。     

Use of magnetic signatures to correlate tephra layers in Holocene loessial soil profiles from a small region, SE Iceland

Rock magnetic measurements have been applied to two adjacent loessial soil sections from a small region, SE Iceland. The soils are composed of reworked locally derived sediment (including airfall tephra) and also contain several visible discrete airfall tephra layers. The main magnetic minerals in the airfall tephras are ferrimagnetic (e.g. magnetite) with paramagnetic minerals also present. The main magnetic grain sizes in the tephras are pseudo single domain. The results show that individual tephras do not have unique magnetic signatures that can be used for identification and correlation between sedimentary sequences. However, a correlation of tephra layers was achieved through the application of statistical techniques to a comprehensive dataset of magnetic parameters. Similarity coefficients and Euclidian distance measures were used to identify the best correlation between tephra layers in the two soil profiles. The technique works well providing some tephras present within both profiles have been formally identified (e.g. Oraefajokulla ad 1362) using electron microprobe analyses. Given this initial framework, the statistical analyses of the magnetic parameters can help in the identification and correlation of unknown tephras between two soil profiles.     

Modelling the hydrologic effects of dynamic land‐use change using a distributed hydrologic model and a spatial land‐use allocation model

This study develops a novel approach for modelling and examining the impacts of time–space land‐use changes on hydrological components. The approach uses an empirical land‐use change allocation model (CLUE‐s) and a distributed hydrological model (DHSVM) to examine various land‐use change scenarios in the Wu‐Tu watershed in northern Taiwan. The study also uses a generalized likelihood uncertainty estimation approach to quantify the parameter uncertainty of the distributed hydrological model. The results indicate that various land‐use policies—such as no change, dynamic change and simultaneous change—have different levels of impact on simulating the spatial distributions of hydrological components in the watershed study. Peak flow rates under simultaneous and dynamic land‐use changes are 5·71% and 2·77%, respectively, greater than the rate under the no land‐use change scenario. Using dynamic land‐use changes to assess the effect of land‐use changes on hydrological components is more practical and feasible than using simultaneous land‐use change and no land‐use change scenarios. Furthermore, land‐use change is a spatial dynamic process that can lead to significant changes in the distributions of ground water and soil moisture. The spatial distributions of land‐use changes influence hydrological processes, such as the ground water level of whole areas, particularly in the downstream watershed. Copyright © 2010 John Wiley & Sons, Ltd.