检索结果-南通市图书馆

2010 International Conference on Remote Sensing (ICRS 2010)

作者： Hongchun Peng school of geodesy & geomatics engineering huaihai institute of technology lianyungang chinahaiying li school of geodesy & geomatics engineering huaihai institute of technology lianyungang China

This article used SRTM data to extract the river networks in lianyungang of China. Because of the defect of SRTM data, the data must be filled first. Through the filled data to extract DEM and then to obtain river networks. Different algorithm would get the river networks with different resolutions, so this article made a set of data processing methods to ensure the precision. Selecting different CSA thresholds would obtain differently detailed river networks. The analysis showed that the selection of CAS threshold is very important and will influence the statistic characteristics of whole basin river networks directly. The algorithm could simulate the real water system in the area with topographic relief. In contrast to the area with flat terrain, for example in lianyungang, the algorithm will cause distinctive errors.

关键词： SRTM River Networks DEM lianyungang

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Historical trends in the anthropogenic heavy metal levels in the tidal flat sediments of lianyungang, China

引用

Journal of Environmental Sciences 2013年第7期25卷 1458-1468页

作者： Rui Zhang Fan Zhang Yingjun Ding Jinrong Gao Jing Chen li Zhou school of geodesy and geomatics engineering Huaihai Institute of Technology State Key Laboratory of Pollution Control and Resources Reuse Nanjing University Jiangsu Marine Resources Development Research institute Huaihai Institute of Technology

The sedimentation of metals can preserve the historical record of contaminant input from local and regional sources and provide information on the historical changes in regionalwater and sediment quality. We report the 210Pb activities and the heavy metal （Cd, Cr, Cu, Mn, Pb and Zn）depth profiles from sediment cores retrieved in 2010. The mean sedimentation rates of 0.85-1.5 cm/yr aredetermined by 210 Pbdating. The sediments in the tidal flat have recorded heavy metaldeposition and thus allow the establishment of a connection between the temporal evolution of the heavy metal pollution and the historical changes in the economicdevelopment of lianyungang. The enrichment factors （EF） are calculated to estimate the level of contamination stored in these sediments. The results show that in the studied sites, Cr and Cudisplay low EF values and are mainly from lithogenic origin. For the other studied trace metals, a great variability in the sedimentary record is observed. Significant anthropogenic enrichment over the last 50 years is revealed at the tidal flat that receives fluvial inputs. Zinc is the elementwith the highest EF values, followed by the order of Pb 〉 Cd 〉 Mn 〉 Cu and Cr. The temporal variations of the heavy metals peakduring the late 1980s to the early2000s and show adecreasing trend afterward. The pollution intensity of the tidal flat isdetermined by using EF and thegeo-accumulation index （Igeo ）,which show that, based on the Igeo scale, the tidal flat of Haizhou Bay is unpolluted to moderately polluted.

关键词： sediment rates heavy metals pollution anthropogenic input tidal flat

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：