检索结果-南通市图书馆

Impacts of socio-economic factors on sediment yield in the upper yangtze river

Journal of Geographical Sciences 2011年第2期21卷 359-371页

作者： DU Jun SHI Changxing FAN Xiaoli ZHOU Yuanyuan Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

In recent years, the role of human activities in changing sediment yield has become more apparent for the construction of hydraulic engineering and water conservation projections in the upper yangtze river, but it has not been evaluated at the macro scale. Taking Sichuan Province and Chongqing City as an example, this paper studies the relationship between socio-economic factors and sediment yield in the upper yangtze river based on section data in 1989 and 2007. The results show that sediment yield is significantly correlated with population density and cultivated area, in which the former appears to be more closely related to sediment yield. Moreover, in the relation of sediment yield vs. population density, a critical value of population density exists, below which the sediment yield increases with the increase of population density and over which the sediment yield increases with the decrease of population density. The phenomenon essentially reflects the influence of natural factors, such as topography, precipitation and soil property, and some human activities on sediment yield. The region with a higher population density than critical value is located in the east of the study area and is characterized by plains, hills and low mountains, whereas the opposite is located in the west and characterized by middle and high mountains. In the eastern region, more people live on the lands with a low slope where regional soil erosion is slight; therefore, sediment yield is negatively related with population density. In contrast, in the western region, the population tends to aggregate in the areas with abundant soil and water resources which usually lead to a higher intensity of natural erosion, and in turn, high-intensity agricultural practices in these areas may further strengthen local soil erosion. It is also found that population tends to move from the areas with bad environment and high sediment yield to the areas with more comfortable environment and less sediment

关键词： the upper yangtze river socio-economic factors human activities sediment yield

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

Retrieval of suspended sediment concentrations in the turbid water of the upper yangtze river using Landsat ETM+

引用

Science Bulletin 2007年第S2期 273-280页

作者： WANG JianJun~(1+) LU XiXi~1 ZHOU Yue~2 1 Department of Geography,National University of Singapore,10 Kent Ridge Crescent,119260 Singapore 2 Department of Environmental Science,Kunming University of Science and Technology,Kunming 650093,China

For the remote areas like the Longitudinal Range-Gorge Region(LRGR),it is hard to measure the sus- pended sediment concentrations(SSC).This study attempted to estimate SSC by employing the three atmospheric correction methods:COST,iCOST(modified from COST)and TZB5(newly proposed). TZB5 can more accurately determine the atmospheric transmittance along the sun-ground surface path (TAUz)from the solar zenith angle(TZ),and it uses Band 5 to eliminate the path radiance of Bands 1—*** water surface reflectance at Band 4 obtained using TZB5 has a stronger relation with SSC within the range of 0-3000 mg/*** developed algorithms could accurately estimate SSC directly from ETM+ Images in the turbid upper yangtze river,and were also effective in the Middle yangtze river.

关键词： image-based atmospheric correction suspended sediment concentration(SSC) Landsat ETM+image turbid water the upper yangtze river

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Analysis on Runoff Changes and their Causes in the upper yangtze river Basin

Analysis on Runoff Changes and their Causes in the Upper Yan...

引用

民生水利——理念与行动：中国水利学会2010学术年会

作者：王渺林长江水利委员会水文局长江上游水文水资源勘测局

＜正＞The yangtze river from the source regions to the Yichang station is called as the upper yangtze *** area is about one million square *** runoff changes at sixteen main control stations in the upper reaches of yangtze river basin were analyzed *** results show that except in the Jinsha river basin,the runoff in the other basin decreased more or *** them,the runoff in the Minjiang river,Hengjiang river,Tuojiang river and Jialing river decreased *** runoff at the Cuntan station increased before 1968,but decreased significantly after 1993.A large scale distributed monthly water balance model was developed and applied in the upper yangtze *** model was used to evaluate the impacts of climate change and human activities on the changes of runoff generation in the upper yangtze river basin and to explore the causes of runoff *** runoff at the Cuntan station of yangtze river decreased significantly since 1993 and climate change was the main factor that the contribution rate of climate change was 71.43%.Meanwhile,it was need paid attention to that the runoff in the Minjiang and Jialing river basin decreased obviously and the contribution of human activities to runoff change reaches to about a *** was related to the intense human activities in those *** activities will most probably play a dominant role in influencing the discharge of the Minjiang and Jialing river basin.

关键词： hydrology and water resources distributed monthly water balance model runoff change human activities climate change the upper yangtze river

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

抓住机遇，加快“长治”工程建设步伐

引用

中国水土保持 1995年第3期 9-10页

作者：周文智中华人民共和国水利部

抓住机遇，加快“长治”工程建设步伐周文智（中华人民共和国水利部，北京１００７６１）一、“长治”工程处于一个良好的机遇当前，“长治”工作的形势很好，通过六年的综合治理，积累了一些经验，对搞好今后的“长治”工作是一个良好... 详细信息

抓住机遇，加快“长治”工程建设步伐周文智（中华人民共和国水利部，北京１００７６１）一、“长治”工程处于一个良好的机遇当前，“长治”工作的形势很好，通过六年的综合治理，积累了一些经验，对搞好今后的“长治”工作是一个良好的机遇。六省的领导同志，特别是肖省...

关键词： ] key harnessment the upper yangtze river soil and water conservation

来源：

同方期刊数据库

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

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

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：