...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary International >Plausible causes of temporal variation in suspended sediment concentration in the upper Changjiang River and major tributaries during the second half of the 20th century
【24h】

Plausible causes of temporal variation in suspended sediment concentration in the upper Changjiang River and major tributaries during the second half of the 20th century

机译：20世纪下半叶长江上游和主要支流的悬浮泥沙浓度随时间变化的可能原因

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the second half of the 20th century, suspended sediment concentration (SSC) varied in different ways in the upper Changjiang River and major tributaries due to the changing human activity and precipitation. The variation in annual precipitation (P_m) can explained only 16%-37% of the variation in suspended sediment concentration, and thus variation in precipitation is not the main cause for the variation in suspended concentration. Using the analysis of double-mass curve, the effect of human activities on the variation in suspended concentration has been studied. The suspended concentration of the lower Jinshajiang River increased from 1983 due to large-scale mining and road and urban construction. The double-mass curve for the Minjiang shows three periods where the relationship between SSC and P_m changes because of reservoir construction and reforestation. The SSC of the Jialingjiang River decreased from 1984 because marked sediment-reduction effect has been achieved by soil and water conservation measures. The SSC of the Wujiang River increased from 1968 and then decreased from 1983, the former can be related to the vegetation destruction that enhanced soil erosion and the latter to the construction of reservoirs that trapped sediment. Compared to the 4 tributaries, the suspended sediment of the main stem of the upper Changjiang River shows smaller variation in SSC. The results of a multiple regression analysis show that the contribution percentages of SSC of the Jinshajiang, Minjiang, jialingjiang and Wujiang Rivers to that of the upper Changjiang are 28%, 13%, 44% and 15%, respectively.
机译：在20世纪下半叶，由于人类活动和降水的变化，长江上游和主要支流的悬浮泥沙浓度（SSC）以不同的方式变化。年降水量（P_m）的变化只能解释悬浮泥沙浓度变化的16％-37％，因此，降水量的变化并不是造成悬浮物浓度变化的主要原因。使用双质量曲线分析，研究了人类活动对悬浮液浓度变化的影响。由于大规模的采矿，道路和城市建设，金沙江下游的悬浮浓度从1983年开始增加。 reservoir江的双质量曲线显示三个时期，SSC和P_m之间的关系由于水库建设和重新造林而发生变化。由于水土保持措施取得了显着的减沙作用，嘉陵江的南海面积从1984年开始下降。乌江的南海面积从1968年开始增加，然后从1983年开始减少，前者可能与植被破坏加剧土壤侵蚀有关，后者与蓄积沉积物的水库有关。与四个支流相比，长江上游主干的悬浮沉积物的南海变化较小。多元回归分析的结果表明，金沙江，jiang江，嘉陵江和乌江的南南合作对长江上游的贡献率分别为28％，13％，44％和15％。

著录项

  • 来源
    《Quaternary International》 |2009年第2009期|85-92|共8页
  • 作者

    Jiongxin Xu;

  • 作者单位

    Institute of Geographical Sciences and Natural Resources Research, Key Laboratory for Water Cycle and Related Land Surface Processes, Chinese Academy of Sciences, Beijing 100101, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号