• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Sediment budgets for a sediment-laden river: the lower Wei River in the period 1960-1990
【2h】

Sediment budgets for a sediment-laden river: the lower Wei River in the period 1960-1990

机译：沉积物河的沉积物预算：1960年至1990年期间的渭河下游

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fluvial sediment delivery is the main form of sediment transfer from the land to the sea, but this process is currently undergoing significant variations due to the alteration of catchment and base level controls related to climate change and human activities, especially the widespread construction of dams. Using the lower Wei River as an example and an integrated approach, this study investigates the variation of fluvial sediment delivery, as well as the connectivity under the effects of both controls. Based on hydrological records and channel cross-section surveys, sediment budgets were constructed for two periods (1960-1970, 1970-1990) after the dam was closed in 1960. In the period 1960-1969, due to the elevated base level (327.2 +/- 1.62m) caused by the dam, the aggradation rate was 0.451x10(8)tyr(-1) in the channel and 0.716x10(8)tyr(-1) on the floodplain, indicating that the positive lateral connectivity between these locations was enhanced. As a consequence, serious sediment storage resulted in a sediment delivery ratio (SDR) that was smaller than that occurring before 1960. In the period 1970-1990, sweeping soil and water conservation (SWC) measures were implemented, resulting in a reduction of the connectivity between the trunk and tributaries, and a decrease of similar to 31% in the mean sediment input. In addition, together with the base level fluctuation in the range of 327.47 +/- 0.49m, the annual variation in sediment storage was primarily dependent on the water-sediment regime affected by the SWC. The negative lateral connectivity was enhanced between the channel and floodplain via bank erosion. Consequently, the aggradation rate was reduced by 89% on the floodplain and by 96% in the channel. Sediment output continued to decrease primarily due to the SWC practices and climate changes in this period, whereas the SDR increased due to the enhanced longitudinal connectivity between the upstream and downstream. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：河流沉积物的输送是沉积物从陆地到海洋的主要传输形式，但是由于与气候变化和人类活动有关的流域和基准面控制的变化，特别是大坝的广泛建设，该过程目前正发生重大变化。本研究以渭河下游为例，采用综合方法，研究了河流泥沙输送的变化以及在两种控制措施的影响下的连通性。根据水文记录和河道断面调查，在1960年大坝关闭后，为两个时期（1960-1970年，1970-1990年）建立了沉积物预算。在1960-1969年期间，由于基础水位升高（327.2）由大坝引起的+/- 1.62m），河道内的淤积速率为0.451x10（8）tyr（-1），漫滩上的淤积率为0.716x10（8）tyr（-1），表明这些位置得到了增强。结果，严重的沉积物存储导致沉积物输送比（SDR）小于1960年之前的水平。在1970-1990年期间，实施了广泛的水土保持（SWC）措施，从而降低了主干和支流之间的连通性，平均泥沙输入量减少了约31％。此外，加上基准水位在327.47 +/- 0.49m范围内波动，沉积物的年变化量主要取决于受西南海盆地影响的水沙状况。通过河岸侵蚀增强了河道与洪泛区之间的负面横向连通性。因此，洪泛区的凝结率降低了89％，河道的凝结率降低了96％。沉积物产量继续下降主要是由于这段时期内的西南沿海实践和气候变化所致，而特别提款权的增加是由于上游和下游之间纵向联系的增强。版权所有（c）2014 John Wiley＆Sons，Ltd.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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