...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sediment transport in a highly regulated fluvial system during two consecutive floods (lower Ebro River, NE Iberian Peninsula)
【24h】

Sediment transport in a highly regulated fluvial system during two consecutive floods (lower Ebro River, NE Iberian Peninsula)

机译：在两次连续的洪水（东北伊比利亚半岛埃布罗河下游）中，在高度调节的河流系统中进行泥沙输送

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

The transfer of sediment through a highly regulated large fluvial system (lower Ebro River) was analysed during two consecutive floods by means of sediment sampling. Suspended sediment and bedload transport were measured upstream and downstream of large reservoirs. The dams substantially altered flood timing, particularly the peaks, which were advanced downstream from the dams for flood control purposes. The suspended sediment yield upstream from the dams was 1700 000 tonnes, which represented nearly 99 per cent of the total solid yield. The mean concentrations were close to 0(.)5 g I-1. The sediment yield downstream from the dams was an order or magnitude lower (173 000 tonnes), showing a mean concentration of 0(.)05 g I-1. The dams captured up to 95 per cent of the fine sediment carried in suspension in the river channel, preventing it from reaching the lowermost reaches of the river and the delta plain. Total bedload transport upstream from the dams was estimated to be about 25 000 tonnes, only 1(.)5 per cent of the total load. The median bedload rate was 100 gms(-1). Below the dams, the river carried 178 000 tonnes, around 51 per cent of the total load, at a mean rate of 250 g ms(-1). The results of sediment transport upstream and downstream from the large dams illustrate the magnitude of the sediment deficit in the lower Ebro River. The river mobilized a total of 350 000 tonnes in the downstream reaches, which were not replaced by sediment from upstream. Therefore, sediment was necessarily entrained from the riverbed and channel banks, causing a mean incision of 33 mm over the 27 km long study reach, altogether a significant step towards the long-term degradation of the lower Ebro River. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：在连续两次洪水期间，通过沉积物采样分析了通过高度受控的大型河流系统（埃布罗河下游）的沉积物转移。在大型水库的上游和下游测量了悬浮的沉积物和河床输沙量。大坝大大改变了洪水时间，特别是高峰，为了防洪目的，从大坝的下游推进了高峰。大坝上游的悬浮泥沙产量为170万吨，占固体总产量的近99％。平均浓度接近0（。）5 g I-1。大坝下游的沉积物产量降低了一个数量级或一个数量级（17.3万吨），显示平均浓度为0（。）05 g I-1。大坝捕获了悬浮在河道中的细沙中高达95％，从而阻止了它们到达河流的最下游和三角洲平原。大坝上游的总床载运输量估计为25,000吨，仅占总负荷的1％。5％。中位床负荷率为100 gms（-1）。在大坝下方，这条河以平均250 g ms（-1）的速度运载了17.8万吨，约占总负荷的51％。大型水坝上游和下游的泥沙输送结果说明了埃布罗河下游的泥沙短缺量。河流在下游河段总共动员了35万吨，上游没有沉积物。因此，沉积物必定会从河床和河床两岸带走，在27公里长的研究范围内造成平均33毫米的切口，这是朝着埃布罗河下游的长期退化迈出的重要一步。版权所有（c）2005 John Wiley＆Sons，Ltd.

著录项

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