...
  • 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 >Reappraisal of sediment dynamics in the Lower Mekong River, Cambodia
【24h】

Reappraisal of sediment dynamics in the Lower Mekong River, Cambodia

机译：重新评估柬埔寨湄公河下游的泥沙动力学

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 Mekong Basin in southeast Asia is facing rapid development, impacting its hydrology and sediment dynamics. Although the understanding of the sediment transport rates in the Mekong is gradually growing, the sediment dynamics in the lower Mekong floodplains (downstream from Kratie) are poorly understood. The aim of this study is to conduct an analysis to increase the understanding of the sediment dynamics at the Chaktomuk confluence of the Mekong River, and the Tonle Sap River in the Lower Mekong River in Cambodia. This study is based on the data from a detailed field survey over the three hydrological years (May 2008–April 2011) at the two sites (the Mekong mainstream and the Tonle Sap River) at the Chaktomuk confluence. We further compared the sediment fluxes at Chaktomuk to an upstream station (i.e. Mukdahan) with longer time series. Inflow sediment load towards the lake was lower than that of the outflow, with a ratio on average of 84%. Although annually only a small amount of sediment load from the Tonle Sap contributes to the delta (less than 15%), its share is substantial during the February–April period. The annual sediment load transport from the confluence to the delta in 2009 and 2010 accounted for 54 and 50 Mt, respectively. This was on average only 55% of the sediment fluxes measured at Mukdahan, a more upstream station. Furthermore when compared to sediment loads further downstream at the Cambodia–Vietnam border, we found that the suspended sediment flux continued to decline towards the South China Sea. Our findings thus indicate that the sediment load to the South China Sea is much lower than the previous estimate 150–160 Mt/yr.
机译：东南亚的湄公河流域正面临快速发展，影响其水文学和沉积物动力学。尽管人们对湄公河输沙速率的理解逐渐增强，但对湄公河下游（平原地区）下游冲积平原的沉积动力学知之甚少。这项研究的目的是进行分析，以加深对湄公河查库图木河汇合处和柬埔寨湄公河下游洞里萨河的沉积物动力学的了解。这项研究基于在查科图穆克汇合处的两个地点（湄公河主流和洞里萨河）三个水文年（2008年5月至2011年4月）进行的详细现场调查数据。我们进一步比较了Chaktomuk与较长时间序列的上游站（即Mukdahan）的泥沙通量。流入湖泊的沉积物负荷低于流出的负荷，平均比率为84％。尽管每年仅洞里萨湖的少量泥沙负荷对三角洲有所贡献（不到15％），但在2月至4月期间其份额却很大。从合流到三角洲的年度泥沙输运量分别为54 Mt和50Mt。平均而言，这仅是上游上游穆达汉（Mukdahan）测得的泥沙通量的55％。此外，与柬埔寨-越南边界下游更远的沉积物负荷相比，我们发现悬浮的沉积物通量继续向南中国海下降。因此，我们的发现表明，南中国海的泥沙负荷比先前估计的150-160吨/年低得多。

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