• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nordic hydrology >Hydraulic Modelling of Suspended Sediment Deposition in an Inundated Floodplain of the Nemunas Delta
【24h】

Hydraulic Modelling of Suspended Sediment Deposition in an Inundated Floodplain of the Nemunas Delta

机译：Nemunas三角洲淹没洪泛区悬浮泥沙沉积的水力模拟

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

Floods of meadows in the delta of the river Nemunas contribute to the deposition and retention of sediments and nutrient that would otherwise deposit in the Curonian Lagoon. In grassland area of the Nemunas delta the formation of alluvial soil occurs according to the flood dynamic rules: water discharging into the valley leaves suspended sediments on the soil surface. By mathematical modelling it was established that about 35% of suspended sediments inflow deposited there. Due to sand particles deposited during the study period (1950-1991), the natural river bank levee rose by 0.3 m. Fine clay and silt particles deposited uniformly within the entire model area and formed a 4-6 mm thick layer there. It contained about 50-60 t/ha of silt deposits. The valley soils were naturally fertilized with 2501 of potassium, 950 t of phosphorus, 38,0001 of calcium, and even 147,000 t of organic matter saturated with nitrogen. Certain amount of heavy metals also deposited there. The deposition process has not yet been adequately investigated under the conditions of flow bed covered by grass. It was established that grass cover intensified the sediment deposition in the floodplain. Considering calculation results and measurement data, the process of suspended sediment deposition was analysed and new formulas were derived. It was established that in order to increase sedimentation in the valley, it would be necessary to increase water discharge overflowing from river bed into the delta valley.
机译：Nemunas河三角洲的草地洪水泛滥，导致沉积物和养分的沉积和保留，否则沉积物会沉积在库尔斯泻湖中。在Nemunas三角洲的草原地区，冲积土的形成是根据洪水动态规律发生的：向山谷中排放的水在土壤表面留下了悬浮的沉积物。通过数学建模，可以确定大约35％的悬浮沉积物流入那里。由于在研究期间（1950-1991年）沉积了沙粒，天然河岸堤坝上升了0.3 m。细小的粘土和淤泥颗粒均匀地沉积在整个模型区域内，并在那里形成4-6毫米厚的层。它包含约50-60吨/公顷的淤泥沉积物。山谷土壤自然施以2501钾，950吨磷，38,0001钙，甚至147,000吨被氮饱和的有机物。一定数量的重金属也沉积在那里。在草覆盖的流化床条件下，沉积过程尚未得到充分研究。已经确定，草被覆盖加剧了洪泛区的沉积物沉积。结合计算结果和实测数据，分析了悬沙沉积过程，推导了新的公式。已经确定，为了增加山谷中的沉积，有必要增加从河床溢流到三角洲山谷中的水量。

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