黄河下游漫滩洪水冲淤规律

发布时间：2018-04-05 08:56

  本文选题：漫滩洪水　切入点：滩槽冲淤　出处：《水科学进展》2016年02期

【摘要】：滩地的淤积层分布记录着以往漫滩洪水的特征,即反映漫滩洪水的量级、频率和持续时间等,同时河漫滩也是预估河流泥沙、洪水灾害防治和湿地生态系统保护等的重要组成部分。根据黄河下游水文年鉴资料,分析滩地的淤积与漫滩洪水的定量关系,为未来河流泥沙预估提供依据。经分析得到大漫滩洪水在来沙系数S/Q0.030kg·s/m6时,主槽冲刷而滩地淤积,反之则滩槽同淤。当S/Q0.030 kg·s/m6时,大漫滩洪水滩地的淤积量主要与漫滩系数Qmax/Qp、上滩水量W0和含沙量S有关;大漫滩洪水的主槽冲刷量则除了与洪水期水量W和沙量Ws有关外,还与滩地的淤积量有关。一般漫滩洪水,当来沙系数S/Q0.023 kg·s/m6时,主槽冲刷而滩地淤积,反之则滩槽同淤。一般漫滩洪水主槽冲刷量与来沙系数S/Q和洪水期水量W有关,而滩地淤积量仅与含沙量S有关。黄河下游漫滩洪水滩地的淤积和主槽的冲刷主要发生在孙口以上河段,而孙口以下河段主槽冲刷和滩地淤积量均较少。
[Abstract]:The distribution of alluvial layer in the beach records the characteristics of the flood in the past, which reflects the magnitude, frequency and duration of the flood, and the floodplain is also used to estimate the river sediment.Flood disaster prevention and wetland ecosystem protection and other important components.Based on the hydrological yearbook data of the lower Yellow River, the quantitative relationship between sediment accumulation and flood is analyzed in order to provide the basis for the prediction of river sediment in the future.By analysis, it is found that the main channel scours the floodplain when the sand coefficient is S/Q0.030kg s/m6, whereas the channel is silted.褰揝/Q0.030 kg路s/m6鏃，

本文编号：1714061