入湖河流三角洲形成发展规律

发布时间：2018-02-20 04:43

  本文关键词： 入湖河流三角洲 形成发展规律 纵向推进速率 造床试验　出处：《应用基础与工程科学学报》2016年05期 　论文类型：期刊论文

【摘要】：通过概化水槽试验对水流泥沙从河流进入浅水湖泊层后的三角洲堆积体形成发展过程进行研究,得到如下规律.平面形态变化:第一阶段,三角洲堆积体在初期按水下舌状、扇状和树枝状形态形成发展,其表面有明显的主河槽且两侧区域有较多串沟;第二阶段,三角洲堆积体表面依次形成顺直河槽、分汊河槽和微弯河槽,水流泥沙沿不同河槽的主流方向以不同方式向前推进.纵向推进速率变化:第一阶段初始较大,受横向展宽影响纵向推进逐渐减弱;第二阶段以相对稳定的速率推进.垂向变化:堆积体的淤积抬高速率初始较大,随历时增加逐渐减小并保持稳定,整体上不断淤积抬高.横向变化:受河槽底部泥沙淤积抬高的影响,水流泥沙向两侧区域漫流;随堆积体纵向推进长度变长,水流泥沙在河槽主流中出现横向泥沙输移现象.
[Abstract]:Based on the generalized flume experiment on Delta sediment from the river into the shallow lake layer after the development of the process of the formation of accumulation body, laws as follows. Plane form variation: in the first stage, deltas according to the water under the tongue at the early stage, and the fan-shaped dendritic morphology form, its surface has obvious main channel and there are more areas on both sides of the string groove; the second stage, deltas are surface form a straight channel, braided channel and micro bend channel, flow and sediment along the main flow direction of different channel in different ways to move forward. The rate of change of vertical propulsion: the first phase of the initial large transverse broadening effect of longitudinal advancing gradually weakened; second the stage at a rate of a relatively stable manner. The vertical variation: the accumulation rate of initial deposition carried larger decreases gradually and remained stable with increasing duration, continuous siltation on the whole. The horizontal elevation Change: affected by the channel bottom silting, sediment to the region on both sides of the overflow; with the accumulation of longitudinal development length of flow and sediment, the emergence of the phenomenon of lateral sediment transport in River mainstream.

【作者单位】： 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：中国水利水电科学研究院专项(泥基本科研KY1613,KY1635) 国家自然科学基金项目(51079104,51309255) 水利部公益性行业科研专项(201401002);水利部科技示范项目(SF2016-10) 国家重点实验室课题(2016TS07)
【分类号】：TV147
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本文编号：1518792