本文關(guān)鍵詞： 入湖河流三角洲 形成發(fā)展規(guī)律 縱向推進(jìn)速率 造床試驗　出處：《應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報》2016年05期 　論文類型：期刊論文

【摘要】：通過概化水槽試驗對水流泥沙從河流進(jìn)入淺水湖泊層后的三角洲堆積體形成發(fā)展過程進(jìn)行研究,得到如下規(guī)律.平面形態(tài)變化:第一階段,三角洲堆積體在初期按水下舌狀、扇狀和樹枝狀形態(tài)形成發(fā)展,其表面有明顯的主河槽且兩側(cè)區(qū)域有較多串溝;第二階段,三角洲堆積體表面依次形成順直河槽、分汊河槽和微彎河槽,水流泥沙沿不同河槽的主流方向以不同方式向前推進(jìn).縱向推進(jìn)速率變化:第一階段初始較大,受橫向展寬影響縱向推進(jìn)逐漸減弱;第二階段以相對穩(wěn)定的速率推進(jìn).垂向變化:堆積體的淤積抬高速率初始較大,隨歷時增加逐漸減小并保持穩(wěn)定,整體上不斷淤積抬高.橫向變化:受河槽底部泥沙淤積抬高的影響,水流泥沙向兩側(cè)區(qū)域漫流;隨堆積體縱向推進(jìn)長度變長,水流泥沙在河槽主流中出現(xiàn)橫向泥沙輸移現(xiàn)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.

【作者單位】： 中國水利水電科學(xué)研究院流域水循環(huán)模擬與調(diào)控國家重點實驗室;武漢大學(xué)水資源與水電工程科學(xué)國家重點實驗室;
【基金】：中國水利水電科學(xué)研究院專項(泥基本科研KY1613,KY1635) 國家自然科學(xué)基金項目(51079104,51309255) 水利部公益性行業(yè)科研專項(201401002);水利部科技示范項目(SF2016-10) 國家重點實驗室課題(2016TS07)
【分類號】：TV147
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本文編號：1518792