基于数值模拟的平原河流弯道生态治理研究

发布时间：2018-04-19 01:18

  本文选题：河流弯道 + 河床形态　； 参考：《人民黄河》2016年11期

【摘要】：建立基于有限体积法的平面二维水动力模型对海河流域鲁北平原典型河流弯道进行数值模拟,模拟研究不同流量和不同河床形态条件下河流弯道水流流速,并根据流速与河床冲淤关系分析不同工况下河床、河道边坡的冲淤变化,选出适宜河流弯道生态治理的河床形态,即在原始自然河床基础上进行拓宽、保持自然状态的河床形态。该河床形态的弯道流速梯度小,可以减缓两岸流速分布的不均匀性,水流动力轴线趋于河道中心线;水流流速分布趋于平缓,水面横比降小,弯顶下游低流速区域小,可以减少泥沙淤积。结合土壤生物工程技术,根据弯道水流模拟分析结果,提出平原区典型河流弯道生态治理的布设方案:弯道处河床只添加生态丁坝,或在主河槽处添加高度为15 cm及以下的潜坝。治理方案模拟结果表明添加生态丁坝可以较好地改善弯道水流流场。
[Abstract]:A planar two-dimensional hydrodynamic model based on finite volume method was established to simulate the typical river bends in the northern plain of the Haihe River Basin.According to the relationship between the velocity of flow and the erosion and deposition of the riverbed, the erosion and siltation of the riverbed and the river slope under different working conditions are analyzed, and the river bed which is suitable for the ecological control of the river bend is selected, that is, the river bed should be widened on the basis of the original natural river bed.The shape of a river bed that remains in its natural state.The flow velocity gradient of the curved channel in the form of the river bed is small, which can reduce the inhomogeneity of the velocity distribution on both sides of the river, the axis of the water power tends to the central line of the river, the velocity distribution of the water tends to be gentle, the ratio of the water to the side decreases, and the low velocity area of the lower reaches of the curved top is smallIt can reduce sediment deposition.Combined with soil bioengineering technology, according to the results of simulation analysis of bend flow, a scheme for ecological control of typical river bends in plain area is put forward: only ecological groin is added to the river bed at the bend,Or add a submersible dam with a height of 15 cm or less at the main channel.The simulation results show that adding ecological spur dam can improve the flow field of curved channel water.
【作者单位】： 山东大学土建与水利学院;山东省海河流域水利管理局;
【基金】：山东省省级水利重大科研项目(SDSLKY201207,SDSLKY201302)
【分类号】：TV147;TV85
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本文编号：1770949