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针对鲁北平原区天然河道污染、河道冲淤损坏严重的现状,结合流域河道生态综合整治工程,选用MIKE21软件,建立基于非正交网格的平原区天然河流弯道二维水动力数值模型,模拟天然河流弯道纵横向的流速及水面线特征分布,绘制弯道流速矢量场,得出天然河流弯道的河床及河岸边坡冲刷、落淤分布符合实际情况;结合土壤生物工程技术,提出四种生态治理方案并进行数值模拟,引入鲤鱼流速适宜指数法对治理方案的生态效果进行评价。结果表明,方案4中水流流速趋于均匀分布,对弯道生态治理效果最为显著,生态丁坝在弯道生态治理中起到重要作用。
In view of the serious pollution of the natural rivers in the Lubei plain and the serious erosion and deposition in the river courses, combined with the river ecological comprehensive harnessing project, MIKE21 software was used to establish a two-dimensional hydrodynamic numerical model of the natural river bend in the plain areas based on non- The vertical and horizontal flow velocities of the natural river bend and the distribution of water surface characteristics were simulated and the vector field of curve flow was drawn. The distribution of erosion and siltation of the riverbed and bank slope of the natural river bend was in accordance with the actual situation. Combining with soil bioengineering technology, Four kinds of ecological control programs and numerical simulation, the introduction of common carp velocity index method to evaluate the ecological effects of treatment programs. The results show that the flow velocity in Scheme 4 tends to be evenly distributed and the effect of ecological control on the bend is the most significant. The ecological dam plays an important role in ecological management of the bend.