漫垸网河平面准二维与网河一维非恒定流"混合模型"的研究

Study on "Mixture Model"of Overland Braided Stream with Quasi-Two Dimension and One Dimension Unsteady Flow

基于漫垸网河可视为一维网河槽流和二维田面漫流的组合,提出了平面准二维与网河一维相结合的非恒定流"混合模型"。该模型能较好地反映漫垸网河的水流特性,定量地计算人类活动对洪水演进的影响程度和工程措施的防洪效果,为规划设计提供了有效的分析手段。

Based on the condition that overland braided stream can be considered as a combination of underflow of one dimension braided stream and two dimension overflow,this paper puts forward a 'mixture model'of unsteady flow,which is a combination of plan quasitwo dimension and braided stream one dimension.The model,by showing clearly the flow characteristics of overland braided stream and calculating quantitatively the flood impact caused by human activities and flood control results,provides a rather efficient analysis for planning and design.