【作者】 许栋； 黄雄合； 及春宁； 白玉川；

【Author】 XU Dong;HUANG Xionghe;JI Chunning;BAI Yuchuan;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University;

【机构】 天津大学水利工程仿真与安全国家重点实验室；

【摘要】 本文基于河弯水流运动的线性理论以及河谷地形沉积的概念模型建立了蜿蜒河流横向摆动及地形沉积过程耦合数学模型,在河岸侵蚀模式中,引入植被动力学模型,描述植被生长动力过程,形成植被演变-河弯演变与地形沉积耦合动力模型。对同一条蜿蜒河流在不同生长周期特性植被影响下的演变过程进行了长时间数值模拟,结果表明,当植被生长周期与河弯从微弯至裁弯历时相接近时,对河弯形态的影响最大,河弯形态的偏斜度有增大趋势,丰盈度有减小趋势。更多还原

【Abstract】 Mathematical model coupling planform evolution and landscape deposit of river meandering was established based on a linear theory of flow in river meanders and a conceptual landscape deposit model.A model for vegetation dynamics was introduced into the bank erosion model to describe the growth process of vegetation,which finally lead to a fully coupled model for vegetation,river meandering and landscape deposit.A series of long period development of a meandering river with vegetation of various growth cycles were simulated.Results show that when the growth cycle closes to the time duration of a river bend(from straight to cutoff),it has the most significant influent on river planforms,which includes increasing of skewness and decrease of fatness.更多还原