Numerical calculation for bed variation in compound-meandering channel using depth integrated model without assumption of shallow water flow
Numerical calculation for bed variation in compound-meandering channel using depth integrated model without assumption of shallow water flow
复制标题
不假设浅水流的深度积分模型复合曲流河道河床变化数值计算
DOI：
10.1016/j.advwatres.2014.05.002
复制
发表时间：
2014
影响因子：
4.7
通讯作者：
S
中科院分区：
文献类型：
--
作者：
Uchida;T. and Fukuoka;S
在复合曲流河道中，由于主河道内的高速水流与洪泛平原上的低速水流之间的复杂动量交换，水流结构和河床形态随水深的增加而变化。我们建立了一个新的准三维模型，不考虑浅水假设，即静水压力分布；我们的方法被称为一般底部速度计算（BVC）方法。该方法建立了一套深度积分方程，包括深度积分动量方程和涡量方程，用于计算海底速度和垂直速度的分布。本研究的目的是将BVC方法与泥沙输运模型相结合，建立单一和复合曲流河道的河床变化计算方法。结果表明，BVC方法能较好地再现复合曲流河道中河床随相对深度增加的变化规律。实验结果和计算结果解释了上滩水流对输沙速率的影响。
In a compound meandering channel, patterns of flow structures and bed variations change with increasing water depth owing to complex momentum exchange between high-velocity flow in a main channel and low-velocity flows in flood plains. We have developed a new quasi-three-dimensional model without the shallow water assumption, i.e., hydrostatic pressure distribution; our method is known as the general bottom velocity computation (BVC) method. In this method, a set of depth-integrated equations, including depth-integrated momentum and vorticity equations, are prepared for evaluating bottom velocity and vertical velocity distributions. The objective of this study is to develop a bed variation calculation method for both single and compound meandering channels by using the BVC method coupled with a sediment transport model. This paper shows that the BVC method can reproduce the pattern change of bed variation in a compound meandering channel flow with increasing relative depth. The variation in sediment transport rate due to overbank flow is explained by experimental and computational results.