Faculty of Civil Engineering Subotica, University of Novi Sad, Kozaracka 2a, Subotica, 24000, Serbia.
Environ Monit Assess. 2020 Mar 19;192(4):242. doi: 10.1007/s10661-020-8100-1.
This work presents the theoretical background, development, and preliminary evaluation of a one-dimensional unsteady sediment transport and bed evolution model for a looped river network. The sediment transport and bed evolution model employs a concept that differentiates sediment particles moving in the form of suspended sediment, and near bed, and bed sediment. Applying the active layer concept, the developed model utilizes the appropriate exchange mechanisms between the suspended sediment and active layer material, which are presented in great detail. The governing transport equations were solved using the split operator approach that resulted in two successive steps. The advection equations were solved using the characteristics method, whereas the diffusion equations were discretized using the Crank-Nicholson scheme. The obtained system was complemented with additional auxiliary equations in order to allow sediment transport and bed evolution simulation at nodes, thus enabling the same in a looped river network. The derived equations were applied to develop an open-channel flow, sediment transport, and bed evolution model that was subjected to a series of preliminary numerical tests.
本文介绍了一种一维非稳态泥沙输移和河床演变模型的理论背景、开发和初步评估，该模型适用于循环河网。泥沙输移和河床演变模型采用了一种区分悬浮泥沙、近底泥沙和底床泥沙的概念。应用活动层概念，开发的模型利用悬浮泥沙和活动层物质之间的适当交换机制，这些机制被详细呈现。控制输运方程使用分裂算子方法求解，该方法导致两个连续步骤。对流方程使用特征方法求解，而扩散方程使用 Crank-Nicholson 格式离散化。为了允许在节点处进行泥沙输移和河床演变模拟，从而在循环河网中也能进行模拟，获得的系统补充了其他辅助方程。所推导的方程被应用于开发一种明渠流、泥沙输移和河床演变模型，该模型经历了一系列初步的数值测试。
