发布时间：2025-12-02

文章标题：【学术成果】一篇通讯作者文章在国际学术期刊 Earth Surface Processes and Landforms 上发表

内容：

通过结合细胞自动机模拟与流场本征正交分解（POD）技术，我们揭示了沙障几何特征对控沙性能的影响机理，并创新性地提出了一种可用于普适性评估沙障效率的流体力学指标。

 

Cited as: Lin, Y., Zhang, Y., Guan, K., Yang, B. & Gao, X. (2025) Sand barrier performance in real-space cellular automaton simulation: A flow decomposition analysis. Earth Surface Processes and Landforms, 50(15), e70224.

https://doi.org/10.1002/esp.70224

 

Abstract: This study proposes a fluid dynamic parameter to evaluate the performance of sand barriers. Using a cellular automaton model, the migration of barchan dune chains in the presence of different types of non-porous sand barriers is simulated. A temporal indicator characterising the sand barrier's sand-blocking effect is introduced to evaluate the effects of the cross-sectional shape and aspect ratio of the sand barrier. Furthermore, a fluid dynamic parameter—the singular value σ2 characterising the energy of the second-order proper orthogonal decomposition (POD) mode—is proposed via POD to combine the geometric characteristics of the sand barrier with the kinetic characteristics implied by the surrounding flow. It is found that this parameter is negatively correlated with the sand-blocking effect, which is supported by the test that changes the height of the sand barrier. Therefore, the proposed fluid dynamic parameter can provide a reference for the design of sand barriers in sand control projects.

FIGURE. Flow structure around the sand barrier analysed using POD. (a) Time-averaged stream-wise velocity field during at t∈[20000t₀, 30000t₀], with lines representing streamlines. (b) First five modes of the dimensionless streamwise velocity u/uin at the cross-section of y = 200 l₀. (c) Singular values of the POD modes versus the mode number j. The sand barrier with a semi-elliptical cross-section depicted in Figure 2 is used here as an example. All POD modes are computed based on the dimensionless streamwise velocity u/uin in the region of x∈[600 l₀, 1000 l₀], y = 200 l₀ and z∈[0, 500 l₀] at t∈[20000 t₀, 30000 t₀]. The dashed line indicates an exponential law. POD, proper orthogonal decomposition