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| DOI：10.13522/j.cnki.ggps.20180258 |
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| Comparison of Different Spatial Meshes for Modelling Water Flow in Flood-control Protection Area of Wuwei Levee |
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LU Xianhe, GAO Qingfang, WANG Xinfu, WANG Fengzuo
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Yellow River Consulting Company, Zhengzhou 450000, China
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| Abstract: |
| 【Objective】Meshing the terrain in use of the MIKE model to simulate water flow in river could give rise to errors in calculating the ability of the channel to conduct water, and this paper aims to compare the performance of different mesh methods. 【Method】We compared the pros and cons of triangular mesh network, the hybrid grid network and the one-dimension two-dimension coupling scheme.【Result】The triangular mesh resulted in errors in calculating water flow in the channel. The hybrid network was adequate to describe water flow in the river, but led to a dispersive interface between the river bank and the protection area. The two-dimensional coupling scheme captured water flow in the river, but underestimated the risk of flood in the embankment area. Triangular mesh was computationally demanded but gave accurate results by refining the meshes in the river. The hybrid grid scheme was computationally complicated, but was two time faster than the triangle grid scheme. The two-dimensional coupling scheme was five times faster than the triangle grid scheme, but its accuracy depends on spacing of the cross-section and it was suitable only when the river embankment is not much higher than the river bed.【Conclusion】The channel acts as the main flood channel in flood-controlled protected area, and different meshes could give different results and they are case-dependent and therefore should be used with care. |
| Key words: flood risk analysis; MIKE; moder; numerical simulation |
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