A combined approach of experimental and numerical modeling for 3D hydraulic features of a step-pool unit
文献类型：期刊论文
| 作者 | Zhang, Chendi1,3,5; Xu, Yuncheng1,2; Hassan, Marwan A.4; Xu, Mengzhen1; He, Pukang1 |
| 刊名 | EARTH SURFACE DYNAMICS
 |
| 出版日期 | 2022-12-19 |
| 卷号 | 10期号:6页码:1253-1272 |
| ISSN号 | 2196-6311 |
| DOI | 10.5194/esurf-10-1253-2022 |
| 通讯作者 | Zhang, Chendi(chendinorthwest@163.com) ; Xu, Mengzhen(mzxu@mail.tsinghua.edu.cn) |
| 英文摘要 | Step-pool systems are common bedforms in mountain streams and have been utilized in river restoration projects around the world. Step-pool unitsexhibit highly nonuniform hydraulic characteristics which have been reported to closely interact with the morphological evolution and stability ofstep-pool features. However, detailed information on the three-dimensional hydraulics for step-pool morphology has been scarce due to the difficultyof measurement. To fill in this knowledge gap, we established a combined approach based on the technologies of structure from motion (SfM) andcomputational fluid dynamics (CFD). 3D reconstructions of bed surfaces with an artificial step-pool unit built from natural stones at six flow rateswere imported to CFD simulations. The combined approach succeeded in visualizing the high-resolution 3D flow structures for the step-pool unit. Theresults illustrate the segmentation of flow velocity downstream of the step, i.e., the integral recirculation cell at the water surface, streamwisevortices formed at the step toe, and high-speed flow in between. The highly nonuniform distribution of turbulence energy in the pool has beenrevealed, and two energy dissipaters of comparable magnitude are found to co-exist in the pool. Pool scour development during flow increase leads tothe expansion of recirculation cells in the pool, but this expansion stops for the cell near the water surface when flow approaches the criticalvalue for step-pool failure. The micro-bedforms (grain clusters) developed on the negative slope affect the local hydraulics significantly, but thisinfluence is suppressed at the pool bottom. The drag forces on the step stones increase with discharge (before the highest flow value isreached). In comparison, the lift force consistently has a larger magnitude and a more widely varying range. Our results highlight the feasibility and greatpotential of the approach combining physical and numerical modeling in investigating the complex flow characteristics of step-pool morphology. |
| WOS关键词 | FROM-MOTION PHOTOGRAMMETRY ; FLOW ; MORPHOLOGY ; CHANNEL ; STABILITY ; OPENFOAM ; RIVERS |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000898764500001 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/188556]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Chendi; Xu, Mengzhen |
| 作者单位 | 1.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 2.China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China 4.Univ British Columbia, Dept Geog, Vancouver, BC V6T1Z2, Canada 5.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Chendi,Xu, Yuncheng,Hassan, Marwan A.,et al. A combined approach of experimental and numerical modeling for 3D hydraulic features of a step-pool unit[J]. EARTH SURFACE DYNAMICS,2022,10(6):1253-1272. |
| APA | Zhang, Chendi,Xu, Yuncheng,Hassan, Marwan A.,Xu, Mengzhen,&He, Pukang.(2022).A combined approach of experimental and numerical modeling for 3D hydraulic features of a step-pool unit.EARTH SURFACE DYNAMICS,10(6),1253-1272. |
| MLA | Zhang, Chendi,et al."A combined approach of experimental and numerical modeling for 3D hydraulic features of a step-pool unit".EARTH SURFACE DYNAMICS 10.6(2022):1253-1272. |
入库方式： OAI收割
来源：地理科学与资源研究所
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