Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China
文献类型：期刊论文
| 作者 | Han, Qingjie1,2; Qu, Jianjun1,2; Zhang, Kecun1; Zu, Ruiping1; Niu, Qinghe1; Liao, Kongtai1 |
| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2009-03-15 |
| 卷号 | 104期号:3-4页码:230-237 |
| 关键词 | Entrainment Erosion Moisture content Wind tunnel experiment Tropical humid coast Southern China |
| ISSN号 | 0169-555X |
| DOI | 10.1016/j.geomorph.2008.08.016 |
| 通讯作者 | Han, Qingjie(hqjecology@163.com) |
| 英文摘要 | Wind erosion has major impacts on dune growth, desertification, and architecture on sea coasts. The deflation threshold shear velocity is a crucial parameter in predicting erosion, and surface moisture greatly affects this threshold and thus sand stability. Wind tunnel studies have shown that reduced moisture contents decrease entrainment thresholds and increase wind erosion, but field and wind tunnel test data is lacking for tropical humid coastal areas. In this study, we investigated the influence of surface moisture contents (at I mm depth) on sand entrainment and erosion using tropical humid coastal sands from southern China. Shear velocities were deduced from velocity profiles above the sand. The threshold shear velocity increased linearly with increasing ln100M (14, gravimetric moisture content). The increase was steepest below a moisture content of 0.0124 (i.e., at M-1.5, the moisture content in the sand at a matric potential of - 1.5 MPa). We compared several popular models that predict threshold shear velocity of moisture sediment, and found substantial differences between their predicted results. At a surface moisture content of 0.0124, the predicted increase in the wet threshold shear velocity compared with the dry threshold shear velocity ranged from 34% to 195%. The empirical model of Chepil and Selah simulated the data well for M<0.0062 (i.e., 03M(1.5)), whereas Belly's empirical model simulated the data best for M>0.0062. Wind erosion modulus increased with increasing effective wind velocity following a power function with a positive exponent at all moisture contents, but decreased with increasing surface moisture content following a power function with a negative exponent. When wind speed and moisture content varied simultaneously, wind erosion modulus was proportional to the 0.73 power of effective wind velocity, but inversely proportional to the 1.48 power of M. The increase in resistance to erosion at low moisture contents probably results from cohesive forces in the water films surrounding the sand particles. At a moisture content near M1.5, wind erosion ceases nearly for all wind velocities that we tested. (C) 2008 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | SOIL-MOISTURE ; THRESHOLD ; SEDIMENT ; WATER ; FIELD ; VELOCITY ; DUNES |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000263429200012 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556226 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Han, Qingjie |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Desert & Desertificat, CAREERI, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Dunhuang Gobi & Desert Ecol & Environm Res Stn, CAREERI, Dunhuang 736200, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Han, Qingjie,Qu, Jianjun,Zhang, Kecun,et al. Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China[J]. GEOMORPHOLOGY,2009,104(3-4):230-237. |
| APA | Han, Qingjie,Qu, Jianjun,Zhang, Kecun,Zu, Ruiping,Niu, Qinghe,&Liao, Kongtai.(2009).Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China.GEOMORPHOLOGY,104(3-4),230-237. |
| MLA | Han, Qingjie,et al."Wind tunnel investigation of the influence of surface moisture content on the entrainment and erosion of beach sand by wind using sands from tropical humid coastal southern China".GEOMORPHOLOGY 104.3-4(2009):230-237. |
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