Method for estimating overland flow velocity on sandified slopes from measured solute transport process with bias errors
文献类型：期刊论文
| 作者 | Feng, Ren2; Wang, Fengxin2; Ban, Yunyun1; Chen, Chao2 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 589页码:16 |
| 关键词 | Flow velocity Electrolyte tracing method Sandified soil Soil erosion Overland flow |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2020.125116 |
| 通讯作者 | Wang, Fengxin(fxinwang@cau.edu.cn) |
| 英文摘要 | Sandified soil slope in the semiarid ecosystems can affect overland flow velocity to accelerate soil erosion and increase sandification. For a better understanding of flow hydraulics in wind-water erosion zone of Loess Plateau, a computation method was suggested to estimate rill flow velocities over sand incorporation slope surface of sand-loess soil mixture. The sandified slopes involved three sand incorporation rates of 10%, 20%, 50%, as light, medium and severe levels of sandification, under four inflow discharges (1, 2, 4, and 8 L min(-1)) and four slope gradients (5 degrees, 10 degrees, 15 degrees, and 25 degrees). The measured electrolyte signals over sand incorporation surfaces were found to be initially smooth in the rising limbs. After the electrolyte solution arrived at the measurement location, part of the solute infiltrated into the surface sand layer. The electrolyte solute was absorbed by the sand layer before being slowly released into the water flow. This part should be deleted before overland flow velocity estimation. Compared with published data over loess slopes, velocities over sand incorporation surface were increased by an average of 69%, 54%, 30% for sand incorporation rates of 10, 20 and 50% respectively. Incorporation of sand particles into soil could have protected soil surface from being eroded to form rougher rill morphology, to increased flow velocity. But higher sand content also could have increased the surface frictional resistance to reduce the increase rate of overland flow velocity. For aeolian-sand incorporated loess slope, both linear regression and stepwise regression implied a positive dependency of velocities on flow rates and slope gradients, but a negative dependency on sand incorporation rates. The results will improve the understanding of overland flow hydraulics on sandified slopes. |
| WOS关键词 | WATER-FLOW ; SOIL-EROSION ; RILL HYDRAULICS ; STONE CONTENT ; LOESS SLOPES ; TRACER ; DISCHARGE ; RUNOFF ; MODEL ; MULCH |
| 资助项目 | National Natural Science Foundation of China[41230746] ; National Natural Science Foundation of China[51621061] |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000568830400006 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/156917]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Wang, Fengxin |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Feng, Ren,Wang, Fengxin,Ban, Yunyun,et al. Method for estimating overland flow velocity on sandified slopes from measured solute transport process with bias errors[J]. JOURNAL OF HYDROLOGY,2020,589:16. |
| APA | Feng, Ren,Wang, Fengxin,Ban, Yunyun,&Chen, Chao.(2020).Method for estimating overland flow velocity on sandified slopes from measured solute transport process with bias errors.JOURNAL OF HYDROLOGY,589,16. |
| MLA | Feng, Ren,et al."Method for estimating overland flow velocity on sandified slopes from measured solute transport process with bias errors".JOURNAL OF HYDROLOGY 589(2020):16. |
入库方式： OAI收割
来源：地理科学与资源研究所
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