Using cesium-137 to quantify sediment source contribution and uncertainty in a small watershed
文献类型：期刊论文
| 作者 | Zhang, X. C. (John)2,5; Zhang, G. H.1,6; Liu, B. L.3,7; Liu, B.4,8 |
| 刊名 | CATENA
 |
| 出版日期 | 2016-05-01 |
| 卷号 | 140页码:116-124 |
| ISSN号 | 0341-8162 |
| 关键词 | Sediment tracer Cesium-137 Sediment source fingerprinting Mixing model Uncertainty analysis |
| DOI | 10.1016/j.catena.2016.01.021 |
| 通讯作者 | Zhang, X. C. (John)(john.zhang@ars.usda.gov) |
| 英文摘要 | Knowledge of sediment provenance is critical for precision conservation planning and calibration of soil erosion models. The objectives are to evaluate the ability of Cs-137 to apportion sediment source contributions, quantify uncertainty of the estimates, and estimate desirable sample numbers. We collected 50 surface soil samples from overland in a watershed (15.6 km(2)), 28 subsoil samples from gully bank, and 43 sediment samples in channels. The Cs-137 activity was measured by gamma spectrometry. Proportion means were calculated by solving a linear mixing model. Uncertainty was estimated by the first-order approximation and Monte Carlo (MC) simulation. The Cs-137 tracer was conservative in the fraction of <63 mu m. The Cs-137 activities differed between sources in the whole watershed at P = 0.05. The mean proportions of the <63 mu m fraction (relative error) predicted for the watershed using the mixing model were 0.42 (35%) for the overland source and 0.58 (25%) for the gully source, with a 95% confidence interval of +/- 0.145 for both. Overland source contributed most uncertainty to the proportion estimates, followed by sediment, with minimum from gully. The MC simulation predicted the same mean proportions, but with relative errors being <3% for both. Compared with the first-order approximation, MC underestimated uncertainty of the means due to the large sample number used in simulation. In general, 30 to 50 samples are needed for each source and sediment to generate reliable estimates using Cs-137. Estimated source proportions of the fine sediment may be converted to proportional contributions of total soil erosion by adjusting by particle sizes and sediment delivery ratio. No adjustment or weighting should be made directly to the mixing model unless conservativeness of the tracer is violated. Published by Elsevier B.V. |
| 收录类别 | SCI |
| WOS关键词 | FALLOUT RADIONUCLIDE TRACERS ; SOUTH-EASTERN AUSTRALIA ; SUSPENDED SEDIMENT ; SOIL-EROSION ; AGRICULTURAL CATCHMENT ; GULLIED CATCHMENT ; RIVER-BASINS ; PB-210 ; CS-137 ; WILDFIRE |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000372387100013 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2557386 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Zhang, X. C. (John) |
| 作者单位 | 1.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China 2.USDA ARS, Grazinglands Res Lab, El Reno, OK USA 3.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Gansu, Peoples R China 4.China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing, Peoples R China 5.7207W Cheyenne St, El Reno, OK 73036 USA 6.19 Xinwai St, Beijing 100875, Peoples R China 7.320 Donggangxi Rd, Lanzhou 730000, Gansu, Peoples R China 8.Chegongzhang Xilu 20,Nishasuo Dong Room 111, Beijing 100048, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, X. C. ,Zhang, G. H.,Liu, B. L.,et al. Using cesium-137 to quantify sediment source contribution and uncertainty in a small watershed[J]. CATENA,2016,140:116-124. |
| APA | Zhang, X. C. ,Zhang, G. H.,Liu, B. L.,&Liu, B..(2016).Using cesium-137 to quantify sediment source contribution and uncertainty in a small watershed.CATENA,140,116-124. |
| MLA | Zhang, X. C. ,et al."Using cesium-137 to quantify sediment source contribution and uncertainty in a small watershed".CATENA 140(2016):116-124. |
入库方式： iSwitch采集
来源：寒区旱区环境与工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。