Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL075317 |
Mechanics of the energy balance in large lowland rivers, and why the bed matters | |
Bray, Erin N.1,2; Dozier, Jeff3; Dunne, Thomas3 | |
2017-09-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Along many rivers, dams trap sediment and water released from the dams is clear. Downstream of the dam, temperature variability along the river is controlled by climate that warms or cools the water, the flow magnitude, and the spectral properties of water and the river's bed. Using field observations, a synoptic numerical model without calibration couples a full-spectrum radiation balance with turbulent heat fluxes, bed conduction, and a hydraulic model that estimates depth and velocity. We show that variations in the river's temperature are sensitive to the albedo of the sediment on the bed, especially at shallow depths and smaller discharges. However, about half the solar radiation lies in a spectral range where water is highly absorptive; in these wavelengths, absorption is independent of depth. In spring and summer with many hours of sunlight, releases of cold water will have limited influence on temperatures beyond tens of kilometers downstream of a dam. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411702400028 |
WOS关键词 | RADIATION ; TEMPERATURE ; FORMULA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26998 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA; 2.Univ Calif Berkeley, Ctr Environm Design Res, Berkeley, CA 94720 USA; 3.Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Bray, Erin N.,Dozier, Jeff,Dunne, Thomas. Mechanics of the energy balance in large lowland rivers, and why the bed matters[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(17). |
APA | Bray, Erin N.,Dozier, Jeff,&Dunne, Thomas.(2017).Mechanics of the energy balance in large lowland rivers, and why the bed matters.GEOPHYSICAL RESEARCH LETTERS,44(17). |
MLA | Bray, Erin N.,et al."Mechanics of the energy balance in large lowland rivers, and why the bed matters".GEOPHYSICAL RESEARCH LETTERS 44.17(2017). |
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