Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.geomorph.2015.09.011 |
Dryland anabranching river morphodynamics: Rio Capilla, Salar de Uyuni, Bolivia | |
Li, Jiaguang1; Bristow, Charlie S.2; Luthi, Stefan M.3; Donselaar, Marinus E.3 | |
通讯作者 | Li, Jiaguang |
来源期刊 | GEOMORPHOLOGY |
ISSN | 0169-555X |
EISSN | 1872-695X |
出版年 | 2015 |
卷号 | 250页码:282-297 |
英文摘要 | The dryland anabranching river Rio Capilla is characterized by nonvegetated and vegetated reaches with prominent channel morphology. To identify the morphodynamics of such dryland anabranching systems and their controls, we investigated the Rio Capilla of the southern Altiplano Plateau using high-resolution satellite imagery and field measurements. Comparison of high-resolution satellite data reveals that erosion exceeds deposition for the main channel, accompanied by changes in channel planform, such as meander and channel morphology. On-site surveys combined with high-precision GPS and high-resolution satellite imagery show that channels are characterized by shallowness and poor development of levees. The study area of the Rio Capilla is divided into two zones of different slopes: zone 1 with a high slope and zone 2 with a low slope. Zone 1 has a relatively straight main channel with few anabranches and grass-covered banks that are stable despite the high gradient; whereas zone 2 is typified by more anabranches with nonvegetated banks, and the main channel experiences prominent bank accretion and erosion. Excavations show that point-bar deposits are fine-sand-dominated in two reaches and that river banks primarily consist of silt and clay. The limited vegetation cover and abundance of desiccation cracks and macropores make the river bank more erodible leading to pronounced lateral migration in this low-gradient dryland river system. Shallow channels and poor development of levees in combination with in-channel accretionary benches result in frequent overbank flooding, which results in a high density of crevasse splays over unconsolidated river banks and accretionary benches. Connection of headcuts and crevasse channels together with lateral migration and chute channels and reactivation of partially abandoned meanders produces an anabranching pattern in such dryland river systems. (C) 2015 Elsevier B.V. All rights reserved. |
英文关键词 | Dryland Anabranching river River bank dynamics Channel planform |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; England ; Netherlands |
收录类别 | SCI-E |
WOS记录号 | WOS:000364266800022 |
WOS关键词 | ARID CENTRAL AUSTRALIA ; BANK EROSION ; CENTRAL ANDES ; DIGITAL PHOTOGRAMMETRY ; ANASTOMOSING RIVERS ; NORTHERN ALTIPLANO ; MEANDERING RIVERS ; LANDSAT IMAGERY ; CHANNEL CHANGES ; FORELAND BASIN |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/187531 |
作者单位 | 1.China Univ Geosci, Minist Educ, Key Lab Tecton & Petr Resources, Wuhan 430074, Hubei, Peoples R China; 2.Univ London, Dept Earth & Planetary Sci, London WC1E 7HX, England; 3.Delft Univ Technol, Dept Geosci & Engn, NL-2628 CN Delft, Netherlands |
推荐引用方式 GB/T 7714 | Li, Jiaguang,Bristow, Charlie S.,Luthi, Stefan M.,et al. Dryland anabranching river morphodynamics: Rio Capilla, Salar de Uyuni, Bolivia[J],2015,250:282-297. |
APA | Li, Jiaguang,Bristow, Charlie S.,Luthi, Stefan M.,&Donselaar, Marinus E..(2015).Dryland anabranching river morphodynamics: Rio Capilla, Salar de Uyuni, Bolivia.GEOMORPHOLOGY,250,282-297. |
MLA | Li, Jiaguang,et al."Dryland anabranching river morphodynamics: Rio Capilla, Salar de Uyuni, Bolivia".GEOMORPHOLOGY 250(2015):282-297. |
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