Simulated headward erosion of bank gullies in the Dry-hot Valley Region of southwest China
文献类型：期刊论文
| 作者 | Su, Zhengan1 ; Xiong, Donghong1; Dong, Yifan1; Li, Jiajia1,2; Yang, Dan1; Zhang, Jianhui1; He, Guangxiong3
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| 刊名 | GEOMORPHOLOGY
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| 出版日期 | 2014 |
| 卷号 | 204页码:532-541 |
| ISSN号 | 0169-555X |
| 关键词 | Headward erosion Landform change DEM Fractal dimension |
| 通讯作者 | Donghong Xiong |
| 合作状况 | 国内 |
| 英文摘要 | Although the development and migration of gully headcuts can increase soil loss and accelerate landscape degradation considerably, little attention has been paid to the spatiotemporal variations of the morphological characteristics of bank gully heads in the Dry-hot Valley Region of southwest China. This study explored the in-situ variations in soil loss rates and morphological characteristics in active bank gully heads, testing the overland flow discharge with a range of 30 to 120 L min(-1). In response to this flow, actively migrating headcuts developed with retreat rates ranging from 2.6 to 7.9 mm h(-1). All experimental runs resulted in a gradual increase in soil loss volume, incision depth, and retreat distance over time due to set flow rates. For the gully beds and upstream areas of gully heads, the soil erosion rates were greatest at the beginning of each run and progressively decreased during the scouring test. Non-steady state soil erosion rates were observed in the headwall for the flow discharge levels examined for this study. This was due to an abrupt slope collapse after long-term scouring effects. As degradation progressed, similar trends emerged for temporal variations within the fractal dimensions of topographic surfaces, in both the gully heads and upstream areas. After the scouring was run for a period of 90 min, asymptotic fractal dimensions of topographic surfaces were attained in the upstream areas and gully heads, suggesting that steady state morphological characteristics had been realised. It should be noted that headwall collapses are typically associated with a substantial increase in sediment yield where no other obvious change in morphological characteristics occurs in the headwall. Therefore, even though a significant difference in the soil erosion rates and fractal dimensions of topographic surface values could be found between the bank gully heads and upstream areas, the temporal variation in the morphological characteristics of bank gully heads was similar to those observed in upstream areas where ephemeral gullies developed. (C) 2013 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geography, Physical ; Geosciences, Multidisciplinary |
| 研究领域[WOS] | Physical Geography ; Geology |
| 关键词[WOS] | UPLAND CONCENTRATED FLOWS ; DIGITAL ELEVATION MODELS ; HEADCUT DEVELOPMENT ; EPHEMERAL GULLIES ; CHANNEL ; SPAIN ; SOIL ; ENVIRONMENT ; RESOLUTION ; AUSTRALIA |
| 收录类别 | SCI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S0169555X1300439X |
| 语种 | 英语 |
| WOS记录号 | WOS:000328234200042 |
| 公开日期 | 2013-11-17 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/6507]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China 2.Chengdu Univ Informat Technol, Dept Environm Engn, Chengdu 610225, Peoples R China 3.Yunnan Acad Agr Sci, Inst Trop Ecoagr Sci, Yuanmou 651300, Peoples R China |
| 推荐引用方式 GB/T 7714 | Su, Zhengan,Xiong, Donghong,Dong, Yifan,et al. Simulated headward erosion of bank gullies in the Dry-hot Valley Region of southwest China[J]. GEOMORPHOLOGY,2014,204:532-541. |
| APA | Su, Zhengan.,Xiong, Donghong.,Dong, Yifan.,Li, Jiajia.,Yang, Dan.,...&He, Guangxiong.(2014).Simulated headward erosion of bank gullies in the Dry-hot Valley Region of southwest China.GEOMORPHOLOGY,204,532-541. |
| MLA | Su, Zhengan,et al."Simulated headward erosion of bank gullies in the Dry-hot Valley Region of southwest China".GEOMORPHOLOGY 204(2014):532-541. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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