您好，欢迎访问云南省农业科学院 机构知识库！

Simulated headward erosion of bank gullies in the Dry-hot Valley Region of southwest China

文献类型： 外文期刊

作者： Su, Zhengan 1 ; Xiong, Donghong 1 ; Dong, Yifan 1 ; Li, Jiajia 1 ; Yang, Dan 1 ; Zhang, Jianhui 1 ; He, Guangxiong 3 ;

作者机构： 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

关键词： Headward erosion;Land form change;DEM;Fractal dimension

期刊名称：GEOMORPHOLOGY （ 影响因子：4.139； 五年影响因子：4.623 ）

ISSN：

年卷期：

页码：

收录情况： SCI

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.

  • 相关文献

[1]基于GIS的梅里雪山国家公园土壤侵蚀敏感性情景分析. 张志明,尹梅,孙振华,王文礼,欧晓昆. 2011

作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：云南省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台