Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025839 |
The contributions of the largest erosive events to sediment yields in karst catchments | |
Zhenwei Li; Xianli Xu; Jingxuan Zhu; Chaohao Xu; Kelin Wang | |
2020-06-17 | |
发表期刊 | Water Resources Research
![]() |
出版年 | 2020 |
英文摘要 | A large proportion of the soil loss is generally produced by a small number of large erosive events; these events are primarily responsible for the time compression of geomorphic processes. This issue, however, has received little attention in subtropical humid karst areas where extreme rainfall events frequently occur and soil erosion is relatively severe. The objective of this study was to examine the contributions of the largest daily erosive events to the annual sediment yield, and to investigate whether these contributions depend on flow variability, catchment size, and karst coverage in 40 selected karst catchments. The time series data of the largest daily erosive events at each catchment were ranked by magnitude, and the percentage of the sediment yield produced by the n ‐largest erosive events was calculated. The results indicated that a few large erosive events governed the annual sediment yield. Specifically, the 5‐largest erosive events produced, on average, 56% of the annual sediment yield, while the 10‐ and 25‐largest erosive events contributed 69% and 83% of the annual sediment yield, respectively. A catchment with a high flow variability generally had a great percentage of the sediment yield produced by largest events. The sediment produced by n ‐largest erosive events (%) significantly decreased by catchment size as a power function and thus were scale dependent, while the karst coverage had no significant effect on these contributions. This study is helpful to effectively controlling sediment delivery, and provides a more in‐depth understanding of the soil erosion processes in subtropical humid karst regions. |
领域 | 资源环境 |
URL | 查看原文 |
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/276618 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Zhenwei Li,Xianli Xu,Jingxuan Zhu,et al. The contributions of the largest erosive events to sediment yields in karst catchments[J]. Water Resources Research,2020. |
APA | Zhenwei Li,Xianli Xu,Jingxuan Zhu,Chaohao Xu,&Kelin Wang.(2020).The contributions of the largest erosive events to sediment yields in karst catchments.Water Resources Research. |
MLA | Zhenwei Li,et al."The contributions of the largest erosive events to sediment yields in karst catchments".Water Resources Research (2020). |
条目包含的文件 | 条目无相关文件。 |
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。
修改评论