The Contributions of the Largest Erosive Events to Sediment Yields in Karst Catchments
The Contributions of the Largest Erosive Events to Sediment Yields in Karst Catchments
复制标题
喀斯特流域最大侵蚀事件对产沙量的贡献
DOI：
10.1029/2019wr025839
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发表时间：
2020-07
影响因子：
5.4
通讯作者：
Wang Kelin
中科院分区：
文献类型：
--
作者：
Li Zhenwei;Xu Xianli;Zhu Jingxuan;Xu Chaohao;Wang Kelin
很大一部分土壤流失通常是由少数大型侵蚀事件产生的;这些事件是地貌过程时间压缩的主要原因。然而，在极端降雨频繁、土壤侵蚀相对严重的亚热带湿润岩溶地区，这一问题却很少受到关注。本研究的目的是研究的贡献，最大的日常侵蚀事件的年产沙量，并调查这些贡献是否取决于流量的变化，集水区的大小，和岩溶覆盖在40个选定的喀斯特流域。每个流域最大日侵蚀事件的时间序列数据按量级排序，并计算n次最大侵蚀事件产生的产沙量百分比。结果表明，几次大的侵蚀事件控制了年侵蚀产沙量。具体而言，5次最大的侵蚀事件平均产生了年产沙量的56%，而10次和25次最大的侵蚀事件分别贡献了年产沙量的69%和83%。一个集水区的流量变异性高，一般有一个最大的事件所产生的泥沙产量的很大比例。n-最大侵蚀事件产生的沉积物（%）随集水区大小呈幂函数显着减少，因此具有规模依赖性，而岩溶覆盖对这些贡献没有显着影响。该研究有助于有效地控制泥沙输移，并对亚热带湿润岩溶区的土壤侵蚀过程有更深入的了解。
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.
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影响因子：
3.3
作者：
A. Parsons;J. Wainwright;R. Brazier;D. M. Powell
通讯作者：
A. Parsons;J. Wainwright;R. Brazier;D. M. Powell
影响因子：
3.8
作者：
Zhenwei Li;Xianli Xu;Chaohao Xu;Meixian Liu;Kelin Wang;Bofu Yu
通讯作者：
Zhenwei Li;Xianli Xu;Chaohao Xu;Meixian Liu;Kelin Wang;Bofu Yu
DOI：
10.1016/s0921-8181(03)00008-0
发表时间：
2003-10
期刊：
--
影响因子：
--
作者：
J. Syvitski
通讯作者：
J. Syvitski
影响因子：
6.2
作者：
Peng, Tao;Wang, Shi-jie
通讯作者：
Wang, Shi-jie
DOI：
10.1057/9780230306912
发表时间：
2011
期刊：
--
影响因子：
--
作者：
P. Arestis;Rogério Sobreira;J. Oreiro
通讯作者：
P. Arestis;Rogério Sobreira;J. Oreiro