Experimental study of shallow mass movements on gully slopes and associated sediment under rainfall on the Chinese loess plateau
Experimental study of shallow mass movements on gully slopes and associated sediment under rainfall on the Chinese loess plateau
复制标题
黄土高原降雨条件下沟坡浅层物质运动及伴生沉积物试验研究
DOI：
10.1016/j.geomorph.2019.106919
复制
发表时间：
2020-02
期刊：
影响因子：
3.9
通讯作者：
Liu Yakun
中科院分区：
文献类型：
--
作者：
Guo Wenzhao;Xu Xiangzhou（徐向舟）;Wang Wenlong;Zhu Tongxin;Liu Yakun
沟坡上的物质运动是沟岸扩展的主要贡献者，也是向河流输送沉积物的主要来源;然而，它们往往被忽视，因为它们太小或太耗时，无法在野外测量。为了解决这一难题，采用一种新型地形仪对黄土高原沟壑区坡面浅层物质运动进行了模拟降雨观测。试验结果表明，浅层质量累积移动量随降雨量的增加而递增。在降雨强度为50 mm h−1时，发生浅层物质移动的临界降雨量约为28 mm。研究结果还表明，土壤含水量是控制浅层土体运动发生的关键因素，10-20 cm土层允许浅层土体运动的最低土壤含水量为23.1-25.6%。沟坡浅层物质运动对侵蚀产沙有重要影响。在质量运动故障的泥沙浓度和输沙率的平均值分别为3.6倍和4.0倍，在故障前的事件。我们的研究结果有重要的意义，了解在丘陵沟壑流域沟坡泥沙排放和质量运动的连接。
Mass movements on gully slopes are the main contributors to gully-bank expansion and are the major source of sediment delivered to rivers; however, they are often overlooked because they are either too small or too time‐consuming to measure in the field. To resolve this challenge, a novel topography meter was used to observe shallow mass movements on the gully slopes of the Loess Plateau under simulated rainfall. The experiment showed that the cumulative shallow mass movement volume logarithmically increased with the rainfall amount. The critical rainfall for shallow mass movement occurrence was about 28 mm at a rainfall intensity of 50 mm h−1. The results also show that soil water content was a key element controlling the occurrence of the shallow mass movements, and the minimal soil water content for permitting shallow mass movements was about 23.1–25.6% for 10–20 cm deep soil. Shallow mass movement on gully slopes has a significant influence on sediment yield. The sediment concentration and sediment transport rate during mass movement failure were on average 3.6 times and 4.0 times higher than that during pre-failure events, respectively. Our results have important implications for understanding the connectivity of sediment discharge and mass movements on gully slopes in hilly and gully watersheds.
登录
查看更多内容
影响因子：
3.9
作者：
Chen, Yi-chin;Chang, Kang-tsung;Chiang, Shou-hao
通讯作者：
Chiang, Shou-hao
影响因子：
3.3
作者：
J. Nyssen;J. Poesen;M. Veyret-Picot;J. Moeyersons;M. Haile;J. Deckers;J. Dewit;J. Naudts;K. Teka;Gerard Govers
通讯作者：
J. Nyssen;J. Poesen;M. Veyret-Picot;J. Moeyersons;M. Haile;J. Deckers;J. Dewit;J. Naudts;K. Teka;Gerard Govers
影响因子：
3.9
作者：
Guo Wenzhao;Luo Li;Wang Wenlong;Liu Zhenyi;Chen Zhuoxin;Kang Hongliang;Yang Bo
通讯作者：
Yang Bo
影响因子：
3.9
作者：
K. E. Jones;N. Preston
通讯作者：
K. E. Jones;N. Preston
讲述不同的故事：植被在中国黄土高原降雨期间引发浅层滑坡的促进作用
影响因子：
3.9
作者：
Wenzhao Guo（郭文召）;Zhuoxin Chen;Wenlong Wang;Wenwang Gao;Mingming Guo;Hongliang Kang;Pengfei Li;Wenxin Wang;Man Zhao
通讯作者：
Man Zhao