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Step-pool morphology in ephemeral gullies on steep slopes of the Loess Plateau: comparisons with other linear erosion features

文献类型：期刊论文

作者Liang, Wenqian1,2; Xu, Ximeng1,2; Zheng, Fenli2,3
刊名GEOMORPHOLOGY
出版日期2025-11-15
卷号489页码:110007
关键词Soil erosion LiDAR Transport capacity Steepness ratio
ISSN号0169-555X
DOI10.1016/j.geomorph.2025.110007
产权排序1
文献子类Article
英文摘要Step-pool morphology has a great impact on hydraulic resistance and energy dissipation, closely associated with channel stability. The occurrence of the maximum flow resistance condition suggests maximum channel stability, which has been widely found in linear erosion features including streams and rills. However, step-pool morphology in ephemeral gullies (EGs) on steep slopes remains unclear, compared with other linear erosion features. Thus, field investigation was conducted in the two EGs on steep slopes of the Chinese Loess Plateau. The H/L and (H/L)/S of 171 step-pools in the two EGs (64 % and 58 % slope gradients) were analyzed and compared with eight sets of literature data in other linear erosion features, where H, L, and S represent step height, step spacing, and channel slope gradient, respectively. The results demonstrated that the step-pool morphology in EG channels of the study area was controlled by S. Steeper channel slope led to larger step-pool instability. H/L increased with the S, ranging from 0.11 to 1.00. In the two EGs, the maximum flow resistance condition occurred in half of step-pools with (H/L)/S ranging from 1 to 2, while another half of step-pools had (H/L)/S below 1, indicating fewer stable arrangements, and were predominantly found at S larger than 0.4. By incorporating monitored data from EGs and literature data from other linear erosion features, the relationship between step-pool morphology and channel slope gradient was also identified. H/L increased linearly with S, while (H/L)/S decreased as S increased, following a power function. When S was between 0.068 and 0.448, the (H/L)/S fell into the range of 1 to 2, representing the occurrence of the maximum flow resistance condition. This study fills a gap in understanding step-pool morphology in EGs on steep slopes by comparing with other linear erosion features and underscores the critical role of channel slope gradient.
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WOS关键词BED-STEPS ; CHANNEL ; STREAMS ; FLOW ; DEFORESTATION ; HYDRAULICS ; ADJUSTMENT ; REGION
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:001582747700001
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/217497]  
专题陆地水循环及地表过程院重点实验室_外文论文
通讯作者Xu, Ximeng
作者单位1.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Northwest A&F Univ, State Key Lab Soil & Water Conservat & Desertifica, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Liang, Wenqian,Xu, Ximeng,Zheng, Fenli. Step-pool morphology in ephemeral gullies on steep slopes of the Loess Plateau: comparisons with other linear erosion features[J]. GEOMORPHOLOGY,2025,489:110007.
APA Liang, Wenqian,Xu, Ximeng,&Zheng, Fenli.(2025).Step-pool morphology in ephemeral gullies on steep slopes of the Loess Plateau: comparisons with other linear erosion features.GEOMORPHOLOGY,489,110007.
MLA Liang, Wenqian,et al."Step-pool morphology in ephemeral gullies on steep slopes of the Loess Plateau: comparisons with other linear erosion features".GEOMORPHOLOGY 489(2025):110007.

入库方式： OAI收割

来源：地理科学与资源研究所

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