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DOI	10.1002/esp.5138
	Influence of thawed soil depth on rainfall erosion of frozen bare meadow soil in the Qinghai-Tibet Plateau
	Gao, Xiaofeng; Shi, Xiaonan; Lei, Tingwu
通讯作者	Shi, XN (通讯作者)
发表日期	2021
ISSN	0197-9337
EISSN	1096-9837
起始页码	1953
结束页码	1963
卷号	46 期号:10
英文摘要	The Qinghai-Tibet Plateau has a vast area of approximately 70x10(4) km(2) of alpine meadow under the impacts of soil freezing and thawing, thereby inducing intensive water erosion. Quantifying the rainfall erosion process of partially thawed soil provides the basis for model simulation of soil erosion on cold-region hillslopes. In this study, we conducted a laboratory experiment on rainfall-induced erosion of partially thawed soil slope under four slope gradients (5, 10, 15, and 20 degrees), three rainfall intensities (30, 60, and 90 mm h(-1)), and three thawed soil depths (1, 2, and 10 cm). The results indicated that shallow thawed soil depth aggravated soil erosion of partially thawed soil slopes under low hydrodynamic conditions (rainfall intensity of 30 mm h(-1) and slope gradient <= 15 degrees), whereas it inhibited erosion under high hydrodynamic conditions (rainfall intensity >= 60 mm h(-1) or slope gradient > 15 degrees). Soil erosion was controlled by the thawed soil depth and runoff hydrodynamic conditions. When the sediment supply was sufficient, the shallow thawed soil depth had a higher erosion potential and a larger sediment concentration. On the contrary, when the sediment supply was insufficient, the shallow thawed soil depth resulted in lower sediment erosion and a smaller sediment concentration. The hydrodynamic runoff conditions determined whether the sediment supply was sufficient. We propose a model to predict sediment delivery under different slope gradients, rainfall intensities, and thawed soil depths. The model, with a Nash-Sutcliffe efficiency of 0.95, accurately predicted the sediment delivery under different conditions, which was helpful for quantification of the complex feedback of sediment delivery to the factors influencing rainfall erosion of partially thawed soil. This study provides valuable insights into the rainfall erosion mechanism of partially thawed soil slopes in the Qinghai-Tibet Plateau and provides a basis for further studies on soil erosion under different hydrodynamic conditions.
关键词	FREEZE-THAW AGGREGATE STABILITY SEDIMENT TRANSPORT SUSPENDED-SEDIMENT MELTWATER EROSION DOKRIANI GLACIER GARHWAL HIMALAYA GANGOTRI GLACIER WINTER RUNOFF RILL
英文关键词	model; partially thawed soil; rainfall erosion; sediment delivery; sediment supply limits; soil freezing and thawing
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000653377000001
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260258
推荐引用方式 GB/T 7714	Gao, Xiaofeng,Shi, Xiaonan,Lei, Tingwu. Influence of thawed soil depth on rainfall erosion of frozen bare meadow soil in the Qinghai-Tibet Plateau[J]. 中国科学院青藏高原研究所,2021,46(10).
APA	Gao, Xiaofeng,Shi, Xiaonan,&Lei, Tingwu.(2021).Influence of thawed soil depth on rainfall erosion of frozen bare meadow soil in the Qinghai-Tibet Plateau.EARTH SURFACE PROCESSES AND LANDFORMS,46(10).
MLA	Gao, Xiaofeng,et al."Influence of thawed soil depth on rainfall erosion of frozen bare meadow soil in the Qinghai-Tibet Plateau".EARTH SURFACE PROCESSES AND LANDFORMS 46.10(2021).