气候变化领域集成服务门户(CCPortal): An experimental investigation of the effects of thawed soil depth on rill flow velocity

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DOI	10.1002/hyp.14043
	An experimental investigation of the effects of thawed soil depth on rill flow velocity
	Gao, Xiaofeng; Shi, Xiaonan; Lei, Tingwu; Liu, Huaqing; Yang, Jiahui
通讯作者	Shi, XN (通讯作者)
发表日期	2021
ISSN	0885-6087
EISSN	1099-1085
卷号	35 期号:2
英文摘要	Water flow velocity is an important hydraulic variable in hydrological and soil erosion models, and is greatly affected by freezing and thawing of the surface soil layer in cold high-altitude regions. The accurate measurement of rill flow velocity when impacted by the thawing process is critical to simulate runoff and sediment transport processes. In this study, an electrolyte tracer modelling method was used to measure rill flow velocity along a meadow soil slope at different thaw depths under simulated rainfall. Rill flow velocity was measured using four thawed soil depths (0, 1, 2 and 10 cm), four slope gradients (5 degrees, 10 degrees, 15 degrees and 20 degrees) and four rainfall intensities (30, 60, 90 and 120 mm center dot h(-1)). The results showed that the increase in thawed soil depth caused a decrease in rill flow velocity, whereby the rate of this decrease was also diminishing. Whilst the rill flow velocity was positively correlated with slope gradient and rainfall intensity, the response of rill flow velocity to these influencing factors varied with thawed soil depth. The mechanism by which thawed soil depth influenced rill flow velocity was attributed to the consumption of runoff energy, slope surface roughness, and the headcut effect. Rill flow velocity was modelled by thawed soil depth, slope gradient and rainfall intensity using an empirical function. This function predicted values that were in good agreement with the measured data. These results provide the foundation for a better understanding of the effect of thawed soil depth on slope hydrology, erosion and the parameterization scheme for hydrological and soil erosion models.
英文关键词	rainfall; rill; rill flow velocity; soil freezing and thawing; thawed soil depth
语种	英语
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS记录号	WOS:000624003800016
来源期刊	HYDROLOGICAL PROCESSES
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/260381
推荐引用方式 GB/T 7714	Gao, Xiaofeng,Shi, Xiaonan,Lei, Tingwu,et al. An experimental investigation of the effects of thawed soil depth on rill flow velocity[J]. 中国科学院青藏高原研究所,2021,35(2).
APA	Gao, Xiaofeng,Shi, Xiaonan,Lei, Tingwu,Liu, Huaqing,&Yang, Jiahui.(2021).An experimental investigation of the effects of thawed soil depth on rill flow velocity.HYDROLOGICAL PROCESSES,35(2).
MLA	Gao, Xiaofeng,et al."An experimental investigation of the effects of thawed soil depth on rill flow velocity".HYDROLOGICAL PROCESSES 35.2(2021).