Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions

doi:10.1007/s11629-017-4714-3

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2018 > Vol15 No.4

	Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions
	Komatsu, Yoshitaka; Kato, Hiroaki; Zhu, Bo; Wang, Tao; Yang, Fan; Rakwal, Randeep; Onda, Yuichi
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2018
卷号	15 期号:4 页码:738-751
关键词	Surface runoff Slope gradient Natural rainfall Purple soil Runoff plot
ISSN号	1672-6316
DOI	10.1007/s11629-017-4714-3
文献子类	Article
英文摘要	Purple soil is highly susceptible for overland flow and surface erosion, therefore understanding surface runoff and soil erosion processes in the purple soil region are important to mitigate flooding and erosion hazards. Slope angle is an important parameter that affects the magnitude of runoff and thus surface erosion in hilly landscapes or bare land area. However, the effect of slope on runoff generation remains unclear in many different soils including Chinese purple soil. The aim of this study was to investigate the relationship between different slope gradients and surface runoff for bare-fallow purple soil, using 5 m x 1.5 m experimental plots under natural rainfall conditions. Four experimental plots (10A degrees, 16A degrees, 20A degrees and 26A degrees) were established in the Yanting Agro-ecological Experimental Station of Chinese Academy of Science in central Sichuan Basin. The plot was equipped with water storage tank to monitor water level change. Field monitoring from July 1 to October 31, 2012 observed 42 rainfall events which produced surface runoff from the experimental plots. These water level changes were converted to runoff. The representative eight rainfall events were selected for further analysis, the relationship between slope and runoff coefficient were determined using ANOVA, F-test, and z-score analysis. The results indicated a strong correlation between rainfall and runoff in cumulative amount basis. The mean value of the measured runoff coefficient for four experimental plots was around 0.1. However, no statistically significant relationship was found between slope and runoff coefficient. We reviewed the relationship between slope and runoff in many previous studies and calculated z-score to compare with our experimental results. The results of z-score analysis indicated that both positive and negative effects of slope on runoff coefficient were obtained, however a moderate gradient (16A degrees-20A degrees in this study) could be a threshold of runoff generation for many different soils including the Chinese purple soil.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000429949900006
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/35419]
专题	Journal of Mountain Science_Journal of Mountain Science-2018_Vol15 No.4
推荐引用方式 GB/T 7714	Komatsu, Yoshitaka,Kato, Hiroaki,Zhu, Bo,et al. Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions[J]. JOURNAL OF MOUNTAIN SCIENCE,2018,15(4):738-751.
APA	Komatsu, Yoshitaka.,Kato, Hiroaki.,Zhu, Bo.,Wang, Tao.,Yang, Fan.,...&Onda, Yuichi.(2018).Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions.JOURNAL OF MOUNTAIN SCIENCE,15(4),738-751.
MLA	Komatsu, Yoshitaka,et al."Effects of slope gradient on runoff from bare-fallow purple soil in China under natural rainfall conditions".JOURNAL OF MOUNTAIN SCIENCE 15.4(2018):738-751.