Field infiltration of artificial irrigation into thick loess

doi:10.1016/j.enggeo.2021.106388

	Field infiltration of artificial irrigation into thick loess
	Zhao, Zhiqiang 3; Dai, Fuchu 3; Min, Hong 2; Tu, Xinbin 1
刊名	ENGINEERING GEOLOGY
	2021-12-05
卷号	294 页码:12
关键词	Loess Field monitoring Infiltration process Wetting front Preferential flow Pore-air pressure
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2021.106388
英文摘要	Frequent agricultural irrigation triggers numerous landslides in the loess platform, northwest China. We conducted a field infiltration experiment with a diameter of 20 m on the South Jingyang tableland in Shaanxi province, China to better understand the infiltration process in thick unsaturated loess. Soil moisture probes, tensiometers, and differential pressure transducers were installed at various depths to monitor the infiltration process. The results showed that the initially high infiltration rate gradually decreased and finally approached a constant value less than that of the saturated hydraulic conductivity of the top soil. Matric suction decreased rapidly, and the volumetric water content increased to a nearly saturated state with the arrival of the wetting front. The soil water characteristic curve obtained from field monitoring data agreed with that from laboratory tests performed on undisturbed specimens. Preferential flow associated with vertical cracks parallel to the margin of the platform was observed in the late Pleistocene Loess layer (L-1), and an empirical model was developed from monitoring recordings to explain preferential flow formation. A transient perched water table formed above the lower part of the first paleosol layer (S-1). The monitored pore-air pressure increased and then fluctuated before the arrival of the wetting front. The maximum value of pore-air pressure at different depths was less than 5 kPa and tended to increase linearly with dry density. The results of this research help understand the migration of irrigation water in thick unsaturated loess and the recharge mechanism of the deep groundwater table.
资助项目	Major Program of National Natural Science Foundation of China[41790440]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000703066300018
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28540]
专题	中科院武汉岩土力学所
通讯作者	Dai, Fuchu
作者单位	1.State Grid Econ & Technol Res Inst Co Ltd, Beijing 102209, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China 3.Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Zhiqiang,Dai, Fuchu,Min, Hong,et al. Field infiltration of artificial irrigation into thick loess[J]. ENGINEERING GEOLOGY,2021,294:12.
APA	Zhao, Zhiqiang,Dai, Fuchu,Min, Hong,&Tu, Xinbin.(2021).Field infiltration of artificial irrigation into thick loess.ENGINEERING GEOLOGY,294,12.
MLA	Zhao, Zhiqiang,et al."Field infiltration of artificial irrigation into thick loess".ENGINEERING GEOLOGY 294(2021):12.