干旱区生态环境知识资源中心(Arid): In-situ test research on regularities of water migration in loess

Arid

	In-situ test research on regularities of water migration in loess
	Li Ping; Li Tong-lu; Wang A-dan; Zhang Ya-guo; Liang Yan; Zhao Ji-fei
通讯作者	Li, P
来源期刊	ROCK AND SOIL MECHANICS
ISSN	1000-7598
出版年	2013
卷号	34 期号:5 页码:1331-1339
英文摘要	It is an indisputable fact that rainfall can induce landslides in loess area; however, groundwater levels are always very deep in loess area. At present, it is not clear that how does rainfall move in loess and whether it affects groundwater directly when infiltrating ground below. In order to simulate the natural rainfall condition, manual drip experiment is carried out. By using soil moisture meters which are inserted into the wall at a 10 m-deep exploratory well, the changes of moisture content with time of soil layers at different depths in the process of artificial rainfall infiltration could be easily observed; the range affected by rainfall could be confirmed later. The result shows that moisture content of soil layers within 0.5 m changed obviously when the precipitation is 3.82 mm/d (light rain), while that of below have almost no changes; the moisture content within 1 m increases when the precipitation is 10.31 mm/d (moderate rain); the moisture content of the layers within 1 m increases significantly, and that of between 1 m to 1.6 m have a slight rise when the precipitation reached 25.21 mm/d (heavy rain), the changes of moisture content lag and the growth decreases gradually with depth. It is shown that if there are no obvious water paths in arid loess region, the infiltration depth of short-term rainfall is limited and it is difficult to reach the groundwater level, but according to the results of paleosol in deeper, the moisture content of paleosol has a considerable increase even though that of upper loess is relatively weak, which indicates that unsaturated seepage or vapor migration do exist in loess. It is also found that the circulation of soil moisture is primarily occurred in evaporation zone; that within shallow 0.7 m in Longdong Loess Plateau, if there is no recharge from follow-up rainfall, the rainfall infiltrated within evaporation zone will be excreted upward by evaporation; however, it will continue to move downward without the influence of evaporation when infiltrating beyond the evaporation zone; the water will gather on the surface as encountering the impervious layer, which is also reflected preferably by finite element simulation.
英文关键词	soil moisture volumetric water content infiltration rainfall loess soil-water characteristic curve permeability coefficient
类型	Article
语种	中文
收录类别	ESCI
WOS记录号	WOS:000409800200017
WOS关键词	LANDSLIDE-HAZARD ; RAINFALL
WOS类目	Engineering, Geological
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/330475
作者单位	[Li Ping; Li Tong-lu; Zhao Ji-fei] Changan Univ, Sch Geol Engn & Surveying, Dept Geol Engn, Xian 710054, Shaanxi, Peoples R China; [Wang A-dan; Zhang Ya-guo] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China; [Liang Yan] Changan Univ, Sch Highway, Key Lab Educ Minist Highway Engn Special Reg, Xian 710064, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Li Ping,Li Tong-lu,Wang A-dan,et al. In-situ test research on regularities of water migration in loess[J],2013,34(5):1331-1339.
APA	Li Ping,Li Tong-lu,Wang A-dan,Zhang Ya-guo,Liang Yan,&Zhao Ji-fei.(2013).In-situ test research on regularities of water migration in loess.ROCK AND SOIL MECHANICS,34(5),1331-1339.
MLA	Li Ping,et al."In-situ test research on regularities of water migration in loess".ROCK AND SOIL MECHANICS 34.5(2013):1331-1339.