地理科学进展

PROGRESS IN GEOGRAPHY ›› 2010, Vol. 29 ›› Issue (2): 173-178.doi: 10.11820/dlkxjz.2010.02.007

• Original Articles • Previous Articles     Next Articles

Experimental Research on Characteristics and Affecting Factors of Finger Flow during Redistribution in Sandy Soil

LI Heli1,2,3, LI Huaien2, XU Yanling4   

  1. 1. Institute of Geographic Science and Natural Resources Research, CAS, Beijing 100101, China; |
    2. Key Laboratory of Water Resources, Environmental and Ecology in Northwest China, Ministry of Education|
    Xi'an University of Technology, Xi'an 710048, China|
    3. Graduate University of Chinese Academy of Sciences, CAS, Beijing 100049, China；
    4. Beijing Municipal Institute of Science and Technology Information, Beijing 100044, China
  • Online:2010-02-25 Published:2010-02-25

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Abstract:

The process of water transferring through soil zone can be divided into two phases: the foregoing infiltration and the following redistribution. Finger flow as a form of the preferential flow of water, differs from macro-pore flow and funnel flow. It has been validated that finger flow can occur during the redistribution following the infiltration of soil water. However, domestic studies on finger flow are very few at present, and cognition about it is very scarce either. Hereby, in this paper, the experiments were designed to discuss the characteristics and the effects of different factors on the development of finger flow during redistribution with a sandy soil. The affecting factors included the quantity of the water supplied in prior process of infiltration, the size of the experimental box, the fluid characteristics and so on. The major results are as follows: finger flow can develop easily during water redistribution process with prior sufficient water supply; the quantity of water increased in prior process of infiltration has little influence on the final form of finger flow developed whereas quickens the speed of the finger flow development; the smaller experiment box can restrain the development of finger flow；the finger flow develops faster with a clearer form during the water redistribution process when the concentration of simplex solution is increased, but when compared with the experiment in which tap water is used, the experimental result is reversed.

Key words: affecting factors, experimental research, finger flow, redistribution