Device for in-situ rainfall infiltration parameter testing and testing method

Abstract

The invention discloses a device for in-situ rainfall infiltration parameter testing and a testing method. The device comprises a water supply system and an infiltration area, wherein a water supply bottom comprises a water tank and a sealed water tank arranged above the water tank; a gas inlet tube and a water outlet tube are arranged at the bottom of the sealed water tank; both the gas inlet tube and the water outlet tube extend into the water tank; a rain droplet simulation device comprises an iron wire net and a plurality of water dropping holes in the iron wire net; the bottom of the water tank is communicated with the water dropping holes through connecting water tubes. A water supply system for simulating different rainfall intensities is established, and compared with a conventional rainfall simulator, the device is very economic and practical and convenient to operate; in an effective infiltration area, a testing area soil body is isolated from a peripheral soil body by usinga grouting curtain method, water is prevented from lateral flowing in the infiltration process, interference of external environments such as evapotranspiration is also avoided, and meanwhile the timethat moisture is completely discharged from wet soil in a research area under natural conditions can be also acquired.

Description

technical field [0001] The invention relates to the fields of hydrogeology and engineering geology, in particular to an in-situ device and method for measuring rainfall infiltration parameters. Background technique [0002] Parameters related to rainfall infiltration, such as infiltration rate and infiltration depth, play an important role in storm flood management, geological disaster prevention, and development of agriculture, forestry and animal husbandry. For storm flood management, SWMM-Horton model is commonly used in China to simulate a single precipitation event or long-term water quantity and water quality simulation in a city. The parameters required in the model are maximum infiltration rate, minimum infiltration rate, decay constant, withering point, drain time, and maximum infiltration volume. For the above six parameters, in practice, empirical constants are generally used or approximated by double-loop tests, single-loop tests or even saturated infiltration c...

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Problems solved by technology

[0005] In view of the deficiencies in the existing technology, in order to solve the existing in-situ method of measuring the unsaturated infiltration coefficient (single-ring method, double-ring method), the diffusion of infiltration to the surroundings cannot be controlled, the air cannot be exhausted, and the actual rainfall conditions cannot be simulated, etc. The object of the present invention is to provide a device and method for in-situ measurement of maximum infiltration rate, minimum infiltration rate, decay constant, withering point, drain time, maximum infiltration volume, and has high measurement accuracy, The advantages of easy operation and recyclable use solve the shortcomings of commonly used in-situ measurement of soil infiltration rate, and provide a more accurate reference for the assignment of parameters in the SWMM-Horton model

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