A device and method for in-situ measurement of rainfall infiltration parameters

Abstract

The invention discloses a device and a method for measuring rainfall infiltration parameters in situ, including a water supply system and an infiltration area. The water supply bottle includes a water tank and a closed water tank arranged above the water tank. Water pipes, inlet pipes and outlet pipes all extend into the water tank. The raindrop simulation device includes barbed wire and a number of drip outlets installed on the wire mesh. The bottom of the water tank is connected to the drip outlets through connecting water pipes; it constitutes a water supply system that can simulate different rainfall intensities , compared with the existing rainfall simulator, it is very economical and easy to operate; the effective infiltration area adopts the method of grouting curtain to isolate the soil in the test area from the surrounding soil, avoiding the side flow of water during infiltration, It also avoids the interference of the external environment such as evapotranspiration, and can also obtain the time required for the wet soil in the research area to drain water under natural conditions.

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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