甘肃黑方台黄土水分运移规律模拟

doi:10.13866/j.azr.2018.04.08

Abstract

Abstract: In this study,a numerical simulation of vadose water migration in Heifangtai of Gansu Province was carried out based on the analyzed results of the saturated-unsaturated loess moisture migration by using the Hydrus-1D software.The study was based on the field experiments and the saturated-unsaturated soil moisture migration theory.The simulation was verified using the field experiments,the fitted parameters of two kinds of soil were applied,and the simulated and measured values of soil moisture content were compared and analyzed.The results showed that; ① The soil moisture content changed in a fluctuation way; ② Soil water infiltration rate and the phreatic water evaporation rate were decreased with an increase of phreatic water depth; water infiltration rates of the two kinds of soil tended to be similar when the phreatic water depth was deeper than 300 cm,and the phreatic water evaporation rate of silty loam was lower than that of homogeneous loess.In conclusion,the spatiotemporal variation of soil moisture content was significant.The study results could be referred in researching the water distribution and change of landslide.

Key words: loess, vadose zone, soil moisture migration, numerical simulation, transport mechanisms, Heifangtai, Gansu Province

SHI Lan-jun, QIAO Xiao-ying, ZENG Lei, ZHAO Gui-zhang. Loess Moisture Migration in Heifangtai of Gansu Province[J].Arid Zone Research, 2018, 35(4): 813-820.

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Loess Moisture Migration in Heifangtai of Gansu Province

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