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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 288-298.DOI: 10.7522/j.issn.1000-694X.2022.00147

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Simulation of soil moisture and leakage characteristics of mobile dunes in Mu Us Sandy Land

Guangyu Hong1(), Xiaojiang Wang1(), Qingpu Su2, Long Hai1, Shaokun Wang3, Xiaowei Gao1, Yanyan Xu4, Jingshan Zhou5, Zhuofan Li1, Zihao Li1, Ercha Hu1   

  1. 1.Inner Mongolia Academy of Forestry Sciences,Hohhot 010010,China
    2.Publicity Department of CPC Wushen Banner Committee,Wushen Banner 017300,Inner Mongolia,China
    3.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    4.Daqingshan National Nature Reserve Administration of Inner Mongolia Autonomous Region,Hohhot 010010,China
    5.Comprehensive Security Center of Forestry and Grassland Bureau of Inner Mongolia Autonomous Region,Hohhot 010010,China
  • Received:2022-10-24 Revised:2022-12-12 Online:2023-03-20 Published:2023-04-12
  • Contact: Xiaojiang Wang

Abstract:

The main supply of soil water comes from precipitation, which determines the changes of soil water patterns spatially and temporally in arid and semi-arid areas. Precipitation also plays a key role in the supply of soil water at different soil depths in sandy areas. In this study, the hydro 1D model with optimized parameters was used to analyze the variation characteristics of soil water leakage at different depths of 10, 30, 50, 70, 90 and 110 cm in the mobile dunes of Mu Us Sandy Land and its response to different rainfall patterns. The results showed that the amount of soil water leakage was different at different soil depths in mobile dunes from May to September. The amount of water leakage decreased along the increase of the soil depth from May to August. The amount of water leakage increased along the increase of the soil depth in September. The changes of water leakage was consistent with precipitation. The maximum water leakage occurred in August, that the amount of soil water leakage was 148.51 mm at the depth of 110 cm, accounting for 67.5% of the monthly precipitation. The maximum leakage rate and the maximum leakage amount accompanied with large rainfall events. The amount of rainfall and the initial soil water content jointly determined the soil water leakage rate and duration. The soil water will infiltrate to 110 cm when the rainfall reached to 14.8 mm, and the cumulative leakage reaching the maximum leakage rate is 1.89 mm, accounting for 13.69% of the precipitation. Continuous precipitation events are conducive to recharge the deep water, and they shorten the time when the leakage rate reaches the peak in each soil layer Our results from the estimation of soil water leakage in sandy soils could provide theoretical basis in the assessment of water resources and water demand for ecological construction in arid and semi-arid regions.

Key words: Mu Us Sandy Land, mobile dunes, rainfall infiltration, leakage, Hydrus-1D model

CLC Number: