Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 495-504.doi: 10.13278/j.cnki.jjuese.20190197

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Rainfed Recharge Experiment in Typical Plain Area of Chad Lake Basin

Wei Runchu1,2,3, Jiang Yingdi1, Li Mingyuan4, Du Cheng'e4, Qiao Xiaopo1   

  1. 1. School of Hydraulic Engineering, Changsha University of Science&Technology, Changsha 410114, China;
    2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;
    3. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China;
    4. Hunan Non-Ferrous Metals Geology Investigation Bureau Rows 247, Changsha 410129, China
  • Received:2019-09-17 Online:2021-03-26 Published:2021-04-06
  • Supported by:
    Supported by the Youth Fund of National Natural Science Foundation of China (41602264) and the National Natural Science Foundation of Hunan Province (2020JJ5572,2018JJ3543)

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Abstract: Four moisture samples were obtained from the unsaturated zone profiles distributed in a typical plain area of Chad Lake basin to estimate the rainfed recharge based on the chloride (Cl) mass-balance method. The rainfed recharge results of the four sampling points (Y1, Y2, Y3, Y4) are 4.9, 1.5, 7.9, and 26.2 mm/a respectively; That is, the rainfed recharge rate are only 0.72%, 0.22%, 1.17%, and 3.87% correspondingly. Based on the survey work, combined with field investigation and drilling, the reason for the small amount of rainfed recharge is that the infiltration water from the surface is mostly consumed in evapotranspiration in the surface soil or the interface between the clay layer and the aeolian sand layer, and eventually lost to the atmosphere. Undoubtedly, the research area is facing a serious problem of water resources depletion under its single recharge source of Hadejia River, which has been interrupt by local people so greatly that the amount of infiltration to groundwater has been decreasing.

Key words: Chad Lake basin, Nigeria, rainfed recharge, chloride (Cl) mass-balance method

CLC Number: 

  • P641
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