吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (2): 495-504.doi: 10.13278/j.cnki.jjuese.20190197

• 地质工程与环境工程 • 上一篇    下一篇

乍得湖盆地典型区域降雨入渗补给地下水试验

危润初1,2,3, 姜颖迪1, 李铭远4, 杜成额4, 乔小坡1   

  1. 1. 长沙理工大学水利工程学院, 长沙 410114;
    2. 水沙科学与水灾害防治湖南省重点实验室, 长沙 410114;
    3. 洞庭湖水环境治理与生态修复湖南省重点实验室, 长沙 410114;
    4. 湖南省有色地质勘查局二四七队, 长沙 410129
  • 收稿日期:2019-09-17 出版日期:2021-03-26 发布日期:2021-04-06
  • 作者简介:危润初(1984-),男,讲师,博士,主要从事地下水水文演化等领域的研究工作,E-mail:weirunchu@163.com
  • 基金资助:
    国家自然科学基金青年项目(41602264);湖南省自然科学基金项目(2020JJ5572,2018JJ3543)

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)

摘要: 针对尼日利亚北部乍得湖盆地降雨入渗补给地下水的问题,选择典型区域开展土壤剖面取样工作,采用氯离子平衡法计算各剖面降雨入渗补给量,并结合野外调查、钻探等工作研究影响降雨入渗补给的主要因素。结果表明:4个取样点(Y1、Y2、Y3、Y4)土壤剖面年平均降雨入渗补给量分别为4.9、1.5、7.9、26.2 mm/a,平均值为10.1 mm/a,年平均降雨入渗补给率仅为0.72%、0.22%、1.17%、3.87%,平均值为1.49%;研究区降雨入渗补给量很少,降雨对地下水资源的补给有限,地下水的主要补给来源为Hadejia河;研究区蒸散发量大,植物根系发达、吸水能力强,地表入渗水分多在表层土壤中或泥质层与风积砂层交界面上消耗于蒸发蒸腾,最终散失到大气中。在人类活动严重改变Hadejia河水文情势的背景下,研究区这种独特的地下水补给特征导致地下水位快速下降,使得区内正面临较严重的地下水资源枯竭问题。

关键词: 乍得湖盆地, 尼日利亚, 降雨入渗补给, 氯离子平衡法

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

中图分类号: 

  • P641
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