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白洋淀流域地下水更新速率

DOI: 10.11820/dlkxjz.2015.03.013, PP. 381-388

Keywords: 白洋淀流域,华北平原,地下水,更新能力,

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Abstract:

受到水库拦蓄、抽水灌溉等人类活动的影响,白洋淀流域平原区河流断流,非承压含水层逐渐被疏干。下游的白洋淀无法得到河流和地下水的补给,时刻面临干涸。鉴于白洋淀对区域生态环境和气候有重要的影响,多次实施调水补淀工程。然而,白洋淀渗漏严重,调水补淀的效果不理想。为了保护白洋淀,亟需恢复地下水的可持续性,这首先需要查明地下水的更新能力。2009年,对白洋淀流域平原区地下水进行实地调查,并采集采集地表水和地下水水样共36个,分析其氚含量。利用线性插值法、吴秉钧法和连炎清法恢复了该地区降水氚含量的历史数据,结合数学物理模型估算了非承压地下水的更新能力。结果表明,氚含量较高的白洋淀水渗漏使得周边地下水氚含量增高。总体上,沿山区到淀区的方向非承压地下水更新速率逐渐由15.0%/a降低至4.0%/a。山前平原冲洪积扇区域是非承压地下水的主要补给区,平均更新速率达9.8%/a。冲积平原区域非承压地下水的平均更新速率仅为4.4%/a。为此,需要限制在冲积平原区域开采非承压地下水,以逐步恢复其更新速率,使其重新补给白洋淀。地下水的恢复过程可能较慢,但可从根本上解决调水补淀无法解决的干淀问题。

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