华北典型地下水大深埋区 潜水层垂向补给特征及其给水度

针对华北平原地下水大埋深区面积大, 而其地下水垂向补给特征及含水层给水度认识不足的问题, 以河北栾 城试验站附近某研究区为典型区, 基于大田试验的水循环模拟, 量化了地下水补给及潜水层给水度大小, 并探讨了 地下水垂向补给特点等关键问题。研究表明: 研究区在两个丰水年2012 年及 2013 年地下水潜在补给量约为2361 6 mm 和 2231 5 mm, 当年实际补给量约为 1441 1 mm 和 1291 8 mm, 日补给量在 01 37~ 01 40 mm 及 01 33~ 01 38 mm 之 间; 经过厚包气带的迟滞和调节作用, 地下水补给过程较为平稳, 年际年内差异较小; 研究区当前地下水埋深条件下 潜水含水层给水度约为 01 03。 The area o f reg ions w ith a deep g roundw ater table is expanding in No rth China Plain ( NCP) . The characteristics of gr oundwat er recharg e and the value of specif ic y ield hav e not been w ell studied in NCP. Therefo re, an ag ricultura l area near Lu2 ancheng Ex perimental Stat ion, H ebei Pr ov ince, was taken to study the v ertical r echarg e and the specific yield using distributed water cy cle modeling based on a field ex periment. Mor eo ver, t he gr oundwat er r echar ge char acteristics w ere also explo red. T he results show ed that in 2012 and 2013, the potential rechar ge was 2361 6 mm and 2231 5 mm, while the gr oundw ater recharg e w as 1441 1 mm and 1291 8 mm, respect ively, in the study area. And the daily recha rge rate ranges betw een 01 370 mm/ d and 01 404 mm/ d and 01 327 and 01 382 mm/ d in 2012 and 2013 r espectiv ely. This scenario indicated that the gr oundw ater recharg e w as rel2 atively stable and the inter2annual and inter2diurnal differences wer e small due to the r egulat ion and buffering of the deep vado se zo ne. Besides, the specific y ield of the unconfined aquifer w as abo ut 01 03. 国家重点研发计划项目( 2016YFC0401407) ;国家杰出青年科学基金( 51625904) ; 中国水科院创新团队项目( WR0145B622017)