• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Application of surface electrical resistivity surveys and MODFLOW modeling in Smoky Hill River aquifer, Kansas.
【24h】

Application of surface electrical resistivity surveys and MODFLOW modeling in Smoky Hill River aquifer, Kansas.

机译：地表电阻率调查和MODFLOW建模在堪萨斯州黑烟山河含水层中的应用。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Decreasing water resources require the utmost care in managing surface and groundwater supplies. In many areas these two sources are inseparable, and must be evaluated jointly. The Smoky Hill River Wellfield (SHRW) aquifer in semi-arid west-central Kansas is an example. The aquifer, providing half of Hays' water supply, is a typical stream-dominated incised-valley-fill aquifer composed of Late Quaternary silty terrace units hosting younger heterogeneous sandy channel deposits. Resistivity surveys were used to characterize this heterogeneous aquifer's internal and external geometries and hydraulic conductivity simultaneously. These were combined with other data to develop a three-dimensional geometric and facies model of the SHRW, showing that aquifer transmissivity is most heavily influenced by the location of a bedrock channel and downstream increase of conductivity by a factor of 1.5. Integrating this heterogeneity in MODFLOW models indicates the worst historical aquifer performance (minimal streamflow during the severe drought of 1991-1992) could have been moderated by optimized pumping. Consideration of heterogeneity is crucial, since simulations of similar hypothetical cases (no streamflow for 180 days) show the homogenous model underestimates the safe yield by 20%. Models of the heterogeneous aquifer under the worst-case of no streamflow and full water right extraction (2.81e6 m3/year), show optimal pumping would deplete the aquifer (drawdown exceeds 3 m) in 1.2 years. Hays' 2005 extraction rate (45% of water right) would deplete the aquifer in 2.6 years. An upstream reservoir currently releases water only twice annually. These releases would have barely sustained pumping of Hays' full water right, but would not sustain the downstream flows (2.47e6 m3) required. Models demonstrate that drawndowns would be significantly reduced by distributing the same release at more frequent intervals. Three regularly-spaced releases would decrease the maximum drawdown by 20%. The best option to support Hays pumping and the downstream flow requirements is a monthly release totaling 4.82e6 m3/year, yielding maximum SHRW drawdown of 0.9 m. Average natural streamflow since 1980 exceeds this requirement, but droughts (2002-2006) would require drawdown of the reservoir. Should Environmental Flow regulations be imposed, the same models can be utilized to determine the optimum releases that balance groundwater production with streamflow.
机译：减少水资源需要在管理地表水和地下水供应方面格外谨慎。在许多领域，这两个来源是密不可分的，必须共同评估。堪萨斯州中西部半干旱的Smoky Hill River Wellfield（SHRW）含水层就是一个例子。该含水层是Hays供水的一半，是典型的以河流为主的切谷灌水含水层，由晚期第四纪粉质阶地单元组成，容纳较年轻的非均质砂质河床沉积物。电阻率调查用于同时表征该非均质含水层的内部和外部几何形状以及水力传导率。将这些数据与其他数据相结合，建立了SHRW的三维几何和相模型，表明含水层的透射率受基岩通道位置和下游电导率增加1.5的影响最大。在MODFLOW模型中整合这种非均质性表明，最差的历史含水层性能（1991-1992年严重干旱期间的最小水流）可以通过优化抽水来缓解。考虑异质性至关重要，因为对类似假设情况（180天无流量）的模拟表明，同质模型低估了安全产量20％。在无水流和全水权提取（2.81e6立方米/年）的最坏情况下，非均质含水层的模型显示，最佳抽水将在1.2年内耗尽含水层（降水量超过3 m）。海斯2005年的抽水率（45％的水权）将在2.6年内耗尽含水层。上游水库目前每年仅放水两次。这些释放几乎无法持续维持Hays的全部水权，但无法维持所需的下游流量（2.47e6 m3）。模型表明，通过以更频繁的时间间隔分发相同的发行版，可以显着减少缩编。三个规则间隔的释放将使最大跌幅降低20％。支持Hays抽水和下游流量需求的最佳选择是每月排放量总计4.82e6 m3 /年，最大SHRW汲水量为0.9 m。 1980年以来的平均自然流量超过了这一要求，但是干旱（2002-2006年）将需要水库的水位下降。如果要实施“环境流量”法规，则可以使用相同的模型来确定使地下水生产与流量平衡的最佳排放量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号