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现代地质 ›› 2022, Vol. 36 ›› Issue (02): 591-601.DOI: 10.19657/j.geoscience.1000-8527.2022.008

• 水资源与环境地质 • 上一篇    下一篇

利用趋势化随机参数场的地下水流数值模拟优化方法

南天1,2(), 曹文庚1,2, 王卓然3(), 张娟娟4, 张栋5   

  1. 1. 中国地质科学院水文地质环境地质研究所, 河北 石家庄 050061
    2. 京津冀平原地下水与地面沉降国家野外科学观测研究站, 河北 石家庄 050061
    3. 水利部信息中心,北京 100053
    4. 河北省地矿局第六地质大队,河北 石家庄 050058
    5. 中国地质大学(北京) 水资源与环境学院,北京 100083
  • 收稿日期:2021-10-20 修回日期:2022-02-20 出版日期:2022-04-10 发布日期:2022-06-01
  • 作者简介:南天,男,助理研究员,1986年出生,地下水科学与工程专业,主要从事水文地质和地下水数值模拟研究。Email:419416433@qq.com
  • 基金资助:
    国家自然科学基金面上项目(41972262);河北自然科学基金优秀青年科学基金项目(D2020504032)

Optimized Groundwater Numerical Simulation Model with Trending Parameter Field

NAN Tian1,2(), CAO Wengeng1,2, WANG Zhuoran3(), ZHANG Juanjuan4, ZHANG Dong5   

  1. 1. Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China
    2. National Observation and Research Station on Groundwater and Land Subsidence in Beijing-Tianjin-Hebei Plain, Shijiazhuang, Hebei 050061, China
    3. Water Information Center, Ministry of Water Resources, Beijing 100053, China
    4. 6th Geological Team, Hebei Bureau of Geology and Mineral Resources, Shijiazhuang, Hebei 050085, China
    5. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
  • Received:2021-10-20 Revised:2022-02-20 Online:2022-04-10 Published:2022-06-01

摘要:

水文地质参数场的刻画是建立地下水流数值模拟模型的关键问题和难点问题。通常来讲,参数场合理性程度越高,模型拟合精度越高。本次研究将随机方法和参数空间分布表达进行结合,提出了趋势化随机参数场的构建方法。以渗透系数为研究对象,首先利用MCMC采样和样本数据特征确定水文地质参数的基本数据结构,进而根据样本空间分布特征对其进行趋势化处理,最终形成趋势化的渗透系数场。通过算例分析,利用趋势化处理后的渗透系数场能够大幅提高模拟精度,相比传统赋均值方法其误差可降至原来的1/3。在北京大兴跌隆起地区进行的实例应用说明,趋势化渗透系数场对提升岩性粒径较大(中砂以上)地区模拟精度效果显著,案例中粗砂区域渗透系数经趋势化处理后平均拟合误差由2.76 m下降至0.64 m;而对岩性以细砂及以下粒径为主的区域模拟精度提升并不明显。总体来说,该方法可为地下水流数值模型的优化提供借鉴,提升模型拟合精度,从而更加合理地刻画地下水流系统。

关键词: 渗透系数, 地下水数值模拟, 模型优化, 随机方法, 趋势化

Abstract:

Hydrogeological parameter field is the key and challenging topic in groundwater numerical simulation. Generally, high-precision simulation results are derived from more reasonable parameter field. In this study, a trending stochastic parameter field construction method was proposed with stochastic and spatial distribution simulation technology. We took the hydraulic conductivity field as an example, and used the MCMC sampling method and sample feature analysis to extract data structure first. After that, the stochastic parameter field was reshaped with the trend features. For the case study, we compared the traditional parameter field, which filled blocks with the regional mean value. The trending parameter field has significantly improved the model accuracy with the mean error reduced by about 2 times. Practically, the mean simulation error comes down from 2.76 to 0.64 m in the coarse-grained area. In contrast, there is little effect in the low permeability area. To conclude, our method can provide reference for optimizing groundwater numerical simulation, improve the model fitting accuracy, and better describe the groundwater flow system.

Key words: hydraulic conductivity, groundwater numerical simulation, model optimization, stochastic method, trend

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