| 山东烟台夹河中、下游地区海水入侵三维水质数值模拟研究 |
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| 引用本文： | 成建梅,陈崇希,吉孟瑞,孙桂明.山东烟台夹河中、下游地区海水入侵三维水质数值模拟研究[J].地学前缘,2001,8(1):179-184. |
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| 作者姓名： | 成建梅 陈崇希 吉孟瑞 孙桂明 |
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| 作者单位： | 1. 中国地质大学 环境地质研究所,
2. 山东省第三地质队 地质工程勘察院, |
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| 基金项目： | 国家自然科学基金资助项目!( 4 9872 0 81) |
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| 摘 要： | 建立了三维变密度对流弥散水质数学模型来研究山东省烟台夹河中、下游地区咸淡水界面的运移规律。以四面体为基本离散单元 ,推导出三维海水入侵变密度水质模型求解的数值方法 ,其中水流方程求解时运用了迦辽金有限单元法。溶质运移方程求解时运用了欧拉拉格朗日混合方法 ,将对流项与弥散项分离 ,用传统迦辽金有限元方法求解弥散项 ;采用自适应MOC MMOC法求解对流项 ,以消除人工过量和数值弥散。根据地下水的潮汐效应观测信息 ,确定了含水系统的海底延伸边界 ;利用该地区地下水水头及水质长观资料识别了模型的水文地质参数 ,探讨了夹河地区海水入侵的原因 :认为夹河下游地区滨海地带地下水过量开采是造成烟台地区海水入侵的主要原因。此外 ,海水随潮定期地倒灌进入夹河 ,通过局部岩性天窗侵入淡水含水层加剧了沿夹河河床两侧地下水的咸化。同时还预测了几种情况下地下水的水质演化趋势 ,为防止和减轻夹河地区海水入侵提供合理、科学的依据。
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| 关 键 词： | 海水入侵 三维变密度模型 欧拉拉格朗日混合法 模型预测 |
| 文章编号： | 1005-2321(2001)01-0179-06 |
| 修稿时间： | 2001年2月26日 |
THREE-DIMENSIONAL NUMERICAL STUDY FOR SALT WATER INTRUSION IN MULTI-LAYERED COASTAL AQUIFERS IN THE JAHE RIVER BASIN,SHANDONG PROVINCE,CHINA |
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| CHENG Jian mei ,CHEN Chong xi ,JI Meng rui ,SUN Gui ming.THREE-DIMENSIONAL NUMERICAL STUDY FOR SALT WATER INTRUSION IN MULTI-LAYERED COASTAL AQUIFERS IN THE JAHE RIVER BASIN,SHANDONG PROVINCE,CHINA[J].Earth Science Frontiers,2001,8(1):179-184. |
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| Authors: | CHENG Jian mei CHEN Chong xi JI Meng rui SUN Gui ming |
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| Institution: | CHENG Jian mei 1,CHEN Chong xi 1,JI Meng rui 2,SUN Gui ming 2 |
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| Abstract: | A three dimensional variable density flow and transport model has been developed to study the salt water intrusion in the Jahe River Basin, Shandong Province, China Based on tetrahedral element, the authors derived the numerical approximation procedure of 3D density dependent saltwater intrusion model The density dependent flow equation is solved numerically by Galerkin FEM formation The solute transport equation is solved by means of a coupled Eulerian Lagrangian method in which advection part is separated to dispersion part and calculated by a hybrid method of characteristics so as to improve the precision of concentration solution of advective part In using of density dependent tidal effect model, the equivalent boundary toward sea in confined aquifer is determined according to tidal fluctuation information The aquifer parameters in the Jahe River Basin are estimated by converging long term observation data of hydraulic head and chloride concentration Through numerical analysis and prediction, it is concluded that the main reason for saltwater intrusion is excessive groundwater exploitation and improper arrangement of pump wells in the lower reaches of the Jahe River Basin Besides, seawater comes into river because of tidal effect Therefore, groundwater near river is contaminated by saltwater in tongue form By predicting the tendency of water saline quality under several conditions, two measures are suggested to prevent salt water intrusion |
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| Keywords: | salt water intrusion three dimensional variable density model adaptive Eulerian Lagrangian method model prediction |
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