摘要
深层基岩地下(热)水水化学污染问题日趋严重,急需定量而仿真地模拟和预报天然状态和各种人为工程经济活动下地下(热)水流动及溶质(或污染物)的运移。在充分认识地质、水文地质条件的基础上,建立了考虑温压变化和越流条件的昆明市地热田深层基岩地下热水系统中水流和溶质运移的准三维非稳定流数学模型。模型用于开采条件下地热田地下热水水位及F-、Cl-浓度的模拟,模拟结果具有较高的仿真性,拟合误差一般小于2%～5%,表明模型合理、可靠。应用所建模型预测了开采条件下昆明市地热田II块段地下热水流场和溶质浓度动态的变化趋势,并提出了控制地下热水环境进一步恶化的措施。
With the increasing seriousness of groundwater(or geothermal groundwater) pollution,the need for modeling and predicting groundwater flow and solute mass(or contaminants) transport in groundwater system of the basement rock aquifers under the condition of nature and human activity has imposed extraordinary demands on the field of groundwater modeling, which has been brought to the great notice of experts at home and abroad. In accordance with the geological and hydrogeologic conditions of Kunming city geothermal field,which is a large low temperature geothermal groundwater field, a quasithree dimensional numerical model with temperature and pressure variation in the geothermal leaky aquifers system is presented based on the authors' recent years' research in this paper. It is coupled with the wellknown groundwater flow model and a heat transfer model and a mass(contaminant) transport model. The above model is applied to describe the geothermal groundwater hydrauliclevel and concentration of the simulated mass factor(contaminant) versus time of Z2dn aquifer in II block under the situation of exploitation.The simulated results agree well with the observed facts.The average error of geothermal water hydraulic-level is less than 1.5 meter,and the average error of chlorin ion and vitriol ion are both less than 3 to 5 percent. It is revealed that the present model is reliable and practical. Finally, the changes of the geothermal water seepage field and the mass(contaminant) concentration is evaluated and predicted quantitatively under the current scale of exploitation. The appropriate corresponding countermeasures to sustainable exploitation and utilization have been proposed.
出处
《地球科学进展》
CAS
CSCD
2003年第6期899-905,共7页
Advances in Earth Science
基金
云南省自然科学基金项目"昆明盆地地下热水开发的环境效应"(编号:1999D006Q)
"昆明热田地下热水系统的耦合动力学模拟"(编号:2003D009Q)资助.
关键词
地下热水
越流含水系统
溶质(污染质)运移
数值模型
昆明市地热田
Geothermal groundwater
Leaky aquifer system
Mass(contaminant) transport
Numerical simulation model
Kunming city geothermal field.
