海岛淡水透镜体演变规律的室内模拟实验     

甄黎  周从直  束龙仓  曹英杰  耿海涛 《吉林大学学报(地球科学版)》2008,38(1):81-85

淡水透镜体作为海岛主要的甚至是唯一的淡水资源,对其在天然和开采条件下的演变规律研究是海岛淡水资源利用和管理的首要任务。采用自制的室内物理模型,对海岛淡水透镜体的演变过程进行了模拟实验。模拟了降雨补给条件下淡水透镜体的形成过程;在无补给条件下,开采淡水时倒锥的变化过程。结果表明：当开采量达到3.73×10^-5m³/s时,倒锥进入抽水井,淡水透镜体被击穿。  相似文献   

Optimal pumping locations of skimming wells     

《水文科学杂志》2013,58(2):352-361

Abstract

A real-life problem involving pumping of groundwater from a series of existing wells along a river flood plain underlain with geologically saline water is examined within a conceptual framework. Unplanned pumping results in upconing of saline water. Therefore, it is necessary to determine optimal locations of fixed capacity pumping wells in space and time from a set of pre-selected candidate wells that minimize total salinity concentration in space and time. The nonlinear, non-convex, combinatorial problem involving zero—one decision variables is solved in a simulation—optimization (S/O) framework. Optimization is accomplished by using simulated annealing (SA)—a search algorithm. The computational burden is primarily managed by replacing the numerical model with a surrogate simulator—artificial neural network (ANN). The computational burden is further reduced through intuitive algorithmic guidance. The model results suggest that the skimming wells must be operated from optimal locations such that they are staggered in space and time to obtain least saline water.  相似文献   

海水入侵研究现状与展望   总被引：13，自引：0，他引：13  

李国敏  陈崇希 《地学前缘》1996,3(2):161-168

文中讨论了海水入侵的研究进展：海岸带海水入侵界面或过渡带的模拟，海岛地下淡水透镜体的动力学研究，井孔在界面或过渡带上部抽水所引起的升锥问题以及岸边地下水位动态研究及海平面变化对海水入侵的影响。海水入侵研究经历了从理想假定到合理概化，从室内实验模型、理想模型到数值模型这一过程。数值方法已成为模拟和求解海水入侵问题的最有力工具，海水入侵的过渡带模型成为主要的研究方向。分析了研究中存在的困难，展望了海水入侵研究的未来趋势：边界条件确定，水文地质参数选取，含水层结构估计，海水入侵输运与化学作用的耦合以及海水入侵预报。  相似文献