基于INPGA的地下水污染治理多目标优化管理模型:Ⅱ——实例应用          下载免费PDF全文

吴剑锋  彭伟  钱家忠  吴吉春  郑春苗 《地质论评》2011,57(3):437-443

简单算例研究表明改进的小生境Pareto遗传算法(INPGA)用于求解地下水系统的多目标优化管理模型时,求解过程简单,计算速度快,而且得到的Pareto解集跨度更为合理.本文以美国麻省军事保护区(Massachusetts Military Reservation,MMR)为实例,通过建立研究区复杂地下水污染治理的多目...  相似文献   

多年冻土区矿山开采研究现状及展望   总被引：4，自引：3，他引：1  

何维维  盛煜  周飞  张波 《冰川冻土》2011,33(2):388-396

多年冻土区蕴藏着丰富的矿产资源,矿业开发已成为多年冻土区经济发展的主要产业之一.但是,在其开采过程将不可避免地受到冻土的影响,也造成多年冻土区生态环境恶化的影响.在西部大开发的进程中,能源需求量逐渐增加,而多年冻土区矿山露天开采量逐渐减少,开展多年冻土区矿山地下开采相关的研究工作显得尤为迫切.在分析和总结前人研究成果的...  相似文献   

地震后陇南特大地质灾害成因分析   总被引：1，自引：1，他引：0  

冯军  张蓉  冯瑞娟 《地质灾害与环境保护》2011,22(1):5-9

由于2008年"5.12"特大地震对陇南地质环境和气候环境的影响,2008年和2009年两次特大暴雨引发了滑坡和泥石流特大地质灾害.本文从地质环境变化和引发特大暴雨的高空气流,分析了特大地质灾害的成因,提出了地质灾害的应对策略和措施.  相似文献   

云南麻栗坡芭蕉箐铅锌矿成因探讨     

刘晓佳 《云南地质》2011,30(3):305-307,288

矿体似层状、透镜状赋存于中寒武系田蓬组碳酸盐岩岩系中,北东向褶皱的滑脱空间、断裂破碎带为容矿的重要场所。  相似文献   

CSAMT拟二维反演并行计算程序设计     

梁萌 《物探化探计算技术》2011,33(6):673-676,576

可控源音频大地电磁法（CSAMT）拟二维反演并行计算程序,基于多进程与多线程方式实现程序的并行化,并形成相应的算法和程序。采用该并行计算程序,在多处理器多核工作站上进行实测数据的计算测试,结果表明,CSAMT拟二维反演并行计算程序可以有效提高反演效率。  相似文献   

夏季丰水期河流输入对太湖有色可溶性有机物的贡献   总被引：3，自引：0，他引：3       下载免费PDF全文

冯龙庆  刘明亮  张运林  殷燕  时志强  刘笑菡 《水科学进展》2011,22(1):104-111

结合2008年夏季丰水期对太湖上游直湖港、大浦河、长兜港3条河流有色可溶性有机物(CDOM)吸收和三维荧光的测定分析,探讨了夏季丰水期时河流输入对太湖中CDOM的贡献.3条河流中直湖港CDOM浓度最高,大浦河次之,长兜港最低,反映了太湖北部外源河流污染物输入大于西南部.3条河流内CDOM吸收α(355)的均值为(4.7...  相似文献   

Parallel Numerical Analysis on the Rheology of the Martian Ice-Rock Mixture     

景惠敏  张怀  李菡  David A Yuen  石耀霖 《中国地质大学学报(英文版)》2011,(2)

The distribution and amount of ground ice on Mars is an important issue to be addressed for the future exploration of the planet.The occurrence of interstitial ice in Martian frozen ground is indicated by landforms,such as fluidized ejecta craters,softened terrain,and fretted channels.How-ever,experimental data on the rheology of ice-rock mixture under Martian physical conditions are sparse,and the amount of ground ice that is required to produce the viscous deformation observed in Martian ice-related landf...  相似文献   

Numerical simulation of a partially buried pipeline in a permeable seabed subject to combined oscillatory flow and steady current     

Hongwei An  Liang Cheng  Ming Zhao 《Ocean Engineering》2011,38(10):1225-1236

Hydrodynamic forces exerting on a pipeline partially buried in a permeable seabed subjected to combined oscillatory flow and steady current are investigated numerically. Two-dimensional Reynolds-Averaged Navier-Stokes equations with a k−ω turbulent model closure are solved to simulate the flow around the pipeline. The Laplace equation is solved to calculate the pore pressure below the seabed with the simulated seabed hydrodynamic pressure as boundary conditions. The numerical model is validated against the experimental data of a fully exposed pipeline resting on a plane boundary under various flow conditions. Then the flow with different embedment depths, steady current ratios and KC numbers is simulated. The amplitude of seepage velocity is much smaller than the amplitude of free stream velocity as expected. The normalized Morison inertia, drag and lift coefficients based on the corresponding force coefficients of a fully exposed pipeline are investigated. The normalized Morison force coefficients reduce almost linearly with the increase of embedment depth and that the KC only has minor effect on the normalized Morison coefficients. It is also found that the permeable seabed condition causes a slight increase on the inline force and has a little effect on the lift force, compared with corresponding conditions in an impermeable bed.  相似文献   

A possible generation mechanism of the strong current over the northwestern shelf of the South China Sea     

WANG Gang  QIAO Fangli  DAI Dejun  HOU Yijun 《海洋学报(英文版)》2011,30(3):27-32

Continuous observation in late April 2005 on the northwestern shelf of the South China Sea reveals vigorous strong currents, the maximum velocity of which exceeds 3.8 m/s. The strong currents occurred around spring tide period, when the internal tide waves were also expected to be vigorous. Analysis shows that the major peaks of the current power spectrum are in low frequency band. Using a numerical method applied to the actual ocean stratification, we find that the amplitude profiles of the strong current are similar to that of the currents induced by some low-mode internal waves (at diurnal or semi-diurnal frequency). It indicates that the temporal and spatial features of strong currents were possibly induced by low frequency internal waves.  相似文献   

Analysis of thermohaline and current distribution characteristics of Zhejiang and Fujian waters in summer   总被引：3，自引：1，他引：2  

DU Panjun  ZHANG Hui  XIAO Wenjun  KANG Xing  GUAN Qinle 《海洋学报(英文版)》2011,30(5):71-83

This paper analyzed the distribution of thermohaline and circulation characteristics of Zhejiang and Fujian waters, based on the cross-sectional thermohaline data and on current data (up to 30 d duration) at fixed-point moorings, collected in the summer of 2006. We also performed low-pass filtering and spectrum analysis on the mooring submersible buoy data. Based on that analysis, we discussed the characteristics of low frequency currents and time-variations in these waters. The main conclusions are as follows. (1) There is a low salinity pinnate area near the Hangzhou Bay in summer, and outside the low salinity area, an obvious salinity front is present from surface to bottom near 123°E. There is also a temperature front below the surface at a corresponding position. (2) Bottom water of the Taiwan Warm Current comes from the subsurface of Kuroshio. (3) The direction of low frequency current at fixed anchor stations is N-NE or S, which mainly depends on the interaction of control currents in this waters. (4) Significant spectral peaks at all mooring stations are typically semidiurnal and diurnal tides. Semidiurnal tidal waves are the main ones in these waters, and have more energy closer to the shore. (5) Significant energy spectral peaks of middle period (3 to 8 d) of currents are responses to weather frequency. (6) Significant energy spectral peaks of long periods at the surface or bottom are probably responses to seasonal wind or bottom friction, while, the long period peaks of other depths can reflect cyclical changes of interactions between currents. We conclude that the pulsation period of the Taiwan Warm Current in these waters is 10-17 d.  相似文献