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71.
阐述了新疆煤炭工业发展中存在的主要问题,分析了新疆煤田地质工作的发展方向及当前工作重点,并对新疆煤炭工业的可持续发展战略提出了政策性建议。 相似文献
72.
城市水资源的合理利用与可持续发展 总被引:7,自引:0,他引:7
自20世纪80年代以来,由于工业的高速发展,中国城市已由180座猛增至666座,城市人口和城市需水量都迅猛增长,造成城市水资源紧缺。城市发展也使污染问题日益严重,直接对水资源造成破坏,影响人体健康。地下水超量开采,引起地面沉降、岩溶塌陷、海水入侵等地质灾害,造成严重经济损失。针对以上问题,本文探讨了城市水资源紧缺的原因及其对生态的影响,提出城市水资源的合理规划、合理利用以及开源节流、保护生态环境与防止地质灾害的相关措施。 相似文献
73.
74.
原始数据图是化探工作中重要的基础性图件,其数字化制图是一项费时费力的工作。利用Microsoft Visual Fox Pro、MAPGIS软件实现分析数据的自动标注,可大大地简化原始数据图制图,提高工作效率。 相似文献
75.
不同电阻率测深方法对旁侧不均匀体的反映 总被引:2,自引:0,他引:2
利用三维有限元数值模拟,重点研究了旁侧三维不均匀体所产生的视电阻率的影响问题,展示了4种常规电阻率测深法在旁侧不均匀体上的异常分布特点;探讨了测深点正下方目标体异常与旁侧不均匀体异常的区别问题,指出旁侧不均匀体的影响是产生电阻率法假异常的主要原因之一. 相似文献
76.
77.
Preliminary Rock-Slope-Susceptibility Assessment Using GIS and the SMR Classification 总被引:1,自引:1,他引:1
This paper aims to examine the impact of large-scale structuraladjustments (like the Greater Dhaka Flood Protection Project, GDFPP) on local living environment.It focuses the importance of environmental factors in flood hazard mitigation, and examines theenvironmental attitudes of the floodplain residents arising from the large-scale structural adjustments.Based on `perceived natural hazard research perspectives', this paper examines: (i) the reasons for persistentfloodplain occupation, and (ii) the importance of environmental factors in the choice, motivations and decision-makingof floodplain residents.This research used data collected from 300 households situated inthe eastern part of Dhaka. The face-to-face household survey data provided individuals' responses to a structuredquestionnaire on hazards and environment. Survey concerned urban floodplains, and looked fordata on housing, household characteristics, and residents' attitudes. Results of interview surveys wereused to: (i) explore the reasons of floodplain occupation, and (ii) residents' attitudes to tolerable levelof flood risk and willingness to accept environmental change resulting from the proposed structural embankments inthe eastern perimeter of Dhaka City, Bangladesh.Findings revealed that floodplain occupation (by theindividuals' decision-making) was a result of overall reaction to the Government's structuraladjustment policies that resulted from institutional, locational and socio-economic factors. The attitude survey results provided residents' perception to hazards and environment to be dependenton the socio-economic factors – but in a complex manner, many factors are interrelated.In addition to support for structural embankments, the study sample displayed a common concernand widespread environmental awareness. In terms of any `trade-off' between thebenefits (resources) from the embankments and costs (hazards) due to the detrimental impact on environment, the residents of Dhaka, despite some concern forsacrificing embankments for environment, tended to show a generalconsensus for embankments. 相似文献
78.
This study presents the evolution of agreements between the governments of Canadaand Québec on flood damage reduction. In Québec, the implementation of a regulation about building in floodplains came about in 1983–1984. Today, this regulation takes the form of a policy called ``Policy of shores, littoral and floodplain protection'. Municipalities must adopt rules that concur with the principles of this policy.The Chaudiére River basin was selected for analysis of urban developmentduring the period following the application of building rules in flood-risk areas.Despite the ban on building in the strong current zone (0–20 year return periodflood zone), many buildings, essentially residential, have been erected in thiszone. These new constructions generally account for a low percentage of thetotal property value in the 0–100 year flooding area, but are legal since theyare connected to a water and sewage network that existed prior to the officialfloodplain regulation.Flood damage along the Chaudiére River will tend to increase for two reasons.Firstly, while respecting the policy mentioned above, sites are still available infloodplains for future development. Secondly, no structural flood protection workshave been erected in view of the fact they are only marginally profitable from anbenefit-cost point of view. 相似文献
79.
80.
数字水印技术与算法实现 总被引:6,自引:0,他引:6
综述了数字水印技术的起源、概念、特点和应用;提出了数字水印处理技术的基本框架;列出了一些主要的基于图像的水印嵌入算法和水印检测算法;并展望了水印处理技术的未来发展趋势;最后给出了一种基于DCT变换的水印嵌入与检测算法。 相似文献