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广州市城市边缘区土地利用优化配置(英文) 总被引：1，自引：1，他引：0
In response to the strong drive for social and economic development, local governments have implemented urban master plans, providing measures and timeframes to address the continuous demand for land and to alleviate urban problems. In this paper, a multi-objective model was constructed to discuss the problem, including economic benefits and ecological effectiveness, in terms of land use optimization. A genetic algorithm was then adopted to solve the model, and a performance evaluation and sensitivity analysis were conducted using Pareto optimality. Results showed that a set of tradeoffs could be acquired by the allocation of land use. In addition, the Pareto solutions proved the model to be efficient; for example, a limit of 13,500 ha of urban area conformed to plan recommendations. The reduction in crop land, orchard land, grassland, and unused land provided further efficiencies. These results implied that further potential regional land resources remain and that the urban master plan is able to support sustainable local development in the years to come, as well as verified that it is feasible to use land use allocation multi-objective modeling and genetic algorithms. 相似文献
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乌江构皮滩水利枢纽下坝址岩溶发育特征及工程地质条件 总被引：5，自引：0，他引：5
乌江构皮滩水利枢纽坝址区以灰岩为主,岩溶为坝址主要工程地质问题。本文根据对多年勘测资料的分析,论证了坝址区影响岩溶的因素、岩溶空间展布规模及岩溶发育深度,并由此建立了坝址区各自独立的岩溶洞穴网络─—岩溶系统。结合下坝址Ⅰ线布置方案,详尽地介绍了大坝基础及拱座下游岩体中岩溶发育情况,并就由其带来的基础承载力、变形及抗滑稳定问题,作了初步的分析。 相似文献
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在区域上广泛分布并具有一致方位的节理,可用来恢复区域构造应力场的状态及其演化过程。通过对乌江构皮滩水电站坝区地层中所发育节理系统的方位、几何样式、充填情况、序列关系等特征的详细观察和分析,发现坝区的节理系统具有三组优势方位：走向NNE。倾向NWW（第一组）、走向NWW。倾向NNE（第二组）、走向NWW,倾向SSW（第三组）;而且第一组节理形成最早,第三组节理形成其次,第二组节理形成最晚。根据节理系统与应力的各种关系,结合研究区的区域构造演化,认为NNE向节理主要为燕山运动期的产物,并且在后期构造运动中有多次活动,而NWW向节理主要为喜山运动期和新构造运动期的产物。通过对节理系统中方解石脉e双晶的统计,求得燕山早期坝区古应力为111～142MPa。燕山中期坝区古应力为50-83MPa,燕山晚期或喜山早期坝区古应力为52～77MPa。节理系统的发育特征反映了燕山运动以来区域构造应力场主要以近NNW-E-W向的挤压为主,而古应力的变化则反映了燕山运动以来构造活动逐渐减弱。 相似文献
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