共查询到20条相似文献,搜索用时 718 毫秒
1.
一、问题的提出及无序结点编号的特点网络计划技术,是工程施工进度计划的科学管理方法,国内外各经济部门都在普遍推广应用。在我国水利水电工程施工中,运用网络计划技术来编制施工进度计划的工作刚刚开始,正处在广泛普及、逐步推广阶段。 相似文献
2.
3.
4.
5.
6.
7.
网络计划技术在工程进度控制中的应用 总被引:2,自引:0,他引:2
网络计划技术是表达工程进度计划的有效方法,而且可用来分析资源优化。工程施工不仅要确保工程质量,而且还要控制工程进度。结合湖州船闸扩建工程实例,对网络计划技术在工程进度控制及人员安排进行探讨。 相似文献
8.
一、材料供应计划的编制施工单位在施工过程中,为了使材料供应与需求相适应,需要编制材料供应计划。材料供应计划编制:技术部门根据施工计划及施工预算,按年、季、月提供工程项目、工程量、投资计划,以及单项 相似文献
9.
网络计划技术自20世纪60年代传入中国后,在生产中得到了应用,它符合工程施工的要求,特别适用于施工项目的组织与管理。但在实际应用管理中,基本停留在计划的编制上,对于计划执行中的监督与控制以及跟踪调整方面比较落后。本文从实际出发,对提高网络计划技术在施工管理中的应用水平进行了探讨。 相似文献
10.
过去在水利工程的施工中,编制施工进度计划横道图是施工中应用最广、历时最长的进度计划表现形式,它虽有许多优点,但仍有许多不足之处。诸如用横道图表达的进度计划,其方法简单,表现形式效果直观,但难于完整确切地反映各个工作项目之间互相依存和制约的关系,且不易用数学模型来处理。而网络计划技术可以确切地表明各个工作项目之间的逻辑关系,找出工程中的关键项目和关键线路,并可随工程的进展情况对计划进行优化,因此,网络计划技术在目前国内外的各类工程得到了广泛的应用和推广。 相似文献
11.
The loss of stored water from surface water reservoirs through evaporation is inevitable and can be significant in arid and semi-arid climates. One way of compensating for this inevitable loss is to explicitly include the evaporation process in the reservoir planning analysis, thus ensuring that the resulting capacity estimate will be capable of meeting both the intended consumptive demands and the evaporative losses. However, because evaporation measurements are often unavailable and because there are few reservoir planning techniques that can explicitly accommodate evaporation consideration, this solution is often not applied. The result is that there is currently little guidance regarding the allowance for evaporation losses during reservoir planning in such regions. This study has used data from the Urmia region in Iran to develop a rule for evaporation correction during reservoir planning. The way to use the rule is explained and suggestions about how the study can be extended are offered. 相似文献
12.
13.
14.
Irrigation Planning using Genetic Algorithms 总被引:10,自引:2,他引:8
The present study deals with the application of Genetic Algorithms(GA) for irrigation planning. The GA technique is used to evolve efficient cropping pattern for maximizing benefits for an irrigation project in India. Constraints include continuity equation, land and water requirements, crop diversification and restrictions on storage. Penalty function approach is used to convert constrained problem into an unconstrained one. For fixing GA parameters the model is run for various values of population, generations, cross over and mutation probabilities. It is found that the appropriate parameters for number of generations, population size, crossover probability, and mutation probability are 200, 50, 0.6 and 0.01 respectively for the present study. Results obtained by GA are compared with Linear Programming solution and found to be reasonably close. GA is found to be an effective optimization tool for irrigation planning and the results obtained can be utilized for efficient planning of any irrigation system. 相似文献
15.
水资源综合利用与管理规划初步研究 总被引:5,自引:0,他引:5
通过对水资源可持续利用规划进行的宏观、中观、微观三个层次的研究提出了管理规划的模型.利用该模型,可通过对环境经济的评价促进我国社会经济可持续发展目标的实现.本研究从加强水资源管理,重点要从水资源产权管理、水资源开发利用规划以及水资源合理配置几方面着手,提出应建立健全水资源管理的法律、政策和协调机制,加大水价改革力度,提高水价对促进水资源合理利用的经济杠杆作用,促进水资源的可持续利用. 相似文献
16.
Simultaneous consideration of initial construction cost and failure risk in practical design of critical hydraulic structures
is a long-standing problem in water resources planning and management. Despite extensive efforts to effectively tackle this
problem during recent decades, the traditional rather inefficient technique of return period approach still enjoys being the
dominant technique in real-world projects. Accordingly, this article aims at developing an innovative evolutionary-computation-based
multi-objective model as a remedy to shortcomings of existing common methods. This simulation-optimization framework generates
a series of uniformly distributed trade-off solutions which represent the compromise between competing objectives of construction
cost and failure risk. Hydrologic and hydraulic uncertainties along with flood routing process are considered in the optimization
process to provide a more complete picture of the problem. This approach is demonstrated and discussed for flood diversion
system of Bakhtiari Dam in Iran and the Pareto optimal fronts are found for different combinations of uncertainties. The presented
multi-objective approach can effectively enlarge the decision maker’s scope to more efficiently determine the optimum design
of the system. 相似文献
17.
塔里木灌区位于塔里木河上游,其引水量直接影响到塔河的综合治理。为缓和这一矛盾,本文采用大系统分解协调技术与动态规划相结合的方法对该灌区水库群系统水资源优化配置问题进行了分析和研究,构建了该灌区两层二级结构的水库优化调度系统的数学模型。应用该模型对该灌区水库群进行了实例计算分析,为灌区生产计划和水库调度提供了理论依据。 相似文献
18.
移民安置规划包括生产安置规划与生活安置规划,文章首次对其涉及的有关人口问题进行了系统、科学的分类与平衡计算。研究表明:设计水平年规划农业人口可划分为有地人口和规划生产安置人口;规划生产安置人口可划分为规划淹地淹房人口和规划淹地不淹房人口;规划搬迁(生活)安置人口等于规划淹房人口加上随迁人口及影响人口。 相似文献
19.
Water bodies are impacted by watershed loads in terms of nutrients and xenobiotics. This impact impairs the designated uses of the water body. Often preventive actions and end-of-pipe treatments do not reach the acceptable load to ensure the water quality standard in the water body. Wetlands are suitable tools for improving the self-purification capacity of a water system and can be used as a tool to reduce pollutant loads in a river network.This paper presents a methodology for the Siting and Sizing of created or restored wetlands at the watershed level, based on Geographical Information Systems (GIS) technique and estimations of wetland required area. The final outputs of the methodology are a Land Score System for Siting and a first rough estimation for the Sizing. The combination of these two elements is expected to be useful as a planning tool for watershed management and wetland planning.In order to assess the reliability of the procedure two very different case-studies are considered. 相似文献