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1.
Abstract An interval-fuzzy two-stage quadratic programming (IFTSQP) method is developed for water resources management under uncertainty. The methodincorporates techniques of interval-parameter programming, two-stage stochastic programming, and fuzzy quadratic programming within a general optimization framework to tackle multiple uncertainties presented as intervals, fuzzy sets and probability distributions. In the model formulation, multiple control variables are adopted to handle independent uncertainties in the model's right-hand sides; fuzzy quadratic terms are used in the objective function to minimize the variation in satisfaction degrees among the constraints. Moreover, the method can support the analysis of policy scenarios that are associated with economic penalties when the promised targets are violated. The developed method is then applied to a case study of water resources management planning. The results indicate that reasonable solutions have been obtained. They can help provide bases for identifying desired water-allocation plans with a maximized system benefit and a minimized constraint-violation risk. 相似文献
2.
针对目前水闸工程管理考核评价中存在的问题,研究了水闸工程管理的模糊评价方法。在确定评价指标、权重分配的基础上,构建了2层模糊评价模型,利用专家定性评价结果计算各项2级指标的隶属度,采用模糊运算,依据最大隶属度原则确定评价结果。实例计算表明,水闸工程管理模糊评价得出的结果合理。因此,构建的水闸工程管理模糊评价模型是正确的。 相似文献
3.
In this article, linear programming and fuzzy optimization models are developed for planning and management of available land-water-crop system of Mahanadi-Kathajodi delta in eastern India. The models are used to optimize the economic return, production and labour utilization, and to search the related cropping patterns and intensities with specified land, water, fertilizer and labour availability, and water use pattern constraints. Due to extreme backwardness of the study area, it has been decided to keep all the three objectives of the linear programming models at the same priority level to obtain the compromised solution in a fuzzy environment that incorporates the imprecision in fuzzy goals and fuzzy constraints. These non-structural models facilitate the conjunctive use of available surface water and groundwater resources. A comparative evaluation along with the benefit-cost ratios of the existing and proposed farming systems is also presented. 相似文献
4.
Drawing on empirical evidence from a case study conducted in the upper Mekong catchment, this article assesses the performance of the Erhai Lake Basin Management Commission, an organization mandated to control pollution and integrate the diverse interests of those individuals and communities living and working near Erhai Lake. Clear local rules, strong enforcement, practical protocols, clear responsibilities and extensive mobilization have been crucial to the success of this small river basin organization. However, the insufficient involvement of numerous important stakeholders in decision-making processes has decreased the commission’s capacity to address water issues. 相似文献
5.
An Inexact Chance-constrained Quadratic Programming Model for Stream Water Quality Management 总被引:3,自引:2,他引:1
Water quality management is complicated with a variety of uncertainties and nonlinearities. This leads to difficulties in
formulating and solving the resulting inexact nonlinear optimization problems. In this study, an inexact chance-constrained
quadratic programming (ICCQP) model was developed for stream water quality management. A multi-segment stream water quality
(MSWQ) simulation model was provided for establishing the relationship between environmental responses and pollution-control
actions. The relationship was described by transformation matrices and vectors that could be used directly in a multi-point-source
waste reduction (MWR) optimization model as water-quality constraints. The interval quadratic polynomials were employed to
reflect the nonlinearities and uncertainties associated with wastewater treatment costs. Uncertainties associated with the
water-quality parameters were projected into the transformation matrices and vectors through Monte Carlo simulation. Uncertainties
derived from water quality standards were characterized as random variables with normal probability distributions. The proposed
ICCQP model was applied to a water quality management problem in the Changsha section of the Xiangjiang River in China. The
results demonstrated that the proposed optimization model could effectively communicate uncertainties into the optimization
process, and generate inexact solutions containing a spectrum of wastewater treatment options. Decision alternatives could
then be obtained by adjusting different combinations of the decision variables within their solution intervals. Solutions
from the ICCQP model could be used to analyze tradeoffs between the wastewater treatment cost and system-failure risk due
to inherent uncertainties. The results are valuable for supporting decision makers in seeking cost-effective water management
strategies. 相似文献
6.
This report analyses the relevant factors that influence the restoration of macrophytes in hypertrophic water bodies, including hydrology, water quality and sediment. Wuli Lake in China is used as a case study for the goal of achieving limno‐ecosystem protection and sustainable development. This report also identifies and discusses some potential macrophyte restoration measures, including pollution control at the source and reducing external pollutant loads to the lake, and environmental restoration measures to improve lake water quality and sediment conditions. The potential for the sustainable management of the lake ecosystem also was explored from the perspective of new restoration systems and mechanisms. 相似文献
7.
Teodoro Carlón Allende Manuel E. Mendoza Erna Martha López Granados Luis Miguel Morales Manilla 《Water Resources Management》2009,23(12):2587-2603
Efficient natural resources management, including continental water at watershed level, requires understanding the arrangement
of landscape attributes in a region. The geographical analysis of landscape attributes is a useful approach to delineate relatively
homogeneous watersheds or regions. This research was carried out in order to evaluate the effect of land cover through time
on regionalisation modelling in the poorly-gauged Cuitzeo Lake Watershed, and to develop models to create two hydrogeographical
regionalisations for the years 1975 and 2000. The inputs required by the regionalisation methodology were integrated in a
GIS and validated before carrying out statistical regionalisation procedures (cluster analysis and PCA). GIS operations were
done in Arc View 3.2 and statistical analyses in PC-ORD. Median Euclidean distances with mean distance linkage methods were
used. A 75% of similarity was chosen as the threshold to generate regions. Importance rankings of regions were obtained using
multicriteria evaluation methods. Based on the analysis, 38 of the 52 subwatersheds belonging to the Cuitzeo Lake Watershed
were clustered; eight groups were defined in 1975 and nine in 2000. According to PCA, the strongest positive variables are
associated to morphometric, geologic, land cover and soil attributes. Fourteen subwatersheds were never clustered. Four subwatersheds
changed of cluster between 1975 and 2000. This change is explained because of rainfed agricultural parcel abandonment, and
subsequent shrubland growth. This means that the hydrogeographical regionalisation is sensitive to land cover change processes.
The methodological approach applied in this research is a low-cost and fast alternative for evaluating the impact of land
cover and land use change on hydrogeographical regionalisation; in consequence, data and information generated during the
analysis were made available to local authorities so that they can improve both water resources planning and their informational
baseline for decision making and for development of environmental policies in the Cuitzeo Lake Watershed. 相似文献
8.
基于联系数的流域水安全评价模型 总被引:18,自引:1,他引:17
建立了流域水安全评价指标体系和评价标准,用基于加速遗传算法的模糊层次分析法筛选指标、确定各指标和子系统的权重,用集对分析方法建立了基于联系数的流域水安全评价模型(CN-AM).CN-AM可从指标、子系统和样本3个层次定量地分析流域水安全的复杂状态,既可测度流域水安全整体状态的高低程度,又可识别影响流域水安全状态的重要指标和重要子系统.CN-AM在巢湖流域中的应用结果表明,基于联系数的均分原则评判方法与属性数学的置信度准则评判方法具有一致性和互补性,联合应用可保障CN-AM评价结果的可靠性.巢湖流域水安全系统处于临界安全状态,应提升流域的经济和科技发展水平、推广节水技术、加快城市化进程和控制人口增长,以提高该流域水安全的保障程度. 相似文献
9.
Optimal Land-Use Management for Surface Source Water Protection Under Uncertainty: A Case Study of Songhuaba Watershed (Southwestern China) 总被引:4,自引:1,他引:4
The water supply to Chinese cities is increasingly degrading from pollution due to watershed activities. Consequently, water
source protection requires urgent action using optimal land-use management efforts. An inexact linear programming model for
optimal land-use management of surface water source area was developed. The model was proposed to balance the economic benefits
of land-use development and water source protection. The maximum net economic benefit (NEB) was chosen as the objective of
land-use management. The total environmental capacity (TEC) of rivers and the minimum water supply (MWS) were considered key
constraints. Other constraints included forest coverage, government requirements concerning the proportions of various land-use
types, soil loss, slope lands, and technical constraints. A case study was conducted for the Songhuaba Watershed, a reservoir
supplying water to Kunming City, the third largest city in southwestern China. A 15-year (2006 to 2020) optimal model for
land-use management was developed to better protect this water source and to gain maximum benefits from development. Ten constraints
were involved in the optimal model, and results indicated that NEB ranged between 893 and 1,459 million US$. The proposed
model will allow local authorities to better understand and address complex land-use systems and to develop optimal land-use
management strategies for balancing source water protection and local economic development. 相似文献
10.
11.
An Interactive Fuzzy Satisfying Approach for Sustainable Water Management in the Yellow River Delta,China 总被引:3,自引:2,他引:1
This paper proposes using an interactive fuzzy satisfying method to solve multi-objective optimization problems in integrated
water management of the Yellow River Delta, China. The approach involves economic, social and ecological objectives represented
by net returns, water deficiency and ecological water requirements, respectively. It considers the decision-maker’s preferences
in terms of fuzzy satisfying of each objective and holistic satisfying of all objectives based on Euclid distance. The method
avoids the subjectivity of having decision-makers assigning weights to the multiple objectives to some degree. The method
is applied to the Yellow River Delta, China. Results indicate that considerably more water should be allocated to ecological
uses of water in the Yellow River than currently occurs. An interactive fuzzy satisfying approach for the multi-objective
optimization problems has significant potential in the field of integrated water management. 相似文献
12.
Integrated water resources management (IWRM) is becoming increasingly accepted as the most logical and effective means of managing aquatic ecosystems for their sustainable use. Despite efforts to provide practical examples of the application of IWRM, we still lack knowledge on how to best consider and integrate the potentially large quantity of data and information, both scientific and socioeconomic, which must be considered in pursuit of the goal of sustainable water resources. The unique features of (i) an integrating nature; (ii) long water retention time, and (iii) complex response dynamics make the management of lakes and reservoirs particularly difficult to achieve. Although the World Lake Vision has provided substantial management guidance to address some of the complex issues facing lake and reservoir management, additional work directed to analysing the interactions and linkages between the scientific/technical and the socioeconomic components of the sustainability ‘equation’ is needed. This report examines the use of mathematical models as a synthesizing tool in developing and applying management strategies for lakes and reservoirs. The different types of available models, and the criteria that can be used to select the ‘best’ model for a given situation, also are discussed, as is the important role of environmental indicators in the process. A case study focusing on the restoration of Lake Fure in Denmark provides an illustrative example of the application of the approach discussed in this report. 相似文献
13.
14.
An unusually high incidence of spinal deformity in migratory trout from the Brule River, Wisconsin, was investigated to determine its probable cause and extent. Incidence in rainbow trout (Salmo gairdneri) and brown trout (Salmo trutta) was determined by external examination and x-ray. The total incidence of deformity in x-rayed and externally examined lake-run rainbow trout was 50 and 26 percent, respectively. No vertebral anomalies were found by x-ray in 75 Brule River juvenile rainbow trout which had not yet emigrated to Lake Superior, nor in 25 lake-run rainbow trout from the French River, Minnesota. Examination of 25 lake-run brown trout from the Brule River showed external deformity (8 percent) and internal vertebral abnormalities (16 percent). The absence of spinal deformity in juvenile rainbow trout from the Brule River and in lake-run trout from the French River suggest that the electric lamprey control weir on the Brule was affecting fish which migrated downstream. The lower incidence of injury in brown trout reflects the difference in the time of their migration which was not coincident with weir operation. It is apparent that the electric lamprey weir has had a greater total impact on recruitment of trout to Lake Superior than previously thought. 相似文献
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16.
Jos Timmermans 《Water Resources Management》2009,23(6):1211-1236
Recent developments in the policy sciences emphasize the social environment in which decisions are made. The ‘network metaphor’
is often used to describe the key role of interactions between interdependent actors involved in decision making. These interactions
take place in a policy arena drawn up by actors with an interest in and control over decisions on the issues addressed. Interdependencies,
caused by the need for actors to increase their means of realizing objectives, are the driving force behind these interactions.
Dependency relations are of special interest to water management and river basin management because of the fundamental asymmetrical
interdependencies that exist in river basins between upstream and downstream stakeholders. Coleman’s linear system of action
models decision making process involving dependencies between multiple stakeholders as exchange of control over issues, while
interactions are required to negotiate exchanges of control. We developed an interactive method for actor analysis based on
Coleman’s linear system of action and applied it to the national rural water management policy domain in The Netherlands.
The method is firmly rooted in mathematical sociology and defies the criticism that methods for actor and stakeholder analysis
do not specify a theoretical basis explaining the causal relations between the variables analyzed and policy change. With
the application to the rural water management policy arena we intended to increase our insight into the practical applicability
of this analytic method in an interactive workshop, the acceptability of the approach for the participating actors, its contribution
to the process of decision making and our understanding of the rural water management policy arena in The Netherlands. We
found that the Association of Water Authorities, the Ministry of Public Works and the Ministry of Agriculture are the most
powerful actor in the policy domain, while governance and cost and benefits of rural water management are the most salient
issues. Progress in policy development for rural water management is probably most promising for the issues governance, costs
and benefits, safety and rural living conditions through improved interaction between the Association of Water Authorities,
the Ministry of Agriculture and the Rural Credit Bank. Besides these analytic results the interactive approach implemented
increased the participants understanding of their dependency on other actors in the rural water management policy domain and
supported them in developing a sound perspective on their dependency position. We concluded that the method developed is acceptable
to real-world policy decision makers, can successfully be applied in an interactive setting, potentially contributes to the
process of decision making by increasing the participants understanding of their dependency position, has the potential to
delivers valuable advice for future decision-making and increases our understanding of policy development for rural water
management in general. 相似文献