Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 4

年份

2015 1

2010 1

2007 1

关键词

养殖模式 1

半滑舌鳎 1

循环水养殖 1

环境可持续性 1

能值 1

展开︾

检索范围：

排序：展示方式：

EMERGY analysis for sustainability evaluation of the Baiyangdian wetland ecosystem in China

Weiqing MENG, Cui HAO, Hongyuan LI, Meiting JU,

《环境科学与工程前沿（英文）》 2010年第4卷第2期页码 203-212 doi: 10.1007/s11783-010-0015-6

摘要： This study presents a quantitative and ecological benefit evaluation of the Baiyangdian wetland in China between the years 2000 and 2006. Methods of EMERGY analysis were applied to illustrate the wetland ecosystem, to evaluate the economic and environmental inputs and consequent yields, and to assess the sustainability of the Baiyangdian wetland. The indicators for the integrated ecological and economic system, such as EMERGY yield ratio (EYR) (7.51), EMERGY investment ratio (EIR) (4.52), environmental loading ratio (ELR) (2.92), EMERGY exchange ratio (0.41), and EMERGY sustainable indicator (ESI) (2.57) were calculated, compared, analyzed, and discussed. The non-renewable investment in Baiyangdian was greater than renewable investment, leading to the unsustainable development of the system. High EYR indicated that the Baiyangdian integrated system had created huge profits for its people, while ELR and ESI revealed that human behavior has been a heavy burden on the environment, and countermeasures should be taken by the Chinese government to relieve and resolve these problems. Potential management methods were also proposed in this paper.

关键词： EMERGY analysis sustainability wetland ecosystem indicators

HTML PDF 收藏

Urban constructed wetlands: Assessing ecosystem services and disservices for safe, resilient, and sustainable cities

《工程管理前沿（英文）》页码 582-596 doi: 10.1007/s42524-023-0268-y

摘要： Climate change and rapid urbanization are pressing environmental and social concerns, with approximately 56% of the global population living in urban areas. This number is expected to rise to 68% by 2050, leading to the expansion of cities and encroachment upon natural areas, including wetlands, causing their degradation and fragmentation. To mitigate these challenges, green and blue infrastructures (GBIs), such as constructed wetlands, have been proposed to emulate and replace the functions of natural wetlands. This study evaluates the potential of eight constructed wetlands near Beijing, China, focusing on their ecosystem services (ESs), cost savings related to human health, growing/maintenance expenses, and disservices using an emergy-based assessment procedure. The results indicate that all constructed wetlands effectively purify wastewater, reducing nutrient concentrations (e.g., total nitrogen, total phosphorus, and total suspended solids). Among the studied wetlands, the integrated vertical subsurface flow constructed wetland (CW-4) demonstrates the highest wastewater purification capability (1.63E+14 sej/m²/yr) compared to other types (6.78E+13 and 2.08E+13 sej/m²/yr). Additionally, constructed wetlands contribute to flood mitigation, groundwater recharge, wildlife habitat protection, and carbon sequestration, resembling the functions of natural wetlands. However, the implementation of constructed wetlands in cities is not without challenges, including greenhouse gas emissions, green waste management, mosquito issues, and disturbances in the surrounding urban areas, negatively impacting residents. The ternary phase diagram reveals that all constructed wetlands provide more benefits than costs and impacts. CW-4 shows the highest benefit‒cost ratio, reaching 50%, while free water surface constructed wetland (CW-3) exhibits the lowest benefits (approximately 38%), higher impacts (approximately 25%), and lower costs (approximately 37%) compared to other wetlands. The study advocates the use of an emergy approach as a reliable method to assess the quality of constructed wetlands, providing valuable insights for policymakers in selecting suitable constructed wetlands for effective urban ecological management.

关键词： constructed wetland emergy ecosystem services disservices ternary diagram

HTML PDF 收藏

半滑舌鳎工厂化循环水养殖模式能值评价

王峰,雷霁霖

《中国工程科学》 2015年第17卷第1期页码 4-10

摘要：

为了更好地评价半滑舌鳎（Cynoglossus semilaevis Günther）在工厂化循化水养殖模式下的养殖效果及环境可持续性，运用能值理论及分析方法构建了半滑舌鳎循环水养殖模式能值流程图，并对此养殖模式各能值分布进行分析。结果表明：循环水养殖模式环境能值投入只占比1.08 %，能值产出率（EYR）为2.433，环境负载率（ELR）为0.313 4，能值可持续发展指标（ESI）为7.763，表明此种养殖模式已经将农业生产提升至工业化水平，其经济系统发展程度高，生产效率较高；同时该养殖模式极大地减轻了对环境的压力，其可持续性和环境容纳量均较高。

关键词：半滑舌鳎循环水养殖养殖模式环境可持续性能值

HTML PDF 收藏

Emergy evaluation of polygeneration systems

WANG Lingmei, LI Zheng, NI Weidou

《能源前沿（英文）》 2007年第1卷第2期页码 223-227 doi: 10.1007/s00000-007-0030-x

摘要： To expand the application range of the emergy evaluation method, an emergy evaluation index, which can reflect the particular feature of polygeneration systems, has been elaborated on the basis of energy and emergy conservation, guided by the fundamental principle of emergy analysis. With this index, the cost structure, emission effect and energy saved were all considered on the same level of importance. To exemplify, some power polygeneration systems (methanol-power generation, hydrogen-power generation) are considered using coal as the basic fuel. The results showed that emergy evaluation indices are practical for comprehensively evaluating polygeneration systems and their sustainability, which is influenced by such factors as the joining mode of polygeneration and the technologies used. The sustainability of polygeneration systems, which work on an appropriate ratio of fuel-to-electric power basis, is higher than that of singular production systems.

关键词： fuel-to-electric sustainability importance polygeneration practical