School of Economics and Management, Southwest Jiaotong University, Chengdu, China.
Waste Manag. 2012 Mar;32(3):521-31. doi: 10.1016/j.wasman.2011.11.006. Epub 2011 Dec 23.
During the past few decades, construction and demolition (C&D) waste has received increasing attention from construction practitioners and researchers worldwide. A plethora of research regarding C&D waste management has been published in various academic journals. However, it has been determined that existing studies with respect to C&D waste reduction are mainly carried out from a static perspective, without considering the dynamic and interdependent nature of the whole waste reduction system. This might lead to misunderstanding about the actual effect of implementing any waste reduction strategies. Therefore, this research proposes a model that can serve as a decision support tool for projecting C&D waste reduction in line with the waste management situation of a given construction project, and more importantly, as a platform for simulating effects of various management strategies on C&D waste reduction. The research is conducted using system dynamics methodology, which is a systematic approach that deals with the complexity - interrelationships and dynamics - of any social, economic and managerial system. The dynamic model integrates major variables that affect C&D waste reduction. In this paper, seven causal loop diagrams that can deepen understanding about the feedback relationships underlying C&D waste reduction system are firstly presented. Then a stock-flow diagram is formulated by using software for system dynamics modeling. Finally, a case study is used to illustrate the validation and application of the proposed model. Results of the case study not only built confidence in the model so that it can be used for quantitative analysis, but also assessed and compared the effect of three designed policy scenarios on C&D waste reduction. One major contribution of this study is the development of a dynamic model for evaluating C&D waste reduction strategies under various scenarios, so that best management strategies could be identified before being implemented in practice.
在过去几十年中，建筑和拆除（C&D）废物受到了全球建筑从业者和研究人员的越来越多的关注。大量关于 C&D 废物管理的研究已经发表在各种学术期刊上。然而，已经确定，现有的关于减少 C&D 废物的研究主要是从静态的角度进行的，没有考虑整个废物减少系统的动态和相互依存的性质。这可能导致对实施任何废物减少策略的实际效果的误解。因此，本研究提出了一个模型，可以作为一个决策支持工具，根据给定建设项目的废物管理情况预测 C&D 废物的减少量，更重要的是，作为模拟各种管理策略对 C&D 废物减少的影响的平台。该研究采用系统动力学方法进行，系统动力学方法是一种系统方法，用于处理任何社会、经济和管理系统的复杂性-相互关系和动态性。动态模型集成了影响 C&D 废物减少的主要变量。在本文中，首先提出了七个因果回路图，可以加深对 C&D 废物减少系统反馈关系的理解。然后使用系统动力学建模软件制定了一个存量流量图。最后，通过案例研究来说明所提出模型的验证和应用。案例研究的结果不仅对模型建立了信心，使其能够用于定量分析，而且还评估和比较了三种设计政策方案对 C&D 废物减少的影响。本研究的一个主要贡献是开发了一个用于在各种方案下评估 C&D 废物减少策略的动态模型，以便在实际实施之前确定最佳的管理策略。
