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上海市水资源利用模式可持续性定量研究
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摘要
虽然上海坐落于黄浦江、长江入海口,由于水质差及其他原因,仍然存在严重的可用清洁水短缺问题。本文首先考虑相关理论,尝试把可持续性相关研究应用到上海水资源利用模式中。其次,分析水污染水平、可用的清洁水量及水需求的影响因素,根据改革开放以来可用清洁水量及水需求的演变趋势,探讨上海市水资源利用模式的可持续性。
     为了描述上海水资源利用模式的可持续性,本文介绍了可用清洁水量指标CWA、相对可用清洁水量指标RCWA,测量可用的清洁水量与水需求的比例。根据这些指标考察上海水资源状况的重要因素是水质量问题。本文用回归分析方法评估各因素对CWA及水需求的作用及其相对重要性,并分析RCWA演变趋势,作为上海水资源利用模式可持续性的讨论基础。
     经济迅速发展导致可用清洁水资源量及清洁水需求的显著增长。RCWA目前为0.65,意味着清洁水需求等于可用清洁水量的150%,对上海水资源利用模式的可持续性有很大威胁。水需求、水污染增长的缓解因素中,城市产业结构变化对水污染强度及用水强度有显著作用,而水污染强度、用水强度自1978年分别下降40%及60%。这也对水需求及可用水资源量有很大的作用。污染强度变化及用水强度变化把RCWA分别提高26个百分点及37个百分点。技术进步使RCWA上升49个百分点,而政府公布的相应数字为48个百分点。
     自改革开放以来RCWA的演变趋势,可以看到1996年达到低潮,此后又呈上升趋势。本文根据RCWA指标提出水资源利用模式的可持续性标准。由于只有15年时间的为据,而RCWA还未满足城市水需求,所以现在还不能说上海水资源利用模式是可持续的。如果未来能保持目前的曲线,上海水资源利用模式有可能实现可持续性,但需要起码一代人的时间才实现,而由于其变化的波动和不确定性,现在还无法有效地预测。
Shanghai, situated on the Huangpu River and on the Yangtze River Estuary, still suffers acutely from a lack of available clean water, mainly due to poor water quality. This research paper aims first to build a thorough theoretical foundation for the application of previous sustainability research to Shanghai's water resources usage model. We then analyse the factors affecting water pollution levels and the availability of, and demand for, clean water in the city. The trends associated with clean water availability and demand since the reform and opening up provide evidence as to the sustainability of Shanghai's water usage model.
     In order to understand the sustainability of Shanghai's water usage model, our paper introduces indicators of clean water availability, CWA, and relative clean water availability, RCWA, which measures the ratio of clean water availability to demand. These indicators take water quality into account, which is essential for any analysis of Shanghai's water resources. We apply regression analysis to determine the influence and relative importance of each factor in our model to CWA, water demand, and then subsequently to RCWA. This provides us with our basis for discussing the sustainability of Shanghai's water usage model.
     Rapid economic development has led to a considerable decrease in the available clean water and a corresponding increase in demand for clean water. As a result, RCWA currently stands at around 65, indicating a demand at around 150% of availability, throwing into serious doubt the sustainability of Shanghai's water usage model. Of the factors alleviating the increase in water demand and water pollution caused by rapid economic development, we find that the change in composition of the city's industry during the industrial transition has exerted a significant effect both on its pollution intensity and on its water intensity, which have decreased by 40% and 60% respectively over the period from 1978. This, in turn, has had a significant effect on both water demand and clean water availability. Changing pollution intensity has increased RWCA by 26 percentage points whilst the corresponding figure for water intensity change is 37 percentage points. In addition, technological progress has led to an increase in RCWA of 49 percentage points and government measures have led to an increase of 48 percentage points.
     Given the historical trends in RCWA since the reform and opening up, we see that Shanghai reached a low point in 1996 but that conditions are improving. Our paper introduces sustainability criteria for water usage models based on the RCWA indicator. Since the current improvement trend has only lasted for 15 years so far, and since the available clean water is still insufficient to satisfy demand, it is not possible to conclude that Shanghai's water usage model is sustainable. However, if current trends continue, it is possible that Shanghai's water usage model can achieve sustainability, though this will take at least a generation and is not assured, as trends in pollution intensity and water intensity will not necessarily continue at the same rate.
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