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滨海缺水城市水资源优化利用研究
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摘要
沿海地区是我国人口最多、经济最发达的地区,是我国对外开放的前沿和窗口。由于经济的持续发展和人民生活水平的提高,对水资源的需求量越来越大,对水质的要求越来越高,而水资源的严重污染,使本来紧张的水资源的供需矛盾更加尖锐化。因此,对滨海城市的水资源优化利用的研究具有重要的理论意义和实用价值。
     本文以青岛市为研究对象,将青岛市辖区划分为9个计算单元,在分析各个计算单元水资源利用现状的基础上,探讨了引起水资源紧缺的主要因素,进行了水资源需求预测、合理配置和投入产出评价方面的研究,主要得到以下成果:
     1、青岛市当地水资源开发潜力有限,城市用水挤占农业用水的水量不断加大,枯水年农业用水难以保障;另一方面随着全市用水量的增长,污水排放量不断增加,加大了水环境污染风险。由于青岛市各计算单元水资源分割管理,难以做到对多水源的统一规划、科学调度、合理配置和有效保护,影响了资源的互济互配,降低了水的利用率。要提高青岛市辖区的水资源利用效率和满足各用户的水资源需求,必须加大计算单元之间的水资源合理配置,加大回用中水、雨水和淡化海水的利用力度。
     2、通过对需水预测方法及影响因素的分析,修正了青岛市人口增长预测的Logistic增长模型、工业发展预测的GM(1,1)模型;根据农业发展现状及未来发展趋势,确定了农业发展规划指标;根据用水定额法,分别预测生活、工业和农业用水量;同时分别预测了河道内和河道外生态需水量。在推荐方案(即最优化方案)条件下,青岛市2010年生活、工业、农业(P=75%)和生态需水量分别为20060.62×10~4m~3、4717094.00×10~4m~3、211490.30×10~4m~3和9755.00×10~4m~3;2020年生活、工业、农业(P=75%)和生态需水量分别为28809.24×10~4m~3、34765714.00×10~4m~3、205272.80×10~4m~3和12430.00×10~4m~3;2030年生活、工业、农业(P=75%)和生态需水量分别为38290.56×10~4m~3、428466623.00×10~4m~3、199181.20×10~4m~3、15175.00×10~4m~3。将生活、工业、农业和生态进行分类预测和模型系数修正,提高了预测结果的精度。分析结果显示,工业用水量增长迅速,是青岛市中长期发展中的用水大户;生活用水和生态用水呈平稳增长趋势;而农业用水将会随着工业化进程呈现递减趋势。
     3、分析了青岛市水资源优化利用的途径,通过对地表水、地下水、中水、雨水、客水和淡化海水等供水水源及生活、工业、农业和生态等用户用水优先级的确定,利用水资源系统分析的方法,修正了青岛市水资源优化利用数学模型及相关参数。研究得知,青岛市各计算单元的用水经济效益在不断增大:2010年,平度的用水经济效益最大,崂山最小;2020年和2030年,市内四区的用水效益均最大,效益最小的计算单元分别是崂山和莱西。社会效益主要是指各计算单元的缺水程度,通过提高污水回用系数、增加雨水收集措施、增强海水利用力度,并结合客水调剂,青岛市各计算单元在3个水平年的水资源供给都能满足社会经济发展对水资源的需求。环境效益在不断增大:2010年,平度的用水环境效益最大,崂山最小;2020年和2030年,市内四区的用水环境效益均最大,环境效益最小的计算单元分别是崂山和黄岛。
     4、从水资源-生态环境-社会经济复合系统的角度,建立了包含生活、工业、农业和生态4个部门的青岛市水资源利用投入产出模型,分析青岛市的用水效率和用水效益,弥补了青岛市在该方面的欠缺。综合分析用水效率和用水效益,2010年的高用水部门为市内四区的工业部门,崂山的工业和农业部门,城阳的工业和农业部门,黄岛的工业部门,胶州、胶南、即墨、平度和莱西的农业部门;潜在高用水部门为生态用水部门。2020年的高用水部门为市内四区、崂山、城阳、黄岛的工业部门,即墨的工业和农业部门,胶州、胶南、平度和莱西的农业部门;潜在高用水部门为生态用水部门。2030年的高用水部门为市内四区、崂山、城阳、黄岛的工业部门,胶州、胶南、即墨和莱西的工业和农业部门,平度的农业部门;潜在高用水部门为生态用水部门。
Coastal area, with the most population and most developed economy,is the front and center to the outside world. Because of the sustainabledevelopment of economy and the remarkable improvement of people's livingstandard,the quantity demanded of water resource is much bigger and thewater quality demanded is much higher. But severe water pollution makesthe contradiction between supply and demand of water resource much sharper.So there is great theoretical significance and utility value to study theoptimum usage of water resource in coastal cities.
     In this thesis, Qingdao city as the object of study is divided intonine units. Through the analysis of each unit in current water resourceusing, the major factors causing water shortage are discussed, the studyof water demand forecast, rational allocation and input-output evaluationare conducted, and the main research achievements are as follows.
     1. On one hand, the potential of water resource development in Qingdaocity is still limited and the municipal water crowded out much more thanagricultural water, which makes it’s hard to safeguard the water foragricultural use in dry season. On the other hand, with the growing waterconsumption and waste water discharge, the risk of water environmentpollution is also increasing. Because of the water resource segmentingmanagement for each unit in Qingdao city, it’s hard to unified planning,scientific controlling, rational disposing and effective protecting the multi-source water and consequently influencing the water resourceallocation and lowers the water utilizing rate. To improve the waterresource utilization rate and satisfy the customer’s requirement inQingdao city, it must increase the rational allocation of water resourcein each unit and also increasing the utilization rate of recycled water,rainwater and desalinated seawater.
     2. Over the analysis of forecasting methods and influencing factorsfor water requirement, the Logistic model for forecasting populationgrowth in Qingdao and GM (1,1) model for forecasting industrialdevelopment are revised. According to the current development and furtherdevelopment tendency, the agricultural development planning target isconfirmed. On the basis of water consuming quota, the water demanded forlife, industry and agriculture is forecasted. Meanwhile, the ecologicalwater requirement is forecasted within and without the river way. Underthe recommended proposal which is also the optimized one, the waterrequirement of Qingdao city in2010is200606.20thousand m~3for life,47170940.00thousand m~3for industry,2114903.00thousand m~3foragriculture (P=75%) and97550.00thousand m~3for ecology. In2020it is288092.40thousand m~3for life,347657140.00thousand m~3for industry,2052728.00thousand m~3for agriculture (P=75%) and124300.00thousand m~3for ecology, and in2030it is382905.60thousand m~3,4284666230.00thousand m~3,1991812.00thousand m~3and151750.00thousand m~3correspondingly. Through the classification and prediction of life,industry, agriculture and ecology, and amendment of model coefficients,the accuracy of prediction is increased. The analysis shows that industrywhich is the major water consumption client in Qingdao’s mid-term andlong-term development programs grows fast in water consumption. The waterconsumption for life and ecology grows steadily and to the contrary, thewater consumption for agriculture will declined.
     3. The ways of water resource optimum usage in Qingdao city areanalysed in this thesis. Through the confirmation of water supply suchas surface water, underground water, recycled water, rainwater, foreignwater and desalinated seawater, and the priority level of waterconsumption clients including life, industry, agriculture and ecology,the Qingdao city water resource optimum usage mathematical model andrelevant parameter are revised. The research reveals that the economicbenefit of water consumption in each unit is growing fast. In2010, theeconomic benefit of Pingdu county-level city is the largest and Laoshandistrict is the smallest. In2020and2030, it’s predicted that theeconomic benefit of four districts in urban area which includes Shinandistrict, Shibei district, Sifang district and Licang district will bethe largest and to the contrary, Laoshan district and Laixi county-levelcity will be the smallest. Social benefit refers to water shortage in eachunit. By improving waste water recycling ratio, increasing the methodsof rainwater collecting, enhancing seawater desalinating, and combiningforeign water allocation, the water supply will satisfy the social andeconomic development in each unit in three target year. Environmentalbenefit is also increasing. In2010, the environmental benefit of waterconsumption in Pingdu county-level city is the largest, Laoshan districtis the smallest. In2020and2030, four districts in urban area will bethe largest, Laoshan district and Huangdao district will be the smallest.
     4. From the angle of multiplexed system containing water resource,ecological environment and social economy, Qingdao water resourceconsumption input-output model which includes life, industry,agriculture and economy is established, the water consumption efficiencyand benefit are analysed, and the gap in this field of Qingdao city ismade up. In2010, the industrial sectors of four districts in urban area,the industrial and agricultural sectors of Laoshan district and Chengyang district, the industrial sectors of Huangdao district, the agriculturalsectors of Jiaozhou county-level city, Jiaonan county-level city, Jimocounty-level city, Pingdu county-level city and Laixi county-level cityare the largest water consumption clients, and the ecological sectors arepotential large water consumption clients. In2020, the largest waterconsumption clients are the industrial sectors of four districts in urbanarea, Laoshan district, Chengyang district and Huangdao district, theindustrial and agricultural sectors of Jimo county-level city, theagricultural sectors of Jiaozhou county-level city, Jiaonan county-levelcity, Pingdu and Laixi county-level city, and the ecological sectors arepotential large water consumption clients. In2030, the industrialsectors of four districts in urban area, Laoshan district, Chengyangdistrict, Huangdao district, the industrial and agricultural sectors ofJiaozhou county-level city, Jiaonan county-level city, Jimo county-levelcity and Laixi county-level city, agricultural sectors of Pingducounty-level city are the largest water consumption clients, and stillthe ecological sectors are potential large water consumption clients.
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