Study On The Optimized Utilization Of Water Resources In Coastal Cities Short Of Water

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.