发布时间 : 星期三 文章2016美赛E题参考答案更新完毕开始阅读9f36d621ba0d4a7303763aaa
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durable years, with a lot of maintenance costs, the reservoir engineering is more expensive than diversion project. Then we can get the judgment matrix of the economics C3to the criterion layer as follows:
??1??3C3??1??3?1??213115143512?2??4?1??2??1??
The biggest characteristic root of matrixC3:
C?max?4.0511
3The characteristics of the vector is:
WC3?? 0.2323,0.5462,0.0838,0.1377?T
Then we take consistency check.
Random consistency index R.I.?0.9
C.I.??max?nn?1?0.0170
C.R.?C.I?0.0191?0.10R.I.
The test passes.
4. In the aspect of environmental benefits, Environmental effect of sewage treatment and seawater desalination is greater than that of water and water diversion project. Due to the industrial pollution in theNorth China, the development of sewage treatment industry will be of great help for improving the region's environment. Meanwhile, water storage project provides a good guarantee to agricultural production and resource development. It can also drive the cultivation, the development of emerging industries, such as travel, and can improve the water cycle, reduce the water loss, improve the local ecological environment, so the water engineering produces higher environmental benefits than the water diversion project. So we can get the judgment matrix of the environmental benefits C4to the criterion layer as follows:
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??1??3C4??1??3?1??213115143512?2??4?1??2??1??
The biggest characteristic root of matrixC4:
C?max?4.1170
4 The characteristics of the vector is:
WC4?? 0.1175,0.0553,0.5650,0.2622?T
Then we take the consistency check.
Random consistency indexR.I.?0.9,
C.I.??max?nn?1?0.0390
C.R.?The test passes.
C.I?0.0438?0.10R.I.
8.1.4Total sorts of hierarchy and consistency check
Integrated scheme is calculated relatively to the total sorts of decisions general expression:
Table 9:Integrated scheme
C timeliness sustainability economy 0.1175 0.5462 0.2323 0.1377 0.0838 0.2622 0.0553 0.1175 0.2622 0.5650 0.0553 0.2323 0.5462 0.0838 0.1377 P Environmental benefits The total weight 0.5650 0.1175 0.2262 0.0553 0.5650 0.1579 0.1196 0.4088 0.3137 Reservoir engineeringP1 Water diversion projectP2 Sewage treatmentP3 desalinationP4
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W?? 0.1579,0.1196,0.4088,0.3137?
TCI??ciCIi?0.0354
i?14Hereinto,CR?CI?0.0393?0.10passes the consistency check. RI8.1.5 Interpretation of result
It can be concluded that in North China the weight of each processing scheme is shown in:
Figure 11:Optimization scheme of water supply in North China
The results obtained from the analytic hierarchy process can be seen that wastewater treatment and seawater desalination is main measures of adjusting water supply structure in North China .It has a great environment influence and offset the huge potential of the gap, at the same time, as long as the management system is reasonable, sewage treatment and sea water desalination plant are able to achieve sustainable development, and in the early stage about large-scale economic investment,the later will bring a huge cost advantages. So, if the North China wants to get rid of the plight of water shortage and developing healthily, must be in the future, Changing itself to rely heavily on water storage projects and Water supply allocation of water diversion project of the south to North Water Transfer Project, at the same time, set up a serious of water systems such as wastewater treatment and seawater desalination technology.
The water storage project in North China could be used for the agricultural production and resource development provide a good guarantee. At the same time,it
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led to the development of tourism the breeding and other emerging industries. It also provide a large number of energy shortage of electricity and water. Meanwhile, we take into account that the reservoir is poor and high cost characteristics, through analysis the fact that water storage projects accounted for 15.8% of the total water supply is the best. This will not only solve part of the water problem also use the reservoir water, power generation regulating ecology, developing agriculture and so on.
Through water diversion project in North China, it could make use of the existing conditions to reduce the cost of obtaining water resources. Due to the input of the past few years, China's south to North Water Diversion Project has been fully started, so water diversion project is undoubtedly the current the cheapest and effective way to get water. In the short term, less cost can be used to obtain more water resources
But we take into account the question, which influents sustainable development in the North China region and water resources reserves in the south area, thought water diversion project for a long time, economic efficiency is not as well as the sea water desalination and wastewater treatment, We believe that the North China region in the future can be gradually reduced on the dependence of water project. Accounted for 11.96% of the appropriate.
As a large industrial area in North China, the problem of urban pollution is serious, through the establishment of sewage treatment plant, It can provide a lot of water to solve the problem of pollution in the city, at the same time, sewage treatment can also improve the quality of urban environment,residents to further reduce the cost of Medicine, At present, the environmental pollution is more serious in North China. So for the North China, wastewater treatment has great potential. Also it has the very big necessity.
After analysis, the North China should be invested in sewage treatment in the vast majority of the energy. Development of sewage treatment is both measures of environmental protection and economic benefits.
Due to technical constraints in North China, Seawater desalination initial investment is relatively high, however, in the process of sea water desalination, we can get a lot of fresh water resources. There are a lot of salt and other chemicals, and be able to form a circular economy industry. At the same time, it can also reduce the potential environmental pollution and improve economic performance. It is important that the North China region is facing the sea. The cost of access to the sea is low, however, taking into account the cost of the short term. Seawater can provide 31.4% of the water gap in North China in the future. This can meet the future water supply and the protection of the environment, and can be guaranteed to be in the range of acceptable
8.2Optimization of waterconsumptionallocation
Water allocation optimization of water resources, which should be combined with the water supply configuration optimization and from the water consumption of