Water Resources Allocation Of Dalian City Based On Assessment Of The Water Resources Renewal

The issue of water shortage limits the rapid development of a city, brings on the deteriora tion of environment system, and even causes water affair conflicts. However, one of the most efficient ways of handling such issue is to increase the renewable volume of water resources, and to optimally allocate the water resources to users. The dissertation takes Dalian City as study domain, studies the construction of integrated indexes system and approach for assessing water renewal; the measures of improving water renewal involving the feasibility of performing social water cycle measures, crop pattern optimization and water resources allocation; and the assessment of action of the carried measures. The main contents and conclusions are summarized as follows.(1) Integrated indexes system and approaches for assessing water renewal. From the viewpoint of the characteristic of water renewal of Dalian City and the thought of "natural-social" binary water cycle, the integrated indexes system is developed, and subjective as well as objective correlate analysis approaches are used to get rid of the correlative indexes.Then the fuzzy pattern recognition model is selected to ascertain the state of water renewal based on the fuzziness and interval numbers existing in the integrated indexes system, and the combined approach is used to determine weights. Finally the indexes system and assessment model are applied to Dalian City to gain its state of water renewal, natural water renewal and social water renewal between the year 1998 and 2007. Moreover, the projection persuit model is also used to assess water renewal, and its result is is consistent with that of fuzzy pattern recognition model; this further tests the efficiency of the two models.(2) Feasibility analysis of the social water cycle measures. The chapter takes Dalian City as example, and then analyzes the achievements, existing problems and potential in water-saving, the actuality and potential in use of reclaimed grey water, seawater as well as desalted seawater, and the precondition and potential of the trans-basin water works. Furthermore, the comparison between Dalian city and other cities which gain achievements in water-saving, use of non-traditional water type and trans-basin water works; this expects to support practical proofs to the following research.(3) Crop pattern optimization under fuzzy environment and assessment to crop pattern schemes. The water-saving irrigation mode and corresponding crop pattern optimization are crucial to the improvement of social water renewal. The multi-objective crop pattern optimization model is developed, with three objectives of maximizing economic, social as well as environmental benefit. And the interactive fuzzy multi-objective optimization approach is used to gain the satisfactory crop pattern schemes according to decision makers' perferences. Then an assessment model by combining fuzzy set theory and entropy theory is proposed to gain the optimal crop pattern scheme. The optimization and assessment models are both used to Dalian City for obtain its crop pattern scheme in the planning years 2020 and 2030. Finally the model proposed by Chen is also used, and its result is is consistent with that of my model; this further tests the efficiency of the two models.(4) Water resources allocation under fuzzy environment. Considering the fuzziness existing in parameters prediction, and the fuzzy dependence in allocating water to different users, fuzzy numbers are used to represent the predicted values, and a fuzzy multi-objective water allocation model is proposed based on the methodology of fuzzy dependent multi-objective programming, and then the hybrid algorithm of combining fuzzy simulation technology as well as genetic algorithm is used to obtain the satisfactory water allocation schemes. Finally the model and solution algorithm are applied to Dalian City to obtain the satisfactory water resources allocation schemes in the planning years 2020 and 2030. By using the model, the "economic" type,"safe" type and "trade-off' type schemes can be directly gained via setting different cutting level. Moreover, predicted values of trapezoidal fuzzy number and normal fuzzy number representation are also used, and the results are consistent with each other; this illustrates that the membership function of fuzzy number has little influence on the optimal solution.(5) Assessment of social water cycle measures implement. The chapter takes Dalian as example, and analyzes the effect of those series of social water cycle measures. The corresponding indexes values are obtained from the water resources allocation schemes of Chapter 5, and the indexes system and assessment approach are used to assess the state of social water renewal of the planning years 2020 and 2030. The results imply that the social water cycle measures are efficient and effective for improving the state of social water renewal; and sensitivity analysis results illustrate that trans-basin works, grey water reclamation, water-saving of urban living, direct use of seawater, seawater desalt, water-saving of agriculture, water-saving of industy are the factors influencing social renewal in sequence.