Study On The Selection Of The Risk Elimination And Reinforcement Plan For Sluices

Sluice,as a kind of low-head hydraulic structure built on the rivers and channels for flow control and water level control,is producing main effect in many fields,such as flood control,waterlogging,etc.Analyzed from the relevant statistics from the Ministry of Water Resources,up to the end of 2009,various degree of illness and danger are observed in about 5,000 medium and large size sluices.In order to restore the engineering benefits,it is of great significance to select the suitable plan for risk elimination and reinforcement on those sluices.Based on the research on Multiple Attribute Decision Making(MADM),also in the light of the principle of serviceability,integrity,representativeness and maneuverability,the relevant factors affecting the performance of risk elimination and reinforcement are specially analyzed in the thesis,as well as foundation of the scientific evaluation index system and effectively workable decision theory for the optimal selection of the risk elimination and reinforcement plan.Due to the historical legacy,lots of sluices were listed as the heritage protection units,and the factor of cultural relics preservation is regarded as an important element for decision-making during establishment of evaluation index system.By comparing the advantages and disadvantages of subjective weighting,objective weighting and Combinatorial analysis,the entropy method is applied when the real indices are weighted in the evaluation system,then the risk elimination and reinforcement plan will be comprehensively evaluated by Technique for Order Preference by Similarity to an Ideal Solution(TOPSIS)for the final optimal selection.Meanwhile,the Analytic Hierarchy Process(AHP)is also discussed in the thesis,and the Eigenvectors of the Judgment Matrix were figured out through AHP for the priority ranking of the various objectives.The final optimal selection shall be made after the contrast between the outputs from the Entropy-TOPSIS combined method and AHP method.On the condition of safety operation of the project,following our legally required provision of “Do not change the original status of relics” and the Minimum Intervention Principle in the “Venice Charter”,also implementing “Keep the original status of ancient buildings,the original structure,raw materials,the original process”on the restoration of heritage buildings,the decision-making process for the risk elimination and reinforcement plan for one of the sluices was taken as a case in the thesis,and the Entropy-TOPSIS combined method and AHP method were applied respectively in the process of comparison and selection out of three alternative plans.Through an application example,the serviceability of Entropy-TOPSIS combined method for optimal selection of the risk elimination and reinforcement plan was further verified,which shall provide a idea or method for dealing with the contradictions between engineering requirement and heritage protection in the future.