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At present, the research on the flood discharge atomization of high dam mainly focuses on the partition and prediction of the affected area, while the comprehensive assessment of the hazard degree and the environmental impact degree of atomization around the dam having little achievement. In this paper, an evaluation model of flood discharge atomization based on fuzzy mathematic -hierarchical analysis is constructed. The coupling relationship between fuzzy mathematic analysis module and hierarchical structure analysis module is established through the evaluation results of hazard degree of atomization. The hazard degree of flood discharge atomization and the degree of engineering safety and local environmental impact are synthetic evaluated in Jingping Hydropower Station. Introduction At present, China has successively designed and constructed a number of large-scale hydropower projects with high dams and super-high dams of nearly 300 meters or over 300 meters. These projects have the common characteristics of "high head, large discharge, narrow valley", and their flood discharge and energy dissipation are one of the key technical problems of the project [1-3] . Relying on a series of physical models, such as Wujiangdu (dam height 165.0m, scale 1:35, 1:60, 1:80, 1:100), Ertan (dam height 240.0m, scale 1:25, 1:35), Jinping I (dam height 305.0m, scale 1:50), Nanjing Hydraulic Research Institute has made a thorough study on the atomization similarity of model test [4-6] . The numerical simulation analysis of flood discharge atomization of Baihetan, Ertan, Lianghekou and Xulong high arch dam hydropower stations was carried out by the Chinese Institute of Water Resources and Hydropower Research, Tianjin University and Changjiang River Scientific Research Institute [7-13] . However, the establishment of comprehensive impact assessment model for engineering safety and local environment of atomization has not been discussed in detail. In this paper, the method of combining fuzzy mathematics with analytic hierarchy process (AHP) model is used to evaluate comprehensively the environment impact of Jingping Hydropower Station. To solve the problem that it is impossible to assess the environmental impact of flood discharge atomization by using the basic data. Assessment Index System for Environmental Impact of Atomization in High Dam Factor Set and Fuzzy Mathematic-Hierarchical Model In order to evaluate the comprehensive impact of atomization on environment of high dam flood discharge, it is necessary to evaluate the atomization degree of the project itself first. The set of factors can be divided into the set of factors for evaluating the hazard degree of atomization and the set of factors for evaluating the environmental impact of atomization. According to the selection criteria of evaluation factor set, the hierarchical structure model of comprehensive evaluation of flood discharge atomization is established. As shown in Figure 1. From top to bottom, there is the target layer, the criterion layer and the scheme layer in the hierarchical structure model. The evaluation target is the environmental impact degree of flood discharge atomization, and the criterion layer is the evaluation factor set of atomization hazard degree. Figure 1. Hierarchical structure model for comprehensive assessment of environmental impact on flood discharge atomization. Evaluation Set Assessment sets are generally divided into five levels: "great harm", "more harmful", "Not much harm", "Less harmful" and "no harm". Assessment Index System for Environmental Impact of Atomization in High Dam Jingping Hydropower Station is a large-scale project with Concrete Double-Curvature Arch Dam with a maximum dam height of 305.0m; flood discharge and energy dissipation are dominated by dam body. The designed discharge of the dam body is 9069.0m3/s, and the discharge is huge. Three working conditions are selected for evaluating the atomization degree of flood discharge, including surface hole, deep hole combined flood discharge and surface hole and deep hole separate flood discharge. The specific parameters are shown in Table 1. Table 1. Test conditions and opening mode table of Jinping hydropower station. Working condition Characteristic flood Water level difference [m] Discharge volume [m 3 /s] Opening Mode Water entry angle Depth of water cushion [m] Surface hole Deep hole Total 1 Design 0.1% 219.93 3675 5394 9069 4 Surface +5 Deep 58 61.5 2 Frequent (1) 225.28 0 5454 5454 5 Deep 53 3 Frequent (2) 229 2681

Study on Comprehensive Hazard Assessment Technology of Flood Discharge Atomization of Jinping Hydropower Station