299 results about "Risk source" patented technology

A method and system for triaging and monitoring a risk source based on risk categorization. The system comprising a risk management server comprising a risk triage module configured to identify a risk source, receive information associated with the risk source, determine a category risk of the risk source, probe an inherent risk of the risk source, and configure scorecard monitoring for the risk source. The system further comprises a communications interface communicatively coupled to one or more client devices.

The invention provides a water quality model based regional environment risk assessment method. The water quality model based regional environment risk assessment method includes five steps of establishing a regional environment risk source information database, and utilizing a Monte Carlo algorithm to simulate discharge of risk source pollutants; selecting a water quality model, and constructing a water quality model which meets characteristics of an assessment region source intensity water quality response relationship; calculating vulnerability indexes of risk receptors by using a fuzzy integral method with the risk assessment goal of influence on water ecology, human health and social economy; utilizing the water quality model to predict the distribution of regional pollutant concentration under all possible source intensity situations, and analyzing dangerousness of risk sources; characterizing regional environment risks with a risk curve under the synthesis of dangerousness of the risk sources and vulnerability indexes of the receptors. According to the risk curve, regional environment risk assessment can be performed, high-risk regions, and key risk sources and vulnerary receptors are identified, so that a reference is provided for planning a targeted region risk prevention and control scheme.

The invention discloses a method for planning the global path of a robot under risk source environment, which aims at providing a method for planning the global path capable of ensuring the robot to quickly accomplish tasks in high efficiency under the risk source environment; the method comprises the following steps of: (1) detecting and determining the information of the work environment of therobot, wherein the information comprises the starting point and the target point of the robot, the position and the shape of an obstruction, and the position of a risk source; (2) building the mode for the work environment of the robot; (3) defining the length of the path and the risk degree as two performance indexes for evaluating the good and bad of the path, wherein the two performance indexes are two target functions of the path planning problem; (4) globally optimizing the two target functions defined in the step (3) by utilizing improved multi-target particle group optimal algorithm soas to obtain a group of Pareto optimal path collection; (5) adopting a fuzzy membership function to simulate the preference of the decision maker on the task, and selecting an approving eclectic solution from the Pareto optimal path collection as the final moving path of the robot.

The invention discloses an environment risk source pre-warning system, comprising a data collector, a data server, a risk real-time evaluation system and a warner. The data collector is used for collecting real-time monitoring data of detection points in an environment risk source. An environment risk source information database for recording environment risk source basic information and a threshold value database for recording the threshold values corresponding to the real-time monitoring data of the detection points are installed in the data server. The risk real-time evaluation system is used for carrying out security evaluation on the environment risk source and calculating the risk degree of the environment risk source. The warner is used for carrying out selective warning according to the risk degree of the environment risk source. According to the system, the risk evaluation and pre-warning can be carried out on the environment risk source, a monitor can be helped to take countermeasures effectively and timely, and losses resulting from a risk event can be reduced to the lowest.

The invention provides a regional lightning disaster risk evaluation method. The method is characterized by comprising the following steps of: (a), determining regional lightning disaster risk evaluation index systems U; (b), making danger level standards V for each evaluation index system; (c), calculating the weight coefficient W of each index by quoting an analytic hierarchy process; (d), calculating the membership degree of each quantitative index by quoting a membership degree function; (e), performing fuzzy comprehensive evaluation and calculating a correlation matrix; and (f) determining a risk level and a risk source and proposing lightning protective measures. The method is wide in application range, and meets the lightning risk evaluation in different industries such as flammables and explosives, railways, large-scale bridges and travels, and different types of buildings (structures). Various types of regional lightning risks are subjected to qualitative and quantitative comprehensive analysis by adopting a reasonable hierarchical comprehensive analysis method, so that the problem that influencing factors at each level are difficult to quantify is effectively solved.

The invention discloses an actually measured data-based spacecraft component assembly simulation method. The assembly simulation method includes the following steps that a parametrized three-dimensional rapid modeling method is utilized to generate actually measured dimension-based three-dimensional small component models after final assembly inspection personnel actually measure and input the dimensions of key small component interfaces into a corresponding parametrized three-dimensional modeling system; a reverse point cloud curved surface fitting method is utilized to convert the surface shapes of real objects of large key components into discrete geometric coordinate points, and on the basis, the modeling of complex curved surfaces is carried out, so that reverse three-dimensional digitalized models of the large key components are formed; the assembly process is simulated and analyzed; ergonomics is simulated and evaluated. By combining a virtual reality scene with reverse real object modeling, the actually measured data-based spacecraft component assembly simulation method disclosed by the invention detects interference points and risk sources in advance to find out assembly incoordination and other problems, thus increasing the reliability of the final spacecraft assembly process and the efficiency of final assembly.

The invention discloses a freight transportation safety evaluation model based on a man-vehicle-road-freight multi-risk source. The model is characterized in that a freight transportation safety sensing system is constructed and driver, vehicle, road (environment) and freight information is obtained; a causing factor of a freight vehicle accident is analyzed by using an accident causation theory, attribute sets of four kinds of man, vehicle, road, and freight risk sources are defined, and the attributed sets are analyzed and screened by using an accident tree analysis method; according to the screened attribute sets, a freight transportation safety risk index system is built by using an analytic hierarchy process and weights of the driver, vehicle, road(environment) and freight information factors for accident occurrence are determined; and according to the established integrated freight risk evaluation index system as well as all evaluation index weights, a freight transportation safety risk evaluation model is established by using a fuzzy evaluation theory. Therefore, the technical support for intelligent early warning can be provided for the road freight transportation safety work.

The invention provides a method for tracing pollution sources in emergency events. The method is characterized by comprising steps of 1, constructing source-quality response scene databases, to be more specific, creating fixed and mobile pollution source databases in certain ranges of river basins and hydrological scene databases of river basins where projects are located, simulating pollution statues of the project river basins due to pollutants of each pollution source under the conditions of different hydrological scenes and different emission amounts and creating the source-quality response scene databases in project regions; 2, carrying out source tracing analysis and computation, to be more specific, investigating and screening the pollution sources in the source-quality response scene databases according to feature information of the pollutants and hydrological regime information, finding out possible pollution sources which meet requirements of screening targets, constructing target libraries, analyzing pollution procedure fitting degrees of the target libraries, sorting the target libraries according to the fitting degrees, determining risk sources which possibly cause the emergency pollution accidents, and further conforming the risk sources by means of verification. The method has the advantage that the locations and the pollutant emission amounts of the pollution sources can be quickly determined by the aid of the method.

The invention provides a method for determining a regional ecological risk early warning, which belongs to the field of ecological risk protection. The method comprises the following steps of: determining regional ecological risk composite indexes; sending an early warning of the regional environmental risk state according to the regional ecological risk composite indexes; and determining a bad state early warning and a regional environmental risk trend early warning to further determine a slow deterioration early warning and a rapid deterioration early warning. Based on remote sensing investigations of a researched region environmental element, the method constructs a regional ecological risk assessment index system for determining how to adopt the regional ecological risk early warning by combining the characteristic of regional industrial development stress, considering the characteristics of a risk source, receptor sensitivity and the like, and using the theories and methods such as system dynamics, landscape ecology, GIS analysis, AHP and Delphi. The method provides a scientific basis and a support for regional ecological risk management.

The invention discloses an LNG ship remote monitoring system. An AIS system of an LNG ship supervision platform is used for analyzing an AIS message to obtain information of a supervised ship so as to position the supervised ship, and a ship position is displayed through an electronic chart system; corresponding supervision data and query statistical information of the ship are displayed for people with different permissions at a client based on the permission management. The system disclosed by the invention integrates an information technology, a networking technology, an intelligent technology and a visualization technology, can cover the whole LNG ship and a sea area in an LNG wharf to perform the remote monitoring on the LNG ship, thereby achieving aims of remote visualization monitoring, information acquisition, paperless office, and all-weather supervision; the problems of insufficient functions of traditional monitoring equipment, difficulty in performing automatic evaluation on navigation safety of the LNG ship, the risk source certification and analytic hierarchy method of LNG ship berthing and departing and unloading job, and fuzzy comprehensive evaluationare solved, and the interconnection and intercommunication among port and waterway, pilotage, port control and maritime affairs departments, an LNG receiving station and the like can be effectively realized.

The invention provides a power distribution network risk identification system and method. The method comprises the following steps: obtaining multi-source information data; analyzing data needed by risks and extracting features of the risks; analyzing the features of the risks; calculating risk identification indexes and determining states of a power grid; analyzing and determining positions andreasons of the risks; simulating the risks and analyzing the sever degree of the risks; and comprehensively assessing the risks and publishing risk early-warning information. The system comprises thefollowing parts: a multi-source information system and an intelligent monitoring terminal are connected with a data center through a data interface module and a communication device; the data center is connected with a data analyzing and processing module, and the data analyzing and processing module and a risk visualization module are connected with a risk identification modeling and analyzing module, a risk source positioning module and a risk reason identification and analysis module; and a risk simulation module is connected with all the above modules except the multi-source information system and the intelligent monitoring terminal. The solution offers an accurate risk early-warning result and provides technical support for power grid operators to provide a practical and effective decision basis.

Aiming at the problem that suspected risk sources of sudden water environment pollution accidents are difficult to quickly inspect, the invention discloses a tracing method for the suspected risk sources of the sudden water environment pollution accidents. The tracing method comprises the steps as follows: (1) creating an enterprise risk information database; (2) carrying out pollution accident emergency monitoring and information acquisition; (3) carrying out preliminary screening on the suspected risk sources of the accidents; (4) positioning the suspected risk sources of the sudden accidents; (5) carrying out secondary screening on the suspected risk sources of the accidents; (6) carrying out compliance analysis on the accident scenes of the suspected risk sources; and (7) carrying out scene evidence and validation on the suspected risk sources. According to the created standard inspection method, the problems of subjectivity, lagging and large workload and the like in the process of inspecting the suspected risk sources of the sudden water environment pollution accidents are solved, so that the emergency processes of the water environment pollution accidents can be conveniently standardized by the main environmental-protection agency.

The invention discloses an identification method of atmosphere pollution risk source based on the analysis of accident overall process, which comprises the following steps that: (1) critical value is identified according to environmental pollution accident risk source, and an atmosphere pollution accident risk unit is preliminarily selected; (2) maximum credible accident source intensity of the atmosphere pollution is determined; (3) accident danger range of risk source is calculated; (4) harmful consequences such as personnel injury, public scare, ecological loss and the like caused by the atmosphere pollution risk source is evaluated; (5) comprehensive harmful consequence of the atmosphere environmental pollution accident is normalized and superposed; (6) risk value of atmosphere pollution accident risk source is calculated; (7) grade of atmosphere pollution accident risk source is determined. The method solves the problems of the traditional environmental pollution accident risk source identification method that the pertinence is poor, the precision is low, the risk level of the atmosphere pollution accident cannot be effectively determined, and the like, establishes an atmosphere pollution accident risk source identification method based on the analysis of the accident overall process which has strong universality, and provides a technical method for the circumvention and emergency of atmosphere pollution accident.

The invention provides an area integrated environment risk evaluation and portioning method, for reflecting the environment risk status of an area. The method comprises the following steps: obtaining area environment risk correlation information, and according to an area integrated environment risk system theory, through combination with the obtained area environment risk correlation information, constructing an area integrated environment risk evaluation index system, wherein the index system comprises a risk source harm index, a risk field intensity index, a risk acceptor vulnerability index and a risk control mechanism validity index; determining an index weight and quantification model of the index system; according to the determined index weight and quantification model of the index system, obtaining an area integrated environment risk index; and according to the area integrated environment risk index, performing risk partitioning on the area so as to obtain an area integrated environment risk partitioning graph. The method provided by the invention is applied to the field of environment science and environment risks.

The invention discloses an early epidemic risk situation analysis method for an infectious disease based on an input-diffusion function, which comprises the steps of 1, identifying the scale of an infectious disease input risk source; 2, simulating a risk source propagation spread function; and 3, conducting short-term forecasting on the epidemic risk situation. According to the invention, population flow big data trend judgment and disease propagation and diffusion rules are fused; firstly, the morbidity differences of different regions are explored in the spatial dimension to describe the disease distribution pattern, and the inter-regional population flow scale and trend are analyzed based on population flow big data; then, the potential input risk case scale is measured and calculatedbased on the population flow; the function relationship between the number of potential input cases and the number of locally accumulatively diagnosed cases is counted; and the epidemic situation development characteristics and internal rules are revealed. The development of the epidemic situation is simply, rapidly and accurately monitored, the epidemic risk development situation in the future ispre-judged, and more accurate, more durable and more effective decision support can be provided for prevention and control of infectious diseases.

The invention discloses an establishing method of a water body environment early warning system, comprising the following steps: an automatic monitor monitors a sewage outlet of a risk source in real time; automatic monitoring data is transmitted to a system by a network, and whether the sewage discharge is abnormal or not is judged by the system; if the discharge is abnormal, the automatic monitoring data and a water quality forecasting model are immediately transferred for forecasting the water quality of a downriver environment receptor, and the concentration of the receptor is returned to the system; a hazard evaluation to the receptor is carried out according to the self-nature of the receptor and the forecast concentration of a receptor infectant; and an accident hazard database is transferred to give out an emergency countermeasure for the accident hazard. Based on an information technology, the establishing method of a water body environment early warning system comprehensively applies modern high and new technology means such as a geographical information system, a network, a multimedia, and the like, utilizes a water quality forecasting technology and combines the modern environment risk management theory, thereby providing a running environment with high efficiency and strong practicability for the automated management of the quality of a water body and laying a solid foundation for realizing regional sustainable development.

The invention belongs to the technical field of shield tunnel construction project and in particular relates to a grid reinforcing method of a shield receiving or starting end head and a shield receiving method. The invention aims at the risk source of starting and receiving shield. In the grid reinforcing method of a shield receiving or starting end head, the shield receiving or starting end head is provided with a grid waterproof reinforcing element. The invention has the advantages of completely cutting off water source compensation during final reception so that a shield machine carries out reception and starting under the geological conditions without water, fundamentally changes the original geological conditions, and ensures the safety of the shield. Compared with the traditional methods, the method saves more than 30% of cost once, the reinforcement effect thereof is greatly higher than that of the traditional method, the method reduces at least more than 70% of risk rate, has inestimable benefit and value as subway construction is carried out like a house on fire currently, and has easy operation, inspection and convenient popularization and promotion.

The invention discloses an inner plugging air bag for leakage of a risk source pipeline and a quick plugging method thereof. The plugging device of the risk source pipeline consists of a sealing mechanism, a flow guide mechanism, a retaining mechanism and a fixing mechanism which are connected with one another. In the method, the plugging air bag, an aeration joint external aeration pump, a flow guide pipe connecting nozzle and a flow guide ball valve are used as plugging flow guide elements; and quick plugging for pipeline leakage is realized by aerating the plugging air bag by using extensibility of the rubber air bag. The inner plugging air bag has a simple structure, light weight and a good plugging effect, can be repeatedly used, is suitable for plugging the risk source pipeline of toxic gas and liquid and the like, and can also be used for inner plugging for leakage of a heat pipeline, a water supply pipeline, a chemical industry pipeline and even a large-sized pipeline.

The invention relates to a cloud-model-based power distribution network fault risk identification method. The cloud-model-based power distribution network fault risk identification method is used for solving the problem of identification of a plurality of risk factors which caused power distribution network fault outage and extraction of key risk sources, influences of different outage risk factors on power distribution network fault outage and mapping establishment and achievement between every risk factor and risk assessment results. The technical method adopted in the cloud-model-based power distribution network fault risk identification method comprises digging information of useful values from fault risk assessment indexes through application of advantages of a cloud model in aspect of uncertainty processing, viewing comprehensive assessment results of an index system as representation of severity of power distribution network fault outage risks, utilizing an expected value, entropy and excess entropy of the cloud model to achieve quantitative and qualitative conversion, and correctly achieving fault risk assessment when fault risk index data is not complete. The cloud-model-based power distribution network fault risk identification method achieves risk source identification of a power distribution network fault, provides theoretical basis for relevant departments to take control measures and reduce and prevent risks and has significant economic benefits and social benefits.

The invention discloses an enterprise dual prevention mechanism management system based on an Internet + mode. The invention particularly relates to an analysis and early warning effect on the troubleshot hidden danger closed-loop treatment process and the safety condition of each operation site. The risk grading management module is responsible for dividing risk points, identifying risk sources,evaluating risk grades, making management and control measures and forming a risk management and control list; and the hidden danger checking and treatment module is responsible for carrying out checking content distribution, hidden danger checking, approval and assignment on the risk management and control list formed by the risk grading management module and then carrying out hidden danger rectification and recheck. The system overcomes the defects that the safety management thought is disordered, the pertinence and reasonability of troubleshooting are lacked, and the risk management and control cannot be truly implemented to achieve the current situation of effectively preventing accidents due to independent disconnection operation of a current risk grading management and control and hidden danger troubleshooting treatment double prevention system of an enterprise.

The invention discloses a risk-considered urban power network operation security assessment method. The risk-considered urban power network operation security assessment method comprises the following steps: analyzing an urban power network operating risk source which is divided into two types, namely a small disturbance risk source including both load fluctuation and distributed power supply output fluctuation, and a fault risk source including both internal network faults and external network faults; as for the two risk sources, respectively building static security risk index models and transient security risk index models to assess the urban power network operating safety level. A traditional deterministic security assessment method only attaches importance to the most serious and credible accidents, so that the result is conservative. A probabilistic assessment method overcomes the defect of the deterministic assessment method, and additionally considers the uncertain factor (probability of occurrence). The risk-considered urban power network operation security assessment method is a modification and improvement of the original probabilistic assessment method and can quantify the accident results.

The invention provides a regional comprehensive environmental risk assessment and division method. The environmental risk assessment and division can be regionally carried out to a large extent. The regional comprehensive environmental risk assessment and division method is characterized in that the essential factors of the environmental risks can be analyzed according to the regional comprehensive environmental risk system theory; a regional environmental risk assessment index system can be built, and the essential factors comprise risk sources, risk control mechanisms, risk fields, and risk receptors; the weight values and the assessment values of various indexes in the assessment index system can be determined based on the built assessment index system; the comprehensive environmental risk value of the assessment region can be acquired according to the weight values and the assessment values of various indexes of the assessment index system; the risk division of the assessment region can be carried out according to the preset classification method according to the comprehensive environmental risk value of the assessment region. The regional comprehensive environmental risk assessment and division method is suitable for the environmental science and technology field.

The invention discloses a method for comprehensively evaluating a regional abrupt environmental pollution accident risk. The method comprises the following steps: building a multilayer evaluation index system for the regional environmental pollution accident risk; building a risk source dangerousness quantitative model, a receptor sensitivity quantitative model and a restoring force quantitative model by using an objective weighting method, and acquiring risk source dangerousness indexes, receptor sensitivity indexes and restoring force indexes of different study units in a study region; building an environmental risk receptor vulnerability evaluation concept model and a regional abrupt environmental pollution accident comprehensive risk evaluation concept model, and calculating an environmental risk receptor vulnerability index and a regional environmental pollution accident comprehensive risk index according to the concept models, the risk source dangerousness indexes, the receptor sensitivity indexes and the restoring force indexes; and hierarchically clustering comprehensive environmental risk profiles of evaluation units. Through adoption of the method, a scientific theoretical foundation is laid for regional environmental risk comprehensive management, industrial distribution adjustment and optimization, accident emergency and the like. The method has the advantages of high efficiency, low cost, high accuracy and the like.

Methods and systems are presented for dynamically adjusting a risk classification of a risk source based on classifications of one or more other risk sources. The risk engine may first classify a first risk source as a first risk type based on an initial analysis of the first risk source. Subsequent to classifying the first risk source as the first risk type, the risk engine may determine that a second risk source is associated with a second risk type. Based on the determination that the second risk source is associated with the second risk type, the risk engine may re-classify the first risk source as the second risk type. The risk engine may then use the reclassification of the first risk source to improve network security of an online service provider.

The invention belongs to the field of marine pollution risk assessment and monitoring, and particularly relates to a marine oil spill risk assessment method. The marine oil spill risk assessment method comprises the following steps of (1) risk source assessment; (2) risk diffusion calculation; (3) sensitivity analysis; and (4) oil spill risk division. The concrete operation of the step (2) is that a climate state marine oil spill risk diffusion model is established based on the marine environment, the hydrodynamic characteristics and the wind field variations of different seasons of the research marine area by using an oil particle drift diffusion simulation method, each oil spill risk source risk diffusion field is monthly calculated and the level of the oil spill risk is determined through superposition calculation. The climate state marine oil spill risk diffusion model is established so that the requirement of high-resolution calculation of the oil spill risk diffusion precision can be met, the calculation burden can also be saved and integrated oil spill risk calculation of the marine area level is enabled to be feasible.

The invention discloses a tunnel geology advanced prediction method based on a C / S framework; the method can predict disaster risk of the tunnel geology; every participation unit shall cooperate on a uniform platform; during the tunnel construction process, the risk evaluation report is generated by taking geological survey data as basis and analyzing and judging every monitoring data, geophysical prospecting and exploration results in tunnel construction, so as to guide the avoid risk of tunnel construction while display risk sources by graphics and charts. Meanwhile, quantified judgment standard of the tunnel karst geology disaster risk evaluation applies fuzzy mathematics and expert investigation method, thus the disaster risk can be visually evaluated, and the computer risk evaluation system is convenient to integrate, thus the tunnel karst geology disaster risk valuation is performed by this; the method has great significance in advanced prediction of the tunnel geology.

The invention discloses a large-scale bridge engineering risk assessment method. In the implementation of the method, a work-risk decomposition structure WBS-RBS is adopted to carry out bidirectionaldecomposition on a construction project according to a construction process and risk types, a risk decomposition matrix RBM is constructed, opinion investigation is carried out through a plurality ofexperts in the industry to know risk characteristics, and an initial risk value r is calculated through quantitative classification of risk probability and loss; when the correction weight omega of the risk source is determined, performing risk relative importance judgment and opinion consistency inspection by adopting the FAHP, and performing weighted correction on the risk value; summarizing thesurvey data of the plurality of experts and calculating to obtain a comprehensive risk value; and determining the risk severity level according to the magnitude of the multi-level comparison comprehensive risk value and a risk evaluation index threshold value, so that the evaluation result conforms to the engineering practice. The method can accurately, objectively and systematically identify andevaluate the risk, and can lay a foundation for the safety and high quality of large-scale bridge construction.

The invention relates to a fuzzy comprehensive judgment based subway safety evaluation method with an aim to solve problems about safety evaluation of subway construction. The method includes: establishing a risk index system fully reflecting construction environment characteristics by analyzing and identifying typical risk sources of certain subway construction and determining weights of layers of indicators by adopting a level analysis method; dividing subway safety levels into a I-level safety status, a II-level secondary safety status, a III-level yellow alert, a IV-level orange alert anda V-level red alert; establishing a subway construction risk evaluation model by adopting a second-level fuzzy comprehensive evaluation method and evaluating and grading construction risks of Shenyangsubway line 9. The results indicate that the evaluation method is feasible, the evaluation results are instructive to the construction safety of Shenyang subway, and the method is applicable to riskevaluation of subway construction.

The invention discloses a microvibration blasting process of a metro double-line large-span tunnel. The process is characterized in that a blasting mode using a carbon dioxide phase change cracker as a blasting device achieves a tunnel excavation purpose through the quick expansion effect of liquid-state carbon dioxide in a pipe; the length of the cracker controls the drilling depth to be not smaller than 1.5 m and the aperture to be not bigger than 63 mm; peripheral eye precracking guide holes are drilled; the hole distance is 10-50 cm; and the hole depth is smaller than the depth of cracking holes by 20-30 cm. The microvibration blasting process of the metro double-line large-span tunnel has the following advantages: the blasting mode using the carbon dioxide phase change cracker as the blasting device achieves the tunnel excavation purpose through the quick expansion effect of liquid-state carbon dioxide in the pipe. The process is suitable for vibration reduction blasting construction of urban metro mined tunnels, and is more prominent in effect on the vibration reduction blasting construction aspect of cross super / first-grade risk source, large-span and small-gap tunnels.

The invention provides a water environmental risk source risk representing method in a drainage basin transboundary region. The method is used for evaluating the risk level of a risk source of the drainage basin transboundary region. The risk source of the transboundary region is divided into five categories including a surface source, production enterprises, a centralized treatment place of waste, a chemical storing site and transportation. The method includes the fives steps that first, a risk source risk index system of the transboundary region is constructed, the risk index systems of the five categories of risk sources respectively comprise three first-level indexes and a plurality of second-level indexes, the numbers of the second-level indexes in the risk index systems are different, and the indexes comprise three risk levels of the high risk level, the middle risk level and the low risk level; an information database of the risk sources of the transboundary region is established, values are assigned to all the second-level indexes, and the values of the all the second-level indexes are standardized to [0,1]; then, fuzzy weights of the indexes are determined; next, a fuzzy integration method is adopted for respectively calculating the risk indexes of the risk sources, the self-purification index of environmental mediums, and the vulnerability index of risk receiving bodies; finally, the risk indexes of the risk sources are calculated through the fuzzy integration method so that the risk levels of the risk sources can be represented.