Comprehensive evaluation method for multi-index normal cloud of water quality of underground water

Abstract

The invention discloses a comprehensive evaluation method for the multi-index normal cloud of the water quality of underground water. The method comprises the following steps that: 1: according to main factors which influence the water quality of the underground water, combining with the combined action of physical ingredients, chemical ingredients and biological ingredients in a water body to establish an evaluation index system of the water quality of the underground water; 2: on the basis of the current situation of the water quality of the underground water in China, an underground water quality standard in China and the highest requirements of the water quality of domestic drinking water and industrial and agricultural water, carrying out underground water quality classification, and determining the evaluation level of the water quality of the underground water; 3: adopting a clustering weight method to determine the weight of each risk evaluation index; 4: carrying out calculation to determine cloud model digital features of the water quality evaluation of the underground water of different levels, and generating a cloud model of which the evaluation factor belongs to a certain stability level by virtue of a normal cloud generator; and 5: reading the actual measurement data of a sample to be evaluated, combining with each evaluation index membership certainty degree and weight obtained by calculation, and evaluating the water quality level of the underground water by a level corresponding to the maximum value of a comprehensive certainty degree.

Description

technical field [0001] The invention relates to a multi-index normal cloud comprehensive evaluation method for groundwater quality. Background technique [0002] Water is an indispensable natural resource for the survival and development of human society, and it promotes social progress and national economic development. As an important part of water resources, groundwater plays a very important role in people's life, economic construction and environmental protection. In recent years, the unreasonable development and excessive utilization of groundwater have led to frequent problems such as groundwater level decline, water quality deterioration, and serious pollution. The groundwater in most cities in my country has been polluted to varying degrees, seriously hindering economic prosperity and social development. Groundwater quality evaluation is an important part of water resources evaluation. How to scientifically select groundwater quality evaluation methods to make accu...

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Problems solved by technology

However, the above evaluation methods seldom consider the fuzziness, randomness and uncertainty of the evaluation of groundwater quality at the same time, and there are certain defects in practical application. For example, the single factor index method cannot reflect the overall situation of groundwater quality. It is difficult to evaluate or test, and it is not suitable for the comprehensive evaluation of groundwater quality; the Nemerow index method is relatively concentrated on the seriously polluted water quality level, and has low sensitivity to water quality changes; the fuzzy comprehensive evaluation method cannot solve the problem of information duplication caused by the correlation of evaluation indicators. low precision etc.

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