A river water quality prediction and an evaluation method of water quality influencing factors

Abstract

The invention discloses a river water quality prediction and an evaluation method of water quality influencing factors. The method comprises the following steps: firstly, extracting historical data of river water quality and watershed characteristics of corresponding sampling points to form an original training set; Secondly, through the bagging algorithm, randomly selecting samples from the original training set, and constructing several sub-training sets . third, generating a decision tree by selecting split attribute according to that characteristics of different watersheds, and constructa random forest model according to the decision tree; Fourth, evaluating the simulation effect of the model; 5, acquiring watershed characteristic data of a point to be predicted, putting that data into a stochastic forest model, and obtaining corresponding water quality prediction data; Sixth, assessing the impact of different basin characteristics on river water quality. The relationship modelbetween watershed characteristics including watershed hydrology, climate, geographical characteristics, seasonal factors, human influence and the like and river water quality is built, river water quality index data is accurately predicted according to watershed characteristics of a target point and importance of the influence of a watershed characteristic on water quality is evaluated.

Description

technical field [0001] The invention belongs to the technical field of water quality prediction, and more specifically relates to a river water quality prediction method and a method for evaluating water quality influencing factors. Background technique [0002] As my country's requirements for water environment quality are getting higher and higher, it is very necessary to scientifically manage the water environment of river basins and protect the water ecosystem. Among them, accurate river water quality data is the basis for carrying out water environment management and formulating water environment protection strategies, and evaluating the impact of river basin characteristics on river water quality is a prerequisite for water quality governance. The water quality and watershed characteristics data of rivers have the following main characteristics: First, the water quality data have large temporal and spatial distribution differences, and are affected by various watershed...

AI Technical Summary

Problems solved by technology

However, there is a complex nonlinear relationship between river water quality parameters and its watershed characteristics influencing factors, and there are also complex interactions between these variables. Water quality data and data of water quality basin characteristics influencing factors often have missing values ​​and singular values.

The existence of these problems leads to a large error between the prediction results of the existing technology and the measured data, and the simulation accuracy and accuracy of the model are not satisfactory.

Moreover, the above-mentioned models can only predict water quality, and cannot judge the influence of various river basin characteristic factors on water quality, so it is difficult to form an effective river water quality control plan.

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