A Method for Constructing Background Values ​​of River and Lake Sediments Based on Curvature Extremes and Dynamic Partitioning

By using dynamic zoning and curvature extremum method, combined with multi-element measurement and comprehensive weighting method, the problems of sampling representativeness and calculation objectivity in the construction of background values ​​of river and lake sediments were solved, and high-precision background value construction and evaluation were achieved.

CN122307062APending Publication Date: 2026-06-30CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINESE RES ACAD OF ENVIRONMENTAL SCI
Filing Date
2026-03-19
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for determining background heavy metal values ​​in river and lake sediments suffer from problems such as insufficient sample representativeness, inaccurate background layer identification, and lack of objectivity in calculations. In particular, they are difficult to accurately separate natural background from anthropogenic pollution in large, shallow lakes.

Method used

A method based on curvature extrema and dynamic zoning was adopted. Through dynamic zoning point layout, optimized sampling, objective calculation and scientific synthesis, including zoning boundary delineation, multi-element measurement, background layer identification, cumulative frequency curve analysis and comprehensive weighting method, background values ​​of river and lake sediments were constructed.

Benefits of technology

It improves the spatial representativeness and accuracy of background values, making it suitable for sediment pollution diagnosis and ecological risk assessment under complex hydrological conditions, and ensuring the scientific validity and credibility of the calculation results.

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Abstract

This invention discloses a method for constructing background values ​​of river and lake sediments based on curvature extrema and dynamic zoning, relating to the field of environmental benchmarking and ecological risk assessment technology. The method includes the following steps: zonal sampling and multi-element determination; construction of a background sediment database; construction of zonal background values; calculation of the entire lake's background value; and three-way verification of the background value. This invention verifies the natural background values ​​of heavy metals in river and lake sediments through dynamic zonal sampling, geometric feature analysis, and multi-source verification. It provides a dynamic zonal sampling strategy that can truly reflect the spatial heterogeneity of river and lake sediments, establishes a background sediment identification system that balances cost and accuracy, and includes both precise approaches based on sophisticated instruments and practical approaches based on empirical knowledge. This enhances the applicability of the method under different conditions. An objective background value calculation model based on data geometric features is introduced to eliminate the biases caused by subjective threshold settings and outlier sensitivity in traditional statistical methods.
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