Agricultural watershed surface water nitrogen concentration rapid prediction method based on SAS function

By combining SAS function theory with nitrogen kinetics and water age selection kinetics, a nitrogen biogeochemical process model within a control volume is constructed, which solves the problem of inaccurate nitrate kinetic simulation in existing technologies and realizes efficient, mechanism-based prediction and rapid scenario simulation of nitrate concentration in river channels.

CN122201490APending Publication Date: 2026-06-12HOHAI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HOHAI UNIV
Filing Date
2026-03-11
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing watershed-scale nitrate kinetic models simplify nitrate source input and reaction to diffusion and degradation processes when simulating and quantifying nitrate output, which fails to accurately reflect nitrate kinetics in real watersheds, leading to inaccurate predictions.

⚗Method used

Using SAS function theory, combined with nitrogen kinetics framework and water age selection kinetics, a nitrogen biogeochemical process model within the control volume is constructed. By simulating the biogeochemical processes of nitrogen in the soil region, the nitrogen leaching rate is calculated, and the surface water nitrate concentration is predicted by combining the age equation of water mass conservation.

🎯Benefits of technology

It enables efficient and mechanistic prediction of nitrate concentration in river channels, is suitable for rapid scenario simulation and long-term forecasting, can accurately capture seasonal changes in nitrogen output flux and concentration in watersheds, reduces computational costs, and provides risk management information.

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Abstract

The application discloses a kind of agricultural basin surface water nitrogen concentration rapid prediction method based on SAS function, comprising the following steps: combining nitrogen dynamics framework, simulating the biogeochemical process of nitrogen in soil area, based on total inorganic nitrogen load of soil, combining leaching coefficient and soil humidity function, calculate and output the nitrogen leaching rate of day scale;Age equation of water mass conservation in control volume is constructed, the age probability density function of water stored in the basin is calculated, and the age probability density function of output water is calculated through runoff and evapotranspiration;Age equation of soluble inorganic nitrogen mass conservation in control volume is constructed, the nitrogen leaching flux of day scale is used as source term, and is substituted into the age probability density function of water stored, runoff output and evapotranspiration output in the basin, simulates and calculates nitrate concentration.This method realizes the efficient and mechanism prediction of the time sequence dynamics of river nitrate concentration by coupling the biogeochemical process of basin nitrogen and age selection dynamics.
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