3 results about "Decay function" patented technology

This invention provides a peak-scale response analysis method based on nested sub-basin division. By constructing a nested sub-basin structure controlled by area thresholds, and based on a unified design storm conditions and hydrological model parameter system, the method calculates peak discharge under different scale conditions by only changing the sub-basin division scale. It also establishes a logarithmic decay function model between peak discharge and the number of sub-basin units, achieving a quantitative expression of peak-scale response. Furthermore, by comparing and analyzing the scale decay coefficients under different design frequencies, the method quantifies the sensitivity of peak discharge to changes in the division scale. This method forms a complete technical process from data acquisition, structure construction, control variable setting, model running to function modeling and sensitivity analysis. It features a clear logical closed loop, strong repeatability, and good generalization, and does not depend on specific hydrological model software or specific watershed conditions. Under the premise of meeting the unified storm input and nested division principles, it can be widely applied.

The application provides a high-precision inversion method for the crustal interior based on aeromagnetic data, which comprises the following steps: preprocessing the aeromagnetic data of a target area, eliminating noise and interference, and extracting regional magnetic anomaly information related to the deep crustal interior; constructing a residual magnetization strength model based on a depth attenuation function, and obtaining the residual magnetization strength of each grid point in the target area according to the target area and the residual magnetization strength model; establishing a nonlinear decay model of the residual magnetization strength with depth based on the residual magnetization strength model, and obtaining the magnetic anomaly strength generated on the ground by each depth layer in the target area by using the nonlinear decay model; and inputting the regional magnetic anomaly information, residual magnetization probability parameters, geological constraints and magnetic anomaly strength into a crustal interior inversion model to obtain the depth prediction value of the target area. The application considers the influence of residual magnetization on the magnetization direction, and improves the inversion precision of the crustal interior.

The invention discloses an unsaturated soil foundation strength deterioration evaluation method and system considering a water immersion effect, and relates to the technical field of geotechnical engineering and electric power infrastructure safety, and the method comprises the following steps: obtaining water content state monitoring data of a foundation under a water immersion condition, determining a wetting front position based on the monitoring data, and extracting a propagation characteristic quantity of the wetting front position; based on the propagation characteristic quantity and the change rate of the water-containing state, matrix suction is corrected, and evolution suction is obtained; comparing the water content state with a preset structure starting criterion, determining an over-threshold water content increment, and accumulating to obtain a structure damage state quantity; based on the structural damage state quantity, an attenuation function is constructed to carry out attenuation modulation on the evolution suction, and equivalent shear strength is obtained; and outputting a foundation strength deterioration evaluation result based on the equivalent shear strength. According to the invention, a closed loop from data monitoring to safety early warning is realized, and a dynamic and accurate evaluation means is provided for foundation safety in an operation period.