CN-122020816-A - Self-adaptive high Cheng Xiufu and GIS constraint closed-loop judgment method and system

CN122020816ACN 122020816 ACN122020816 ACN 122020816ACN-122020816-A

Abstract

The invention provides a self-adaptive high Cheng Xiufu and GIS constraint closed-loop judgment method and system, which comprise the steps of firstly realizing automatic positioning and refinement treatment on a terrain mutation area through a self-adaptive elevation anomaly recognition and weighting repair algorithm, keeping physical rationality of the terrain while eliminating terrain noise, effectively preventing information loss caused by excessive smoothness, secondly introducing a dynamic evaluation mechanism based on feedback of a two-dimensional hydrodynamic model, utilizing physical indexes such as a Brownian number and a water level residual error to accurately guide an elevation correction process, ensuring efficient convergence and stable operation of a repaired terrain support model in mechanism, finally combining a GIS space hard constraint mechanism, ensuring that a repair result strictly accords with an actual shorelin and a building boundary, realizing intelligentization, standardization and repeatability of an elevation repair process, and providing high-quality basic data support for accurate simulation of complex hydrodynamic scenes such as river channels, reservoirs and urban waterlogging.

Inventors

WANG GUOMIAO
ZHAO HAORAN
WU JIANMING

Assignees

浙江远算科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. A self-adaptive high Cheng Xiufu and GIS constraint closed loop judgment method is characterized by comprising the following steps: calculating gradient values and gradient differences in a neighborhood range based on the digital elevation model, and automatically identifying an elevation abnormal region in the terrain; processing the elevation abnormal region by adopting a self-adaptive restoration algorithm to obtain a restored elevation value, comparing the restored elevation value with an elevation value before restoration, calculating a restoration error and performing iterative optimization to ensure that the restored elevation value meets the requirement of a hydrodynamic model; Space constraint is carried out on the repaired elevation value according to GIS data, whether the repair meets the repair standard is judged, and if yes, a repair result is output; Simulating a flow field and a water level of the repair result through a two-dimensional hydrodynamic model, judging whether the repair result meets the stability requirement of the two-dimensional hydrodynamic model, and evaluating whether hydrodynamic reaction is reasonable, so as to obtain an evaluation result; and automatically judging the repairing effect through a closed loop control mechanism according to the evaluated result and the spatial constraint of the GIS data, executing iterative optimization until the convergence condition is met or the maximum preset iterative times are reached, terminating the repairing program, switching to a result output stage, and performing multidimensional visual display.
2. The adaptive elevation Cheng Xiufu and GIS constrained closed-loop decision method of claim 1, wherein calculating slope values and slope differences in a neighborhood range based on a digital elevation model and automatically identifying an elevation anomaly in terrain comprises: Calculating the gradient value between the current grid unit and surrounding grid units according to a gradient calculation method; calculating the gradient difference between adjacent grid units; judging whether the gradient difference exceeds a preset gradient difference threshold value or not; If yes, determining that the gradient abnormality exists in the current area; generating a gradient abnormal region map according to the gradient abnormal region; And automatically identifying the elevation abnormal region in the terrain according to the gradient abnormal region map.
3. The adaptive high Cheng Xiufu and GIS constraint closed loop determination method according to claim 1, wherein processing the elevation anomaly region by using an adaptive repair algorithm to obtain a repaired elevation value, comparing the repaired elevation value with a pre-repair elevation value, calculating a repair error and performing iterative optimization to ensure that the repaired elevation value meets the requirements of a hydrodynamic model, includes: Calculating multi-criterion weights according to the local gradient, the neighborhood elevation and the hydrodynamic sensitivity factor, wherein the multi-criterion weights are used for distributing different weights for each elevation abnormal region; Calculating the repaired elevation value according to the multi-criterion weight; calculating a repair error according to the repaired elevation value and the elevation value before repair; triggering an iterative repair process when the repair error is larger than a set threshold value, and continuously adjusting the repair increment; After each iteration, when the sum of the repair errors of all grids is smaller than a set convergence threshold, the repaired elevation value meets the requirement of the hydrodynamic model.
4. The adaptive high Cheng Xiufu and GIS constraint closed loop determination method according to claim 1, wherein performing spatial constraint on the repaired elevation value according to GIS data, and determining whether repair meets a repair criterion, and if yes, outputting a repair result, including: importing the GIS data and calculating a terrain smoothness index; Evaluating the reasonability of the restoration according to the terrain smoothness index; performing superposition analysis on the GIS data and the elevation data to determine an area needing to be repaired and an area which is kept as is; After the repair of the repaired area is completed, calculating the repair completion degree; Judging whether the repair standard is met or not according to the repair completion degree; if yes, outputting the repair result; If not, an iterative adjustment of the repair process is triggered.
5. The adaptive high Cheng Xiufu and GIS constraint closed loop determination method according to claim 1, wherein the simulating the flow field and the water level of the repair result through a two-dimensional hydrodynamic model, determining whether the repair result meets the stability requirement of the two-dimensional hydrodynamic model, evaluating whether the hydrodynamic reaction is reasonable, and obtaining an evaluated result includes: the two-dimensional hydrodynamic model uses a continuity equation and a momentum equation as a control equation to describe water flow operation; inputting the repair result into the two-dimensional hydrodynamic model as a bed condition, setting an initial water level or flow velocity condition, and defining a boundary condition so as to solve a two-dimensional shallow water equation; According to the two-dimensional shallow water equation, calculating a water flow velocity field and a water level field, and simulating a calculation process to obtain a simulation result of the water flow field and pollutant diffusion; calculating a residual error of the monitoring model, wherein the residual error is used for representing a calculation error of each iteration; the two-dimensional hydrodynamic model achieves convergence when the sum of residuals of all grid cells is less than a convergence threshold.
6. The adaptive high Cheng Xiufu and GIS constraint closed-loop determination method according to claim 1, wherein according to the result of the evaluation and the spatial constraint of the GIS data, automatically determining a repair effect by a closed-loop control mechanism, performing iterative optimization until a convergence condition is met or a maximum preset number of iterations is reached, terminating a repair procedure, turning to a result output stage, and performing multidimensional visual display, including: Constructing a comprehensive evaluation index system, wherein the comprehensive evaluation index system comprises a hydrodynamic stability index and a spatial consistency index, the hydrodynamic stability index comprises the kurron numbers and residual errors of all grid points, and the spatial consistency index comprises a topography smoothness index and a restoration completion degree; When the sum of residual errors of all grid units is smaller than a convergence threshold value and the Brownian number of all grid points is in a stable interval, judging that the repair is qualified; When the judging result does not reach the preset standard, the accurate positioning and the sensitivity mapping of the abnormal lattice points are realized, and the updated sensitivity factors are obtained; And after the sequence reverse feedback is carried out on the positioned space coordinates of the abnormal grid points, the abnormal type labels and the updated sensitivity factors, starting a new iteration until the convergence condition is met or the maximum preset iteration times are reached, terminating the repair program, transferring to the result output stage, and carrying out multidimensional visual display.
7. The method for determining the closed loop by self-adaptive high Cheng Xiufu and GIS constraint according to claim 6, wherein when the determination result does not reach the preset standard, implementing the accurate positioning and sensitivity mapping of the abnormal lattice point to obtain the updated sensitivity factor, including: Extracting a space discrete error in the calculation process of the two-dimensional hydrodynamic model, and dividing an abnormal region into a destabilization region, a non-convergence fluctuation region and a flow field distortion region according to the property of the space discrete error; taking the instability region, the non-convergence fluctuation region and the flow field distortion region as the identified abnormal lattice points; And automatically updating the sensitivity factors in the self-adaptive repair algorithm according to the identified abnormal lattice points to obtain the updated sensitivity factors.
8. An adaptive high Cheng Xiufu and GIS constrained closed loop decision system, the system comprising: the automatic elevation abnormality identification module is used for calculating gradient values and gradient differences in a neighborhood range based on the digital elevation model and automatically identifying an elevation abnormality area in the terrain; The self-adaptive high Cheng Xiufu algorithm module is used for processing the elevation abnormal region by adopting a self-adaptive repairing algorithm to obtain a repaired elevation value, comparing the repaired elevation value with an elevation value before repairing, calculating a repairing error and performing iterative optimization to ensure that the repaired elevation value meets the requirement of a hydrodynamic model; the GIS space constraint and repair completion judging module is used for carrying out space constraint on the repaired elevation value according to GIS data, judging whether the repair meets the repair standard or not, and outputting a repair result if the repair meets the repair standard; The two-dimensional hydrodynamic model feedback evaluation module is used for simulating a flow field and a water level of the repair result through a two-dimensional hydrodynamic model, judging whether the repair result meets the stability requirement of the two-dimensional hydrodynamic model, evaluating whether hydrodynamic reaction is reasonable, and thus obtaining an evaluation result; And the closed-loop control and result output module is used for automatically judging the repairing effect through a closed-loop control mechanism according to the evaluated result and the spatial constraint of the GIS data, executing iterative optimization until the convergence condition is met or the maximum preset iterative times are reached, terminating the repairing program, switching to a result output stage and performing multidimensional visual display.
9. An electronic device comprising a memory, a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor implements the method of any of the preceding claims 1 to 7 when the computer program is executed.
10. A computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any one of the preceding claims 1 to 7.

Description

Self-adaptive high Cheng Xiufu and GIS constraint closed-loop judgment method and system Technical Field The invention relates to the technical field of ocean hydrodynamics, in particular to a self-adaptive high Cheng Xiufu and GIS constraint closed-loop judgment method and system. Background There have been some related techniques and studies in the field of marine hydrodynamics, especially in terms of high Cheng Xiufu and hydrodynamic simulation in areas near the coast. The prior art mainly focuses on aspects of water flow simulation, terrain restoration, elevation data processing and the like, but has certain limitations in processing complex terrain of coastal zones and restoring elevation data. Digital Elevation Models (DEMs) are widely used in terrain representation and hydrodynamic simulation to provide elevation data for water flow simulation by decomposing the terrain into grid elements. However, there is often an error in elevation data at the boundary between the coastline and the ocean, and in particular, in the terrain assignment process, elevation data around the coastline often has unreasonable values due to deviation of automatic assignment, so that stability and accuracy of the hydrodynamic model are affected. In the prior art, fixed repairing methods are mainly adopted, such as manual correction or simple linear interpolation is adopted to adjust elevation data, but the repairing effect of the methods in complex terrain areas is limited, and complex terrain changes cannot be effectively treated. There is relatively little research on the repair of elevations in coastal zones, and the prior art has focused on the repair of terrains in inland areas. Common repair methods include rule-based interpolation, surface fitting methods, and machine-learning-based repair algorithms. While effective in some situations, these methods often fail to achieve the desired repair effect when dealing with specific terrain changes in the coastal zone (e.g., coastal erosion, sediment changes, etc.). In addition, the traditional elevation restoration method does not consider hydrodynamic factors, so the restored topography may not meet the actual requirements of the hydrodynamic model. In the field of adaptive restoration, the prior art mainly adjusts terrain data through a rule-based algorithm, and a common restoration method based on gradient or curvature is adopted. The method realizes smooth transition of elevation data by optimizing an objective function, and reduces errors generated in the repairing process. However, the prior art lacks a dynamic optimization mechanism based on hydrodynamic model feedback, and cannot adjust the repair strategy in real time according to hydrodynamic response. In the field of hydrodynamic simulation, a two-dimensional hydrodynamic model is widely applied to scenes such as water flow simulation, pollutant diffusion prediction and the like. Existing hydrodynamic models rely primarily on stable elevation data to simulate interactions between water flow and the bed. However, the accuracy requirements of traditional models on elevation data are high, and especially under complex terrain conditions, the stability and accuracy of the models are often affected. The hydrodynamic model in the prior art often assumes that elevation data is accurate and lacks a mechanism for handling data anomalies and errors. In summary, the prior art has the following problems in hydrodynamic simulation and altitude restoration: 1) The method has the advantages that the method is insufficient in elevation repair of complex terrains of coastal zones, and particularly, a technical blank exists in the aspect of elevation abnormality repair at the junction of coastline and ocean; 2) The existing repair method lacks a dynamic feedback mechanism, and cannot adjust the repair strategy in real time according to the simulation result of the hydrodynamic model; 3) The lack of deep coupling between hydrodynamic models and elevation restoration results in failure to fully meet the requirements of hydrodynamic simulation. Disclosure of Invention In view of the above, the invention aims to provide a self-adaptive high Cheng Xiufu and GIS constraint closed-loop judging method and system, which realize the automation and self-adaptive control of an elevation repairing process by introducing multi-source information and dynamically verify a repairing effect by utilizing a two-dimensional hydrodynamic force calculation result, thereby improving the stability, convergence and model precision of a model, and being suitable for various two-dimensional hydrodynamic force simulation scenes such as river channels, reservoirs, urban waterlogging and the like. In a first aspect, an embodiment of the present invention provides a method for determining a closed loop by using a self-adaptive high Cheng Xiufu and a GIS constraint, where the method includes: calculating gradient values and gradient differences in a neighborhood ran