Method and system for monitoring dike settlement

Abstract

The invention provides a method and system for monitoring dike settlement, and the method comprises the following steps: obtaining a dike monitoring image through an optical satellite, and then carrying out the preprocessing of the dike monitoring image; converting the preprocessed image coordinates into coordinates in a geodetic coordinate system; calculating the three-dimensional displacement of each feature point according to the coordinate changes of the feature points in the images in different periods so as to obtain the settlement amount of the dam; when the monitored settling volume exceeds a threshold value, alarm prompt information is output. According to the invention, high-precision monitoring of dike settlement can be realized, and reliable data support can be provided for safety assessment of the dike.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy project safety monitoring, and in particular to a method and system for monitoring the settlement of dikes and dams by using optical satellites. Background Art

[0002] As important water conservancy infrastructure, levees and dikes play a key role in flood control, irrigation, and water supply. However, due to the influence of factors such as changes in geological conditions, water level fluctuations, and self-aging, levees and dikes may sink. If the sinking exceeds a certain limit, it may cause structural damage, leakage, and other safety hazards, seriously threatening the safety of life and property in the surrounding areas and the normal operation of water conservancy facilities.

[0003] Traditional methods for monitoring the settlement of levees and dikes mainly rely on ground measurement equipment, such as levels and total stations. These methods have the disadvantages of limited monitoring range, low efficiency, and great influence of terrain and environment. With the development of satellite remote sensing technology, it has become possible to use satellites for large-scale and dynamic settlement monitoring. However, some satellite-based monitoring methods are still insufficient in terms of data processing accuracy, real-time monitoring and reliability, and cannot meet the needs of high-precision monitoring and timely warning of levee settlement. Therefore, it is of great practical significance to develop an efficient and accurate method and system for monitoring the settlement of levees and dikes. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for monitoring the settlement of levees and dikes, which uses optical satellites to obtain monitoring images, and through a series of data processing and analysis, realizes high-precision monitoring and timely early warning of the settlement of levees and dikes, providing a reliable basis for the safety management of levees and dikes.

[0005] The technical solution of the present invention is as follows:

[0006] A method for monitoring dike and dam settlement comprises the following steps:

[0007] Acquiring dike and dam monitoring images through optical satellites, and then preprocessing the dike and dam monitoring images;

[0008] Convert the preprocessed image coordinates into coordinates in the geodetic coordinate system;

[0009] According to the coordinate changes of the feature points in the images at different periods, the three-dimensional displacement of each feature point is calculated, and then the settlement of the dam is obtained;

[0010] When the monitored settlement amount exceeds the threshold, an alarm prompt message is output.

[0011] Furthermore, the preprocessing of the levee and dike monitoring image includes radiation correction, atmospheric correction and image enhancement, wherein the radiation correction adopts a correction algorithm based on the sensor response function, the atmospheric correction utilizes a lookup table method based on the MODTRAN model, and the image enhancement uses a multi-scale Retinex algorithm combined with histogram equalization.

[0012] Furthermore, the coordinates of the preprocessed image are converted into coordinates in the geodetic coordinate system as follows:

[0013] Using the orbital altitude, orbital inclination, satellite attitude angle provided by the satellite, and multiple ground control points with known geodetic coordinates pre-set in the dam area, the pre-processed image coordinates are converted into coordinates in the geodetic coordinate system through the collinear equation.

[0014] Furthermore, the collinear equation is:

[0015]

[0016] Among them, X s , Y s , Z s is the coordinate in the satellite sensor coordinate system, X, Y, Z are the converted geodetic coordinates, X0, Y0, Z0 are the satellite position coordinates, a i , b i , c i , i=1,2,3,4 are the rotation matrix elements determined by the satellite attitude angle.

[0017] Furthermore, the calculation formula of the settlement is:

[0018]

[0019] Among them, X t1 , Y t1 , Z t1 and X t2 , Y t2 , Z t2 They are the geodetic coordinates of the same feature point at different times.

[0020] Furthermore, the feature points are points on the embankment or dike that have obvious geometric features or texture features and are easy to identify and locate in images of different periods, including but not limited to corner points of the edge of the embankment or dike, center points of specific landmarks, and artificially set landmark points on the embankment or dike.

[0021] Furthermore, the threshold is determined comprehensively based on the design standards of dikes and dams, historical settlement data, geological conditions and relevant water conservancy engineering specifications.

[0022] The present invention also provides a dike and dam settlement monitoring system, comprising:

[0023] An image acquisition module, used for acquiring dike and levee monitoring images through optical satellites;

[0024] An image preprocessing module is used to perform radiation correction, atmospheric correction and image enhancement preprocessing on the acquired levee and dike monitoring images;

[0025] A coordinate conversion module is used to convert the pre-processed image coordinates into coordinates in a geodetic coordinate system by using the orbital height, orbital inclination, satellite attitude angle provided by the satellite, and a plurality of ground control points with known geodetic coordinates pre-set in the dam area through a collinear equation;

[0026] The settlement calculation module is used to calculate the three-dimensional displacement of each feature point according to the coordinate changes of the feature point in the images at different periods, and then obtain the settlement of the dam;

[0027] The early warning module is used to set the settlement threshold and monitor the settlement amount in real time. When the monitored settlement amount exceeds the threshold, an alarm prompt message is output.

[0028] Furthermore, the early warning module is connected with a text message platform, a mail server, a professional monitoring platform and an audible and visual alarm device to realize multiple types of alarm prompts.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] Precision monitoring: The present invention can achieve high-precision monitoring of the settlement of embankments and dams by performing fine preprocessing and accurate coordinate conversion of optical satellite images, combined with precise identification of feature points and settlement calculation, and provide reliable data support for the safety assessment of embankments and dams.

[0031] Efficiency and real-time performance: Using optical satellites for monitoring can achieve large-scale and rapid data collection, greatly improving monitoring efficiency. At the same time, the system can process and analyze data in real time. Once the settlement exceeds the threshold, an alarm message will be issued immediately to ensure that relevant personnel can take timely measures to ensure the safety of dikes and dams.

[0032] Reliability and comprehensiveness: The present invention comprehensively considers the design standards of levees and dikes, historical settlement data, geological conditions, and relevant water conservancy engineering specifications, and reasonably determines the settlement threshold, thereby improving the reliability of early warning. At the same time, through the monitoring and analysis of multiple feature points, it is possible to fully understand the settlement of levees and dikes, and avoid missing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0034] Figure 1 A schematic flow chart of the method of the present invention is shown. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a method for monitoring dike and dam settlement, comprising:

[0037] Image acquisition

[0038] Image acquisition: According to the geographical location and monitoring requirements of the levees and dikes, the satellite's observation time and orbital parameters are determined to ensure that the satellite can obtain levee and dike monitoring images on time and accurately.

[0039] Image preprocessing

[0040] Radiation correction: Use ENVI to perform radiation correction on the image based on the sensor response function. Specific steps include reading the radiation value of the image, finding the sensor response function parameters, and adjusting the radiation value according to the response function to eliminate radiation errors caused by differences in the sensor itself and different lighting conditions.

[0041] Atmospheric correction: Atmospheric correction is performed using a lookup table method based on the MODTRAN model. First, the atmospheric parameters, such as water vapor content and aerosol concentration, are determined based on the time and location of image acquisition. Then, the corresponding correction parameters are searched in the lookup table to perform atmospheric correction on the image to remove the influence of the atmosphere on the image.

[0042] Image enhancement: Use the multi-scale Retinex algorithm combined with histogram equalization to enhance the image. The multi-scale Retinex algorithm can enhance the image at different scales and highlight the detailed features of the image; histogram equalization can adjust the grayscale distribution of the image and improve the contrast of the image. The combination of the two can further enhance the recognizability of the image.

[0043] Obtain the satellite's orbital altitude, orbital inclination, satellite attitude angle and other parameters from the satellite operator, and pre-set multiple ground control points with known geodetic coordinates in the dam area. The ground control points should be evenly distributed and have obvious features to facilitate accurate identification and positioning in the image, and the pre-processed image coordinates are converted into coordinates in the geodetic coordinate system through the collinear equation.

[0044]

[0045] Among them, X s , Y s , Z s is the coordinate in the satellite sensor coordinate system, X, Y, Z are the converted geodetic coordinates, X0, Y0, Z0 are the satellite position coordinates, a i , b i , c i , i=1,2,3,4 are the rotation matrix elements determined by the satellite attitude angle.

[0046] According to the geodetic coordinates of the characteristic points at different times, the settlement calculation formula is substituted for calculation.

[0047]

[0048] Among them, X t1 , Y t1 , Z t1 and X t2 , Y t2 , Z t2 They are the geodetic coordinates of the same feature point at different times.

[0049] The settlement of multiple characteristic points is statistically analyzed to obtain the overall settlement of the embankment and dike.

[0050] The settlement threshold is determined comprehensively based on the design standards of levees and dikes, historical settlement data, geological conditions and relevant water conservancy project specifications.

[0051] Real-time monitoring of settlement, when the monitored settlement exceeds the threshold, the alarm mechanism is automatically triggered. SMS warning information is sent to relevant personnel through the SMS platform, email notifications are sent through the mail server, and a warning prompt window pops up on the professional monitoring platform, and the sound and light alarm device is triggered at the same time to remind relevant personnel to pay attention and deal with it in time.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for monitoring embankment and dam settlement, characterized in that: The following steps are involved: Acquiring dike and dam monitoring images through optical satellites, and then preprocessing the dike and dam monitoring images; Convert the preprocessed image coordinates into coordinates in the geodetic coordinate system; According to the coordinate changes of the feature points in the images at different periods, the three-dimensional displacement of each feature point is calculated, and then the settlement of the dam is obtained; When the monitored settlement amount exceeds the threshold, an alarm prompt message is output.

2. The method for monitoring dike and dam settlement according to claim 1, characterized in that: The preprocessing of the dike and levee monitoring image includes radiation correction, atmospheric correction and image enhancement, wherein the radiation correction adopts a correction algorithm based on the sensor response function, the atmospheric correction uses a lookup table method based on the MODTRAN model, and the image enhancement uses a multi-scale Retinex algorithm combined with histogram equalization.

3. The method for monitoring dike and dam settlement according to claim 1, characterized in that: The coordinates of the preprocessed image are converted into the coordinates of the geodetic coordinate system as follows: Using the orbital altitude, orbital inclination, satellite attitude angle provided by the satellite, and multiple ground control points with known geodetic coordinates pre-set in the dam area, the pre-processed image coordinates are converted into coordinates in the geodetic coordinate system through the collinear equation.

4. The method for monitoring dike and dam settlement according to claim 3, characterized in that: The collinear equation is: Among them, X s , Y s , Z s is the coordinate in the satellite sensor coordinate system, X, Y, Z are the converted geodetic coordinates, X0, Y0, Z0 are the satellite position coordinates, a i , b i , c i , i=1,2,3,4 are the rotation matrix elements determined by the satellite attitude angle.

5. The method for monitoring dike and dam settlement according to claim 1, characterized in that: The calculation formula of the settlement is: Among them, X t1 , Y t1 , Z t1 and X t2 , Y t2 , Z t2 They are the geodetic coordinates of the same feature point at different times.

6. The method for monitoring dike and dam settlement according to claim 1, characterized in that: The feature points are points on the embankment that have obvious geometric features or texture features and are easy to identify and locate in images of different periods, including but not limited to corner points on the edge of the embankment, center points of specific landmarks, and artificially set landmark points on the embankment.

7. The method for monitoring dike and dam settlement according to claim 1, characterized in that: The threshold is determined comprehensively based on the design standards of levees and dikes, historical settlement data, geological conditions and relevant water conservancy project specifications.

8. A dike and dam settlement monitoring system, characterized in that: include: An image acquisition module, used for acquiring dike and levee monitoring images through optical satellites; An image preprocessing module is used to perform radiation correction, atmospheric correction and image enhancement preprocessing on the acquired levee and dike monitoring images; A coordinate conversion module is used to convert the pre-processed image coordinates into coordinates in a geodetic coordinate system by using the orbital height, orbital inclination, satellite attitude angle provided by the satellite, and a plurality of ground control points with known geodetic coordinates pre-set in the dam area through a collinear equation; The settlement calculation module is used to calculate the three-dimensional displacement of each feature point according to the coordinate changes of the feature point in the images at different periods, and then obtain the settlement of the dam; The early warning module is used to set the settlement threshold and monitor the settlement amount in real time. When the monitored settlement amount exceeds the threshold, an alarm prompt message is output.

9. The dike and dam settlement monitoring system according to claim 8, characterized in that: The early warning module is connected with a short message platform, a mail server, a professional monitoring platform and an audible and visual alarm device to realize alarm prompts in various ways.

Images