Coastal zone dam stability monitoring and flooding vulnerability evaluation method and system

Abstract

The invention belongs to the technical field of coastal zone dam monitoring, and discloses a coastal zone dam stability monitoring and flooding vulnerability evaluation method and system. The method comprises the steps of preparing a satellite-borne SAR single look complex image and global DEM data for assisting the InSAR time sequence analysis, and obtaining dam point cloud data, sea level risingdata and tide inspection data through employing an unmanned plane laser radar; carrying out data preprocessing to realize dam DEM generation, dam deformation rate acquisition, dam future DEM simulation and dam water level simulation; and performing flooding analysis to realize dam flooding analysis and dam flooding scene display. According to the invention, the combination of the satellite-borneInSAR time sequence analysis deformation rate and the unmanned aerial vehicle-mounted laser radar DEM is realized, and high observation precision and space-time resolution are ensured. According to the invention, three components (tidal component, storm water increase and sea level rise) are synthesized for flooding water level simulation, daily conditions and extreme conditions are simulated at the same time, and over-high water level estimation is avoided.

Description

technical field [0001] The invention belongs to the technical field of monitoring coastal dams, in particular to a method and system for monitoring the stability of coastal dams and assessing submergence vulnerability. Background technique [0002] At present, coastal dam monitoring is usually affected by the spatial and temporal resolution of observation data, and is limited by human and economic costs. Generally speaking, using traditional ground leveling or satellite navigation and positioning system (GNSS) continuous operation reference station to carry out long-term deformation monitoring of dams can achieve relatively high monitoring accuracy, but it is usually limited by grid density and economic applicability . [0003] The current inundation analysis of coastal dams can be mainly divided into two categories: the first type is based on the premise of stable ground, and the water level of different heights is superimposed for inundation analysis; the second type is b...

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Problems solved by technology

[0004] (1) Stability monitoring of coastal dams: the main technical methods include precision leveling, triangular elevation measurement, groundwater well monitoring technology, etc., which have the characteristics of high time resolution and high precision, but only limited discrete point observation, space Low resolution and small coverage, while continuous or periodic monitoring requires high manpower and material costs

[0005] (2) Spatial-temporal resolution and accuracy of coastal dam DEM: Most studies mainly consider the submerged range of a large area, so the DEM data used are often relatively low in spatial resolution and accuracy, and are not suitable for fine structure analysis. Inundation analysis of coastal dams

[0006] (3) Inundation vulnerability analysis of coastal dams: A common inundation analysis method is to use a uniform and constant deformation rate to derive the future DEM on the basis of the existing DEM. Most studies did not conduct DEM simulations, but transformed the deformation rate into Relative to the rise and fall of sea level, and assuming that the surface deformation rate is consistent in space and time, there are two obvious shortcomings in water level simulation. One is to use the average water level for inundation analysis, which weakens extreme weather events. damage under

Second, the water level estimate is too high, which amplifies the impact of inundation

[0008] (1) The stability monitoring of existing coastal dams can only be observed at limited discrete points, with low spatial resolution and small coverage. At the same time, continuous or periodic monitoring requires high manpower and material costs

[0009] (2) The temporal and spatial resolution and accuracy of the existing coastal dam DEM are relatively low, which is not suitable for fine-structure coastal dam inundation analysis

[0010] (3) There is no DEM simulation for the inundation vulnerability analysis of the existing coastal dams; the use of the average water level for inundation analysis or excessive water level estimation expands the impact of inundation

[0014] For problem (3), the existing dam inundation analysis does not predict the future DEM of the dam, but converts the dam deformation into the water level change, ignoring the destructive effect of the deformation itself on the dam structure, especially if there is When the vertical deformation is non-uniform, the shear stress generated is more likely to damage the dam and cause seawater intrusion and submersion of internal infrastructure

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