Flood change area inversion method based on GNSS-R
A changing area and inversion technology, applied to instruments, measuring devices, scientific instruments, etc., can solve problems such as limited resolution of microwave remote sensing satellites
Pending Publication Date: 2022-05-13
CHANGAN UNIV
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[0005] Aiming at the problem of limited resolution of microwave remote sensing satellites, this application provides a GNSS-R based flood change regional inversion method. By processing CYGNSS L1 data and using the different sensitivity of reflectivity to different ground objects, strong The area submerged by floods during rainfall, the results show that using CYGNSS data can obtain flood monitoring results with higher spatial resolution, and the inversion results can well show the movement of floods between cities in a short period of time
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[0053]Henan Province, a provincial-level administrative region of China, is located in central China (31°23′-36°22′ north latitude, 110°21′-116°39′ east longitude), with a terrain high in the west and low in the east, consisting of plains, basins, mountains and hills. The land straddles the four major river basins of the Haihe River, the Yellow River, the Huaihe River and the Yangtze River, with an average annual rainfall of 500-900 mm. The central and northern regions of Henan Province were hit by heavy rainfall. The floods and other secondary disasters caused by heavy rainfall have greatly endangered the property and life safety of local people.
[0054] Aiming at some areas of Henan Province being hit by the strongest rainfall on record, due to the highly dynamic nature of flood disasters, rapid and timely spatial monitoring is conducive to early disaster prevention, mid-term disaster relief and post-disaster reconstruction. The emergence of Global Navigation Satellite Syst...
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The invention discloses a GNSS-R-based flood change area inversion method, relates to the technical field of flood monitoring, and analyzes time and space changes of surface reflectance before and after heavy rainfall based on sensitivity of CYGNSS data to surface water from a scattering mechanism of signals to obtain distribution of flood disasters at different stages of heavy rainfall. According to the flood change area inversion method based on GNSS-R provided by the invention, the CYGNSS L1 data is processed, the range of flood submerging during a heavy rainfall period is obtained by utilizing the fact that the reflectivity has different sensitivities to different ground features, and the result shows that a flood monitoring result with a relatively high spatial resolution can be obtained by utilizing the CYGNSS data; and the inversion result can well display the movement of flood between cities in a short time.
Description
technical field [0001] The invention relates to the technical field of flood monitoring, in particular to a GNSS-R based flood change area inversion method. Background technique [0002] When a flood occurs, timely and accurate mapping of the scope of the submerged area can not only provide rescue and disaster relief personnel with decision-making, but also better understand the temporal and spatial evolution characteristics of floods and provide technical support for flood forecasting and early warning. Satellite remote sensing is considered to be an effective method for monitoring flood disasters. However, when floods occur, the surface is usually covered by thick clouds, so optical remote sensing is limited, and microwave remote sensing is not affected by clouds and vegetation to a certain extent. Therefore, satellite remote sensing technology Not the best means of monitoring flood hazards, the data provided by existing microwave remote sensing satellites have limited spa...
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IPC IPC(8): G01S19/37G01N22/00
CPCG01S19/37G01N22/00
Inventor 张双成马中民李振洪刘奇胡胜伟冯钰璇赵贺斌鲍琳周昕姜楗文
Owner CHANGAN UNIV