Barrier lake flooding range surveying and mapping method based on whole-process remote sensing data analysis

Abstract

The invention discloses a barrier lake flooding range surveying and mapping method based on whole-process remote sensing data analysis, and the method comprises the steps: carrying out the quick calculation of the reservoir capacity of a barrier lake through employing a multi-grid discrete surface integral algorithm based on DEM remote sensing data; based on the reservoir capacity calculation result of the dammed lake, calculating the reservoir area flooding range by adopting a grid flooding algorithm, and performing graphical surveying and mapping display; introducing the longitude and latitude coordinates of the upstream residential point of the dammed lake, visually displaying the residential point on a graph, the upstream flooding disaster situation of the dammed lake under different water levels can be obtained, and decision support is provided for subsequent organization of safe evacuation of residents; and calculating and statistically analyzing the key technical parameters of the barrier lake according to a corresponding calculation formula, such as the maximum tail water length, the reservoir area submerging area and the water storage change characteristics. The defects that a traditional surveying and mapping method is limited in application condition and insufficient in timeliness are overcome, rapid surveying and mapping calculation is conducted on the upstream flooding condition of the barrier lake in the whole process based on DEM remote sensing data, and key technical information is provided for emergency rescue work of the barrier lake.

Description

technical field [0001] The invention relates to the fields of surveying and mapping and water conservancy engineering, in particular to a method for surveying and mapping the submerged range of a dammed lake based on the analysis of whole-process remote sensing data. Background technique [0002] Lakes formed by landslides or debris flow disasters cutting off natural channels are called barrier lakes. The secondary disasters caused by the barrier lake can be mainly divided into two categories: one is that the river bed is blocked by the natural rockfill dam formed by the landslide, and the river water loses the discharge channel or the discharge capacity is small. After the dam is accumulated, the water level of the barrier lake rises day by day, and the submerged area of ​​the reservoir area gradually expands, causing great inundation losses to the upstream residents, fields, houses, engineering facilities, etc.; Extraordinary floods that exceed the original flood control ...

AI Technical Summary

Problems solved by technology

The secondary disasters caused by the barrier lake can be mainly divided into two categories: one is that the river bed is blocked by the natural rockfill dam formed by the landslide, and the river water loses the discharge channel or the discharge capacity is small. After the dam is accumulated, the water level of the barrier lake rises day by day, and the submerged area of ​​the reservoir area gradually expands, causing great inundation losses to the upstream residents, fields, houses, engineering facilities, etc.; Extraordinary floods that exceed the original flood control standards of the river, bringing extremely serious flood threats to urban residents and buildings along the river

[0003] The current research on barrier lakes mainly focuses on the risk prediction of barrier lake outburst, the control method of barrier dam discharge, and the analysis of flood evolution in outburst. However, there is little analysis on the reservoir flood disaster caused by impoundment in the upper reaches of the barrier lake.

[0004] Most of the barrier lakes formed by sudden geological disasters occur in deep mountains and canyons, the environment is relatively harsh, the available basic data is extremely scarce, and the urgency of emergency rescue makes it difficult to apply traditional surveying and mapping methods

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