Low-altitude, shallow-water and deep-water integrated geological survey method based on electromagnetic method

Abstract

The invention discloses a low-altitude, shallow-water and deep-water integrated geological survey method based on an electromagnetic method. The method comprises the following steps: acquiring geological data of a bank slope, a shallow-water area and a deep-water area; the water depth and the sludge layer thickness of the reservoir area are determined through a water earthquake or water radar method, and a water body sludge layer model is established; establishing a ground-air and water area observation system; the geological data of the bank slope and the geological data of the shallow water area and the deep water area are preprocessed, and sudden change values in the data are removed; establishing an initial model according to physical parameters in the water body sludge layer model and pre-sampled resistivity physical property parameter distribution; carrying out forward modeling calculation by adopting a layered medium; and establishing objective functions of a low-altitude area, a shallow water area and a deep water area, and performing inversion by adopting a quasi-Newton method. By means of the scheme, the method has the advantages of being simple in logic, reliable in geological survey and the like, and has high practical value and popularization value in the technical field of geological survey of bank slopes, shallow water and deep water areas.

Description

technical field [0001] The invention relates to the technical field of geological survey of bank slope, shallow water and deep water, in particular to an integrated geological survey method of low altitude, shallow water and deep water based on electromagnetic method. Background technique [0002] At present, there are many regional construction projects such as hydropower stations, natural reservoirs, drinking water projects, and ecological lakes in my country. Among them, the artificial construction projects are affected by various geological environmental factors during the operation process, and there are problems such as leakage, which have a great impact on the safety and stability of the reservoir area. It has a great impact, especially the leakage of hydropower stations seriously affects energy storage, resulting in a great waste of resources and economic losses. Due to the huge amount of hydropower storage and the complex environment, the high-level water body has a ...

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Problems solved by technology

[0005] First of all, in actual conditions, the leakage point may exist on the bank slope, and the water level in the reservoir area changes in different seasons. If the water level is lower than the leakage location, the detection effect of the above two patents will be greatly reduced, and the bank slope Most mountains have steep inclinations, making ground surveying difficult

[0006] Secondly, in shallow water and deep water areas, since the direct current method uses the geometric bathymetry method, it is necessary to increase the distance between the positive and negative electrodes to penetrate the water layer and silt, which is extremely inconvenient for underwater measurement. In actual situations, long wires may It will be entangled by aquatic plants, and there is a great hidden danger to the safety measurement of the instrument;

[0007] Finally, the above two patents did not consider the attenuation and shielding effect of the water body and the silt layer on the direct current. When the leakage point under the water area is small, the effective signal will be greatly suppressed by the water body and the silt layer, making it difficult for the small leakage point to be effective. Measurement

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