A Method for Acquisition of Water Seismic Refraction Data by Floating Cable Hydrophone

Abstract

The invention relates to a data acquisition method for underwater seismic refraction wave exploration based on an artificial rammer source and a floating cable, and belongs to the technical field of hydropower engineering investigation. Under the condition of ensuring the target exploration depth, the present invention uses a rammer to strike an aluminum alloy plate to excite seismic waves instead of an explosive source to excite seismic waves, selects an encounter time-distance curve observation system, arranges cross-river profiles on the river surface, and separates the end points of the profiles on both sides of the river Tapping, innovatively applying the floating cable hydrophone used in marine geophysical exploration to the river for the first time to receive seismic signals for field data collection, solves the problem of ecological environment damage and pollution caused by explosive seismic sources, and is green and environmentally friendly. The method of the invention has been successfully applied to hydropower projects at home and abroad, and has achieved good results and strong practicability. It has changed the data acquisition and operation mode of traditional seismic refraction exploration on water, and meets the survey requirements of general shallow seismic engineering. Exploration has broad market prospect and promotion value.

Description

technical field [0001] The invention belongs to the technical field of hydropower engineering survey, specifically belongs to the field of seismic survey of geophysical survey in the technical field of engineering survey, and in particular relates to a method for collecting seismic refraction data on water based on floating cable hydrophones. Background technique [0002] The survey of each stage in the early stage of hydropower is mainly to select a suitable dam site, investigate the geological conditions of the reservoir area, etc., to find out the thickness of the covering layer, the thickness of the weathered layer and the thickness of the impact layer in each area during the engineering exploration, and to understand the velocity of the underlying bedrock longitudinal wave and The distribution range of the low-speed zone. In water conservancy and hydropower geophysical prospecting, water seismic refraction prospecting is the most common geophysical prospecting method. ...

AI Technical Summary

Problems solved by technology

On the one hand, water seismic refraction exploration tends to be carried out in relatively narrow, turbulent rivers, and most of the river sections that do not have navigable conditions; on the other hand, the purchase, transportation, storage, use and destruction of pyrotechnic materials have become extremely difficult. Even some construction sites cannot obtain pyrotechnic materials at all

This has brought great difficulties to the traditional marine seismic exploration work, and it is even impossible to carry out. Therefore, it is necessary to combine the offshore geophysical prospecting method to find a green, high-efficiency, low-cost, safe and reliable marine seismic refraction that replaces the explosive source with a non-explosive source. Data collection method

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