A weak reflection fiber grating-based fresh water lens resource monitoring method

Abstract

This invention discloses a method for monitoring freshwater lens resources based on weak-reflection fiber Bragg gratings, relating to the fields of marine environmental monitoring and geological engineering technology. The method includes the following steps: drilling several vertical monitoring holes sequentially from the central area towards the nearshore edge along a planned monitoring profile on the land surface; constructing a sensor array using weak-reflection fiber Bragg grating sensing cables, and deploying sensor monitoring units at a high density according to a preset spacing; and reconstructing the overall outline of the brackish water transition zone based on the vertical salinity profile data fed back by the sensor monitoring units, and analyzing the changes in the freshwater lens. This invention, employing the aforementioned method for monitoring freshwater lens resources based on weak-reflection fiber Bragg gratings, solves the problem of long-term survival in highly corrosive underground environments, avoids the risk of missing key information about the transition zone due to sparse monitoring points, monitors water levels at single points, and fully reflects the advance and retreat patterns of the lens edge with tidal fluctuations, providing an intuitive and reliable decision-making basis for the protective exploitation of freshwater resources.

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