ISW Early Warning via Baroclinic Mode Acoustic Inversion
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Solution Overview
Problem
Current methods for monitoring internal solitary waves (ISWs) near offshore platforms are limited by small monitoring ranges of in-situ measurements and inaccuracies or misjudgments caused by optical and SAR remote sensors, especially under adverse weather conditions, leading to incomplete and unreliable early warning services.
Innovation Solution
An ISW early warning method based on a baroclinic mode, utilizing hydrophones and bottom-founded transducers to measure sound pressure, solving hydrodynamic equations, constructing seawater sound velocity equations, and applying genetic algorithms to determine the amplitude of the baroclinic mode for accurate prediction and continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in-situ measurement with sensors is used to measure water disturbances, then measurement precision is improved, but area of stationary object deteriorates
Solution Approach 1:
The patent uses acoustic waves as an intermediary to transmit information about ISW characteristics over large distances. The acoustic sensor detects sound pressure changes caused by ISWs, and the baroclinic mode theoretical model serves as a mediator to infer ISW amplitude and properties from these acoustic measurements, enabling both high precision and large monitoring range.
Solution Approach 2:
The patent replaces direct mechanical/optical measurement systems with an acoustic measurement system. Instead of using optical sensors that require line-of-sight or mechanical arrays for wide coverage, the system uses acoustic wave propagation which naturally covers large areas underwater, resolving the contradiction between measurement precision and monitoring range.
2Area of stationary object
If SAR and optical remote sensors are used to observe sea state, then area of stationary object is improved, but measurement precision deteriorates
Solution Approach 1:
The patent introduces acoustic waves as an intermediary that penetrates water effectively unlike optical waves. The acoustic sensor detects ISW-induced sound pressure changes, and the baroclinic mode model acts as a theoretical intermediary to accurately infer underwater ISW characteristics, achieving both wide coverage and high precision.
Solution Approach 2:
The patent changes the measurement parameter from optical properties (sea surface reflection) to acoustic properties (sound pressure). This parameter change allows penetration through water and weather interference, maintaining measurement precision while achieving wide monitoring coverage through acoustic wave propagation.
3Area of stationary object
If optical remote sensor is used to observe sea state, then area of stationary object is improved, but reliability deteriorates
Solution Approach 1:
The patent changes the observation parameter from optical (affected by weather, clouds, rain) to acoustic (sound pressure). Acoustic waves are not affected by weather conditions or orbital constraints, enabling continuous 24-hour monitoring and improving service reliability while maintaining wide monitoring coverage.
4Area of stationary object
If large number of sensors are provided for extensive coverage, then area of stationary object is improved, but device complexity deteriorates
Solution Approach 1:
The patent segments the monitoring function into two parts: a single acoustic sensor for wide-area detection and a baroclinic mode theoretical model for information processing and inference. This segmentation eliminates the need for multiple sensors while maintaining extensive coverage, reducing device complexity.
Solution Approach 2:
The baroclinic mode theoretical model serves as an intermediary that processes acoustic sensor data to infer ISW characteristics. This single model replaces the need for multiple sensors and complex sensor arrays, achieving extensive coverage with minimal hardware while reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides large-scale, uninterrupted acoustic early warnings, ensuring the safety of offshore platforms by accurately predicting ISWs with high precision and continuous real-time monitoring, unaffected by weather or surface characteristics.
Implementation Method 1
providing a hydrophone and a bottom-founded transmitting transducer in a sea area of an offshore platform, and acquiring an actually measured sound pressure
Implementation Method 2
transforming the seawater sound velocity equation to obtain a relational expression between an amplitude of the baroclinic mode and a seawater sound velocity
Data Source
AI summary
An internal solitary wave (ISW) early warning method for an offshore platform based on a baroclinic mode includes the following steps: S1: providing a hydrophone and a bottom-founded transmitting transducer in a sea area of an offshore platform, and acquiring an actually measured sound pressure; S2: solving a hydrodynamic equation to obtain a baroclinic mode of the sea area of the offshore platform; S3: constructing a seawater sound velocity equation according to the baroclinic mode; S4: transforming the seawater sound velocity equation to obtain a relational expression between an amplitude of the baroclinic mode and a seawater sound velocity; S5: solving, according to the actually measured sound pressure, and the relational expression between the amplitude of the baroclinic mode and the seawater sound velocity, the amplitude of the baroclinic mode with a genetic algorithm (GA); and S6: performing monitoring and early warning on an ISW.