In relation to tidal gauges, what does TGBM stand for, and what is its main purpose?

TGBM stands for Tide Gauge Benchmark, and its primary purpose is to serve as a reference datum for sea-level observations. In tidal measurements, a benchmark is a critical reference point that allows for the accurate assessment of sea-level changes over time. This is essential for a variety of applications, including navigation, coastal engineering, and climate change research.

By establishing these benchmarks, hydrographic surveyors can ensure that all tidal measurements are compared against the same standard, which helps maintain consistency and accuracy in data collection. This is particularly important in regions where sea levels may be influenced by various factors such as tides, storm surges, and long-term climate change. The use of a tide gauge benchmark is integral to effective monitoring and analysis of tidal fluctuations, enabling researchers and decision-makers to observe trends and patterns in sea-level variation.