havsnivåbaserade

Havsnivåbaserade is a Swedish term used to describe something that is based on sea level. The word is formed from havsnivå (sea level) and baserade (based), and is employed to indicate that a measurement, model, threshold, or decision relies on a sea-level reference rather than another baseline such as land elevation.

The term is common in fields related to coastal management, engineering, and geography. Havsnivåbaserade modeller and analyses use sea level as the reference point for assessing flood risk, calculating design heights for structures, and defining zoning or adaptation strategies. In cartography and surveying, it can denote map and elevation referents anchored to sea level. In climate-related planning, havsnivåbaserade approaches may describe projections and policies that are tied to sea-level scenarios rather than fixed land-based metrics.

Practical use often requires specifying the exact datum or reference level, because sea level is not constant. Tidal fluctuations, seasonal changes, long-term trends, and regional variations complicate interpretation. Data sources include tide gauges and satellite measurements, which contribute to defining the intended sea-level basis for analyses, models, and regulations.

Relation to other terms is strong. Havsnivåbaserade descriptions are contrasted with höjd över havet (height above sea level) or other relative baselines. The concept emphasizes the dependence of evaluations on a sea-level reference, which is crucial for coastal design, flood mitigation, and policy development.

See also: havsnivå, högd och höjdnormer, vattenstånd, baslinje, höjd över havet.