Wind fetch

{{short description|Length of water over which a given wind has blown}}

File:Wave forecasting nomogram.png |year=1976 |access-date=10 August 2023}}]]

In oceanography wind fetch, also known as fetch length or simply fetch, is the length of water over which a given wind has blown without obstruction.{{Cite web|url=https://rdrr.io/cran/fetchR/man/fetch.html|title=Fetch: Calculate Wind Fetch in fetchR: Calculate Wind Fetch}}{{Cite web|url=https://www.eoas.ubc.ca/courses/atsc113/sailing/met_concepts/08-met-waves/8a-wave-formation/index.html|title=Wave Formation}} Fetch is used in geography and meteorology and its effects are usually associated with sea state and when it reaches shore it is the main factor that creates storm surge which leads to coastal erosion and flooding.{{citation needed|date=February 2021}} It also plays a large part in longshore drift.{{citation needed|date=February 2021}}{{clarify|what role in longshore drift|date=February 2021}}

Fetch length, along with the wind speed (wind strength), and duration, determines the size (sea state) of waves produced. If the wind direction is constant, the longer the fetch and the greater the wind speed, the more wind energy is transferred to the water surface and the larger the resulting sea state will be.November's fury by Michael Schumaker University of Minnesota Press Sea state will increase over time until local energy dissipation balances energy transfer to the water from the wind and a fully developed sea results.{{citation needed|date=February 2021}}