Found twice, independently
On another stretch of the Brazilian north coast, a systematic elimination of hypotheses ended at an uncomfortable wall: the nearshore transport in the final stretch is not representable in the data within the program's reach.
Two coasts, two seasons, two very different cases, one conclusion. The strip where kitesurfing, surfing and swimming incidents actually happen is not resolved by the global products this program was able to obtain.
Why this is a finding and not a complaint
Global current products are built for the open ocean, and at that job they are remarkable — the same series that exposed this gap also shows the engine matching real alongshore transport over six days. The blindness begins where the grid meets the beach: surf-zone dynamics, rip channels and the final wave-driven transport live below the resolution of the global products available to us. If a higher-resolution regional product exists for this coast, we want to be told — that would change the method, not the conclusion that the strip has to be measured.
Naming the boundary precisely matters. Every drift estimate the program publishes declares it: the strip within roughly 2 km of the beach is not resolved by the underlying data. An estimate that hides its blind zone is more dangerous than no estimate.
What closes the gap
Not better software — measurement. The strip can only be characterised by instruments and tracked objects in the water on the coasts in question. That is the purpose of the program's planned small-scale release experiments with tracked equipment, run carefully from the beach with recovery in the same session. Until that data exists, the honest statement stands: models end 2 km from the sand.
This is research. Estimates are models, not guarantees; a model is never an observation, and a machine estimate is never “confirmed” — only a human reviewing it in the field makes it verified. Nothing on this page is an operational-capability claim, a safety promise, or a prediction of a specific event at a specific place.
References & data
- 1.Copernicus Marine — GLOBAL_ANALYSISFORECAST_PHY_001_024 — The 0.083° (≈9 km) product whose coastal cells define the resolution limit discussed here.
- 2.Diário do Nordeste — Public reporting of the June 2026 kite incident (ref. 1.3772763).
- 3.AYON Ecosystem research archive — Exploratory reconstruction archive and Ceará case series (frozen-configuration hashes on file).