The Tidal Year: a memoir on grief, swimming and sisterhood AS HEARD ON RADIO 4

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Guo, L. et al. River-tide dynamics: Exploration of nonstationary and nonlinear tidal behavior in the Yangtze River estuary. J. Geophys. Res-Oceans 120, 3499–3521, https://doi.org/10.1002/2014jc010491 (2015). Boon, J. D. & Byrne, R. J. On basin hyposmetry and the morphodynamic response of coastal inlet systems. Mar. Geol. 40, 27–48, https://doi.org/10.1016/0025-3227(81)90041-4 (1981). Flinchem, E. P. & Jay, D. A. An introduction to wavelet transform tidal analysis methods. Estuar. Coast. Shelf S 51, 177–200, https://doi.org/10.1006/ecss.2000.0586 (2000). Funny, sad and honest, but ultimately also hopeful, The Tidal Year is a wonderful and welcome addition to the growing canon of books exploring the restorative power of wild swimming.' SOPHIE PIERCE

Talke, S.A., et al. (2020). Sea level, tidal and river flow trends in the Lower Columbia River Estuary, 1853-present. Journal of Geophysical Research-Oceans, 125(3). Aubrey, D. G. & Speer, P. E. A study of non-linear tidal propagation in shallow inlet/estuarine systems Part I: Observations. Estuarine, Coast. Shelf Sci. 21, 185–205, https://doi.org/10.1016/0272-7714(85)90096-4 (1985). Stevens, A. J., Clarke, D. & Nicholls, R. J. Trends in reported flooding in the UK: 1884–2013. Hydrological Sciences Journal 61, 50–63 (2015). Weisse, R. & Plüβ, A. Storm-related sea level variations along the North Sea coast as simulated by a high-resolution model 1958–2002. Ocean Dynamics 56, 16–25 (2005). Sibley, A., Cox, D. & Titley, H. Coastal flooding in England and Wales from Atlantic and North Sea storms during the 2013/2014 winter. Weather 70, 62–70 (2015).Alebregtse, N. C. & de Swart, H. E. Effect of river discharge and geometry on tides and net water transport in an estuarine network, an idealized model applied to the Yangtze Estuary. Cont. Shelf Res. 123, 29–49, https://doi.org/10.1016/j.csr.2016.003.028 (2016). Haigh, I. D., Nicholls, R. & Wells, N. A comparison of the main methods for estimating probabilities of extreme still water levels. Coastal Engineering 57, 838–849 (2010). Immersive and compelling. I read it in a single day! Everyone should take a plunge into this book.’ CATHY RENTZENBRINK Hydrological data United Kingdom 1989 Yearbook: an account of rainfall, river flows, groundwater levels and river water quality January to December 1989 Marcos, M., Puyol, B., Calafat, F. M. & Wöppelmann, G. Sea level changes at Tenerife Island (NE Tropical Atlantic) since 1927. Journal of Geophysical Research: Oceans 118(10), 4899–4910 (2013).

Bernier, N. B. & Thompson, K. R. Predicting the frequency of storm surges and extreme sea levels in the northwest Atlantic. J. Geophys. Res. 111, C10009 (2006).Generally, nonlinear tidal interactions are the main drivers of tidal duration asymmetry within the YRE, of which M 2/M 4 is the most important contributor with the largest magnitude (Fig. 4), followed by M 2/S 2/MS 4, which accounts for ~30% of the total tidal skewness. M 2/M 4/M 6 ranks third. Overall, the asymmetry induced by these nonlinear effects first increases and then decreases, in line with the spatial evolution of the overall tidal duration asymmetry. In comparison, the K 1/O 1/M 2 triad has a relatively small skewness value and retain a slight increase from the lower reaches to the tidal river. This indicates that the tide entering the channel is flood-dominant within the YRE. However, K 1/O 1/M 2 in the YRE behaves differently from other tidal systems, such as the southern California coast 31, 78 and the Pearl River Delta 16, where tidal duration asymmetry is ebb-dominant prior to nonlinear tidal distortions within the tidal systems. This difference may be related to channel geometrical properties and the interactions between tidal constituents 31. Seasonal variations in tidal dynamics Seasonal variations in tidal amplitudes and phases ADMIRALTY EasyTide service provides free access to 7-day (current + 6)tidal predictions for over 600port locations around the British Isles, displayed as a tide table and tidal curve. The 20th Century Reanalysis (V2) Project http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_ReanV2.html (2015) Hallegatte, S., Green, C., Nicholls, R. J. & Corfee-Morlot, J. Future flood losses in major coastal cities. Nat. Clim. Chang 3, 802–806 (2013). Van de Kreeke, J. & Robaczewska, K. Tide-induced residual transport of coarse sediment; Application to the EMS estuary. Neth. J. Sea Res. 31, 209–220, https://doi.org/10.1016/0077-7579(93)90022-k (1993).