Ecological Systems and Devices Annotation << Back Spectral Features of Sea Waves and Tidal Oscillations in the Area of the Port of Kholmsk (on the Southwestern Shelf of Sakhalin Island) Rouvinskaya E.A., Kurkina O.E., Kurkin A.A. In this paper, we study the records of a bottom sensor installed in the Tatar Strait near the port of Kholmsk from September 17, 2022 to May 11, 2023. The amplitudes and phases of the tidal wave were extracted and analyzed from the free surface displacement time series preliminarily cleared of noise using the least squares method. A comparison with data obtained from the TPXO 8 tidal model is made. The difference in the amplitude of the displacements of the real and model tides reaches 10 cm, while the maximum tidal displacements at this point are about 25 cm. A periodogram of free surface deviations is constructed for the entire observation period and seasonally (autumn, winter, spring, summer). It is shown that in the high-frequency part of the spectrum one can use the Phillips asymptotic (~f–5; the entire time series, winter), Kitaygorodsky asymptotic (~f–4 for spring) and f–6 for summer and autumn. Keywords: spectral power density, tide, Tatar Strait, wind waves. DOI: 10.25791/esip.12.2024.1491 Pp. 10-20.