Alun
Alun ialah sesiri ombak graviti permukaan yang tidak dijana oleh angin tempatan. Ombak alun kerap mempunyai panjang gelombang panjang tetapi ini berubah-ubah dengan saiz jasad air, contohnya jarang sekali lebih daripada 150 m di Lautan Mediterranean, dan dari peristiwa ke peristiwa, dengan alun kadang-kadang lebih panjang daripada 700 m jauh dari ribut paling teruk. Alun mempunyai julat lebih sempit untuk frekuensi dan arah daripada laut angin, kerana ombak alun telah terserak dari kawasan penjanaannya dan telah melesap.
Rujukan
Pautan luar
- Coastalwatch (Australian swell forecasts)
- Magicseaweed (UK swell forecasting)
- Seabreeze (Australian swell forecasts)
- Swellnet (Australian swell forecasts)
- Stormsurf: Wave Basics (How swells are formed and measured)
- Waverider Buoys (Australian Swell Measuring Devices)
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