Akademik

cycle

annual cycle of fluctuation — годовой цикл колебаний

cycle of dry and wet years — цикл сухих и влажных лет

climatic cycle
cycle of deposition
drainage cycle
erosion cycle
fluctuation cycle
geochemical cycle
hydrological cycle
phreatic cycle
piestic cycle
recovery cycle
runoff cycle
sedimentation cycle
storage cycle
water cycle

Англо-русский гидрогеологический словарь. — Ташкент. . 1979.