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Spring tides occur twice each lunar month all year long without regard to the season. Neap tides, which also occur twice a month, happen when the sun and moon are at right angles to each other. . This occurs twice each month. The moon appears new (dark) when it is directly between the Earth and the sun. Animation of spring and neap tides. Together, the gravitational pull of the moon and the sun affect the Earth's tides on a monthly basis. When the sun, moon, and . Spring tides occur during full or new moons as both the sun and moon are aligned and result in slightly larger than average tidal ranges. Neap . The areas under direct influence may extend up to 7 km from the rivers. . minimum daily tide levels in the rivers may vary as much as 2.5 m during the spring. By carrying out routine maintenance during neap tides, loss of energy is kept to a . it will be noted that the rated head is lower than the available head for spring tides. . Generation in the single-effect mode, from the estuary to the sea (direct . The lag in the occurrence of spring tides with reference to new or full moon is . this method is much less time-consuming than the method of direct tabulation, . tides perigee apogee spring tide neap tide. Notes: . a direct high tide occurs as water rises up toward the moon as it is centered over large bodies of water. Direct evidence that the timing of spawning in a species of shellfish occurs in relation to the twicemonthly pattern of spring tides is to be found in a periwinkle . Not only does the equilibrium tidal model fail to explicate amphidromic circulation, it also does not explain diurnal tides in low latitude positions. It . A barotropic high-resolution numerical model of the Chilean Inland Sea was implemented. •. The impact of the spring-neap tides cycle was assessed.