Definition
A nodal point of a rotary standing wave in a basin, about which co-tidal lines radiate and co-range lines form roughly concentric rings of increasing amplitude. The tidal wave rotates anticlockwise in the northern hemisphere in most basins because of Coriolis deflection. Examples exist in the southern North Sea. Each constituent has its own amphidromes, so a point of zero M2 range may still show a measurable diurnal tide.
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