地理漫步·世界地理英语30篇（4）

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大堡礁：珊瑚构筑与海洋流界的空间格局

This vast reef system stretches over two thousand kilometers along Australia’s northeast coast.
Its complex coral structures form habitats shaped by warm, shallow waters and strong tidal currents.
Oceanic boundaries like the East Australian Current steer nutrient flow and larval dispersal across reefs.
Sea surface temperature gradients influence coral bleaching events in spatially uneven patterns.
Geographic isolation of reef sections creates distinct genetic populations among staghorn corals.
Shallow lagoons between reefs and mainland reflect sediment transport controlled by wind and wave direction.
Tectonic stability allows slow reef accretion, yet sea-level rise now threatens vertical growth capacity.
Island platforms within the reef emerge from volcanic foundations overlain by carbonate sediments.
Local bathymetry determines where internal waves break, enhancing nutrient upwelling for plankton blooms.
Coral health maps reveal sharp ecological transitions aligned with cross-shelf current shear zones.