地理漫步·世界地理英语30篇（1）

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珠江口咸潮与取水调度

Saltwater intrusion occurs when seawater pushes upstream during low-flow winter months in the Pearl River Delta.
This phenomenon threatens freshwater intakes for over 40 million people across Guangdong and Hong Kong.
Water diversion projects like the Dongjiang-Shenzhen Water Supply Project help offset saline incursion by importing mountain-fed water.
Tidal cycles, river discharge, and reservoir releases must be coordinated daily to maintain safe chloride levels at pumping stations.
Remote sensors now monitor salinity in real time, allowing engineers to adjust sluice gates within hours of detection.
Climate change may intensify dry-season saltwater intrusion as rainfall variability increases and sea levels rise gradually.
Urban expansion has reduced natural floodplains that once buffered estuarine salinity fluctuations through groundwater exchange.
The Pearl River’s complex deltaic network—with eight main distributaries—makes centralized control especially challenging.
Integrated modeling combines hydrodynamics, sediment transport, and freshwater demand to optimize multi-reservoir release schedules.
Long-term adaptation includes constructing underground freshwater barriers and expanding desalination capacity near coastal cities.