Decreasing sediment threatens coastal shoals in Zhejiang province.
Coastal sediment in Zhejiang Province, China, mainly comes from the Yangtze River Estuary. Over the past 20 years, this sediment has been decreasing, which could impact the formation and sustainability of shoals along the coast. The sediment from the Yangtze River Estuary and the mouth of the Yangtze River Delta is crucial for shaping the shoals in the region. If the Yangtze River Estuary sediment continues to decrease, it will affect the natural deposition rate and artificial shaping of the coast in Zhejiang Province, with effects lasting for more than 30 years.