Observation and Understanding of the Coastal Zone During the Han-Tang Period
The people lived in the Han-Tang period mainly understood the coast and the coastal zone through three ways:The first was that people climbed the hill and looked out at the sea,and the mountains near the sea or looking at the sea were considered to be located on the coastline,and the coast recognized in this way was mainly a mountainous and hilly coast,but also included the piedmont plains;The second,people followed the river into the sea,or entered the river from the sea,and observed the estuarine coast along the way,so that the coast was mainly the plain coast,including the sand bank,sandbar and lagoon formed by the tidal top of the river estuary;Third,people based on the administrative cities of prefectures and counties,determined the distance between the coast and the administrative city of prefecture and county,observed the geographical appearance and changes of the coastal area,and understood the resources and utilization of the coastal area. In the Han-Tang period,a basic understanding of the attributes,specific forms,and coastal changes (silting or landslide) of each part of China's long coast was formed,and sea ponds were built in some coastal sections to form artificial coasts. The understanding of the coast in the Han-Tang period was mainly dominated by the dynastic state,based on the understanding of the coastal zone on land and facing the sea,therefore,the main focus was on the coastline and the supratidal zone;however,the understanding of the intertidal zone and the subtidal zone of coastal people had not entered the state-led coastal knowledge system.
coastcoastal zonecoastal morphologyobservation and understandingHan-Tang period
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