Remote sensing monitoring and change analysis of Yellow River Estuary coastline in the past 42 years

Using object -oriented classification technology , the authors achieved the automatic extraction of the Yellow River Estuary coastline in 1973, 1977, 1984, 1991, 2000, 2010 and 2014, and completed the remote sensing dynamic monitoring and the change analysis for the Yellow River Estuary coastline from 1973 to 2014.The results show that the length of shoreline in the Yellow River Estuary was increased by about 298.8 km2 in the past 42 years overall .The coastline change process had an obvious spatio -temporal characteristics .The change rate was different at different periods and different locations .According to the characteristics of the coastline expanion and retreat , it could be divided into 3 categories:fast silt coastline , strong erosion coastline and erosion regressive coastline .For the driving force , the location of Yellow River port and sea erosion seem to have been the main factors.The coastline was mainly influenced by the flow path of the Yellow River .And, the recent human activity seems to be the third driving force .Human activities, such as port building , saltpan construction and exploitation of coastal resources , have exacerbated the complexity of coastline change .