The Influence Of Channel And Coastline Evolution On Landscape Pattern In Yellow River Delta Based On Geo-information Map

The 1988,1998,2009 and 2016 four period remote sensing image and GIS technology were used,it integrated quantitative thinking of landscape ecological and graphic thinking of geoscience-information atlas.The influence of the evolution of channel and coastline on the landscape pattern in the Yellow River delta from three aspects of landscape structure,landscape shape and landscape succession was explored in different periods of the sub-delta and coastal wetland research area.The results show that:(1)The impacts of channel at different times have different impacts on the landscape structure of the Yellow River Delta.Not only the arable land is the first dominant landscape type in the sub-delta research area,but also it occupies a larger proportion in earlier formed areas.In the No.1 sub-delta research area,except for arable land and construction land,other types of landscapes accounted for a smaller proportion of the total area and changeing with time is not obvious;In the No.2 sub-delta research area,the proportion of the total area of the salt field and the aquaculture pool increased by nearly 40% from 2009 to 2016;In the No.3 sub-delta research area,various types of landscape tended to average the proportion of the total area;In the No.4 sub-delta research area,arable land and light beach accounted for a high proportion of the total area,reaching about 24%.(2)The impacts of coastlines at different times have different impacts on the landscape structure of the Yellow River Delta,too.In the No.1 coastal wetlands research area,the proportion of the total area of arable land is about 60%,while the proportion of the sea area is close to 0;In the No.2 and No.3 coastal wetlands research area,with the passage of time,the proportions of the total area of construction landsalt fields and aquaculture ponds are gradually increasing,while the light beach,Tamarisk+Suaeda Community and Reed+Imperata Community underwent a gradual downward trend.In No.4 coastal wetland research area,rivers and artificial waters accounted for the largest proportion of the total area,reaching over 32%.(3)The change of the average fractal dimension of landscape is influenced by many factorsThe influence of river and coastal evolution on various landscape shapes is different,and the degree of influence on different types of landscape is also different.Therefore,in different periods,the changes of the shape characteristics of the same landscape are different between different research areas,but they have their own characteristics that conform to the law of natural and social development.(4)Characteristics of landscape type gravity,the sub-delta different periods and coastal wetland of landscape succession into the following categories:Sub-Delta Human Activities-led,Abandoned Channel–led,Row Water Channel-led,Coastal Wetland Human Activity-led,Abandoned Coast-led,New Coast-led.