Abstract
Using Landsat TM and OLI multispectral image data, the accuracy of extracting sea area from different water body indices is compared. Finally, the improved normalized water body index (MNDWI) is selected to study the dynamic characteristics of the coastline and the progress of reclamation of Dalian in 1996, 2005, and 2015. The results show that: from 1996 to 2005, the area of land reclamation in Dalian reached 31.58km2, and 83.55km2 for 2015-2015. It is mainly used for dock construction, industrial land, aquaculture ponds, port docks, construction sites, residents Land, commercial and financial land, etc.; from 1996 to 2015, the total length of the coastline increased by 132.77km. The length of the artificial shoreline increased significantly, with its continuity in spatial distribution increased; the length of the bedrock shoreline was reduced due to the destruction of reclamation projects. Although large-scale land reclamation has brought good economic and social benefits to the local area, it also has a large impact on the marine and forest ecological environment. It is recommended to moderately develop coastal zone resources and further strengthen monitoring and supervision mechanisms.
Highlights
Reclamation refers to the conversion of the original sea area, lake area or river bank to land, which will cause changes in marine dynamic conditions and ecological environment, and it will cause changes in coastline and land along the coast, artificial buildings along the coas and changes of coastal ecology Conditions and marine environment
The data extracted by the Modified Normalized Water Body Index (MNDWI) and Revised Normalized Water Body Index (RNDWI) indices can significantly eliminate the impact of shoals and sandy lands in the estuary, and highlight the boundary characteristics of farming land
This article takes Dalian, Liaoning Province as an example, and uses remote sensing and GIS technology to explore the local coastline changes in the past ten years and its environmental impact based on the three phases of remote sensing images in 1996, 2005, and 2015
Summary
Reclamation refers to the conversion of the original sea area, lake area or river bank to land, which will cause changes in marine dynamic conditions and ecological environment, and it will cause changes in coastline and land along the coast, artificial buildings along the coas and changes of coastal ecology Conditions and marine environment. International research on coastline changes has begun early, with the characteristics of multidisciplinary crosscutting and diversified methods. Siddiqui and others use MSS and Land-sat TM images from 1978 to 1998 to extract the coastline of Karachi area in Pakistan , and the evolution of erosion and deposition of the coastline was reversed[3]. There are few reports on in-depth research and exploration of the impact on the local ecological environment in a certain area[6]. This paper uses remote sensing technology to extract the dynamic changes of the coastline, which has the characteristics of multi-temporal and high resolution. We use GIS to analyze the area, length, and fractal dimensions of the coastline change to determine the land use types and the impact of coastline changes on the ecological environment in the study area. We discuss the impetus of two factors, population size and rapid socioeconomic development, on land reclamation
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