Authors: Qiandong Guo*, University of South Florida, Ruiliang Pu, University of South Florida, Kimberly Tapley, Environmental Protection Commission of Hillsborough County, Jun Cheng, University of South Florida, Jialin Li, Ningbo University
Topics: Remote Sensing, Coastal and Marine
Keywords: Remote sensing, water index, coastal management, US, China
Session Type: Paper
Start / End Time: 8:00 AM / 9:40 AM
Room: Studio 10, Marriott, 2nd Floor
Presentation File: No File Uploaded
The coastal environment has a tremendous effect on the daily life of a large number of people. However, rapid population growth, urbanization and industrialization have exerted intense pressure on the coastal ecosystems, which in turn has a strong negative feedback to the residents. Long-term time series of coastline changes could aid coastal managers in efficiently and effectively managing public resources and this critical coastal habitat. This study monitored coastline changes in Tampa Bay (TB) and Xiangshan Harbor (XH) during the last 30 years via remote sensing and GIS technologies. We proposed a new water index called a weighted normalized difference water index (WNDWI) to extract water bodies from Landsat images. Moreover, two thresholding approaches including the Otsu threshold method and the multiple thresholds method were employed to decide an optimal threshold to segment grey images created by the water index. After delineating the coastlines during the last 30 years, the anthropogenic impacts resulting in the changes were analyzed and a comparison of the shoreline changes at those two locations was conducted. The results indicated that coastlines in TB were mostly stable, while those in XH have been experiencing intensive human interferences and are still in a dramatic developing stage. Major anthropogenic impacts on XH coastlines are land reclamation and aquaculture, resulting in the impacted area of approximately 22 square km over the study period. Although situated at completely different policy system, XH governments and organizations could refer to the coastal management in TB and make sustainable management decisions.