ORIGINAL RESEARCH
Analyzing the Topographical Evolution
Characteristics of a Bay over
the Last 50 Years
| 1 | The Second Surveying and Mapping Institute of Zhejiang Province, Hangzhou, China |
CORRESPONDING AUTHOR
Han Si
The Second Surveying and Mapping Institute of Zhejiang Province, College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu Province, 210098 Nanjing, China
The Second Surveying and Mapping Institute of Zhejiang Province, College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu Province, 210098 Nanjing, China
Submission date: 2018-01-24
Final revision date: 2018-03-12
Acceptance date: 2018-03-20
Online publication date: 2018-11-09
Publication date: 2019-01-28
Pol. J. Environ. Stud. 2019;28(3):1355–1365
KEYWORDS
TOPICS
ABSTRACT
Based on coastline, water depth, and remote sensing image data of Sanmen Bay over the past
50 years, this research analyzed quantitatively coastline temporal-spatial evolution characteristics
and underwater topography evolution characteristics. The results showed that the total coastline length
of Sanmen Bay first decreased and then increased during the last 50 years. The most obvious change
of total coastline length occurred from the 1960s to the 1990s. However, in this period, the natural
coastline had a higher percentage and a slower change rate. After the 1990s, with artificial interference
gradually increasing, the coastline experienced a change process of the curving coastline becoming
a straight coastline and moving outward continually. Although the length variation is small, the spatial
form of the bay has changed significantly. After 2007 the artificial coastline accounted for more than
70%. From the 1960s to 2015, coastline and 0 meter isobath showed the trend of moving outward.
The bay area decreased and most channels deposited. In general, the underwater topography in 2015 was
more complex than that in the 1960s. Human activity had a critical role of affecting branch development
in the Sanmen Bay area.
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