As one of the most important aquatic products raising bases of Guangdong province in China, Zhelin Bay has
experienced high intensity of exploitation and utilization during the recent decades. This paper aims at the dynamic
change of Zhelin Bay, multi-source data of digital land use map, topographical map, and geomorphological map of the
National Coastal Survey of china in 1980s, Landsat TM satellite imagery obtained in 2000, land use data in 2000, as well
as SPOT imagery and land use data from the newly National 908 Remote Sensing Survey were used. The data were
preprocessed in a uniform mathematical foundation at first. Water area rate, open degree, and morphology coefficient
which can depict the change of bays in different respect were taken as quantitative indicators to analyze the
morphological changes of Zhelin Bay. The classification based on these indicators was then made in each period of time.
Finally, the comprehensive spatio-temporal change of the bay was evaluated in a Changing Index model. Analysis results
show that, during the latest 20 years, the water area rate has changed evidently from 0.8503 to 0.7410, leading to the
category of Zhelin Bay changed from entire-water bay to much-water bay. Besides, the Changing Index of Zhelin Bay
during the latest 20 years is 0.44%. Reasons for the change were discussed and some suggestions were given in the end
of the paper.
Coastal zone, as the interactive area between ocean and land, is a very complex and fragile system. Coastal zone supports
diverse and productive coastal ecosystems and provides significant ecological, cultural, and economic benefits to human
beings. However, with the rapid growth in both population and economy, coastal ecosystems are being subjected to ever
increasing pressure. Coastal zone that was formerly wisely used is being destroyed in the pursuit of economic wealth
which has greatly threaded human's sustainable development. Beside excessive resource exploitation and environmental
pollution, unreasonable land use is also another important fact which could cause great damages to the coastal
ecosystems. The purpose of this paper is to evaluate the degree of land exploitation and utilization in Zhuhai coastal zone
which locates at the west of Pearl River Estuary. A new model named Multidimensional-Vectors Model which is suitable
to coastal zone was established. Land-use data of Zhuhai coastal zone in 1995, 2000, and 2005 was used. The
exploitative intensity of land-use between 1995 to 2000, and 2000 to 2005 was calculated by this model. Main
characteristics of exploitative intensity of land in Zhuhai coastal zone can be generalized as follows: Areas with high
exploitative intensity is mainly concentrated alone the coastal line except some small area scattered in the region far
away from the sea. Area with high exploitative intensity from 1995 to 2000 is larger than that from 2000 to 2005, and the
spatial distribution of high exploitative intensity during 1995 to 2000 period is more concentrative than that form 2000 to
2005.
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