Morphodynamic Process of Dachan Bay in Pearl River Estuary Affected by Human Activities

The surrounding area of the Dachan Bay in the Pearl River Estuary has one of the highest economic development rates of China. Rapid industrialization and urbanization has resulted in extensive changes in land use, including the tidal flat reclamation and harbor construction. For the analysis of the morphological changes of the Dachan Bay, multi-temporal Landsat images have been digitized by using the integrated RS and GIS technique, and the digital elevation modes in different years were set up in combination with topographical and nautical data. From the change analysis, it can be concluded that the sea area of the Dachan Bay decreases to 6.0 km2, by 87.6% between 1907a and 2011a due to the large-scale tidal flat reclamation, and the maximum downcutting depth of the seabed in the entrance area is over 10m mainly caused by extensive harbor construction. Based on the research of the morphological change in recent decades, it is suggested that the human activities have become one of the major factors affecting the morphological processes of the Dachan Bay.

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Impact of human activities on subaqueous topographic change in Lingding Bay of the Pearl River estuary, China, during 1955–2013

Scientific Reports ◽

10.1038/srep37742 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 25

Author(s):

Z. Y. Wu ◽

Yoshiki Saito ◽

D. N. Zhao ◽

J. Q. Zhou ◽

Z. Y. Cao ◽

...

Keyword(s):

Human Activities ◽

River Estuary ◽

Pearl River Estuary ◽

Pearl River ◽

The Pearl River Estuary ◽

The Pearl River

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Study on the Characteristics of Temporal and Spatial Variation of Suspended Sediment in the Pearl River Estuary

Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B ◽

10.1115/omae2009-79033 ◽

2009 ◽

Author(s):

Wei Zhang ◽

Mingyuan Yang ◽

Xiaolin Zhang ◽

Peipei Dong

Keyword(s):

Spatial Variation ◽

Suspended Sediment ◽

Large Scale ◽

Research Result ◽

River Estuary ◽

Pearl River Estuary ◽

Tidal Range ◽

Pearl River ◽

Temporal And Spatial Variation ◽

Temporal And Spatial

The Lingding Estuary is one of the main parts of the whole Pearl River Delta, which lies in the South Sea, China. It is about 60 km wide from Hong Kong in the east to Macao in the west and the water areas are approximately 2110 km2. The process of suspended sediment movement is influenced by many factors, such as the estuarine geometry, tidal range and ravine flows etc.. In this paper, large scale hydrological observations in the Lingding Estuary have been respectively carried out in July, 2003. Based on these data, characteristics of temporal and spatial variation of suspended sediment concentration (SSC) in the Lingding Estuary are studied. The research result shows that SSC changes with the variation of tide current and runoff, the sediment re-suspension is often occurred 1–2 hour following the flood or ebb tide. The maximum turbidity appears near the gauging station V3. In the flood dominant stage, the sediments move towards the mainland, while during the ebb sediments move down.

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Research on Trend of Nutrients and its Response to Human Activities in the Pearl River Estuary

E3S Web of Conferences ◽

10.1051/e3sconf/202014502081 ◽

2020 ◽

Vol 145 ◽

pp. 02081

Author(s):

Yingxian Long ◽

Qiang Sun ◽

Kun Yang

Keyword(s):

Human Activities ◽

Inorganic Nitrogen ◽

River Estuary ◽

Principal Component ◽

Pearl River Estuary ◽

Pearl River ◽

Wastewater Discharge ◽

Industrial Output ◽

The Pearl River Estuary ◽

The Pearl River

This is a research on the change of nutrients and its structure in the Pearl River Estuary by the principal component analysis (PCA) according to the data and materials on water quality observation in the last 30 years around the Pearl River Estuary. Results showed that inorganic nitrogen (DIN) presented an obvious increase trend in the last 30 years, while phosphate and silicate presented an outstanding decrease trend in this area by the influence of human activities. The average N/P ratio increased by 1.44 times, the Si/N ratio decreased by 66.8%, the Si/P ratio decreased by 18.5%, and the structure of nutrients changed significantly. According to the results of PCA, the first two principal components (PC) were extracted. PC1 was associated with GDP, population, industrial output value and wastewater discharge, which explained 80.9% of the variance. PC2 was characterized by cultivated land area, which explained 14.6% of the variance. It indicates that the change of nutrients content and structure in the Pearl River Estuary was closely related to economic development and industrial pollution discharge, and the effect of the change of land use and land cover on the change of nutrients should not be ignored.

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Large-scale Long Time-series InSAR Land Subsidence Research in the Pearl River Estuary

10.21203/rs.3.rs-35922/v1 ◽

2020 ◽

Author(s):

xiaowen luo ◽

Hui Gao ◽

Ziyin Wu ◽

Shoujun Li ◽

Jihong Shang ◽

...

Keyword(s):

Time Series ◽

Land Subsidence ◽

Large Scale ◽

Human Life ◽

River Estuary ◽

Pearl River Estuary ◽

Pearl River ◽

Temporal And Spatial Distribution ◽

The Pearl River Estuary ◽

The Pearl River

Abstract Due to the influence of human activity and changes in natural conditions, the Pearl River Estuary (PRE) has emerged as a large-scale area of land subsidence, which represents a serious threat to the quality of human life and sustainable socio-economic development. In response to the problems associated with the lack of man-made targets of traditional time-series Interferometric Synthetic Aperture Radar (InSAR) in estuaries and other coastal areas, a distributed scatterers (DS) InSAR method based on a spatially adaptive filter and an eigendecomposition algorithm to estimating the optimal phase of statistically homogeneous DS was applied to obtain subsidence data using 67 scenes Sentinel-1A SAR images covering the PRE. The temporal and spatial distribution characteristics of land subsidence were analyzed. The results suggest that land subsidence in the PRE was widespread and unevenly distributed with large differences between 2015 and 2018. The northwest and southeast are the main subsidence areas, with a maximum sedimentation rate greater than 25 mm/year.

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