Effects of the anthropogenic activities on the morphological evolution of the Modaomen Estuary, Pearl River Delta, China

Liu, Jia; Pan, Shunqi; Wu, Chaoyu

doi:10.1007/s13344-013-0065-1

Cited by 24 publications

(11 citation statements)

References 2 publications

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“…Presently, studies relating to the impact of human activities on the sediment, hydrodynamics and ecological environment of tidal flats have concentrated on (1) artificial reclamation [16][17][18][19][20][21][22], (2) artificial introduction of plants [23][24][25][26], (3) seawall construction and repair [27][28][29] and (4) harbor and wind farm construction [30,31]. Despite significant interest, the effect of artificial seafood cultivation on the geomorphic evolution process has not been sufficiently studied and lacks thorough analysis due to the difficulty of data acquisition.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Intra-Annual Patterns of Sedimentary Evolution in Tidal Flats Impacted by Laver Cultivation along the Central Jiangsu Coast, China

Sun

Liu

et al. 2019

Applied Sciences

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Human activities such as the rapid development of marine aquaculture in the central Jiangsu coast have had a marked impact on the tidal flat morphology. This research focuses on characterizing the spatial expansion of laver cultivation and its influence on the sedimentary evolution of tidal flats in the central Jiangsu coast. First, seasonal digital elevation models (DEMs) were established using 160 satellite images with medium resolution. Then, laver aquaculture regions were extracted from 50 time-series satellite images to calculate the area and analyze the spatial distribution and expansion of these areas. Finally, seasonal and intra-annual sedimentary evolution patterns of both aquaculture and non-aquaculture regions were determined using the constructed DEMs. Our results show that aquaculture regions have gradually expanded to the north and peripheral domains of the entire sand ridge since 1999 and by 2013, the seaward margins of each sandbank developed into dense cultivation regions. Additionally, the aquaculture regions increased from 11.99 km2 to 295.28 km2. The seasonal sedimentary evolution patterns indicate that deposition occurs during the winter and erosion during the summer. Thus, the aquaculture regions experience deposition in certain elevation intervals during the laver growing period and in the non-growing period, alluvial elevation intervals in the aquaculture regions are eroded and erosive ones are deposited in order to maintain the balance between scouring and silting. The sedimentary evolution of each sandbank is heterogeneous due to their different locations and the difference in sediment transport. The intra-annual evolution pattern is characterized by deposition in the high tidal flats and erosion in low ones. Hydrodynamic conditions and laver cultivation dominate partial sedimentary evolution, which gradually shapes the beach surface.

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Section: Introductionmentioning

confidence: 99%

Seasonal and Intra-Annual Patterns of Sedimentary Evolution in Tidal Flats Impacted by Laver Cultivation along the Central Jiangsu Coast, China

Sun

Liu

et al. 2019

Applied Sciences

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“…The Pearl River basin is a much studied system, with numerous previous studies focusing on diverse system characteristics such as the formation and evolution of the delta 42 , hydrological changes in response to human activities 43 , sediment trapping rates in dams 38,39 , delta shoreline changes 41,44–46 , estuarine engineering (e.g. sand excavation, reclamation, and dike building) 47 and fluvial sediment loads 32,33,38,39,48 .…”

Section: Pearl River Chinamentioning

confidence: 99%

Disentangling the relative impacts of climate change and human activities on fluvial sediment supply to the coast by the world’s large rivers: Pearl River Basin, China

Ranasinghe

Conallin

et al. 2019

Sci Rep

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The world’s large rivers are under stress and experiencing unprecedented changes in hydrology, ecosystems, and fluvial sediment loads. Many of these rivers terminate at the great deltas of the world (home to 500 million people), which depend on fluvial sediments for their very existence. While fluvial sediment loads of large rivers have already been greatly modified by human activities, climate change is expected to further exacerbate the situation. But how does the effect of climate change on fluvial sediment loads compare with that of human impacts? Here, we address this question by combining historical observations and 21 st century projections for one of the world’s largest 25 rivers containing two mega dams; Pearl River, China. Our analysis shows that variations in fluvial sediment supply to the coast from the Pearl river over a ~150 year study period are dominated by human activities. Projected climate change driven 21 st century increases in riverflow will only compensate for about 1% of the human induced deficit in sediment load, leading to the coastal zone being starved of about 6000 Mt of sediment over the remainder of this century. A similar dominance of human impacts on fluvial sediment supply is likely at other heavily engineered rivers.

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“…However, systematic research on the response of the morphological changes of the PRE to diverse human activities (e.g., land reclamation, channel dredging and sand mining) is still insufficient. The time range of the existing studies mostly covers the 1980s to the 2000s, and the spatial scope is limited to specific regions, such as Lingding Bay 30 , 31 , Modaomen sub-estuary 32 , 33 and Huangmao Bay 34 , which are not sufficient to identify the detailed and holistic morphological changes in the PRE and to diagnose the impacts of diverse human activities. Moreover, the deposition flux is an important indicator parameter that reflects the evolution of the estuary and predicts its future development.…”

Section: Introductionmentioning

confidence: 99%

Impact of anthropogenic activities on morphological and deposition flux changes in the Pearl River Estuary, China

Wang

Cai

Zhan

2021

Sci Rep

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The evolution of the Pearl River Estuary (PRE), China in recent decades has been dominated by human activities. Historical admiralty charts and remote sensing images indicated that from 1936 to 2017, the tidal flat area and water area decreased by 23.6 × 107 m2 and 60.7 × 107 m2, respectively. The average advancing rate of the coastline of the PRE to the sea from 1972 to 2017 reached approximately 64.8 m/year, which is several times or even dozens of times that since the mid-Holocene. Land reclamation was the main reason for the dramatic changes in the water area and coastline. Although the water volume of the PRE showed a decreasing trend from 1936 to 2017, the water volume reduction rates for 1996–2005 and 2005–2017 were only 29% (1.27 × 107 m3/year) and 12% (0.53 × 107 m3/year), respectively, of that for 1936–1972. The combined influences of channel dredging, sand mining, and sediment load reduction caused by dam construction have contributed to this change. From the perspective of the filling up of the estuary, channel dredging, sand mining, and dam construction in the river basin are beneficial for prolonging the life of the estuary.

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Effects of the anthropogenic activities on the morphological evolution of the Modaomen Estuary, Pearl River Delta, China

Cited by 24 publications

References 2 publications

Seasonal and Intra-Annual Patterns of Sedimentary Evolution in Tidal Flats Impacted by Laver Cultivation along the Central Jiangsu Coast, China

Seasonal and Intra-Annual Patterns of Sedimentary Evolution in Tidal Flats Impacted by Laver Cultivation along the Central Jiangsu Coast, China

Disentangling the relative impacts of climate change and human activities on fluvial sediment supply to the coast by the world’s large rivers: Pearl River Basin, China

Impact of anthropogenic activities on morphological and deposition flux changes in the Pearl River Estuary, China

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