Hydrodynamics and sedimentation induced by large-scale coastal developments in the Keum River Estuary, Korea

2006 ◽  
Vol 68 (3-4) ◽  
pp. 515-528 ◽  
Author(s):  
T.I. Kim ◽  
B.H. Choi ◽  
S.W. Lee
Keyword(s):  
Large Scale ◽  
River Estuary ◽  
Keum River

scholarly journals Microbial Diversity Analysis of Sediment from Nakdong River Estuary in the Republic of Korea Using 16S rRNA Gene Amplicon Sequencing

2018 ◽  
Vol 7 (14) ◽  
Author(s):  
Kyunghoi Kim
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Microbial Diversity ◽  
Large Scale ◽  
Sediment Quality ◽  
River Estuary ◽  
Republic Of Korea ◽  
Rrna Gene ◽  
Nakdong River ◽  
The Republic

Deterioration of sediment quality has been found in the Nakdong River Estuary after large-scale reclamations. Here, I report microbial diversity in sediments of Nakdong River Estuary in the Republic of Korea based on 16S rRNA gene sequencing by next-generation sequencing (NGS) techniques.

Current status and ecological roles of Zostera marina after recovery from large-scale reclamation in the Nakdong River estuary, Korea

2009 ◽  
Vol 81 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Sang Rul Park ◽  
Jong-Hyeob Kim ◽  
Chang-Keun Kang ◽  
Soonmo An ◽  
Ik Kyo Chung ◽  
...  
Keyword(s):  
Zostera Marina ◽  
Large Scale ◽  
River Estuary ◽  
Current Status ◽  
Nakdong River ◽  
Ecological Roles ◽  
The Nakdong River

Large-scale dieback of mangroves in Australia

2017 ◽  
Vol 68 (10) ◽  
pp. 1816 ◽  
Author(s):  
Norman C. Duke ◽  
John M. Kovacs ◽  
Anthony D. Griffiths ◽  
Luke Preece ◽  
Duncan J. E. Hill ◽  
...  
Keyword(s):  
High Temperatures ◽  
Large Scale ◽  
River Estuary ◽  
Moisture Stress ◽  
Northern Territory ◽  
Severe Drought ◽  
Weather Event ◽  
Diagnostic Features ◽  
Causal Factors ◽  
Mangrove Vegetation

This study records and documents the most severe and notable instance ever reported of sudden and widespread dieback of mangrove vegetation. Between late 2015 and early 2016, extensive areas of mangrove tidal wetland vegetation died back along 1000km of the shoreline of Australia’s remote Gulf of Carpentaria. The cause is not fully explained, but the timing was coincident with an extreme weather event; notably one of high temperatures and low precipitation lacking storm winds. The dieback was severe and widespread, affecting more than 7400ha or 6% of mangrove vegetation in the affected area from Roper River estuary in the Northern Territory, east to Karumba in Queensland. At the time, there was an unusually lengthy period of severe drought conditions, unprecedented high temperatures and a temporary drop in sea level. Although consequential moisture stress appears to have contributed to the cause, this occurrence was further coincidental with heat-stressed coral bleaching. This article describes the effect and diagnostic features of this severe dieback event in the Gulf, and considers potential causal factors.

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

2014 ◽  
Vol 638-640 ◽  
pp. 1257-1260
Author(s):  
Rong Yao Ji ◽  
Qun Xu ◽  
Si Ping Mo
Keyword(s):  
Tidal Flat ◽  
Human Activities ◽  
Large Scale ◽  
Morphological Changes ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Landsat Images ◽  
Change Analysis ◽  
Factors Affecting

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.

scholarly journals Buoyancy-driven effects on turbulent diffusivity induced by a river plume in the southern Brazilian shelf

2018 ◽  
Author(s):  
Rafael André Ávila ◽  
Paulo H. R. Calil
Keyword(s):  
Continental Shelf ◽  
Large Scale ◽  
Vertical Mixing ◽  
River Estuary ◽  
River Plume ◽  
La Plata ◽  
Plume Region ◽  
Freshwater Plumes ◽  
Local Water ◽  
Gradient Ratio

Abstract. Freshwater plumes are important flow structures that influence the dynamics and water properties of coastal regions and continental shelves. Turbulence in plume regions is mainly driven by shear instabilities at the interface between plume and oceanic waters, which, in turn, depend on the geometry and outflow of a specific plume region. The Southern Brazilian Shelf presents a highly variable hydrographic distribution modulated by the seasonal wind variation and the freshwater discharge from the La Plata River estuary, which has a significant impact on the continental shelf circulation. This buoyant plume creates strong density gradients and interacts with local water masses resulting in a complex hydrographic pattern. In this study, high resolution hydrography and microstructure measurements were obtained in order to verify the effect of freshwater stratification on vertical mixing in this highly dynamic continental shelf. Results show that the plume is highly stable at southern portions of the shelf, as density displacements, or Thorpe displacements, δT, heat diffusivity, KT, buoyancy flux, Bf, and density gradient ratio, Rp are reduced when compared to the northern areas. Moreover, hydrographic data suggests that the large-scale La Plata River plume has a dynamic mid-field region due to instabilities generated when reaching the shelf break.

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

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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