scholarly journals Factors Affecting Catch of Young Flying Fish in Northern Coastal Waters of Nagasaki Prefecture, Japan.

1992 ◽  
Vol 58 (6) ◽  
pp. 1049-1055 ◽  
Author(s):  
Yasuharu Matsumura
Keyword(s):  
Coastal Waters ◽  
Factors Affecting ◽  
Flying Fish ◽  
Nagasaki Prefecture

scholarly journals The features of the coastal fronts in the Eastern Guangdong coastal waters during the downwelling-favorable wind period

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chaoyu Yang ◽  
Haibin Ye
Keyword(s):  
Coastal Waters ◽  
Meteorological Data ◽  
Pearson Correlation ◽  
Ocean Model ◽  
Ekman Pumping ◽  
Zonal Distribution ◽  
Factors Affecting ◽  
China Sea ◽  
Hybrid Coordinate Ocean Model ◽  
The Mean

AbstractA coastal front was detected in the eastern Guangdong (EGD) coastal waters during a downwelling-favorable wind period by using the diffuse attenuation coefficient at 490 nm (Kd(490)). Long-term satellite data, meteorological data and hydrographic data collected from 2003 to 2017 were jointly utilized to analyze the environmental factors affecting coastal fronts. The intensities of the coastal fronts were found to be associated with the downwelling intensity. The monthly mean Kd(490) anomalies in shallow coastal waters less than 25 m deep along the EGD coast and the monthly mean Ekman pumping velocities retrieved by the ERA5 dataset were negatively correlated, with a Pearson correlation of − 0.71. The fronts started in October, became weaker and gradually disappeared after January, extending southwestward from the southeastern coast of Guangdong Province to the Wanshan Archipelago in the South China Sea (SCS). The cross-frontal differences in the mean Kd(490) values could reach 3.7 m−1. Noticeable peaks were found in the meridional distribution of the mean Kd(490) values at 22.5°N and 22.2°N and in the zonal distribution of the mean Kd(490) values at 114.7°E and 114.4°E. The peaks tended to narrow as the latitude increased. The average coastal surface currents obtained from the global Hybrid Coordinate Ocean Model (HYCOM) showed that waters with high nutrient and sediment contents in the Fujian and Zhejiang coastal areas in the southern part of the East China Sea could flow into the SCS. The directions and lengths of the fronts were found to be associated with the flow advection.

Factors Affecting Aerial Surveys of Marine Fauna, and Their Relationship to a Census of Dugongs in the Coastal Waters of the Northern-Territory

1986 ◽  
Vol 13 (1) ◽  
pp. 27 ◽  
Author(s):  
P Bayliss
Keyword(s):  
Coastal Waters ◽  
Total Population ◽  
Surface Condition ◽  
High Tide ◽  
Northern Territory ◽  
Probability Of Detection ◽  
Correction Factors ◽  
Marine Fauna ◽  
Factors Affecting ◽  
Similar Range

Some factors that may affect the aerial counts of dugongs, dolphins and turtles were examined experimentally. Tidal influence did not affect the counts of dugongs or dolphins, but those of turtles increased around high tide. A combined doubling of survey altitude and transect width reduced observed density of all three classes of animals by 50%. The counts of four observers did not differ significantly, but further data counsel caution. Overcast weather depressed counts of dugongs and turtles. Dolphin counts were affected by water surface condition, counts being lowest in choppy seas. A mark-recapture model was used on tandem observations to derive correction factors for groups of animals missed on the surface of a transect. Observers missed between 33% and 75% of dugong groups on the surface, the probability of detection decreasing with increased survey altitude and transect width. A similar range and pattern of probabilities was found for dolphins and turtles. Dugongs were censused in the coastal waters of the Northern Territory between the Daly River and Millingimbi in December 1983, an area of 28 746 km*2. Sampling intensity was 7.6%. A minimum population of 2953 � 530 (standard error) was estimated, an overall relative density of 0.11 � 0.02 km-2. A theoretical correction for submerged dugongs not seen yielded a total population estimate of 38 000, an overall density of 1.46 km-2. The distribution of dugongs in the survey area was patchy, the highest densities being associated with shallow coastal waters, sheltered bays, and large islands.

Factors affecting the accumulation of phytoplankton biomass in Irish estuaries and nearshore coastal waters: A conceptual model

2015 ◽  
Vol 155 ◽  
pp. 75-88 ◽  
Author(s):  
Shane O'Boyle ◽  
Robert Wilkes ◽  
Georgina McDermott ◽  
Sorcha Ní Longphuirt ◽  
Clare Murray
Keyword(s):  
Conceptual Model ◽  
Coastal Waters ◽  
Phytoplankton Biomass ◽  
Factors Affecting

Environmental factors affecting anchovy reproductive potential in the southern coastal waters of Korea

2013 ◽  
Vol 17 (2) ◽  
pp. 133-140 ◽  
Author(s):  
Jin Yeong Kim ◽  
Sun Kil Lee ◽  
Sang Su Kim ◽  
Mun Seong Choi
Keyword(s):  
Environmental Factors ◽  
Coastal Waters ◽  
Reproductive Potential ◽  
Factors Affecting

scholarly journals Risk Coupling Characteristics of Maritime Accidents in Chinese Inland and Coastal Waters Based on N-K Model

2021 ◽  
Vol 10 (1) ◽  
pp. 4
Author(s):  
Jian Deng ◽  
Shaoyong Liu ◽  
Cheng Xie ◽  
Kezhong Liu
Keyword(s):  
Risk Factors ◽  
Coastal Waters ◽  
Factors Affecting ◽  
Inland River ◽  
Maritime Traffic ◽  
Different Types ◽  
Coupling Characteristics ◽  
Location Type ◽  
Different Characteristics ◽  
Specific Degree

The causes of maritime accidents are complex, mostly due to the coupling of four types of factors: human-ship-environmental-management. To effectively analyze the causes of maritime accidents in China, and reveal the risk coupling characteristics of accidents, this paper establishes the N-K model of maritime accident, and calculates and analyzes the four types of coupling of risk factors affecting safety in maritime traffic. This paper collects 922 maritime accidents that occurred in China from 2000 to 2020, and analyzes the location, type, and level of accidents and uses the trigger principle to describe the process of accidents. For marine and inland river accidents, this paper calculates the four types of coupling values of risk factors (single-factor coupling, two-factor coupling, three-factor coupling, four-factor coupling) for comparison and analysis. In addition, this paper calculates the coupling values of six typical maritime accidents of collision, sinking, contact, fire/explosion, stranding, grounding. According to the coupling values and the frequency of sub-factors, this paper analyzes the coupling characteristics of maritime accidents. The results show that in maritime accidents, as the number of risk factors participating in the coupling increases, the coupling value increases, and the multi-factor coupling is more likely to cause accidents. The overall situation of risk coupling causes of maritime accidents is basically consistent with inland river accidents, but they have their own characteristics in the specific degree of risk coupling and the dominant risk elements. In different types of maritime accidents, the risk coupling has different characteristics, and the dominant risk factors are also different.

Biotic and abiotic factors affecting seasonal and spatial distribution of meiofauna and macrophytobenthos in transitional coastal waters

2019 ◽  
Vol 219 ◽  
pp. 328-340 ◽  
Author(s):  
Federica Semprucci ◽  
Chiara Facca ◽  
Federica Ferrigno ◽  
Maria Balsamo ◽  
Adriano Sfriso ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Coastal Waters ◽  
Abiotic Factors ◽  
Factors Affecting ◽  
Biotic And Abiotic Factors

scholarly journals Understanding the Spatial and Temporal Distribution and Environmental Characteristics of Polychaete Assemblages in the Coastal Waters of Ulleungdo, East Sea of Korea

2021 ◽  
Vol 9 (11) ◽  
pp. 1310
Author(s):  
Sang-Lyeol Kim ◽  
Ok-Hwan Yu
Keyword(s):  
Coastal Waters ◽  
Dominant Species ◽  
Environmental Changes ◽  
Temporal Distribution ◽  
Average Density ◽  
East Sea ◽  
Sediment Type ◽  
Spatial And Temporal Distribution ◽  
Factors Affecting ◽  
Study Results

The coastal area of Ulleungdo in the East Sea has experienced large climate and environmental changes. However, research on marine benthic animals in this area has been very limited. In the present study, we investigated the spatial and temporal distribution of benthic polychaetes to determine their seasonal adaptability to environmental changes in the coastal waters of Ulleungdo in 2019. In total, 116 species (34 families) of polychaetes were identified with an average of 25 species per site. The average density was 772.8 individuals m−2, with the highest density in August and the lowest in February. The dominant species were Pseudobranchiomma zebuensis (15.6%), Scolelepis sp. (8.6%), Haplosyllis spongiphila (7.3%), and Lumbrineris nipponica (6.3%). The main factors affecting polychaete community structure were water depth and sediment type (gravel, sand, silt, clay). Based on cluster analysis, the polychaetes tended to group mainly in winter and summer with P. zebuensis and Syllis sp. contributing to the grouping. The dominant species was the suspension feeder, which correlated highly with habitat sediment type and was substantially consistent with the coast of Dokdo. Some species overlapped in the East Sea coast, but the number and diversity of species were higher in Ulleungdo. Our study results confirm the ecological characteristics of benthic polychaetes of Ulleungdo and provide information for future monitoring of the environmental and biological changes in the East Sea.

Sign in / Sign up

Export Citation Format

Share Document