Morphological and Anatomical Differences among Three Seagrass Species in a High-energy Coastal Area Typically Dominated by Surfgrass in a Rocky Coastal Area of Shandong Peninsula, China

2020 ◽  
Vol 55 (2) ◽  
pp. 279-288
Author(s):  
Wen-Tao Li ◽  
Jia Song ◽  
Chongfeng Zhong ◽  
Xin Hou ◽  
Ran Cheng ◽  
...  
Keyword(s):  
Coastal Area ◽  
High Energy ◽  
Seagrass Species ◽  
Shandong Peninsula

SEAGRESS COVERAGE AND ECOSYSTEM CONDITION AT THE COASTAL AREA OF MADASANGER, JELENGA AND MALUK, WEST SUMBAWA

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Erny Poedjirahajoe ◽  
Ni Putu Diana Mahayani ◽  
Boy Rahardjo Sidharta ◽  
Muhamad Salamuddin
Keyword(s):  
Coastal Area ◽  
Seagrass Species ◽  
Seagrass Bed ◽  
Water Turbidity ◽  
Transect Sampling ◽  
Sampling Points ◽  
Ecosystem Condition ◽  
High Turbidity ◽  
Line Transects ◽  
Seagrass Coverage

The increase of temperature might affect the distribution and reproduction of seagrass. This research aims to determine the seagrass bed coverage and the ecosystem condition. Three line transects were established perpendicular to the coastal line with the distance of 50-100 m, or up to the border of the intertidal area. In each transect, sampling points were determined with a distance of 10-20 m. At the sampling points, a plot of 50 cm x 50 cm was established to measure the coverage percentage of seagrass vegetation. The seagrass species were also observed and recorded along the line transects. The percentage of seagrass coverage was measured using a method from Saito and Atobe (1994). The results showed that the coastal area of Jelenga has the highest percentage of seagrass coverage (>60%, healthy) among other coastal areas. This may be caused by the characteristic of Jelenga coast which was relatively calm, few visitors, low water turbidity, and high light penetration. While, other transects have percentage coverage of less than 60% (less healthy). There was one transect on Maluk coast which has coverage percentage of less than 29% (lack of seagrass species). The small coverage percentage on Maluk coast can be caused by the high number of visitors and high activity of fishing boats around the coast which results in high turbidity. Keywords: coverage, ecosystem condition, seagrass bed, west Sumbawa.

Research on the migration patterns of sea-land transitional zone in the coastal area of Longkou and Zhaoyuan

2018 ◽  
Vol 9 (2) ◽  
pp. 249-260 ◽  
Author(s):  
Changsuo Li ◽  
Chao Jia ◽  
Henghua Zhu ◽  
Weijiang Yu
Keyword(s):  
Transition Zone ◽  
Coastal Area ◽  
Groundwater Resources ◽  
Transitional Zone ◽  
Research Area ◽  
Field Pattern ◽  
Shandong Peninsula ◽  
Migration Patterns ◽  
Groundwater Levels ◽  
Economic Zone

Abstract Sea-level rise due to global warming and over-exploitation of groundwater resources in coastal areas will induce seawater intrusion into inland groundwater which is leading to the migration of the transition zone, and is affecting the security of regional social economy and water resources. Taking the blue economic zone of Shandong Peninsula as the research background, selecting the coastal area of Longkou and Zhaoyuan as the study area, this paper firstly depicts the groundwater flow field pattern in the research area, and then carries out the quantitative analysis for the migration patterns of the transition zone under changing groundwater levels. The results demonstrate that the width of sea-land transitional zone in the research area is about 1.5–4.5 km. The groundwater level is higher, the migration speed of the sea-land transitional zone is smaller. The results are of significance to study the migration of the sea-land transitional zone in the blue economic zone of Shandong peninsula.

scholarly journals A novel adaptation facilitates seed establishment under marine turbulent flows

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gary A. Kendrick ◽  
Andrew W. Pomeroy ◽  
Robert J. Orth ◽  
Marion L. Cambridge ◽  
Jeremy Shaw ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Turbulent Flows ◽  
High Energy ◽  
Ct Scans ◽  
Micro Ct ◽  
Seagrass Species ◽  
Australian Species ◽  
Drag And Lift ◽  
Membranous Wing ◽  
Marine Angiosperm

AbstractSeeds of Australian species of the seagrass genus Posidonia are covered by a membranous wing that we hypothesize plays a fundamental role in seed establishment in sandy, wave swept marine environments. Dimensions of the seed and membrane were quantified under electron microscopy and micro-CT scans, and used to model rotational, drag and lift forces. Seeds maintain contact with the seabed in the presence of strong turbulence: the larger the wing, the more stable the seed. Wing surface area increases from P. sinuosa < P. australis < P.coriacea correlating with their ability to establish in increasingly energetic environments. This unique seed trait in a marine angiosperm corresponds to adaptive pressures imposed on seagrass species along 7,500 km of Australia’s coastline, from open, high energy coasts to calmer environments in bays and estuaries.

Environmental magnetism evidence for longshore drift distribution of Fe-bearing phases: An example from the Brazilian southeastern coastal region

2021 ◽  
Vol 91 (11) ◽  
pp. 1133-1150
Author(s):  
Vitor E.P. Silveira ◽  
Natália B. dos Santos ◽  
Daniel R. Franco ◽  
Emanuele F. la Terra ◽  
Joshua M. Feinberg ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coastal Area ◽  
Rio De Janeiro ◽  
High Energy ◽  
Heavy Mineral ◽  
Heavy Minerals ◽  
Northern Coast ◽  
Mineral Distribution ◽  
Longshore Drift ◽  
Paraíba Do Sul River

ABSTRACT The accumulation of heavy minerals along a part of the southeastern Brazilian coast (northern coast of Rio de Janeiro State, Brazil) provides insight into sedimentary provenance and transport by longshore drift. In particular, recent work has focused on heavy minerals as tracers to determine sedimentary sources and transport pathways, indicating a mineral distribution according to the northward and southward coastal transport cells. There is also evidence of heavy-mineral transport by the Paraíba do Sul River. However, research has not been done in this area on the opaque fraction (iron oxides and oxyhydroxides), which are good tracers for provenance and distribution processes. Here we intend to: 1) characterize the spatial variation of the magnetic properties of heavy-mineral contents throughout a coastal area of the Itabapoana and Paraíba do Sul River mouths (state of Rio de Janeiro), 2) evaluate the contribution of coastal dynamics on the mineral distribution along this coastal area, 3) provide contributions on the provenance of iron-bearing minerals. Results indicate that a bimodal pattern was observed for the magnetic remanence of magnetite and hematite near the Paraíba do Sul River. For the northernmost section, goethite exhibits a gradual increase in concentration towards the central part of the study area. Additionally, higher heavy-mineral content is observed at the northern coastal section, which may be related to coastal morphology, which is exposed to high-energy beach processes. It is possible to verify three sampling groups in accordance with their magnetic properties: 1) the “southernmost” and 2) the “northernmost” groups, suggesting a mineral provenance related to the Paraíba do Sul and Itabapoana rivers, respectively, as possible major sources, and 3) another at the intermediate section of the area, possibly linked to the erosion of the Barreiras Formation bluffs. Results also show a correspondence between the variability of magnetic parameters and the main directions of the coastal transport cells.

scholarly journals The climate reconstruction in Shandong Peninsula, northern China, during the last millennium based on stalagmite laminae together with a comparison to <i>δ</i><sup>18</sup>O

2016 ◽  
Vol 12 (4) ◽  
pp. 871-881 ◽  
Author(s):  
Qing Wang ◽  
Houyun Zhou ◽  
Ke Cheng ◽  
Hong Chi ◽  
Chuan-Chou Shen ◽  
...  
Keyword(s):  
East Asia ◽  
Coastal Area ◽  
Northern China ◽  
Temperate Zone ◽  
Cold Climate ◽  
Shandong Peninsula ◽  
East Asia Monsoon ◽  
Monsoon Area ◽  
Warm Temperate Zone ◽  
Warm Temperate

Abstract. Stalagmite ky1, with a length of 75 mm and the upper part (from top to 42.769 mm depth) consisting of 678 laminae, was collected from Kaiyuan Cave in the coastal area of Shandong Peninsula, northern China, located in a warm temperate zone in the East Asia monsoon area. Based on high-precision dating with the U–230Th technique and continuous counting of laminae, the 1st and 678th laminae have been confirmed to be AD 1894 ± 20 and 1217 ± 20 from top to bottom, respectively. By the measurement of laminae thickness and δ18O ratios, we haved obtained the time series data of thickness of laminae and δ18O ratios from AD 1217 ± 20 to 1894 ± 20, analyzed the climatic–environmental meaning of variations in the thickness of laminae, which have a good correspondence with the cumulative departure curve of the drought–waterlog index in the historical period. The results show that, in the  ∼  678 years from AD 1217 ± 20 to 1894 ± 20, both the thickness of the laminae and the degree of fluctuation in the thickness of the laminae of stalagmite ky1 have obvious stages of variation and are completely synchronized with the contemporaneous intensity of the summer monsoons and precipitation as time changed. There is a negative correlation between the thickness of the laminae and the summer monsoon intensity and precipitation. There is a positive correlation between the degree of fluctuation in the thickness of the laminae and both the intensity of the summer monsoons and the precipitation. Therefore, for the Kaiyuan Cave in the coastal area of both the warm temperate zone and the East Asia monsoon area, the variations in the thickness of the laminae are not only related to the change in the climatic factors themselves but also related to the degree of climatic stability. In the coastal area belonging to the warm temperate zone and the East Asia monsoon area, the climate change between the LIA (Little Ice Age) and the MWP (Medieval Warm Period), in addition to less precipitation and low temperatures (a type of dry and cold climate), also shows an obviously decreasing trend in the degree of climatic stability.

scholarly journals SEAGRESS COVERAGE AND ECOSYSTEM CONDITION AT THE COASTAL AREA OF MADASANGER, JELENGA AND MALUK, WEST SUMBAWA

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Erny Poedjirahajoe ◽  
Ni Putu Diana Mahayani ◽  
Boy Rahardjo Sidharta ◽  
Muhamad Salamuddin
Keyword(s):  
Coastal Area ◽  
Seagrass Species ◽  
Seagrass Bed ◽  
Water Turbidity ◽  
Transect Sampling ◽  
Sampling Points ◽  
Ecosystem Condition ◽  
High Turbidity ◽  
Line Transects ◽  
Seagrass Coverage

<p>The increase of temperature might affect the distribution and reproduction of seagrass. This research aims to determine the seagrass bed coverage and the ecosystem condition. Three line transects were established perpendicular to the coastal line with the distance of 50-100 m, or up to the border of the intertidal area. In each transect, sampling points were determined with a distance of 10-20 m. At the sampling points, a plot of 50 cm<span style="text-decoration: underline;"> </span>x 50 cm was established to measure the coverage percentage of seagrass vegetation. The seagrass species were also observed and recorded along the line transects. The percentage of seagrass coverage was measured using a method from Saito and Atobe (1994). The results showed that the coastal area of Jelenga has the highest percentage of seagrass coverage (&gt;60%, healthy) among other coastal areas. This may be caused by the characteristic of Jelenga coast which was relatively calm, few visitors, low water turbidity, and high light penetration. While, other transects have percentage coverage of less than 60% (less healthy). There was one transect on Maluk coast which has coverage percentage of less than 29% (lack of seagrass species). The small coverage percentage on Maluk coast can be caused by the high number of visitors and high activity of fishing boats around the coast which results in high turbidity.</p> <p>Keywords: coverage, ecosystem condition, seagrass bed, west Sumbawa.</p>

scholarly journals PREDICTION OF STORM SURGE INTENSITY IN COASTAL DISASTER EVALUATION

2011 ◽  
Vol 1 (32) ◽  
pp. 20
Author(s):  
Sheng Dong ◽  
Qiaoling Ji
Keyword(s):  
Storm Surge ◽  
Coastal Area ◽  
Disaster Mitigation ◽  
Logistic Distribution ◽  
Practical Case ◽  
Tidal Level ◽  
Shandong Peninsula ◽  
Probability Concept ◽  
Wave Heights ◽  
New Criterion

In coastal area, serious storm surge disasters are frequently caused by the higher tidal level and concomitant huge wave heights toward shoreline. Qingdao is located at the southern tip of Shandong Peninsula of China. The storm surge disaster in Qingdao depends on various influencing factors such as the intensity, duration, and route of the passing typhoon. In order to make up the defects of the warning water level, a Poisson Bi-variable Gumbel Logistic Distribution is presented to predict storm surge intensity. On the basis of observed records of tidal level and simultaneously occurred wave height series that are sampled from typhoon processes in Qingdao coastal area of China since 1949, the return periods of typhoon surge are estimated by this model. Then a new criterion is put forward to classify intensity grade of disaster-induced typhoon surges. A practical case indicates that the new criterion is clear in probability concept, easy to operate, and fits the calculation of typhoon surge intensity. Thus the procedure with the proposed statistical model will be a reference for the disaster mitigation in the other coastal area influenced by typhoons.

Characteristics of Suspended Sediment and Resuspension Process in Wendeng Coastal Area, Shandong Peninsula

2013 ◽  
Vol 807-809 ◽  
pp. 1595-1599 ◽  
Author(s):  
Xiao Liu ◽  
Xiu Li Feng ◽  
Jie Liu
Keyword(s):  
Suspended Sediment ◽  
Coastal Area ◽  
Tidal Cycle ◽  
Suspended Sediment Concentration ◽  
Sediment Resuspension ◽  
Analysis Data ◽  
Sediment Concentration ◽  
Velocity Variation ◽  
Shandong Peninsula ◽  
Maximum Value

Based on the field observations and laboratory analysis data of the suspended sediment of Wendeng coastal area, this paper studied the change process of suspended sediment concentration and characteristics of surface sediment resuspension in the study area. In results: (1) In vertical, the suspended sediment concentration of each station increased gradually from surface to bottom, and the maximum value could reach 0.11 kg/m3; (2) Suspended sediment concentration is well correlated with velocity variation in a tidal cycle, and the peak of suspended sediment concentration occurs four times in a tidal cycle, indicating that there are four resuspension processes during a tidal cycle in the study area; (3) According to the suspended sediment concentration at different times and the content of the previous time, the maximum settlement is between 0.063~0.092kg/m3, and the maximum resuspension is between 0.057~0.125kg/m3 in the study area.

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